darkcomet | b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a

Analysis

max time kernel
190s
max time network
192s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
20-10-2022 21:51

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General

Target

b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Size

402KB
MD5

a018400102cad9b5628ceda688e20c40
SHA1

cbc3d0f75f200330783036288c3ce90e13b0cfa1
SHA256

b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a
SHA512

6efb63cd234d364d1fcbdaa5d5d518c09c000ece6b896e654f4a4c1e1241655dcb12f21e5108099962a7a704cdec41d306b3546900e4e3b5a9e498555b397b6d
SSDEEP

6144:DBJVqu5jxRl+t6Ge0qw0kw9+Ks9a8/7z6lnRy8HuDlD3nbBalsYECdc70JwdK+Jh:DtqwjxRl+t6GfL7zcRyauJbcsAc7Yw

Score

10^/10

darkcomet vitma evasion persistence rat trojan upx

Malware Config

Extracted

Family

darkcomet

Botnet

Vitma

driofraps.no-ip.org:2222

Mutex

DC_MUTEX-54TC9J0

Attributes

InstallPath
MSDCSC\chrome.exe
gencode
a9QNqgBQ04mL
install
true
offline_keylogger
true
persistence
true
reg_key
MicroUpdate

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\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\AppData\\Roaming\\MSDCSC\\chrome.exe"	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe

Disables Task Manager via registry modification
evasion

Executes dropped EXE 1 IoCs

pid	Process
2136	chrome.exe

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1158

pid	Process
2768	attrib.exe
4216	attrib.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4208-132-0x0000000000400000-0x00000000004DC000-memory.dmp	upx
behavioral2/files/0x0007000000022e21-139.dat	upx
behavioral2/files/0x0007000000022e21-140.dat	upx
behavioral2/memory/4208-142-0x0000000000400000-0x00000000004DC000-memory.dmp	upx
behavioral2/memory/2136-143-0x0000000000400000-0x00000000004DC000-memory.dmp	upx

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\AppData\\Roaming\\MSDCSC\\chrome.exe"	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\AppData\\Roaming\\MSDCSC\\chrome.exe"	chrome.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2136	chrome.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeSecurityPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeTakeOwnershipPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeLoadDriverPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeSystemProfilePrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeSystemtimePrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeProfSingleProcessPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeIncBasePriorityPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeCreatePagefilePrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeBackupPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeRestorePrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeShutdownPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeDebugPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeSystemEnvironmentPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeChangeNotifyPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeRemoteShutdownPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeUndockPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeManageVolumePrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeImpersonatePrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeCreateGlobalPrivilege	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: 33	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: 34	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: 35	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: 36	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
Token: SeIncreaseQuotaPrivilege	2136	chrome.exe
Token: SeSecurityPrivilege	2136	chrome.exe
Token: SeTakeOwnershipPrivilege	2136	chrome.exe
Token: SeLoadDriverPrivilege	2136	chrome.exe
Token: SeSystemProfilePrivilege	2136	chrome.exe
Token: SeSystemtimePrivilege	2136	chrome.exe
Token: SeProfSingleProcessPrivilege	2136	chrome.exe
Token: SeIncBasePriorityPrivilege	2136	chrome.exe
Token: SeCreatePagefilePrivilege	2136	chrome.exe
Token: SeBackupPrivilege	2136	chrome.exe
Token: SeRestorePrivilege	2136	chrome.exe
Token: SeShutdownPrivilege	2136	chrome.exe
Token: SeDebugPrivilege	2136	chrome.exe
Token: SeSystemEnvironmentPrivilege	2136	chrome.exe
Token: SeChangeNotifyPrivilege	2136	chrome.exe
Token: SeRemoteShutdownPrivilege	2136	chrome.exe
Token: SeUndockPrivilege	2136	chrome.exe
Token: SeManageVolumePrivilege	2136	chrome.exe
Token: SeImpersonatePrivilege	2136	chrome.exe
Token: SeCreateGlobalPrivilege	2136	chrome.exe
Token: 33	2136	chrome.exe
Token: 34	2136	chrome.exe
Token: 35	2136	chrome.exe
Token: 36	2136	chrome.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2136	chrome.exe

