darkcomet | 9a4238d07b78cedaf9f16693faadaf26e524d37d82989871b7e8875a38c16318

Analysis

max time kernel
150s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
22/12/2024, 20:14

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General

Target
new calc.exe
Size 1.1MB
Sample241222-y1gn2sxpct
SHA256 098aef2de51c227361d72b5607b9ec7fe463d9a185ff5300577e96371c75a69c
MD5 0878b366dd695cc10da365b40f454062
SHA1 c21f65d76421ff06dab8ada263b5aca971a6d899
SHA512 9b8213a3eea6f7fab26796768812a944539c0d2ea449b1354b51a6e71938d280c66babfd823d483c5faf797b86396680f9072bc12e954c5d32ee9fb16607c279
SSDEEP 24576:RQox/GpVEAIT5XRtEyAPqsw97uN+XmxjeU/+sbG:RQoc45XTEyACt7uNHX/zbG
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

darkcomet guest16 aspackv2 discovery evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Attributes

gencode
install
false
offline_keylogger
false
persistence
false

Extracted

Family

darkcomet

Botnet

Guest16

dc2012.ddns.net:77

Mutex

DC_MUTEX-F666ELN

Attributes

InstallPath
MSDCSC\msdcsc.exe
gencode
M472kUGFekzF
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
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:\\Windows\\system32\\MSDCSC\\msdcsc.exe"	STUB.EXE

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

evasion

Hidden Files and Directories

T1564.001

pid	Process
4852	attrib.exe
4656	attrib.exe

ASPack v2.12-2.42 1 IoCs

Detects executables packed with ASPack v2.12-2.42

aspackv2

resource	yara_rule
behavioral2/files/0x000c000000023b9b-4.dat	aspack_v212_v242

Checks computer location settings 2 TTPs 2 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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	new calc.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	STUB.EXE

Executes dropped EXE 3 IoCs

pid	Process
1760	ESBCALCPORT.EXE
3724	STUB.EXE
3456	msdcsc.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Windows\\system32\\MSDCSC\\msdcsc.exe"	STUB.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Windows\\system32\\MSDCSC\\msdcsc.exe"	msdcsc.exe

Drops file in System32 directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\MSDCSC\	STUB.EXE
File created	C:\Windows\SysWOW64\MSDCSC\msdcsc.exe	STUB.EXE
File opened for modification	C:\Windows\SysWOW64\MSDCSC\msdcsc.exe	STUB.EXE

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 9 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	STUB.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msdcsc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	notepad.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	new calc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	ESBCALCPORT.EXE

