Analysis Overview
SHA256
1d2e094fb574bb2d941f69394e1324fce3247cdfa8c5e09fee9c18a906b1e88d
Threat Level: Known bad
The file 6a27d634d60cf8f2b9271c185cf76da2 was found to be: Known bad.
Malicious Activity Summary
Darkcomet
Modifies WinLogon for persistence
Checks BIOS information in registry
Adds Run key to start application
Suspicious use of SetThreadContext
Suspicious use of NtSetInformationThreadHideFromDebugger
Program crash
Unsigned PE
Suspicious use of WriteProcessMemory
Enumerates system info in registry
Checks processor information in registry
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-20 10:13
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-01-20 10:13
Reported
2024-01-20 10:15
Platform
win7-20231129-en
Max time kernel
119s
Max time network
119s
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\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3470981204-343661084-3367201002-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3470981204-343661084-3367201002-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Windows\SysWOW64\notepad.exe | N/A |
Suspicious use of NtSetInformationThreadHideFromDebugger
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2888 set thread context of 2736 | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe |
| PID 2736 set thread context of 2588 | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | C:\Windows\SysWOW64\explorer.exe |
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\explorer.exe |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe
"C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe"
C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe
C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe
C:\Windows\SysWOW64\notepad.exe
notepad
C:\Windows\SysWOW64\explorer.exe
"C:\Windows\SysWOW64\explorer.exe"
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2588 -s 176
Network
Files
memory/2888-0-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/2736-4-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/2736-5-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/2736-8-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/2736-9-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/2888-7-0x0000000003DD0000-0x000000000418F000-memory.dmp
memory/2888-6-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/2736-11-0x0000000000280000-0x0000000000281000-memory.dmp
memory/2736-10-0x0000000013140000-0x00000000131F6000-memory.dmp
C:\Windupdt\winupdate.exe
| MD5 | dda5c16e3bdd301ea2d7581501073ede |
| SHA1 | 571eb4c17a7dbe4d8f2da795bb2ba379412ecf54 |
| SHA256 | 95e5b4e84284d0f80d94626ac2a6fb4d96e93c2ca0560c78d85734e50deda861 |
| SHA512 | fa55834ce4e233365fc24142b8b2759fae49fc217114189090f33ce4fc09df34b660384bfe844235c0e1c27b048fca4a857c6464094898162abe0bfd72608566 |
memory/2028-43-0x00000000002F0000-0x00000000002F1000-memory.dmp
memory/2028-13-0x0000000000080000-0x0000000000081000-memory.dmp
memory/2588-52-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/2588-54-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/2736-55-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/2588-50-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-20 10:13
Reported
2024-01-20 10:15
Platform
win10v2004-20231222-en
Max time kernel
145s
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\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3803511929-1339359695-2191195476-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3803511929-1339359695-2191195476-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Windows\SysWOW64\notepad.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 3572 set thread context of 5036 | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe |
| PID 5036 set thread context of 880 | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | C:\Windows\SysWOW64\explorer.exe |
Program crash
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\explorer.exe |
| N/A | N/A | C:\Windows\SysWOW64\WerFault.exe | C:\Windows\SysWOW64\explorer.exe |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
| N/A | N/A | C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe | N/A |
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe
"C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe"
C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe
C:\Users\Admin\AppData\Local\Temp\6a27d634d60cf8f2b9271c185cf76da2.exe
C:\Windows\SysWOW64\explorer.exe
"C:\Windows\SysWOW64\explorer.exe"
C:\Windows\SysWOW64\notepad.exe
notepad
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 880 -ip 880
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 880 -s 424
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 880 -ip 880
C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 880 -s 428
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 71.31.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | g.bing.com | udp |
| US | 204.79.197.200:443 | g.bing.com | tcp |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 180.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 41.110.16.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.205.72.20.in-addr.arpa | udp |
| NL | 52.142.223.178:80 | tcp | |
| US | 8.8.8.8:53 | 157.123.68.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 56.126.166.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 194.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 14.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | tse1.mm.bing.net | udp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 204.79.197.200:443 | tse1.mm.bing.net | tcp |
| US | 8.8.8.8:53 | 9.179.89.13.in-addr.arpa | udp |
Files
memory/3572-0-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/5036-4-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/5036-5-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/5036-6-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/3572-7-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/5036-9-0x00000000024C0000-0x00000000024C1000-memory.dmp
memory/880-17-0x0000000000400000-0x00000000007BF000-memory.dmp
C:\Windupdt\winupdate.exe
| MD5 | 4e6007d7c78943ebac012ffea154fc6f |
| SHA1 | 819497a5d71304194804b7e83d88b84815ca796e |
| SHA256 | 478cf4e506d591245aa432fe7bd743753b78f9f62efa7c53a3fcb6a4d8719b85 |
| SHA512 | 7d6b2acebc2455f755ca7a5adf00ab716e15039a97c1009360f0a205d3907991a7e1e12d49eb8b90797b9e60d5106b68dfd0312f129c1c01952269ee17aee453 |
C:\Windupdt\winupdate.exe
| MD5 | 6645f3c89747d9bc1431e3f1e63d180e |
| SHA1 | 5961aae00e2704c2990f9f82949800fc8d942b46 |
| SHA256 | b141f1846303e0e06b25b39a11e964ea4dfcd4ef2a213fce562ac85e7465faf3 |
| SHA512 | 6b0650c162cfe853782d0f6ea486a76adbb5cf612bfc2cbcdf920bd85a3e5f67ac988afa7acf848a2cc0f4489618f59fc965b0687e1e742cc0f6b859ec2debc1 |
memory/5036-20-0x0000000013140000-0x00000000131F6000-memory.dmp
memory/880-19-0x0000000000400000-0x00000000007BF000-memory.dmp
memory/4548-11-0x0000000000750000-0x0000000000751000-memory.dmp
memory/5036-8-0x0000000013140000-0x00000000131F6000-memory.dmp