darkcomet | 136eddfd86a8ee4a6e6c8ed4d82bc78e795e5f02ff5e347dd95893a9b011222f

General

Target
Payment 831.exe
Size 2.1MB
Sample210404-8sd2rmtbdn
SHA256 136eddfd86a8ee4a6e6c8ed4d82bc78e795e5f02ff5e347dd95893a9b011222f
MD5 90f1582eb4aa8c5db832919e5e475fc5
SHA1 bbc4d5e90346af2ec03f7ec4af33a728108818a3
SHA512 37cd15caa53b047036334cf5b19ffaf7fc94aa32d4dc8648c2fe0c1bd623e332f70778b2bb59c3aeaf0f6ba5cae6fa1c1a360780e1c7d29e4be4a4d9ab459b43
MD5 SHA1 SHA512

Score

10^/10

darkcomet april 2021 evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

April 2021

C2

bonding79.ddns.net:3316
goodgt79.ddns.net:3316
whatis79.ddns.net:3316
smath79.ddns.net:3316
jacknop79.ddns.net:3316
chrisle79.ddns.net:3316

Mutex

DC_MUTEX-L1TFBNC

Attributes

gencode
PvcfTTVpBSKd
install
false
offline_keylogger
true
password
Password20$
persistence
false

Signatures

Darkcomet
DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.
trojan rat darkcomet

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "\"C:\\Users\\Admin\\AppData\\Roaming\\4623ct41TTgJMuPp\\RZ2rQ22xpUxN.exe\",explorer.exe"	Payment 831.exe

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Payment 831.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Payment 831.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Wine	Payment 831.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 800 set thread context of 576	800	Payment 831.exe	29

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
800	Payment 831.exe
800	Payment 831.exe

Suspicious use of AdjustPrivilegeToken 25 IoCs

description	pid	Process
Token: SeDebugPrivilege	800	Payment 831.exe
Token: SeDebugPrivilege	800	Payment 831.exe
Token: SeIncreaseQuotaPrivilege	576	vbc.exe
Token: SeSecurityPrivilege	576	vbc.exe
Token: SeTakeOwnershipPrivilege	576	vbc.exe
Token: SeLoadDriverPrivilege	576	vbc.exe
Token: SeSystemProfilePrivilege	576	vbc.exe
Token: SeSystemtimePrivilege	576	vbc.exe
Token: SeProfSingleProcessPrivilege	576	vbc.exe
Token: SeIncBasePriorityPrivilege	576	vbc.exe
Token: SeCreatePagefilePrivilege	576	vbc.exe
Token: SeBackupPrivilege	576	vbc.exe
Token: SeRestorePrivilege	576	vbc.exe
Token: SeShutdownPrivilege	576	vbc.exe
Token: SeDebugPrivilege	576	vbc.exe
Token: SeSystemEnvironmentPrivilege	576	vbc.exe
Token: SeChangeNotifyPrivilege	576	vbc.exe
Token: SeRemoteShutdownPrivilege	576	vbc.exe
Token: SeUndockPrivilege	576	vbc.exe
Token: SeManageVolumePrivilege	576	vbc.exe
Token: SeImpersonatePrivilege	576	vbc.exe
Token: SeCreateGlobalPrivilege	576	vbc.exe
Token: 33	576	vbc.exe
Token: 34	576	vbc.exe
Token: 35	576	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
576	vbc.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29
PID 800 wrote to memory of 576	800	Payment 831.exe	29

C:\Users\Admin\AppData\Local\Temp\Payment 831.exe
"C:\Users\Admin\AppData\Local\Temp\Payment 831.exe"
1⤵
- Modifies WinLogon for persistence
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:800
- C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
  "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe"
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:576