darkcomet | 19f4bb3e5785aa78e2e97d59b93fa396636d1d6c9eff94ea8dee21c0b55e2c45

Analysis

max time kernel
121s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-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

Executes dropped EXE 1 IoCs

pid	Process
1404	Errorhandler.exe

Loads dropped DLL 2 IoCs

pid	Process
828	Handler.exe
828	Handler.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-1-5-21-1488793075-819845221-1497111674-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\Bloxstrap\\Errorhandler.exe"	Handler.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1404 set thread context of 2696	1404	Errorhandler.exe	32

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/memory/828-0-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral1/files/0x0008000000015ed2-6.dat	upx
behavioral1/memory/1404-17-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral1/memory/828-16-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral1/memory/828-10-0x00000000037E0000-0x000000000389A000-memory.dmp	upx
behavioral1/memory/1404-22-0x0000000000400000-0x00000000004BA000-memory.dmp	upx
behavioral1/memory/2696-20-0x0000000000400000-0x00000000004BA000-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 4 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	iexplore.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	notepad.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe
2696	iexplore.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	828	Handler.exe
Token: SeSecurityPrivilege	828	Handler.exe
Token: SeTakeOwnershipPrivilege	828	Handler.exe
Token: SeLoadDriverPrivilege	828	Handler.exe
Token: SeSystemProfilePrivilege	828	Handler.exe
Token: SeSystemtimePrivilege	828	Handler.exe
Token: SeProfSingleProcessPrivilege	828	Handler.exe
Token: SeIncBasePriorityPrivilege	828	Handler.exe
Token: SeCreatePagefilePrivilege	828	Handler.exe
Token: SeBackupPrivilege	828	Handler.exe
Token: SeRestorePrivilege	828	Handler.exe
Token: SeShutdownPrivilege	828	Handler.exe
Token: SeDebugPrivilege	828	Handler.exe
Token: SeSystemEnvironmentPrivilege	828	Handler.exe
Token: SeChangeNotifyPrivilege	828	Handler.exe
Token: SeRemoteShutdownPrivilege	828	Handler.exe
Token: SeUndockPrivilege	828	Handler.exe
Token: SeManageVolumePrivilege	828	Handler.exe
Token: SeImpersonatePrivilege	828	Handler.exe
Token: SeCreateGlobalPrivilege	828	Handler.exe
Token: 33	828	Handler.exe
Token: 34	828	Handler.exe
Token: 35	828	Handler.exe
Token: SeIncreaseQuotaPrivilege	1404	Errorhandler.exe
Token: SeSecurityPrivilege	1404	Errorhandler.exe
Token: SeTakeOwnershipPrivilege	1404	Errorhandler.exe
Token: SeLoadDriverPrivilege	1404	Errorhandler.exe
Token: SeSystemProfilePrivilege	1404	Errorhandler.exe
Token: SeSystemtimePrivilege	1404	Errorhandler.exe
Token: SeProfSingleProcessPrivilege	1404	Errorhandler.exe
Token: SeIncBasePriorityPrivilege	1404	Errorhandler.exe
Token: SeCreatePagefilePrivilege	1404	Errorhandler.exe
Token: SeBackupPrivilege	1404	Errorhandler.exe
Token: SeRestorePrivilege	1404	Errorhandler.exe
Token: SeShutdownPrivilege	1404	Errorhandler.exe
Token: SeDebugPrivilege	1404	Errorhandler.exe
Token: SeSystemEnvironmentPrivilege	1404	Errorhandler.exe
Token: SeChangeNotifyPrivilege	1404	Errorhandler.exe
Token: SeRemoteShutdownPrivilege	1404	Errorhandler.exe
Token: SeUndockPrivilege	1404	Errorhandler.exe
Token: SeManageVolumePrivilege	1404	Errorhandler.exe
Token: SeImpersonatePrivilege	1404	Errorhandler.exe
Token: SeCreateGlobalPrivilege	1404	Errorhandler.exe
Token: 33	1404	Errorhandler.exe
Token: 34	1404	Errorhandler.exe
Token: 35	1404	Errorhandler.exe
Token: SeIncreaseQuotaPrivilege	2696	iexplore.exe
Token: SeSecurityPrivilege	2696	iexplore.exe
Token: SeTakeOwnershipPrivilege	2696	iexplore.exe
Token: SeLoadDriverPrivilege	2696	iexplore.exe
Token: SeSystemProfilePrivilege	2696	iexplore.exe
Token: SeSystemtimePrivilege	2696	iexplore.exe
Token: SeProfSingleProcessPrivilege	2696	iexplore.exe
Token: SeIncBasePriorityPrivilege	2696	iexplore.exe
Token: SeCreatePagefilePrivilege	2696	iexplore.exe
Token: SeBackupPrivilege	2696	iexplore.exe
Token: SeRestorePrivilege	2696	iexplore.exe
Token: SeShutdownPrivilege	2696	iexplore.exe
Token: SeDebugPrivilege	2696	iexplore.exe
Token: SeSystemEnvironmentPrivilege	2696	iexplore.exe
Token: SeChangeNotifyPrivilege	2696	iexplore.exe
Token: SeRemoteShutdownPrivilege	2696	iexplore.exe
Token: SeUndockPrivilege	2696	iexplore.exe
Token: SeManageVolumePrivilege	2696	iexplore.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2696	iexplore.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 828 wrote to memory of 1404	828	Handler.exe	31
PID 828 wrote to memory of 1404	828	Handler.exe	31
PID 828 wrote to memory of 1404	828	Handler.exe	31
PID 828 wrote to memory of 1404	828	Handler.exe	31
PID 1404 wrote to memory of 2696	1404	Errorhandler.exe	32
PID 1404 wrote to memory of 2696	1404	Errorhandler.exe	32
PID 1404 wrote to memory of 2696	1404	Errorhandler.exe	32
PID 1404 wrote to memory of 2696	1404	Errorhandler.exe	32
PID 1404 wrote to memory of 2696	1404	Errorhandler.exe	32
PID 1404 wrote to memory of 2696	1404	Errorhandler.exe	32
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33
PID 2696 wrote to memory of 2848	2696	iexplore.exe	33

