darkcomet | 3e6456b94b5d27dfe76535a889fca40c093753320c991f8860d65b298494ef99

General

Target

Payment 381.exe

Score

10^/10

darkcomet february 2021 evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

FEBruary 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-ZKP4D0B

Attributes

gencode
wb6TW2qCEdyf
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

Processes:

Payment 381.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "\"C:\\Users\\Admin\\AppData\\Roaming\\BlVOMYes18rDEfDp\\zf6ZxTySgwGa.exe\",explorer.exe"	Payment 381.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

Processes:

Payment 381.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Payment 381.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Payment 381.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

Processes:

Payment 381.exe

description ioc process

Key opened \REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Wine Payment 381.exe
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Suspicious use of SetThreadContext 1 IoCs

Processes:

Payment 381.exe

description pid process target process

PID 880 set thread context of 3212 880 Payment 381.exe vbc.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Payment 381.exe

pid process

880 Payment 381.exe
880 Payment 381.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-1985363256-3005190890-1182679451-1000\Software\Wine	Payment 381.exe

description	pid	process	target process
PID 880 set thread context of 3212	880	Payment 381.exe	vbc.exe

pid	process
880	Payment 381.exe
880	Payment 381.exe

Suspicious use of AdjustPrivilegeToken 26 IoCs

Processes:

Payment 381.exevbc.exe

description	pid	process
Token: SeDebugPrivilege	880	Payment 381.exe
Token: SeDebugPrivilege	880	Payment 381.exe
Token: SeIncreaseQuotaPrivilege	3212	vbc.exe
Token: SeSecurityPrivilege	3212	vbc.exe
Token: SeTakeOwnershipPrivilege	3212	vbc.exe
Token: SeLoadDriverPrivilege	3212	vbc.exe
Token: SeSystemProfilePrivilege	3212	vbc.exe
Token: SeSystemtimePrivilege	3212	vbc.exe
Token: SeProfSingleProcessPrivilege	3212	vbc.exe
Token: SeIncBasePriorityPrivilege	3212	vbc.exe
Token: SeCreatePagefilePrivilege	3212	vbc.exe
Token: SeBackupPrivilege	3212	vbc.exe
Token: SeRestorePrivilege	3212	vbc.exe
Token: SeShutdownPrivilege	3212	vbc.exe
Token: SeDebugPrivilege	3212	vbc.exe
Token: SeSystemEnvironmentPrivilege	3212	vbc.exe
Token: SeChangeNotifyPrivilege	3212	vbc.exe
Token: SeRemoteShutdownPrivilege	3212	vbc.exe
Token: SeUndockPrivilege	3212	vbc.exe
Token: SeManageVolumePrivilege	3212	vbc.exe
Token: SeImpersonatePrivilege	3212	vbc.exe
Token: SeCreateGlobalPrivilege	3212	vbc.exe
Token: 33	3212	vbc.exe
Token: 34	3212	vbc.exe
Token: 35	3212	vbc.exe
Token: 36	3212	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

vbc.exe

pid process

3212 vbc.exe

pid	process
3212	vbc.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

Payment 381.exe

description	pid	process	target process
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe
PID 880 wrote to memory of 3212	880	Payment 381.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\Payment 381.exe
"C:\Users\Admin\AppData\Local\Temp\Payment 381.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:880
- 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:3212

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

Scripting

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Query Registry

3

T1012

System Information Discovery

1

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/880-2-0x0000000000EC2000-0x0000000000F58000-memory.dmp

Filesize
600KB

Download
memory/880-3-0x00000000046F0000-0x00000000046F1000-memory.dmp

Filesize
4KB

Download
memory/3212-4-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3212-5-0x000000000048F888-mapping.dmp

Download
memory/3212-6-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3212-7-0x0000000000680000-0x0000000000681000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads