Analysis Overview
SHA256
3f19fa1892210bd294995f2a1a35487161f1dc17ec665565cc30353a7c4f3966
Threat Level: Known bad
The file 6b83823e49a39f298c15c3ff547fa406 was found to be: Known bad.
Malicious Activity Summary
Darkcomet
Modifies WinLogon for persistence
Darkcomet family
Checks computer location settings
Deletes itself
Executes dropped EXE
Loads dropped DLL
Adds Run key to start application
Unsigned PE
Enumerates physical storage devices
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Suspicious use of AdjustPrivilegeToken
Runs ping.exe
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-20 21:25
Signatures
Darkcomet family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-01-20 21:25
Reported
2024-01-20 21:27
Platform
win7-20231215-en
Max time kernel
147s
Max time network
148s
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:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe | N/A |
Deletes itself
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\cmd.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe | N/A |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3601492379-692465709-652514833-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe | N/A |
Enumerates physical storage devices
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\PING.EXE | N/A |
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe
"C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe"
C:\Windupdt\winupdate.exe
"C:\Windupdt\winupdate.exe"
C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1 -n 5
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k ping 127.0.0.1 -n 5 > NUL&del "C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe"
Network
| Country | Destination | Domain | Proto |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp |
Files
memory/2440-0-0x0000000000260000-0x0000000000261000-memory.dmp
\Windupdt\winupdate.exe
| MD5 | 6b83823e49a39f298c15c3ff547fa406 |
| SHA1 | 87a6d44cfe44f3d452465ca8512b1a06041d92dd |
| SHA256 | 3f19fa1892210bd294995f2a1a35487161f1dc17ec665565cc30353a7c4f3966 |
| SHA512 | 7aac8200aab701757e8bb05e2d2b49933f263e406f8782a8e9a94ba81a5763c088bee70a69db7720c6e1474ea1e1f6c470d00dd3e8f28449c921e0757dc34c99 |
memory/2440-12-0x0000000000400000-0x00000000004CC000-memory.dmp
memory/2076-13-0x0000000000400000-0x00000000004CC000-memory.dmp
memory/2076-15-0x0000000000400000-0x00000000004CC000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-20 21:25
Reported
2024-01-20 21:27
Platform
win10v2004-20231215-en
Max time kernel
147s
Max time network
151s
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:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe | N/A |
Enumerates physical storage devices
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\PING.EXE | N/A |
Suspicious behavior: GetForegroundWindowSpam
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe
"C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe"
C:\Windupdt\winupdate.exe
"C:\Windupdt\winupdate.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k ping 127.0.0.1 -n 5 > NUL&del "C:\Users\Admin\AppData\Local\Temp\6b83823e49a39f298c15c3ff547fa406.exe"
C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1 -n 5
Network
| Country | Destination | Domain | Proto |
| GB | 176.227.221.40:1604 | tcp | |
| US | 8.8.8.8:53 | 28.118.140.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 181.178.17.96.in-addr.arpa | udp |
| US | 20.231.121.79:80 | tcp | |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 68.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 16.234.44.23.in-addr.arpa | udp |
| GB | 176.227.221.40:1604 | tcp | |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 50.23.12.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 0.204.248.87.in-addr.arpa | udp |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| US | 8.8.8.8:53 | 180.178.17.96.in-addr.arpa | udp |
| GB | 176.227.221.40:1604 | tcp | |
| US | 8.8.8.8:53 | 200.178.17.96.in-addr.arpa | udp |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp | |
| GB | 176.227.221.40:1604 | tcp |
Files
memory/1932-0-0x0000000002420000-0x0000000002421000-memory.dmp
C:\Windupdt\winupdate.exe
| MD5 | 6b83823e49a39f298c15c3ff547fa406 |
| SHA1 | 87a6d44cfe44f3d452465ca8512b1a06041d92dd |
| SHA256 | 3f19fa1892210bd294995f2a1a35487161f1dc17ec665565cc30353a7c4f3966 |
| SHA512 | 7aac8200aab701757e8bb05e2d2b49933f263e406f8782a8e9a94ba81a5763c088bee70a69db7720c6e1474ea1e1f6c470d00dd3e8f28449c921e0757dc34c99 |
C:\Windupdt\winupdate.exe
| MD5 | bf1de2ad20fb031ab0eb6e804dd78808 |
| SHA1 | 54e9be2977fdc096fafeead48b01e7fa9be02521 |
| SHA256 | 5670bfc3cb11e85452ff8a1ab9ddf9ec943734c567c38c628d47c1a3adb16157 |
| SHA512 | 1c9455391a28149e173e7f0b3a43fedd41e05cc4441d2779b0862ab54c4d8b3d3dc4817a9f083ad0c48b25983b1a5dc36fa972db6578fd17228effe016008e11 |
memory/1932-10-0x0000000000400000-0x00000000004CC000-memory.dmp
memory/4476-11-0x0000000002180000-0x0000000002181000-memory.dmp
memory/4476-12-0x0000000000400000-0x00000000004CC000-memory.dmp
memory/4476-13-0x0000000000400000-0x00000000004CC000-memory.dmp