EX-99 2 eks4_082007.htm EX 99.1 Crystal Report Viewer
  
 
Statement to Certificateholder
 
Distribution Information Deal Information
 
1. Distribution Summary Deal Name: Residential Asset Securities Corp, 2007-KS4
 
2. Factor Summary Asset Type: Home Equity Mortgage Asset Backed Pass-Through
Certificates
3. Components Information (Not Applicable)
Closing Date: 04/27/2007
4. Interest Summary
First Distribution Date: 05/25/2007
5. Other Income Detail
Determination Date: 08/20/2007
6. Interest Shortfalls, Compensation and Expenses Distribution Date: 08/27/2007
Record Date:
7. Prepayment Interest and Basis Risk/Net WAC Shortfall Amounts
Book-Entry: 08/24/2007
8. Collateral Summary Definitive: 07/31/2007
 
9. Repurchase Information
 
10. Loan Status Report (Delinquencies)
Trustee: Lasalle Bank, Na.
11. Deal Delinquencies (30 Day Buckets)
Main Telephone: 312-904-6709
12. Loss Mitigation and Servicing Modifications
GMAC-RFC
13. Losses and Recoveries
Bond Administrator: Perry Bons
14. Credit Enhancement Report
Telephone: 818-260-1441
15. Distribution Percentages (Not Applicable)
Pool(s) : 40522,40523
16. Overcollateralization Summary
17. Excess Cash Flow, Overcollateralization
Provisions and Derivative Amounts
 
18. Performance Tests
 
19. Lender Paid Mortgage Insurance (Not Applicable)
 
20. Comments
 
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 1 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
1. Distribution Summary
 
Class CUSIP Original Face
Value
 Beginning
Notional /
Principal
Balance
 Pass -
Through
Rate
 Principal
Distribution
 Interest
Distribution
 Total
Distribution
(3) + (4) = (5)
 Principal Loss Interest
Loss
 Deferred
Interest
 Ending Notional/
Principal Balance
(1)-(3)-(6)+(8)=(9)
 
(1) (2) (3) (4) (5) (6) (7) (8) (9)
 
A-1 74924NAA5 103,900,000.00 98,961,707.53 5.42000000 2,421,388.73 491,674.75 2,913,063.48 0.00 0.00 0.00 96,540,318.80
 
A-2 74924NAB3 29,400,000.00 29,400,000.00 5.50000000 0.00 148,225.00 148,225.00 0.00 0.00 0.00 29,400,000.00
 
A-3 74924NAC1 34,300,000.00 34,300,000.00 5.59000000 0.00 175,758.92 175,758.92 0.00 0.00 0.00 34,300,000.00
 
A-4 74924NAD9 15,275,000.00 15,275,000.00 5.66000000 0.00 79,251.79 79,251.79 0.00 0.00 0.00 15,275,000.00
 
M-1S 74924NAE7 11,250,000.00 11,250,000.00 5.68000000 0.00 58,575.00 58,575.00 0.00 0.00 0.00 11,250,000.00
 
M-2S 74924NAF4 11,625,000.00 11,625,000.00 5.82000000 0.00 62,019.38 62,019.38 0.00 0.00 0.00 11,625,000.00
 
M-3S 74924NAG2 4,500,000.00 4,500,000.00 5.97000000 0.00 24,626.25 24,626.25 0.00 0.00 0.00 4,500,000.00
 
M-4 74924NAH0 5,625,000.00 5,625,000.00 6.47000000 0.00 33,360.94 33,360.94 0.00 0.00 0.00 5,625,000.00
 
M-5 74924NAJ6 4,875,000.00 4,875,000.00 6.72000000 0.00 30,030.00 30,030.00 0.00 0.00 0.00 4,875,000.00
 
M-6 74924NAK3 3,500,000.00 3,500,000.00 7.07000000 0.00 22,682.92 22,682.92 0.00 0.00 0.00 3,500,000.00
 
M-7 74924NAL1 4,875,000.00 4,875,000.00 7.56360044 0.00 34,945.63 34,945.63 0.00 0.00 0.00 4,875,000.00
 
M-8 74924NAM9 2,875,000.00 2,875,000.00 7.56360044 0.00 20,608.96 20,608.96 0.00 0.00 0.00 2,875,000.00
 
M-9 74924NAN7 3,875,000.00 3,875,000.00 7.56360044 0.00 27,777.29 27,777.29 0.00 0.00 0.00 3,875,000.00
 
SB 74924NAP2 14,126,575.58 14,125,089.02 0.00000000 0.00 569,000.00 569,000.00 0.00 0.00 0.00 14,125,089.02
 
R 0.00 0.00 0.00000000 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 
Deal Totals 250,001,575.58 245,061,796.55 2,421,388.73 1,778,536.83 4,199,925.56 0.00 0.00 0.00 242,640,407.82
 
