Analysis Overview
SHA256
3064890364e23210d8fa53391c004a4ad7a97d35bb20de13f12727b0a7398628
Threat Level: Known bad
The file 6a55e570c9897d5bcdb2da37c4d20e0b was found to be: Known bad.
Malicious Activity Summary
Darkcomet
Windows security bypass
Modifies WinLogon for persistence
Modifies security service
Darkcomet family
Sets file to hidden
Checks computer location settings
Loads dropped DLL
Executes dropped EXE
Windows security modification
Adds Run key to start application
Unsigned PE
Enumerates physical storage devices
Modifies registry class
Suspicious use of WriteProcessMemory
System policy modification
Suspicious use of AdjustPrivilegeToken
Runs ping.exe
Suspicious use of SetWindowsHookEx
Views/modifies file attributes
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-01-20 11:41
Signatures
Darkcomet family
Unsigned PE
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Analysis: behavioral2
Detonation Overview
Submitted
2024-01-20 11:41
Reported
2024-01-20 11:43
Platform
win10v2004-20231215-en
Max time kernel
22s
Max time network
164s
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\6a55e570c9897d5bcdb2da37c4d20e0b.exe | N/A |
Modifies security service
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "4" | C:\Windupdt\winupdate.exe | N/A |
Windows security bypass
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
Sets file to hidden
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
Checks computer location settings
| Description | Indicator | Process | Target |
| Key value queried | \REGISTRY\USER\S-1-5-21-1815711207-1844170477-3539718864-1000\Control Panel\International\Geo\Nation | C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe | N/A |
Executes dropped EXE
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windupdt\winupdate.exe | N/A |
Windows security modification
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-1815711207-1844170477-3539718864-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe | N/A |
Enumerates physical storage devices
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\ | C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe | N/A |
Runs ping.exe
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\PING.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
System policy modification
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion | C:\Windupdt\winupdate.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern | C:\Windupdt\winupdate.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern\NoControlPanel = "1" | C:\Windupdt\winupdate.exe | N/A |
Views/modifies file attributes
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe
"C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe" +s +h
C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe" +s +h
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\6a55e570c9897d5bcdb2da37c4d20e0b.exe"
Network
| Country | Destination | Domain | Proto |
| US | 20.231.121.79:80 | tcp | |
| US | 8.8.8.8:53 | 97.17.167.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 194.178.17.96.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 20.160.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 228.249.119.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 26.165.165.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 18.31.95.13.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.86.106.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 18.134.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 0.205.248.87.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 14.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | 15.173.189.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
Files
memory/4540-0-0x00000000022A0000-0x00000000022A1000-memory.dmp
C:\Windupdt\winupdate.exe
| MD5 | 1c8a0fd90dedb1ab5342ed2084ac161a |
| SHA1 | 847f16daa4def68f7b872188bf65b7d713c2b72d |
| SHA256 | 643d4b35db818a64260e5167d5cafebb5217320fb07b54618088a46930762031 |
| SHA512 | 8bdbc74f10d35f9f13c8c42340f172a3696105dcceb797c399ea97108f442c823760375ae0d4a7291b20160306878cf356fa91dc29e968e77eb45378ed1e8761 |
memory/2536-35-0x0000000002710000-0x0000000002711000-memory.dmp
memory/4540-34-0x0000000000400000-0x00000000004B4000-memory.dmp
C:\Windupdt\winupdate.exe
| MD5 | 0c4112280c62a793909828d06acf32d2 |
| SHA1 | eb9540bad25b6e8d1577fea84a15526ad2a44bf6 |
| SHA256 | 8c13d9f495cff0cc9bb4a46f96479db3d69c2e895a311028f106e51a8b95d53e |
| SHA512 | 8b967a900296714bfeea8e737cbca368f7e8a849f25bf6e4f0cd6c59faab85bab47b451667946148916f0d57527c83d1b375161040404d7feb3d051ace735059 |
C:\Windupdt\winupdate.exe
| MD5 | 4096999cdf78123c8099e51f5d668fb8 |
| SHA1 | 910f2fa6caa58000ae2f9687ddb91a2d5ac164e6 |
| SHA256 | 4e6e178dc4cc7880c466beb4d09396d8bec815fb92202f0a5744d12c54462223 |
| SHA512 | cfc0e79d3b50e340f0850fc72e30f35c3ee3c6eec7e23eacbd1ae532c3bdedbba45875a05ca7710cacbe39b52fc85dcf4fe26ea41397167179e6e7e678a62bb5 |
memory/2536-36-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-37-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-38-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-39-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-40-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-41-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-42-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-43-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-44-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-45-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-46-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-47-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-48-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2536-49-0x0000000000400000-0x00000000004B4000-memory.dmp
Analysis: behavioral1
Detonation Overview
Submitted
2024-01-20 11:41
Reported
2024-01-20 11:43
Platform
win7-20231215-en
Max time kernel
13s
Max time network
19s
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\6a55e570c9897d5bcdb2da37c4d20e0b.exe | N/A |
Modifies security service
| Description | Indicator | Process | Target |
| Set value (int) | \REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wscsvc\Start = "4" | C:\Windupdt\winupdate.exe | N/A |
Windows security bypass
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
Sets file to hidden
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\attrib.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\6a55e570c9897d5bcdb2da37c4d20e0b.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 |
Windows security modification
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1" | C:\Windupdt\winupdate.exe | N/A |
Adds Run key to start application
| Description | Indicator | Process | Target |
| Set value (str) | \REGISTRY\USER\S-1-5-21-452311807-3713411997-1028535425-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe" | C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.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 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
System policy modification
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion | C:\Windupdt\winupdate.exe | N/A |
| Key created | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern | C:\Windupdt\winupdate.exe | N/A |
| Set value (str) | \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern\NoControlPanel = "1" | C:\Windupdt\winupdate.exe | N/A |
Views/modifies file attributes
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
| N/A | N/A | C:\Windows\SysWOW64\attrib.exe | N/A |
Processes
C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe
"C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe"
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe" +s +h
C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp\6a55e570c9897d5bcdb2da37c4d20e0b.exe" +s +h
C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
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\6a55e570c9897d5bcdb2da37c4d20e0b.exe"
C:\Windows\SysWOW64\PING.EXE
ping 127.0.0.1 -n 5
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | kabhks.no-ip.org | udp |
Files
memory/1648-0-0x00000000002C0000-0x00000000002C1000-memory.dmp
\Windupdt\winupdate.exe
| MD5 | 6a55e570c9897d5bcdb2da37c4d20e0b |
| SHA1 | 2742f1c6b4881aa16f02910ec46ea77de4b194da |
| SHA256 | 3064890364e23210d8fa53391c004a4ad7a97d35bb20de13f12727b0a7398628 |
| SHA512 | 52b9952288476b32918fca301465f24007dc29f1818227399d7df7e78ea8d61ae0ffb02f661f8275a735ce033a099b640283fb07599013c7b76422a13a21a0be |
memory/1648-9-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2852-13-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2852-14-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2852-15-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2852-16-0x0000000000400000-0x00000000004B4000-memory.dmp
memory/2852-17-0x0000000000400000-0x00000000004B4000-memory.dmp