Suspicious use of AdjustPrivilegeToken 48 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3724	STUB.EXE
Token: SeSecurityPrivilege	3724	STUB.EXE
Token: SeTakeOwnershipPrivilege	3724	STUB.EXE
Token: SeLoadDriverPrivilege	3724	STUB.EXE
Token: SeSystemProfilePrivilege	3724	STUB.EXE
Token: SeSystemtimePrivilege	3724	STUB.EXE
Token: SeProfSingleProcessPrivilege	3724	STUB.EXE
Token: SeIncBasePriorityPrivilege	3724	STUB.EXE
Token: SeCreatePagefilePrivilege	3724	STUB.EXE
Token: SeBackupPrivilege	3724	STUB.EXE
Token: SeRestorePrivilege	3724	STUB.EXE
Token: SeShutdownPrivilege	3724	STUB.EXE
Token: SeDebugPrivilege	3724	STUB.EXE
Token: SeSystemEnvironmentPrivilege	3724	STUB.EXE
Token: SeChangeNotifyPrivilege	3724	STUB.EXE
Token: SeRemoteShutdownPrivilege	3724	STUB.EXE
Token: SeUndockPrivilege	3724	STUB.EXE
Token: SeManageVolumePrivilege	3724	STUB.EXE
Token: SeImpersonatePrivilege	3724	STUB.EXE
Token: SeCreateGlobalPrivilege	3724	STUB.EXE
Token: 33	3724	STUB.EXE
Token: 34	3724	STUB.EXE
Token: 35	3724	STUB.EXE
Token: 36	3724	STUB.EXE
Token: SeIncreaseQuotaPrivilege	3456	msdcsc.exe
Token: SeSecurityPrivilege	3456	msdcsc.exe
Token: SeTakeOwnershipPrivilege	3456	msdcsc.exe
Token: SeLoadDriverPrivilege	3456	msdcsc.exe
Token: SeSystemProfilePrivilege	3456	msdcsc.exe
Token: SeSystemtimePrivilege	3456	msdcsc.exe
Token: SeProfSingleProcessPrivilege	3456	msdcsc.exe
Token: SeIncBasePriorityPrivilege	3456	msdcsc.exe
Token: SeCreatePagefilePrivilege	3456	msdcsc.exe
Token: SeBackupPrivilege	3456	msdcsc.exe
Token: SeRestorePrivilege	3456	msdcsc.exe
Token: SeShutdownPrivilege	3456	msdcsc.exe
Token: SeDebugPrivilege	3456	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	3456	msdcsc.exe
Token: SeChangeNotifyPrivilege	3456	msdcsc.exe
Token: SeRemoteShutdownPrivilege	3456	msdcsc.exe
Token: SeUndockPrivilege	3456	msdcsc.exe
Token: SeManageVolumePrivilege	3456	msdcsc.exe
Token: SeImpersonatePrivilege	3456	msdcsc.exe
Token: SeCreateGlobalPrivilege	3456	msdcsc.exe
Token: 33	3456	msdcsc.exe
Token: 34	3456	msdcsc.exe
Token: 35	3456	msdcsc.exe
Token: 36	3456	msdcsc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3456	msdcsc.exe

Suspicious use of WriteProcessMemory 45 IoCs

description	pid	Process	procid_target
PID 1620 wrote to memory of 1760	1620	new calc.exe	83
PID 1620 wrote to memory of 1760	1620	new calc.exe	83
PID 1620 wrote to memory of 1760	1620	new calc.exe	83
PID 1620 wrote to memory of 3724	1620	new calc.exe	84
PID 1620 wrote to memory of 3724	1620	new calc.exe	84
PID 1620 wrote to memory of 3724	1620	new calc.exe	84
PID 1760 wrote to memory of 3204	1760	ESBCALCPORT.EXE	85
PID 1760 wrote to memory of 3204	1760	ESBCALCPORT.EXE	85
PID 3724 wrote to memory of 1676	3724	STUB.EXE	86
PID 3724 wrote to memory of 1676	3724	STUB.EXE	86
PID 3724 wrote to memory of 1676	3724	STUB.EXE	86
PID 3724 wrote to memory of 4416	3724	STUB.EXE	87
PID 3724 wrote to memory of 4416	3724	STUB.EXE	87
PID 3724 wrote to memory of 4416	3724	STUB.EXE	87
PID 3724 wrote to memory of 3456	3724	STUB.EXE	89
PID 3724 wrote to memory of 3456	3724	STUB.EXE	89
PID 3724 wrote to memory of 3456	3724	STUB.EXE	89
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 3456 wrote to memory of 3616	3456	msdcsc.exe	92
PID 1676 wrote to memory of 4852	1676	cmd.exe	93
PID 1676 wrote to memory of 4852	1676	cmd.exe	93
PID 1676 wrote to memory of 4852	1676	cmd.exe	93
PID 4416 wrote to memory of 4656	4416	cmd.exe	94
PID 4416 wrote to memory of 4656	4416	cmd.exe	94
PID 4416 wrote to memory of 4656	4416	cmd.exe	94

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4852	attrib.exe
4656	attrib.exe

