darkcomet | e1239f00d096ca7c112ae7e0c4f6a2d622b5d59b4702c80fc62b25c83c733473

General

Target

Purchase Order 781.exe

Score

10^/10

darkcomet may 2021 evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

May 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-PPMNGQA

Attributes

gencode
AUQYBsRj2TWk
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:

Purchase Order 781.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "\"C:\\Users\\Admin\\AppData\\Roaming\\k6l50Mr8Exu7gS7Z\\tMfTCvF5oIX2.exe\",explorer.exe"	Purchase Order 781.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:

Purchase Order 781.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	Purchase Order 781.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	Purchase Order 781.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:

Purchase Order 781.exe

description ioc process

Key opened \REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Wine Purchase Order 781.exe
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Suspicious use of SetThreadContext 1 IoCs

Processes:

Purchase Order 781.exe

description pid process target process

PID 1492 set thread context of 1808 1492 Purchase Order 781.exe vbc.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Purchase Order 781.exe

pid process

1492 Purchase Order 781.exe
1492 Purchase Order 781.exe

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Wine	Purchase Order 781.exe

description	pid	process	target process
PID 1492 set thread context of 1808	1492	Purchase Order 781.exe	vbc.exe

pid	process
1492	Purchase Order 781.exe
1492	Purchase Order 781.exe

Suspicious use of AdjustPrivilegeToken 25 IoCs

Processes:

Purchase Order 781.exevbc.exe

description	pid	process
Token: SeDebugPrivilege	1492	Purchase Order 781.exe
Token: SeDebugPrivilege	1492	Purchase Order 781.exe
Token: SeIncreaseQuotaPrivilege	1808	vbc.exe
Token: SeSecurityPrivilege	1808	vbc.exe
Token: SeTakeOwnershipPrivilege	1808	vbc.exe
Token: SeLoadDriverPrivilege	1808	vbc.exe
Token: SeSystemProfilePrivilege	1808	vbc.exe
Token: SeSystemtimePrivilege	1808	vbc.exe
Token: SeProfSingleProcessPrivilege	1808	vbc.exe
Token: SeIncBasePriorityPrivilege	1808	vbc.exe
Token: SeCreatePagefilePrivilege	1808	vbc.exe
Token: SeBackupPrivilege	1808	vbc.exe
Token: SeRestorePrivilege	1808	vbc.exe
Token: SeShutdownPrivilege	1808	vbc.exe
Token: SeDebugPrivilege	1808	vbc.exe
Token: SeSystemEnvironmentPrivilege	1808	vbc.exe
Token: SeChangeNotifyPrivilege	1808	vbc.exe
Token: SeRemoteShutdownPrivilege	1808	vbc.exe
Token: SeUndockPrivilege	1808	vbc.exe
Token: SeManageVolumePrivilege	1808	vbc.exe
Token: SeImpersonatePrivilege	1808	vbc.exe
Token: SeCreateGlobalPrivilege	1808	vbc.exe
Token: 33	1808	vbc.exe
Token: 34	1808	vbc.exe
Token: 35	1808	vbc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

vbc.exe

pid process

1808 vbc.exe

pid	process
1808	vbc.exe

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

Purchase Order 781.exe

description	pid	process	target process
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe
PID 1492 wrote to memory of 1808	1492	Purchase Order 781.exe	vbc.exe

C:\Users\Admin\AppData\Local\Temp\Purchase Order 781.exe
"C:\Users\Admin\AppData\Local\Temp\Purchase Order 781.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:1492

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:1808

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

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1492-59-0x00000000754F1000-0x00000000754F3000-memory.dmp

Filesize
8KB

Download
memory/1492-60-0x0000000000E40000-0x00000000012A0000-memory.dmp

Filesize
4.4MB

Download
memory/1492-61-0x0000000004C90000-0x0000000004C91000-memory.dmp

Filesize
4KB

Download
memory/1808-62-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/1808-63-0x000000000048F888-mapping.dmp

Download
memory/1808-66-0x0000000000250000-0x0000000000251000-memory.dmp

Filesize
4KB

Download
memory/1808-65-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads