darkcomet | 19f4bb3e5785aa78e2e97d59b93fa396636d1d6c9eff94ea8dee21c0b55e2c45

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-11-2024 08:15

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General

Target

Handler.exe
Size

253KB
MD5

9877f2250a1b6f72beedd0cf71b90a6c
SHA1

c8e179559e1d7839ff1078b0685b798ecfc0f8f2
SHA256

19f4bb3e5785aa78e2e97d59b93fa396636d1d6c9eff94ea8dee21c0b55e2c45
SHA512

a1c65f2c0568444f9e5f2f119810c7d4ca3dbd7b1673edd5235e7be4a316e929c608f2e441860da909d1c120c20b5cab44d6bacaa4db076c0b30f5c832936979
SSDEEP

6144:mD7cY2fgssM7Wirg9KXylmRiL+QMeC/i6isqX7UovnONztByipwxZt:ml8E4w5huat7UovONzbXwp

Score

10^/10

darkcomet guest16 discovery persistence rat trojan upx

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

interface-alternate.gl.at.ply.gg:54125

Mutex

DC_MUTEX-VPRU4P1

Attributes

InstallPath
Bloxstrap\Errorhandler.exe
gencode
gEP7RRzUsNHB
install
true
offline_keylogger
true
persistence
false
reg_key
MicroUpdate

Signatures

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

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

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\\Documents\\Bloxstrap\\Errorhandler.exe"	Handler.exe

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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	Handler.exe

Executes dropped EXE 1 IoCs

pid	Process
1744	Errorhandler.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\Bloxstrap\\Errorhandler.exe"	Handler.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3764-0-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral2/files/0x0008000000023cac-6.dat	upx
behavioral2/memory/3764-16-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral2/memory/1744-19-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral2/memory/1744-22-0x0000000000400000-0x00000000004BA000-memory.dmp	upx

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Handler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Errorhandler.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	notepad.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

pid	Process
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe
1744	Errorhandler.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3764	Handler.exe
Token: SeSecurityPrivilege	3764	Handler.exe
Token: SeTakeOwnershipPrivilege	3764	Handler.exe
Token: SeLoadDriverPrivilege	3764	Handler.exe
Token: SeSystemProfilePrivilege	3764	Handler.exe
Token: SeSystemtimePrivilege	3764	Handler.exe
Token: SeProfSingleProcessPrivilege	3764	Handler.exe
Token: SeIncBasePriorityPrivilege	3764	Handler.exe
Token: SeCreatePagefilePrivilege	3764	Handler.exe
Token: SeBackupPrivilege	3764	Handler.exe
Token: SeRestorePrivilege	3764	Handler.exe
Token: SeShutdownPrivilege	3764	Handler.exe
Token: SeDebugPrivilege	3764	Handler.exe
Token: SeSystemEnvironmentPrivilege	3764	Handler.exe
Token: SeChangeNotifyPrivilege	3764	Handler.exe
Token: SeRemoteShutdownPrivilege	3764	Handler.exe
Token: SeUndockPrivilege	3764	Handler.exe
Token: SeManageVolumePrivilege	3764	Handler.exe
Token: SeImpersonatePrivilege	3764	Handler.exe
Token: SeCreateGlobalPrivilege	3764	Handler.exe
Token: 33	3764	Handler.exe
Token: 34	3764	Handler.exe
Token: 35	3764	Handler.exe
Token: 36	3764	Handler.exe
Token: SeIncreaseQuotaPrivilege	1744	Errorhandler.exe
Token: SeSecurityPrivilege	1744	Errorhandler.exe
Token: SeTakeOwnershipPrivilege	1744	Errorhandler.exe
Token: SeLoadDriverPrivilege	1744	Errorhandler.exe
Token: SeSystemProfilePrivilege	1744	Errorhandler.exe
Token: SeSystemtimePrivilege	1744	Errorhandler.exe
Token: SeProfSingleProcessPrivilege	1744	Errorhandler.exe
Token: SeIncBasePriorityPrivilege	1744	Errorhandler.exe
Token: SeCreatePagefilePrivilege	1744	Errorhandler.exe
Token: SeBackupPrivilege	1744	Errorhandler.exe
Token: SeRestorePrivilege	1744	Errorhandler.exe
Token: SeShutdownPrivilege	1744	Errorhandler.exe
Token: SeDebugPrivilege	1744	Errorhandler.exe
Token: SeSystemEnvironmentPrivilege	1744	Errorhandler.exe
Token: SeChangeNotifyPrivilege	1744	Errorhandler.exe
Token: SeRemoteShutdownPrivilege	1744	Errorhandler.exe
Token: SeUndockPrivilege	1744	Errorhandler.exe
Token: SeManageVolumePrivilege	1744	Errorhandler.exe
Token: SeImpersonatePrivilege	1744	Errorhandler.exe
Token: SeCreateGlobalPrivilege	1744	Errorhandler.exe
Token: 33	1744	Errorhandler.exe
Token: 34	1744	Errorhandler.exe
Token: 35	1744	Errorhandler.exe
Token: 36	1744	Errorhandler.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1744	Errorhandler.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3764 wrote to memory of 1744	3764	Handler.exe	83
PID 3764 wrote to memory of 1744	3764	Handler.exe	83
PID 3764 wrote to memory of 1744	3764	Handler.exe	83
PID 1744 wrote to memory of 4468	1744	Errorhandler.exe	84
PID 1744 wrote to memory of 4468	1744	Errorhandler.exe	84
PID 1744 wrote to memory of 4468	1744	Errorhandler.exe	84
PID 1744 wrote to memory of 3864	1744	Errorhandler.exe	85
PID 1744 wrote to memory of 3864	1744	Errorhandler.exe	85
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86
PID 1744 wrote to memory of 3084	1744	Errorhandler.exe	86

C:\Users\Admin\AppData\Local\Temp\Handler.exe
"C:\Users\Admin\AppData\Local\Temp\Handler.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3764
- C:\Users\Admin\Documents\Bloxstrap\Errorhandler.exe
  "C:\Users\Admin\Documents\Bloxstrap\Errorhandler.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1744
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
    3⤵
    PID:4468
- - C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    3⤵
    PID:3864
- - C:\Windows\SysWOW64\notepad.exe
    notepad
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3084

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\Documents\Bloxstrap\Errorhandler.exe

Filesize
253KB

MD5
9877f2250a1b6f72beedd0cf71b90a6c

SHA1
c8e179559e1d7839ff1078b0685b798ecfc0f8f2

SHA256
19f4bb3e5785aa78e2e97d59b93fa396636d1d6c9eff94ea8dee21c0b55e2c45

SHA512
a1c65f2c0568444f9e5f2f119810c7d4ca3dbd7b1673edd5235e7be4a316e929c608f2e441860da909d1c120c20b5cab44d6bacaa4db076c0b30f5c832936979

Download Submit
memory/1744-17-0x00000000006D0000-0x00000000006D1000-memory.dmp

Filesize
4KB

Download
memory/1744-19-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/1744-22-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/3084-18-0x0000000001160000-0x0000000001161000-memory.dmp

Filesize
4KB

Download
memory/3764-0-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/3764-1-0x0000000000B20000-0x0000000000B21000-memory.dmp

Filesize
4KB

Download
memory/3764-16-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download