C:\Users\Admin\AppData\Local\Temp\new calc.exe
"C:\Users\Admin\AppData\Local\Temp\new calc.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1620
- C:\Users\Admin\AppData\Roaming\ESBCALCPORT.EXE
  "C:\Users\Admin\AppData\Roaming\ESBCALCPORT.EXE"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1760
- - C:\Windows\splwow64.exe
    C:\Windows\splwow64.exe 12288
    3⤵
    PID:3204
- C:\Users\Admin\AppData\Roaming\STUB.EXE
  "C:\Users\Admin\AppData\Roaming\STUB.EXE"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3724
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Roaming\STUB.EXE" +s +h
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:1676
  - - C:\Windows\SysWOW64\attrib.exe
      attrib "C:\Users\Admin\AppData\Roaming\STUB.EXE" +s +h
      4⤵
      Sets file to hidden
      System Location Discovery: System Language Discovery
      Views/modifies file attributes
      PID:4852
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Roaming" +s +h
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4416
  - - C:\Windows\SysWOW64\attrib.exe
      attrib "C:\Users\Admin\AppData\Roaming" +s +h
      4⤵
      Sets file to hidden
      System Location Discovery: System Language Discovery
      Views/modifies file attributes
      PID:4656
- - C:\Windows\SysWOW64\MSDCSC\msdcsc.exe
    "C:\Windows\system32\MSDCSC\msdcsc.exe"
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:3456
  - - C:\Windows\SysWOW64\notepad.exe
      notepad
      4⤵
      System Location Discovery: System Language Discovery
      PID:3616

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k PrintWorkflow -s PrintWorkflowUserSvc
1⤵
PID:2156

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

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

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

ESBCALCPORT.EXE

Path C:\Users\Admin\AppData\Roaming\ESBCALCPORT.EXE
Size 836KB
SHA256 d66c32f7016280c5e413222cae5406b462d72d7228037e8adc8239420d5a5df0
MD5 4ecf1d1915f6c16a1d80fabb5ed8ad25
SHA1 e29b5b807f111b7eb3108eb113bed845352f94bd
SHA512 1b9d7ed66047961681f5de58a14a3e328a4f1c90835fd2d1ccbcd03cb1344852251960dd01fd46d9e31175702110e99c3d1abf646f025f9a931075fa69049d1e
SSDEEP 24576:rox/GpVEAIT5XRtEyAPqsw97uN+XmxjeU/+:roc45XTEyACt7uNHX/+
MD5 SHA1 SHA512 SSDEEP

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STUB.EXE

Path C:\Users\Admin\AppData\Roaming\STUB.EXE
Size 235KB
SHA256 9f857811dffa0fd8d08f1053caed8aed94a7ac79b541ba44189cea0887e415de
MD5 92125c8bd0623f4ae5fb220d261bfc3b
SHA1 3e0b2ddc4a56c747e998afc4c631ffe1ca663703
SHA512 396d5cab185bffe5fb466471fffc0b89afe1a938136bc133105d25c211f58b6e48b6742603aeb8d13d0e32e4eaaeedc8b9b0729f016a3f89cd7f405c3a695303
SSDEEP 3072:oY/ygXnCQUYy9yxhjrSsplyU5iHquGbT47mJaCki/q/7NRgOYromMD8goZ9yz28I:oYLtU7Ixhnhz5TN6mJWd/7qMD8gmggf
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1760-47-0x0000000000400000-0x00000000006DB000-memory.dmp

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memory/1760-46-0x00000000008F0000-0x00000000008F1000-memory.dmp

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memory/1760-28-0x00000000008F0000-0x00000000008F1000-memory.dmp

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memory/1760-24-0x0000000000400000-0x00000000006DB000-memory.dmp

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memory/1760-23-0x0000000000400000-0x00000000006DB000-memory.dmp

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memory/1760-22-0x0000000000400000-0x00000000006DB000-memory.dmp

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memory/1760-21-0x0000000000400000-0x00000000006DB000-memory.dmp

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memory/1760-14-0x0000000000400000-0x00000000006DB000-memory.dmp

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memory/3456-67-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-55-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-75-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-42-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-73-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-49-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-71-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-51-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-53-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-69-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-57-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-59-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-61-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-63-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-65-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3456-48-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3616-43-0x0000000000AE0000-0x0000000000AE1000-memory.dmp

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memory/3724-29-0x0000000002170000-0x0000000002171000-memory.dmp

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memory/3724-27-0x0000000000400000-0x00000000004B5000-memory.dmp

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memory/3724-45-0x0000000000400000-0x00000000004B5000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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