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 2 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
2. Factor Summary
Amount /Original Amount per $1000 unit)
 
Class CUSIP Beginning Notional/
Principal Balance
Factor
 Principal
Distribution
Factor
 Interest Distribution
Factor
 Total Distribution
Factor
 Deferred
Interest
Factor
 Interest Shortfall
Factor
 Ending Notional/
Principal Balance
Factor
A-1 74924NAA5 952.47071732 23.30499259 4.73219201 28.03718460 0.00000000 0.00000000 929.16572474
A-2 74924NAB3 1,000.00000000 0.00000000 5.04166667 5.04166667 0.00000000 0.00000000 1,000.00000000
A-3 74924NAC1 1,000.00000000 0.00000000 5.12416676 5.12416676 0.00000000 0.00000000 1,000.00000000
A-4 74924NAD9 1,000.00000000 0.00000000 5.18833322 5.18833322 0.00000000 0.00000000 1,000.00000000
M-1S 74924NAE7 1,000.00000000 0.00000000 5.20666667 5.20666667 0.00000000 0.00000000 1,000.00000000
M-2S 74924NAF4 1,000.00000000 0.00000000 5.33500043 5.33500043 0.00000000 0.00000000 1,000.00000000
M-3S 74924NAG2 1,000.00000000 0.00000000 5.47250000 5.47250000 0.00000000 0.00000000 1,000.00000000
M-4 74924NAH0 1,000.00000000 0.00000000 5.93083378 5.93083378 0.00000000 0.00000000 1,000.00000000
M-5 74924NAJ6 1,000.00000000 0.00000000 6.16000000 6.16000000 0.00000000 0.00000000 1,000.00000000
M-6 74924NAK3 1,000.00000000 0.00000000 6.48083429 6.48083429 0.00000000 0.00000000 1,000.00000000
M-7 74924NAL1 1,000.00000000 0.00000000 7.16833436 7.16833436 0.00000000 0.00000000 1,000.00000000
M-8 74924NAM9 1,000.00000000 0.00000000 7.16833391 7.16833391 0.00000000 0.00000000 1,000.00000000
M-9 74924NAN7 1,000.00000000 0.00000000 7.16833290 7.16833290 0.00000000 0.00000000 1,000.00000000
SB 1 74924NAP2
R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
1 Factors not reported for OC Classes
  
 
 
Deal Factor : 97.05555145%
 
Group I-FIXED Factor : 97.42384899%
 
Group I-ARM Factor : 96.91741486%
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 3 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
4. Interest Summary
The following section only reports information for classes that have accrued interest for this distribution.
 
Class Accrual Period Accrual
Methodology
 Beginning
Notional/Principal
Balance
 Pass-
Through
Rate
 Optimal
Interest
 Interest
Loss
 Deferred
Interest
 Interest
Shortfall
Amount
 Other
Income
 Interest
Distribution
(1)-(2)-(3)-
(4)+(5)=(6)
 Accrued
Certificate
Interest
Remaining
Unpaid
 
Start End (1) (2) (3) (4) (5) (6)
A-1 07/25/2007 08/26/2007 Actual/360 98,961,707.53 5.42000000 491,674.75 0.00 0.00 0.00 0.00 491,674.75 0.00
A-2 07/25/2007 08/26/2007 Actual/360 29,400,000.00 5.50000000 148,225.00 0.00 0.00 0.00 0.00 148,225.00 0.00
A-3 07/25/2007 08/26/2007 Actual/360 34,300,000.00 5.59000000 175,758.92 0.00 0.00 0.00 0.00 175,758.92 0.00
A-4 07/25/2007 08/26/2007 Actual/360 15,275,000.00 5.66000000 79,251.79 0.00 0.00 0.00 0.00 79,251.79 0.00
M-1S 07/25/2007 08/26/2007 Actual/360 11,250,000.00 5.68000000 58,575.00 0.00 0.00 0.00 0.00 58,575.00 0.00
M-2S 07/25/2007 08/26/2007 Actual/360 11,625,000.00 5.82000000 62,019.38 0.00 0.00 0.00 0.00 62,019.38 0.00
M-3S 07/25/2007 08/26/2007 Actual/360 4,500,000.00 5.97000000 24,626.25 0.00 0.00 0.00 0.00 24,626.25 0.00
M-4 07/25/2007 08/26/2007 Actual/360 5,625,000.00 6.47000000 33,360.94 0.00 0.00 0.00 0.00 33,360.94 0.00
M-5 07/25/2007 08/26/2007 Actual/360 4,875,000.00 6.72000000 30,030.00 0.00 0.00 0.00 0.00 30,030.00 0.00
M-6 07/25/2007 08/26/2007 Actual/360 3,500,000.00 7.07000000 22,682.92 0.00 0.00 0.00 0.00 22,682.92 0.00
M-7 07/25/2007 08/26/2007 Actual/360 4,875,000.00 7.56360044 34,945.63 0.00 0.00 0.00 0.00 34,945.63 0.00
M-8 07/25/2007 08/26/2007 Actual/360 2,875,000.00 7.56360044 20,608.96 0.00 0.00 0.00 0.00 20,608.96 0.00
M-9 07/25/2007 08/26/2007 Actual/360 3,875,000.00 7.56360044 27,777.29 0.00 0.00 0.00 0.00 27,777.29 0.00
SB 07/01/2007 07/31/2007 Actual/360 14,125,089.02 0.00000000 0.00 0.00 0.00 0.00 569,000.00 569,000.00 0.00
Deal Totals 245,061,796.55 1,209,536.83 0.00 0.00 0.00 569,000.00 1,778,536.83 0.00
 
 
 
Current Index Rates
 
Index Type Rate Classes
 
 
LBTEL-SBD 25 -2BD 5.32000000 A-1, A-2, A-3, M-1S, M-3S, M-5, M-7, M-9, M-8, M-6, M-4, M-2S, A-4
 
 
5. Other Income Detail
 
Class Prepayment Charges Remaining Excess Cash Flow
and OC Release Amount
 Other Income Distribution
 
(1) (2) (1) + (2) = (3)
SB
32,529.67 536,470.33 569,000.00
 
Deal Totals 32,529.67 536,470.33 569,000.00
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 4 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
6. Interest Shortfalls, Compensation and Expenses
 
Current
Prepayment
Interest Shortfall
Amount
 Compensating
Interest
 Net Prepayment
Interest Shortfall
Amount
(1) - (2)=(3)
 Civil Relief
Act
 Civil Relief
Act
 Compensation Advances Allowable
Expenses per
Non -
Recoverable
Advances
(1) (2) (3) Subservicer Master Subservicer Master
Group I-ARM 9,770.59 9,770.59 0.00 0 0.00 66,308.45 0.00 140,450.57 0.00 0.00 0.00
Group I-FIXED 987.23 987.23 0.00 0 0.00 24,965.88 1,844.47 41,233.88 0.00 0.00 0.00
Deal Totals 10,757.82 10,757.82 0.00 0 0.00 91,274.33 1,844.47 181,684.45 0.00 0.00 0.00
 
 
 
7. Prepayment Interest and Basis Risk/Net WAC Shortfall Amounts
 
(A) Prepayment Interest Shortfall Amounts (B) Basis Risk/Net WAC Shortfall Amounts
 
Class Current Prior Unpaid Prior Unpaid
Accrued Interest
 Total Paid Remaining Unpaid
(1)+(2)+(3)-(4)=(5)
 Current Period
Uncompensated
 Prior Unpaid Prior Unpaid
Accrued
Interest
 Total
Paid
 Remaining Unpaid
(1)+(2)+(3)-(4)=(5)
 
(1) (2) (3) (4) (5) (1) (2) (3) (4) (5)
 
A-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
A-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
A-3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
A-4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-1S 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-2S 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-3S 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-4 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
M-7 0.00 0.00 0.00 0.00 0.00 1,145.79 0.00 0.00 1,145.79 0.00
M-8 0.00 0.00 0.00 0.00 0.00 675.72 0.00 0.00 675.72 0.00
M-9 0.00 0.00 0.00 0.00 0.00 910.75 0.00 0.00 910.75 0.00
SB 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
R 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 
Deal Totals 0.00 0.00 0.00 0.00 0.00 2,732.26 0.00 0.00 2,732.26 0.00
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 5 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
 
8. Collateral Summary
 
A. Loan Count and Balances
 
Original
Loan Count/
Scheduled
Principal
Balance
 Beginning
Loan Count/
Scheduled
Principal
Balance
 Scheduled
Principal
 Curtailments Payoffs Matured
Loans
 Repurchases Beginning Aggregate
Scheduled
Principal Balance
of Liquidations/
Charge-offs
 Ending Loan
Count/Scheduled
Principal Balance
 
Count 954 940 N/A 85 11 0 0 0 929
Group I-ARM
Balance/Amount 181,810,345.15 178,382,972.87 68,515.37 8,981.59 2,099,589.45 N/A 0.00 0.00 176,205,886.46
 
Count 656 644 N/A 85 3 0 0 0 641
Group I-FIXED
Balance/Amount 68,191,230.43 66,678,823.68 40,128.22 7,035.36 197,138.74 N/A 0.00 0.00 66,434,521.36
 
Deal Totals Count 1,610 1,584 N/A 170 14 0 0 0 1,570
Balance/Amount 250,001,575.58 245,061,796.55 108,643.59 16,016.95 2,296,728.19 N/A 0.00 0.00 242,640,407.82
 
 
B. Weighted Averages
 
Beginning
Weighted
Average
Gross
Mortgage
Rate
 Ending
Weighted
Average
Gross
Mortgage
Rate
 Ending
Weighted
Average
Remaining
Amortization
Term
 Ending
Weighted
Average
Months to
Maturity
 Beginning
Weighted
Average
Net
Mortgage
 Ending
Weighted
Average
Net
Mortgage
 Beginning
Weighted
Average
Unmodified
Net
Mortgage
 Net
Weighted
Average
Cap Rate
 Weighted
Average
Net Rate
Group I-ARM
8.64965461 8.65146981 379.93 352.82 8.14991116 8.15172950 8.14991116 7.56360044 8.31996048
Group I-FIXED
9.27488606 9.27080589 356.18 339.80 8.77488606 8.77080589 8.77488606 7.56360044 8.31996048
Deal Totals
8.81977373 8.82104295 373.42 349.26 8.31996048 8.32123154 8.31996048 N/A N/A
 
C. Constant Prepayment Rate
 
1 Month CPR 3 Month CPR 6 Month CPR 12 Month CPR Life CPR
 
 
I-FIXED 3.62% 6.37% 6.87%
 
I-ARM 13.30% 11.22% 8.55%
 
Deal Totals 10.76% 9.92% 8.10%
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 6 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
 
9. Repurchases
 
Breaches Of
Representations
 ARM Conversions Optional
Repurchases of
Defaulted Loans
 Others Total
(1)+(2)+(3)+(4)=(5)
(1) (2) (3) (4) (5)
Count 0 0 0 0
0
Group I-ARM
Scheduled Balance 0.00 0.00 0.00 0.00 0.00
Count 0 0 0 0
0
Group I-FIXED
Scheduled Balance 0.00 0.00 0.00 0.00 0.00
 
Count 0 0 0 0 0
Deal Totals
Scheduled Balance 0.00 0.00 0.00 0.00 0.00
 
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 7 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
10. Loan Status Report
Delinquency Calculation Method: Office of Thrift Supervision
Current / Delinquent Bankruptcy Foreclosure REO Total
Deal
Totals
Count Scheduled Balance Count Scheduled Balance Count Scheduled Balance Count Scheduled Balance Actual Balance Count Scheduled Balance
Current 1,436 219,256,422.28 1 110,775.82 0 0.00 0 0.00 0.00 1,437 219,367,198.10
30 days 56 10,873,573.81 0 0.00 0 0.00 0 0.00 0.00 56 10,873,573.81
60 days 33 5,340,702.00 0 0.00 0 0.00 0 0.00 0.00 33 5,340,702.00
90 days 28 3,497,784.58 2 275,194.40 14 3,285,954.93 0 0.00 0.00 44 7,058,933.91
120 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
150 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
180 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
181+ days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
Total 1,553 238,968,482.67 3 385,970.22 14 3,285,954.93 0 0.00 0.00 1,570 242,640,407.82
 
Current 91.46% 90.36% 0.06% 0.05% 0.00% 0.00% 0.00% 0.00% 0.00% 91.53% 90.41%
30 days 3.57% 4.48% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 3.57% 4.48%
60 days 2.10% 2.20% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 2.10% 2.20%
90 days 1.78% 1.44% 0.13% 0.11% 0.89% 1.35% 0.00% 0.00% 0.00% 2.80% 2.91%
120 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
150 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
180 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
181+ days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Total 98.92% 98.49% 0.19% 0.16% 0.89% 1.35% 0.00% 0.00% 0.00% 100.00% 100.00%
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 8 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
Current / Delinquent Bankruptcy Foreclosure REO Total
Group  
Count Scheduled Balance Count Scheduled Balance Count Scheduled Balance Count Scheduled Balance Actual Balance Count Scheduled Balance
 
Current 837 157,564,246.50 1 110,775.82 0 0.00 0 0.00 0.00 838 157,675,022.32
30 days 38 8,350,066.37 0 0.00 0 0.00 0 0.00 0.00 38 8,350,066.37
60 days 27 4,655,544.98 0 0.00 0 0.00 0 0.00 0.00 27 4,655,544.98
90 days 12 2,430,310.26 2 275,194.40 12 2,819,748.13 0 0.00 0.00 26 5,525,252.79
120 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
150 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
180 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
181+ days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
Total 914 173,000,168.11 3 385,970.22 12 2,819,748.13 0 0.00 0.00 929 176,205,886.46
 
Current 90.10% 89.42% 0.11% 0.06% 0.00% 0.00% 0.00% 0.00% 0.00% 90.20% 89.48%
30 days 4.09% 4.74% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 4.09% 4.74%
60 days 2.91% 2.64% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 2.91% 2.64%
90 days 1.29% 1.38% 0.22% 0.16% 1.29% 1.60% 0.00% 0.00% 0.00% 2.80% 3.14%
120 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
150 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
180 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
181+ days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Total 98.39% 98.18% 0.32% 0.22% 1.29% 1.60% 0.00% 0.00% 0.00% 100.00% 100.00%
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 9 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
Current / Delinquent Bankruptcy Foreclosure REO Total
Group  
Count Scheduled Balance Count Scheduled Balance Count Scheduled Balance Count Scheduled Balance Actual Balance Count Scheduled Balance
 
Current 599 61,692,175.78 0 0.00 0 0.00 0 0.00 0.00 599 61,692,175.78
30 days 18 2,523,507.44 0 0.00 0 0.00 0 0.00 0.00 18 2,523,507.44
60 days 6 685,157.02 0 0.00 0 0.00 0 0.00 0.00 6 685,157.02
90 days 16 1,067,474.32 0 0.00 2 466,206.80 0 0.00 0.00 18 1,533,681.12
120 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
150 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
180 days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
181+ days 0 0.00 0 0.00 0 0.00 0 0.00 0.00 0 0.00
Total 639 65,968,314.56 0 0.00 2 466,206.80 0 0.00 0.00 641 66,434,521.36
 
Current 93.45% 92.86% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 93.45% 92.86%
30 days 2.81% 3.80% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 2.81% 3.80%
60 days 0.94% 1.03% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.94% 1.03%
90 days 2.50% 1.61% 0.00% 0.00% 0.31% 0.70% 0.00% 0.00% 0.00% 2.81% 2.31%
120 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
150 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
180 days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
181+ days 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
Total 99.69% 99.30% 0.00% 0.00% 0.31% 0.70% 0.00% 0.00% 0.00% 100.00% 100.00%
 
  
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 10 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
11. Delinquency Data
 
Totals Totals Totals Totals Totals
Count
% Count
 Balance
% Balance
 Count
% Count
 Balance
% Balance
 Count
% Count
 Balance
% Balance
 Count
% Count
 Balance
% Balance
 Count
% Count
 Balance
% Balance
 
56 10,873,573.81 0 0.00 0 0.00 0 0.00 0 0.00
1 Month 13 Months 25 Months 37 Months 49 Months
3.57% 4.48% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
33 5,340,702.00 0 0.00 0 0.00 0 0.00 0 0.00
2 Months 14 Months 26 Months 38 Months 50 Months
2.10% 2.20% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
44 7,058,933.91 0 0.00 0 0.00 0 0.00 0 0.00
3 Months 15 Months 27 Months 39 Months 51 Months
2.80% 2.91% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
4 Months 16 Months 28 Months 40 Months 52 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
5 Months 17 Months 29 Months 41 Months 53 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
6 Months 18 Months 30 Months 42 Months 54 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
7 Months 19 Months 31 Months 43 Months 55 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
0 0.00
0 0.00 0 0.00 0 0.00 0 0.00
8 Months 20 Months 32 Months 44 Months 56 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
9 Months 21 Months 33 Months 45 Months 57 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
10 Months 22 Months 34 Months 46 Months 58 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
0.00 0.00
0 0.00 0 0.00 0 0 0 0.00
11 Months 23 Months 35 Months 47 Months 59 Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
12 Months 24 Months 36 Months 48 Months 60+ Months
0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
 
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 11 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
12. Loss Mitigation and Servicing Modifications
 
 
Current 1 Payment 2 Payments 3+ Payments Foreclosure REO Total
 
Modification Type Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 
Group   Capitalizations 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Other Modifications 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
 
 
Group   Capitalizations 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Other Modifications 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
 
 
Capitalizations 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Deal
Totals
Other
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
 
 
 
Payoffs Repurchases Liquidations Total
 
Current Month Cumulative Current Month Cumulative Current Month Cumulative Current Month Cumulative
Modification Type
Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 Count Scheduled
Balance
 
Group   Capitalizations 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Other Modifications 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
 
 
Group   Capitalizations 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Other Modifications 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
 
 
Deal
Totals
 Capitalizations 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
Other
Modifications
0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00 0 0.00
 
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 12 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
13. Losses and Recoveries
A. Current Cycle Realized Losses
 
Current Period Realized Losses Liquidations Charge-Offs Servicing Modifications Bankruptcy Losses Total
 
Loss Count 0 0 0 0 0
 
Group   Beginning Aggregate Scheduled Balance 0.00 0.00 0.00 0.00 0
Principal Portion of Loss 0.00 0.00 0.00 0.00 0.00
 
Interest Portion of Loss 0.00 0.00 0.00 0.00 0.00
 
Total Realized Loss 0.00 0.00 0.00 0.00 0.00
 
Loss Count 0 0 0 0 0
 
Group   Beginning Aggregate Scheduled Balance 0.00 0.00 0.00 0.00 0
Principal Portion of Loss 0.00 0.00 0.00 0.00 0.00
 
Interest Portion of Loss 0.00 0.00 0.00 0.00 0.00
 
Total Realized Loss 0.00 0.00 0.00 0.00 0.00
 
Loss Count 0 0 0 0 0
 
Beginning Aggregate Scheduled Balance 0.00 0.00 0.00 0.00 0.00
Deal
Totals
Principal Portion of Loss 0.00 0.00 0.00 0.00 0.00
 
Interest Portion of Loss 0.00 0.00 0.00 0.00 0.00
 
Total Realized Loss 0.00 0.00 0.00 0.00 0.00
 
B. Cumulative Realized Losses
 
Cumulative Realized Losses Liquidations Charge-Offs Servicing Modifications Bankruptcy Losses Total
 
 
Group   Loss Count 0 0 0 0 0
Total Realized Loss 0.00 0.00 0.00 0.00 0.00
 
Group   Loss Count 0 0 0 0 0
Total Realized Loss 0.00 0.00 0.00 0.00 0.00
 
Deal
Totals
 Loss Count 0 0 0 0 0
Total Realized Loss 0.00 0.00 0.00 0.00 0.00
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 13 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
C. Subsequent Recoveries
 
Subsequent Recoveries Current Period Cumulative
 
 
Subsequent Recoveries Count 0 0
Group  
Subsequent Recoveries 0.00 0.00
Net Loss 1 0.00 0.00
 
Net Loss % 2 0.00% 0.00%
 
Subsequent Recoveries Count 0 0
Group  
Subsequent Recoveries 0.00 0.00
Net Loss 1 0.00 0.00
 
Net Loss % 2 0.00% 0.00%
 
Subsequent Recoveries Count 0 0
 
Subsequent Recoveries 0.00 0.00
Deal
Totals
Net Loss 1 0.00 0.00
 
Net Loss % 2 0.00% 0.00%
1 Total Realized Loss less Subsequent Recoveries
2 Net Loss % of Original Balance
 
 
 
D. Default Percentages
 
Default Loss Percentage 1 Month 3 Months 6 Months 12 Months Life of Deal
 
Group Monthly Default Rate 0.00% 0.00% 0.00%
I-FIXED Constant Default Rate 0.00% 0.00% 0.00%
 
Group Monthly Default Rate 0.00% 0.00% 0.00%
I-ARM Constant Default Rate 0.00% 0.00% 0.00%
 
Monthly Default Rate 0.00% 0.00% 0.00%
Deal Totals Constant Default Rate 0.00% 0.00% 0.00%
 
1-Month MDR (Current Month) = SUM(Beginning Scheduled balances of liquidating loans) / [SUM(Beginning Scheduled loan balances)- SUM(Scheduled Principal payments)]
m-Month = 3, 6, 12, months or the life of deal to date
m-Month MDR(over m months in period where n is current month)= 1-[(1-MDRn-m+1) * (1-MDRn-m+2) *.* (1-MDR n-1) * (1-MDRn)]^(1/m)
CDRm = 1- [(1- MDRm)^12],where m is number of months in period
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 14 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
 
 
14. Credit Enhancement Report
 
Reserve Accounts
DEPOSITS WITHDRAWALS
Ending
Balance
Description Source Beginning
Balance
 Investment
Earnings
 Other
Deposits
 Draws Releases
 
Supplemental Interest Trust Acct 0.00 0.00 46,920.09 46,920.09 0.00 0.00
 
Hedge Agreements
 
Description Provider Termination
Date
 Amount Received From Provider Amount Paid to Provider
 
Swap Agreement Bear, Stearns & Co., Inc. 04/25/2011 1,089,588.76 1,042,668.67
 
 
 
16. Overcollateralization Summary
 
Prior Required
Overcollateralization
Amount
 Beginning
Overcollateralization
Amount
 Overcollateralization
Increase/(Reduction)
Amount
 Ending
Overcollateralization
Amount
 Current Required
Overcollateralization
Amount
Deal Total
14,125,089.02 14,125,089.02 0.00 14,125,089.02 14,125,089.02
 
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 15 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
17. Excess Cashflow, Overcollateralization and Derivative Amounts
 
Excess Cashflow and Derivative Summary
 
(1) Scheduled Unmodified Net Interest 1,699,087.05
 
(2) Interest Losses 0.00
 
(3) Subsequent Recoveries 0.00
 
(4) Interest Adjustment Amount 0.00
 
(5) Swap Payment Amount - OUT 0.00
 
(6) Swap Payment Amount - IN 46,920.09
 
(7) Certificate Interest Amount 1,206,804.55
 
(8) OC Reduction Amount 0.00
 
(9) Excess Cashflow Prior to OC Provisions 539,202.59
 
Overcollateralization and Derivative Amounts
 
Excess Cashflow Prior to OC Provisions 539,202.59
 
(1) Unreimbursed Principal Portion of Realized Losses 0.00
 
(2) Principal Portion of Realized Losses 0.00
 
(3) Overcollateralization Increase 0.00
 
(4) Prepayment Interest Shortfall 0.00
 
(5) Unpaid PPIS With Accrued Interest 0.00
 
(6) Basis Risk Shortfall Carry-Forward Amount 2,732.26
 
(7) Relief Act Shortfall 0.00
 
(8) Unreimbursed Realized Losses 0.00
 
(9) Swap Termination Payment Amount 0.00
 
(10) To Class SB Certificates 536,470.33
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 16 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
18. Performance Tests
 
 
Senior Balance Test
 
Senior Certificate Beginning Balance - Actual Value 177,936,707.53
 
Zero Balance 0.00
 
Senior Certificate Beginning Balance = 0.00 False
 
Current Distribution Date >= Target Distribution
 
Current Distribution Period 4
 
StepDownTarget Distribution Period 37
 
Current Distribution Date >= Target Distribution Date False
 
Stepdown Date - Senior Enhancement Test
 
Current Senior Enhancement Percent - Actual value 27.66443100%
 
Specified Senior Enhancement Percent - Target value 53.70000000%
 
Senior Enhance Pct >= Specified Senior Enhance Pct (Actual End Balance <= Target End Balance) False
 
StepDown Date and Senior Enhancement pass
 
Current Distribution Date >= Target Distribution Date False
 
Senior Enhance Pct >= Specified Senior Enhance Pct (Actual End Balance <= Target End Balance) False
 
After StepDown Date and Senior Enh Percent >= Target Percent False
 
StepDown Date has occured
 
Senior Certificate Beginning Balance = 0.00 False
 
After StepDown Date and Senior Enh Percent >= Target Percent False
 
Stepdown Date has occurred False
 
Sixty-Plus Delinquency Percentage >= Target %
 
3-Month Average Sixty-Plus Delinquency Percentage - Actual Value 2.67795100%
 
Senior Enhancement Delinquency Percentage - Target Value 8.24400100%
 
Sixty-Plus Delinquency Percentage >= Senior Enhancement Delinquency Percentage Target False
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 17 of 18


  
 
Statement to Certificateholder
Residential Asset Securities Corp, 2007-KS4
August 27, 2007
 
Trigger Event clause (b) - Realized Loss Test
 
Aggregate Realized Loss Percentage - Actual Value 0.00000000%
 
Scheduled Loss Target Percent 99,999.00000000%
 
Aggregate Realized Loss Percentage >= Scheduled Loss Percent False
 
Trigger Event is in effect?
 
Sixty-Plus Delinquency Percentage >= Senior Enhancement Delinquency Percentage Target False
 
Aggregate Realized Loss Percentage >= Scheduled Loss Percent False
 
Trigger Event is in effect False
 
Stepdown Date and Trigger Event in effect
 
Stepdown Date has occurred False
 
Trigger Event is in effect False
 
Trigger Event is in effect on or after StepDown Date False
 
 
20. Comments
 
ERISA Text: Each beneficial owner of any Certificate (or any interest therein) which provides credit enhancement for any other Certificate and is available in book-entry form, including any such
Class M Certificate, shall be deemed to have represented, by virtue of its acquisition or holding of such Certificate (or interest therein), that either: a) it is not an employee benefit
or other plan subject to the prohibited transaction provision of the Employee Retirement Income Security Act of 1974, as amended('ERISA'), or Section 4975 of the Internal Revenue
Code of 1986, as amended (a 'Plan'), or any other person (including an investment manager, a named fiduciary or a trustee of any Plan) acting, directly or indirectly, on behalf of
purchasing any Certificate with 'plan assets' of any Plan; or b) (i) the transferee is an insurance company, (ii) the source of funds to be used by it to purchase the Certificates is an
'insurance company general account' (within the meaning of Department of Labor Prohibited Transaction Class Exemption ('PTCE') 95-60), and (iii) the conditions set forth in
Section I and III of PTCE 95-60 have been satisfied. Any purported beneficial owner of any such book-entry Certificate (or interest therein) to whom either (a) or (b) above does not
apply shall indemnify and hold harmless the Company, the Trustee, the Master Servicer, any Subservicer, and the Trust Fund from and against any and all liabilities, claim, cost or
expenses incurred by such parties as a result of its acquisition or holding of such Certificate.
 
 
 
08/24/2007 12:55:16PM Residential Funding Company, LLC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Page 18 of 18

 
Statement To Certificateholder
 
 
 
Residential Asset Securities Corp., 2007-KS4
 
August 27, 2007
 
 
 
Cash Flow Received and Uses of Funds
 
 
Cash Flow Received Amount
Principal and Interest Payments 4,111,562.43
Prepayment Premium 32,529.67
Liquidation and Insurance Proceeds 0.00
Subsequent Recoveries 0.00
Repurchase Proceeds 0.00
Other Deposits/Adjustments (including Derivatives Payment) 57,677.91
Total Deposits 4,201,770.01
   
Uses of Funds Amount
Transfer to Certificate Account 4,199,925.56
Reimbursed Advances and Expenses 0.00
Master Servicing Compensation 1,844.47
Derivatives Payment 0.00
Total Withdrawals 4,201,770.03
   
Ending Balance 0.00
 
 
GMAC-RFC, 2255 North Ontario Street, Suite 400, Burbank, CA 91504, 818.260.1400, www.gmacrfc.com/investors Appendix A