C:\Users\Admin\AppData\Local\Temp\Handler.exe
"C:\Users\Admin\AppData\Local\Temp\Handler.exe"
1⤵
- Modifies WinLogon for persistence
- Loads dropped DLL
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:828
- C:\Users\Admin\Documents\Bloxstrap\Errorhandler.exe
  "C:\Users\Admin\Documents\Bloxstrap\Errorhandler.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1404
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2696
  - - C:\Windows\SysWOW64\notepad.exe
      notepad
      4⤵
      System Location Discovery: System Language Discovery
      PID:2848

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

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

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

Filesize
253KB

MD5
9877f2250a1b6f72beedd0cf71b90a6c

SHA1
c8e179559e1d7839ff1078b0685b798ecfc0f8f2

SHA256
19f4bb3e5785aa78e2e97d59b93fa396636d1d6c9eff94ea8dee21c0b55e2c45

SHA512
a1c65f2c0568444f9e5f2f119810c7d4ca3dbd7b1673edd5235e7be4a316e929c608f2e441860da909d1c120c20b5cab44d6bacaa4db076c0b30f5c832936979

Download Submit
memory/828-0-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/828-1-0x0000000000260000-0x0000000000261000-memory.dmp

Filesize
4KB

Download
memory/828-16-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/828-10-0x00000000037E0000-0x000000000389A000-memory.dmp

Filesize
744KB

Download
memory/828-12-0x00000000037E0000-0x000000000389A000-memory.dmp

Filesize
744KB

Download
memory/1404-17-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/1404-18-0x0000000000260000-0x0000000000261000-memory.dmp

Filesize
4KB

Download
memory/1404-22-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/2696-20-0x0000000000400000-0x00000000004BA000-memory.dmp

Filesize
744KB

Download
memory/2848-23-0x0000000000080000-0x0000000000081000-memory.dmp

Filesize
4KB

Download
memory/2848-53-0x0000000000420000-0x0000000000421000-memory.dmp

Filesize
4KB

Download