Analysis Overview
SHA256
3d849011f1bda6edb5e9eebfb1c639fb0d5d4dc20cfc7605401e661a0ef1ebd2
Threat Level: Known bad
The file 6aa399068d8103d8e7e44c76a04a927f was found to be: Known bad.
Malicious Activity Summary
Darkcomet
Modifies WinLogon for persistence
Drops file in Drivers directory
Loads dropped DLL
Uses the VBS compiler for execution
Executes dropped EXE
Checks BIOS information in registry
Adds Run key to start application
Suspicious use of SetThreadContext
Unsigned PE
Modifies registry class
Suspicious use of WriteProcessMemory
Enumerates system info in registry
Checks processor information in registry
Suspicious use of AdjustPrivilegeToken
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-20 14:11
Signatures
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral1
Detonation Overview
Submitted
2024-01-20 14:11
Reported
2024-01-20 14:14
Platform
win7-20231215-en
Max time kernel
120s
Max time network
121s
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:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Windupdt\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Drops file in Drivers directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\drivers\etc\hosts | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe | N/A |
Loads dropped DLL
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Uses the VBS compiler for execution
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3818056530-936619650-3554021955-1000\Software\Microsoft\Windows\CurrentVersion\Run\DefaultSystem = "C:\\ProgramData\\Sys32c.exe" | C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3818056530-936619650-3554021955-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Windupdt\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 1684 set thread context of 2664 | N/A | C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe
"C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe"
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
"C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe"
Network
Files
memory/1684-1-0x0000000000B20000-0x0000000000B60000-memory.dmp
memory/1684-0-0x0000000074DC0000-0x000000007536B000-memory.dmp
memory/1684-2-0x0000000074DC0000-0x000000007536B000-memory.dmp
memory/2664-7-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-5-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-9-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-3-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-13-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-11-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-15-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-17-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-22-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-21-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-19-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
memory/1684-27-0x0000000074DC0000-0x000000007536B000-memory.dmp
memory/2664-26-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-30-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2664-29-0x0000000000340000-0x0000000000341000-memory.dmp
memory/2664-28-0x0000000000400000-0x00000000004D9000-memory.dmp
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | fde07b7deb47f1739dd6879f3505ebc5 |
| SHA1 | c5325e9d9eb9f5766061fa88ff55fee70bbd6a4f |
| SHA256 | c455c9e8977b4f912bcf7bba61d089aa444101f11ab8a2e5052ad46e637de9cb |
| SHA512 | 3a50a603743e68f4d3cbcda2c4be31bdf0394fd2bce3408fee3568241f6336bd0e82911e63ebc93febd08adf11373b9c969d734f9dcd2dc41dc34881a357b3ab |
memory/2664-39-0x0000000000400000-0x00000000004D9000-memory.dmp
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | 028ba1b5349e19e13e8aaa82c07ee968 |
| SHA1 | bfabce674641a7733facbaf462e8c8628b2d5acc |
| SHA256 | 2c56a9575c13e93fdb87c9d0b790ae313c61895e40627541d1ba8c5012b47959 |
| SHA512 | 1287d524033bdfc394460398ced6ae937f56647e5364f85ef8a3fc9ba6db9f87498f29656eb2b647583dcc295c61da1d969fe991fc7f541f784891e7dfc88078 |
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | 4326c5bcbaf649fd8bc88ef80532c4a5 |
| SHA1 | bbddc8b8cb109bf39b90ff19d3a37146af690f49 |
| SHA256 | 8e8be1be8c5159db747dcd1454addfd82644e74ddb0375f35ff52f831c429887 |
| SHA512 | 6ea384987b96a0d684822af4d130aad3385eda01b618172d76fa4c048340b908b73425f5d9d52ca7a10481eb553bd09ed0d8bdb24a3c6e48d5e3f6b55492e0b7 |
\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | a141a3effac6f617f8614a0586c8d406 |
| SHA1 | 72b8dad141ab1ea1ed51ebcf2b7d834f49ed037b |
| SHA256 | 50b6c15871317bfaa0376230cb537cc8fcfee7277570c34895179dabce8ac776 |
| SHA512 | ef18f56ae40a4193a4d87d1ad6dd3d426dcd47c895920bd6205274601e853383a34b613c72dca1412d448ab8173892309226c4f537326f1e301e01404429036b |
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-20 14:11
Reported
2024-01-20 14:14
Platform
win10v2004-20231222-en
Max time kernel
150s
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:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Windupdt\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Drops file in Drivers directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\drivers\etc\hosts | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Checks BIOS information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe | N/A |
Uses the VBS compiler for execution
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\DefaultSystem = "C:\\ProgramData\\Sys32c.exe" | C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe | N/A |
| Set value (str) | \REGISTRY\USER\S-1-5-21-3803511929-1339359695-2191195476-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Windupdt\\winupdate.exe" | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of SetThreadContext
| Description | Indicator | Process | Target |
| PID 2776 set thread context of 4520 | N/A | C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe |
Checks processor information in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key opened | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Enumerates system info in registry
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\ | C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe | N/A |
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Processes
C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe
"C:\Users\Admin\AppData\Local\Temp\6aa399068d8103d8e7e44c76a04a927f.exe"
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
"C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 200.197.79.204.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 72.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 209.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.150.49.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 9.228.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 73.31.126.40.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 | 183.59.114.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 195.233.44.23.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 149.220.183.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 171.39.242.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 119.110.54.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 100.5.17.2.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 173.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 211.135.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 18.134.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | udp | |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 176.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 11.227.111.52.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 | 170.117.168.52.in-addr.arpa | udp |
| GB | 96.17.178.176:80 | tcp |
Files
memory/2776-2-0x00000000748C0000-0x0000000074E71000-memory.dmp
memory/2776-1-0x00000000014D0000-0x00000000014E0000-memory.dmp
memory/2776-0-0x00000000748C0000-0x0000000074E71000-memory.dmp
memory/4520-4-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/4520-3-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/4520-5-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/2776-10-0x00000000748C0000-0x0000000074E71000-memory.dmp
memory/4520-11-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/4520-12-0x0000000000400000-0x00000000004D9000-memory.dmp
memory/4520-13-0x00000000021F0000-0x00000000021F1000-memory.dmp
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | 66e265ca827a401294e0064082a71e29 |
| SHA1 | d2dee7d9b7415b89f866d557aee69c7e74cc15a7 |
| SHA256 | 8de30cb4c4be2b0f508ad074be04fdca829e7530f062319cc35da16dcb581f54 |
| SHA512 | 3107dd5f5604f5fcbab46e6cc72e77a4d0565ecca06ba234022022c037604c40c918d233442b028716694cafa3a755c4f0bc2960ecc49810e9eb9bcdeb1aa891 |
memory/4520-74-0x0000000000400000-0x00000000004D9000-memory.dmp
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | 3a3ba4b6373bde1843d01d10e1b6ee64 |
| SHA1 | d9aa125d1b58ccb3d0fec336629e860f8e028a8a |
| SHA256 | 968809fd7feeecdfcf8bf29a88ccc55c3f95d15aca6b7a2afbdbeaf757152600 |
| SHA512 | 1d5fc30e00f36a308467ed74f4e3d6e8463278b82c93076e2ad8131d66adac50ea57da2f93b53abcf5f5b81fa5ef427e9137589d870bab15282f6c796f11477e |
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Windupdt\winupdate.exe
| MD5 | 8e39fd2e9d75384394c5d6a8b36fe59a |
| SHA1 | ca665be11d79e27916e1672a3ecab3ae868da50a |
| SHA256 | abed5d6051f25910572df226c0c9aa26a26993507edc554f0c93b51af0e8310a |
| SHA512 | a90e19d14fd945f67645aed436bfe46fad9e37dbc6d9d13b2d55041209cbdf378ead883cec767570704a452165a60093007e506822f6c8c0bd1e4ed5c02b8f88 |