Suspicious use of WriteProcessMemory 54 IoCs

description	pid	Process	procid_target
PID 4208 wrote to memory of 2256	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	80
PID 4208 wrote to memory of 2256	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	80
PID 4208 wrote to memory of 2256	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	80
PID 4208 wrote to memory of 4972	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	81
PID 4208 wrote to memory of 4972	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	81
PID 4208 wrote to memory of 4972	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	81
PID 2256 wrote to memory of 4216	2256	cmd.exe	85
PID 2256 wrote to memory of 4216	2256	cmd.exe	85
PID 2256 wrote to memory of 4216	2256	cmd.exe	85
PID 4972 wrote to memory of 2768	4972	cmd.exe	84
PID 4972 wrote to memory of 2768	4972	cmd.exe	84
PID 4972 wrote to memory of 2768	4972	cmd.exe	84
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 4024	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	86
PID 4208 wrote to memory of 2136	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	87
PID 4208 wrote to memory of 2136	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	87
PID 4208 wrote to memory of 2136	4208	b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe	87
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88
PID 2136 wrote to memory of 236	2136	chrome.exe	88

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
2768	attrib.exe
4216	attrib.exe

C:\Users\Admin\AppData\Local\Temp\b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe
"C:\Users\Admin\AppData\Local\Temp\b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4208
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe" +s +h
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2256
- - C:\Windows\SysWOW64\attrib.exe
    attrib "C:\Users\Admin\AppData\Local\Temp\b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a.exe" +s +h
    3⤵
    - Sets file to hidden
    - Views/modifies file attributes
    PID:4216
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4972
- - C:\Windows\SysWOW64\attrib.exe
    attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
    3⤵
    - Sets file to hidden
    - Views/modifies file attributes
    PID:2768
- C:\Windows\SysWOW64\notepad.exe
  notepad
  2⤵
  PID:4024
- C:\Users\Admin\AppData\Roaming\MSDCSC\chrome.exe
  "C:\Users\Admin\AppData\Roaming\MSDCSC\chrome.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2136
- - C:\Windows\SysWOW64\notepad.exe
    notepad
    3⤵
    PID:236

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

T1158

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Hidden Files and Directories

T1158

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\MSDCSC\chrome.exe

Filesize
402KB

MD5
a018400102cad9b5628ceda688e20c40

SHA1
cbc3d0f75f200330783036288c3ce90e13b0cfa1

SHA256
b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a

SHA512
6efb63cd234d364d1fcbdaa5d5d518c09c000ece6b896e654f4a4c1e1241655dcb12f21e5108099962a7a704cdec41d306b3546900e4e3b5a9e498555b397b6d

Download Submit
C:\Users\Admin\AppData\Roaming\MSDCSC\chrome.exe

Filesize
402KB

MD5
a018400102cad9b5628ceda688e20c40

SHA1
cbc3d0f75f200330783036288c3ce90e13b0cfa1

SHA256
b21ac76abc67bfdda50c9b93f9c8bf876d14298edd879c66d50960d5957a521a

SHA512
6efb63cd234d364d1fcbdaa5d5d518c09c000ece6b896e654f4a4c1e1241655dcb12f21e5108099962a7a704cdec41d306b3546900e4e3b5a9e498555b397b6d

Download Submit
memory/236-141-0x0000000000000000-mapping.dmp

Download
memory/2136-138-0x0000000000000000-mapping.dmp

Download
memory/2136-143-0x0000000000400000-0x00000000004DC000-memory.dmp

Filesize
880KB

Download
memory/2256-133-0x0000000000000000-mapping.dmp

Download
memory/2768-136-0x0000000000000000-mapping.dmp

Download
memory/4024-137-0x0000000000000000-mapping.dmp

Download
memory/4208-132-0x0000000000400000-0x00000000004DC000-memory.dmp

Filesize
880KB

Download
memory/4208-142-0x0000000000400000-0x00000000004DC000-memory.dmp

Filesize
880KB

Download
memory/4216-135-0x0000000000000000-mapping.dmp

Download
memory/4972-134-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads