Analysis Overview
SHA256
8795a5b03ecbfefd9c2e72479025c3dde14313b04985ade80bf2eb21fff12366
Threat Level: Known bad
The file 3dc8ca829ea4639a0d78f05ae481eec0N.exe was found to be: Known bad.
Malicious Activity Summary
Modifies WinLogon for persistence
Darkcomet
Executes dropped EXE
Deletes itself
Checks computer location settings
Loads dropped DLL
Adds Run key to start application
Drops file in System32 directory
Suspicious use of SetThreadContext
Enumerates physical storage devices
Unsigned PE
Program crash
System Location Discovery: System Language Discovery
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-05 02:56
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-08-05 02:56
Reported
2024-08-05 02:58
Platform
win7-20240708-en
Max time kernel
16s
Max time network
17s
Command Line
Signatures
Darkcomet
Modifies WinLogon for persistence
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\MSDCSC\\WindowsUpdate.exe" | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\notepad.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
Loads dropped DLL
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1506706701-1246725540-2219210854-1000\Software\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate = "C:\\Windows\\system32\\MSDCSC\\WindowsUpdate.exe" | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\SysWOW64\MSDCSC\D1.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File created | C:\Windows\SysWOW64\MSDCSC\D2.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\D2.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File created | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\ | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\D1.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File created | C:\Windows\SysWOW64\MSDCSC\D3.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\D3.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2220 set thread context of 2904 | N/A | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe |
| PID 2716 set thread context of 2968 | N/A | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe |
Enumerates physical storage devices
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\notepad.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe
"C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe"
C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe
C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe
C:\Windows\SysWOW64\notepad.exe
notepad
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
"C:\Windows\system32\MSDCSC\WindowsUpdate.exe"
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
Network
Files
memory/2220-0-0x0000000074501000-0x0000000074502000-memory.dmp
memory/2220-1-0x0000000074500000-0x0000000074AAB000-memory.dmp
memory/2220-2-0x0000000074500000-0x0000000074AAB000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\D1.dll
| MD5 | 63fc996c75f5560acbe0a28dfee18f07 |
| SHA1 | f07317e054060d5bc41b9c583ead723288e2cdd4 |
| SHA256 | b1409c400b05819d175022c10ce322d20658cff102d5b78900d4cd2fc20a7dc9 |
| SHA512 | dffe944844fccfa7fadf91326fc931b7536d25f1ce205cd9cafad0319402a2c79dbce96003f441433991eae3685d71cded6ed27a24e21d58463c009461fb5f7e |
\Users\Admin\AppData\Local\Temp\D3.dll
| MD5 | 91e37a28b4ab1e638bd54084a298dad5 |
| SHA1 | 6c3c1d79bb96585738108fafe3d7605183cb5dd9 |
| SHA256 | 0fe99fd185be2fdd7c8d26c972cda38fe14f39a6d4530951ce56fd743c64095e |
| SHA512 | ab3609b69dd33f4bf13aaac5f8ef0dbe9f5001884f068ff5c14ff1c2b529b460ba56bea35e901e16fb1eb133c25c42d9a0ac8db0c542ea4dd450449730efe5b2 |
C:\Users\Admin\AppData\Local\Temp\D2.dll
| MD5 | 2f52e1cc7eb9a7380dbf0d4ec24663bd |
| SHA1 | 7cd8cf6e15a87fa70a0065d4fa2e7cccd62bb85f |
| SHA256 | a62407aaa2d649a6bace93fa802408977844c6a4264df5d1713842b5fb98f386 |
| SHA512 | 8d5450f1ad0c237fc9ea076ecca1ea9667c9f560d6a264349320461ff4f35efaa64a0541167e3f8ad1a13f4f4ef453ec72b5e4d013b7a783a3fabbe1a4426002 |
memory/2904-28-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2904-27-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2904-29-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2220-30-0x0000000074500000-0x0000000074AAB000-memory.dmp
memory/2904-31-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2904-32-0x00000000000C0000-0x00000000000C1000-memory.dmp
memory/2160-52-0x00000000001A0000-0x00000000001A1000-memory.dmp
memory/2160-36-0x00000000000F0000-0x00000000000F1000-memory.dmp
\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
| MD5 | 3dc8ca829ea4639a0d78f05ae481eec0 |
| SHA1 | 02bf8b9d26be7be2727bf980b5eb1e5e1c29bd0d |
| SHA256 | 8795a5b03ecbfefd9c2e72479025c3dde14313b04985ade80bf2eb21fff12366 |
| SHA512 | 5162ee7aaaeabaf66280621bb239f47d3f8e66bc5fa9fee06083c60b9a7f5c27aa66b08dedca083e0e913ca8a9145e951c495fa327c31f822977243b46de8732 |
memory/2904-86-0x0000000000400000-0x00000000004B2000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-08-05 02:56
Reported
2024-08-05 02:58
Platform
win10v2004-20240802-en
Max time kernel
93s
Max time network
97s
Command Line
Signatures
Darkcomet
Modifies WinLogon for persistence
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\MSDCSC\\WindowsUpdate.exe" | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\notepad.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
Loads dropped DLL
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-355097885-2402257403-2971294179-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate = "C:\\Windows\\system32\\MSDCSC\\WindowsUpdate.exe" | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\SysWOW64\MSDCSC\D1.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File created | C:\Windows\SysWOW64\MSDCSC\D3.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\D1.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File created | C:\Windows\SysWOW64\MSDCSC\D2.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\D2.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\D3.dll | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| File created | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| File opened for modification | C:\Windows\SysWOW64\MSDCSC\ | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1460 set thread context of 2164 | N/A | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe |
| PID 1120 set thread context of 2832 | N/A | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe |
Enumerates physical storage devices
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe |
System Location Discovery: System Language Discovery
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\notepad.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe | N/A |
| Key opened | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language | C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe
"C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe"
C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe
C:\Users\Admin\AppData\Local\Temp\3dc8ca829ea4639a0d78f05ae481eec0N.exe
C:\Windows\SysWOW64\notepad.exe
notepad
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
"C:\Windows\system32\MSDCSC\WindowsUpdate.exe"
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2832 -ip 2832
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2832 -s 80
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 13.107.21.237:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 0.159.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 73.144.22.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 237.21.107.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 55.36.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 192.142.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 172.214.232.199.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 19.229.111.52.in-addr.arpa | udp |
Files
memory/1460-0-0x0000000074F32000-0x0000000074F33000-memory.dmp
memory/1460-1-0x0000000074F30000-0x00000000754E1000-memory.dmp
memory/1460-2-0x0000000074F30000-0x00000000754E1000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\D1.dll
| MD5 | 63fc996c75f5560acbe0a28dfee18f07 |
| SHA1 | f07317e054060d5bc41b9c583ead723288e2cdd4 |
| SHA256 | b1409c400b05819d175022c10ce322d20658cff102d5b78900d4cd2fc20a7dc9 |
| SHA512 | dffe944844fccfa7fadf91326fc931b7536d25f1ce205cd9cafad0319402a2c79dbce96003f441433991eae3685d71cded6ed27a24e21d58463c009461fb5f7e |
memory/1460-11-0x0000000074F30000-0x00000000754E1000-memory.dmp
C:\Users\Admin\AppData\Local\Temp\D3.dll
| MD5 | 91e37a28b4ab1e638bd54084a298dad5 |
| SHA1 | 6c3c1d79bb96585738108fafe3d7605183cb5dd9 |
| SHA256 | 0fe99fd185be2fdd7c8d26c972cda38fe14f39a6d4530951ce56fd743c64095e |
| SHA512 | ab3609b69dd33f4bf13aaac5f8ef0dbe9f5001884f068ff5c14ff1c2b529b460ba56bea35e901e16fb1eb133c25c42d9a0ac8db0c542ea4dd450449730efe5b2 |
C:\Users\Admin\AppData\Local\Temp\D2.dll
| MD5 | 2f52e1cc7eb9a7380dbf0d4ec24663bd |
| SHA1 | 7cd8cf6e15a87fa70a0065d4fa2e7cccd62bb85f |
| SHA256 | a62407aaa2d649a6bace93fa802408977844c6a4264df5d1713842b5fb98f386 |
| SHA512 | 8d5450f1ad0c237fc9ea076ecca1ea9667c9f560d6a264349320461ff4f35efaa64a0541167e3f8ad1a13f4f4ef453ec72b5e4d013b7a783a3fabbe1a4426002 |
memory/2164-34-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2164-35-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2164-37-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/1460-38-0x0000000074F30000-0x00000000754E1000-memory.dmp
memory/2164-39-0x0000000000400000-0x00000000004B2000-memory.dmp
memory/2164-40-0x00000000030B0000-0x00000000030B1000-memory.dmp
memory/1248-44-0x0000000000F80000-0x0000000000F81000-memory.dmp
C:\Windows\SysWOW64\MSDCSC\WindowsUpdate.exe
| MD5 | 3dc8ca829ea4639a0d78f05ae481eec0 |
| SHA1 | 02bf8b9d26be7be2727bf980b5eb1e5e1c29bd0d |
| SHA256 | 8795a5b03ecbfefd9c2e72479025c3dde14313b04985ade80bf2eb21fff12366 |
| SHA512 | 5162ee7aaaeabaf66280621bb239f47d3f8e66bc5fa9fee06083c60b9a7f5c27aa66b08dedca083e0e913ca8a9145e951c495fa327c31f822977243b46de8732 |
memory/2164-88-0x0000000000400000-0x00000000004B2000-memory.dmp