darkcomet | bdca22b50a716ac1106fce8eb7fbb0df989bbf381329e952d16be68dc01c6477

Analysis

max time kernel
151s
max time network
147s
platform
windows7_x64
resource
win7v20201028
submitted
17/11/2020, 11:40

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General

Target
417dd0fc267b52a099e6d21e2f587448.exe
Size 252KB
Sample201117-ff5v78ch1x
SHA256 bdca22b50a716ac1106fce8eb7fbb0df989bbf381329e952d16be68dc01c6477
MD5 d87a0b6ff3b80619eff6a91dcbbc92f2
SHA1 2bd496d9718547ba4ff87aab82ef78e7d020b586
SHA512 da4d7b6ddb9ac15f82ed0e9452e4e90e474c3b22a2b4eb859f3e34033676d1e6e117278a1c65a22ba27a3ba4199c8b5334b8d036d139a3e5071f917c8026df1e
MD5 SHA1 SHA512

Score

10^/10

darkcomet guest16 evasion persistence rat trojan upx

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

batchlove.hopto.org:1605

Mutex

DC_MUTEX-Y0UZCZQ

Attributes

InstallPath
MSDCSC\msdcsc.exe
gencode
KmnWlesUz91w
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:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	417dd0fc267b52a099e6d21e2f587448.exe

Modifies firewall policy service 2 TTPs 6 IoCs

evasion

Modify Registry

T1112

Modify Existing Service

T1031

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\DisableNotifications = "0"	iexplore.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile	msdcsc.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "0"	msdcsc.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\DisableNotifications = "0"	msdcsc.exe
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile	iexplore.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "0"	iexplore.exe

Modifies security service 2 TTPs 2 IoCs

evasion

Modify Registry

T1112

Modify Existing Service

T1031

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wscsvc\Start = "4"	msdcsc.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wscsvc\Start = "4"	iexplore.exe

Windows security bypass 2 TTPs
evasion trojan

Disabling Security Tools
T1089

Modify Registry
T1112
Disables RegEdit via registry modification
evasion
Disables Task Manager via registry modification
evasion

Executes dropped EXE 1 IoCs

pid	Process
1740	msdcsc.exe

Sets file to hidden 1 TTPs
Modifies file attributes to stop it showing in Explorer etc.
evasion

Hidden Files and Directories
T1158

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral1/files/0x00040000000130fe-4.dat	upx
behavioral1/files/0x00040000000130fe-5.dat	upx
behavioral1/files/0x00040000000130fe-7.dat	upx
behavioral1/files/0x00040000000130fe-8.dat	upx
behavioral1/memory/1724-9-0x0000000000400000-0x00000000004B7000-memory.dmp	upx
behavioral1/memory/1724-11-0x0000000000400000-0x00000000004B7000-memory.dmp	upx
behavioral1/memory/1724-12-0x0000000000400000-0x00000000004B7000-memory.dmp	upx

Loads dropped DLL 2 IoCs

pid	Process
1960	417dd0fc267b52a099e6d21e2f587448.exe
1960	417dd0fc267b52a099e6d21e2f587448.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	msdcsc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	msdcsc.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	417dd0fc267b52a099e6d21e2f587448.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	msdcsc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	iexplore.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1740 set thread context of 1724	1740	msdcsc.exe	33

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
1724	iexplore.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSecurityPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeTakeOwnershipPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeLoadDriverPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSystemProfilePrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSystemtimePrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeProfSingleProcessPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeIncBasePriorityPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeCreatePagefilePrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeBackupPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeRestorePrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeShutdownPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeDebugPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSystemEnvironmentPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeChangeNotifyPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeRemoteShutdownPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeUndockPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeManageVolumePrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeImpersonatePrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeCreateGlobalPrivilege	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: 33	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: 34	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: 35	1960	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeIncreaseQuotaPrivilege	1740	msdcsc.exe
Token: SeSecurityPrivilege	1740	msdcsc.exe
Token: SeTakeOwnershipPrivilege	1740	msdcsc.exe
Token: SeLoadDriverPrivilege	1740	msdcsc.exe
Token: SeSystemProfilePrivilege	1740	msdcsc.exe
Token: SeSystemtimePrivilege	1740	msdcsc.exe
Token: SeProfSingleProcessPrivilege	1740	msdcsc.exe
Token: SeIncBasePriorityPrivilege	1740	msdcsc.exe
Token: SeCreatePagefilePrivilege	1740	msdcsc.exe
Token: SeBackupPrivilege	1740	msdcsc.exe
Token: SeRestorePrivilege	1740	msdcsc.exe
Token: SeShutdownPrivilege	1740	msdcsc.exe
Token: SeDebugPrivilege	1740	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	1740	msdcsc.exe
Token: SeChangeNotifyPrivilege	1740	msdcsc.exe
Token: SeRemoteShutdownPrivilege	1740	msdcsc.exe
Token: SeUndockPrivilege	1740	msdcsc.exe
Token: SeManageVolumePrivilege	1740	msdcsc.exe
Token: SeImpersonatePrivilege	1740	msdcsc.exe
Token: SeCreateGlobalPrivilege	1740	msdcsc.exe
Token: 33	1740	msdcsc.exe
Token: 34	1740	msdcsc.exe
Token: 35	1740	msdcsc.exe
Token: SeIncreaseQuotaPrivilege	1724	iexplore.exe
Token: SeSecurityPrivilege	1724	iexplore.exe
Token: SeTakeOwnershipPrivilege	1724	iexplore.exe
Token: SeLoadDriverPrivilege	1724	iexplore.exe
Token: SeSystemProfilePrivilege	1724	iexplore.exe
Token: SeSystemtimePrivilege	1724	iexplore.exe
Token: SeProfSingleProcessPrivilege	1724	iexplore.exe
Token: SeIncBasePriorityPrivilege	1724	iexplore.exe
Token: SeCreatePagefilePrivilege	1724	iexplore.exe
Token: SeBackupPrivilege	1724	iexplore.exe
Token: SeRestorePrivilege	1724	iexplore.exe
Token: SeShutdownPrivilege	1724	iexplore.exe
Token: SeDebugPrivilege	1724	iexplore.exe
Token: SeSystemEnvironmentPrivilege	1724	iexplore.exe
Token: SeChangeNotifyPrivilege	1724	iexplore.exe
Token: SeRemoteShutdownPrivilege	1724	iexplore.exe
Token: SeUndockPrivilege	1724	iexplore.exe
Token: SeManageVolumePrivilege	1724	iexplore.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1724	iexplore.exe

Suspicious use of WriteProcessMemory 49 IoCs

description	pid	Process	procid_target
PID 1960 wrote to memory of 1476	1960	417dd0fc267b52a099e6d21e2f587448.exe	26
PID 1960 wrote to memory of 1476	1960	417dd0fc267b52a099e6d21e2f587448.exe	26
PID 1960 wrote to memory of 1476	1960	417dd0fc267b52a099e6d21e2f587448.exe	26
PID 1960 wrote to memory of 1476	1960	417dd0fc267b52a099e6d21e2f587448.exe	26
PID 1960 wrote to memory of 1544	1960	417dd0fc267b52a099e6d21e2f587448.exe	28
PID 1960 wrote to memory of 1544	1960	417dd0fc267b52a099e6d21e2f587448.exe	28
PID 1960 wrote to memory of 1544	1960	417dd0fc267b52a099e6d21e2f587448.exe	28
PID 1960 wrote to memory of 1544	1960	417dd0fc267b52a099e6d21e2f587448.exe	28
PID 1476 wrote to memory of 1948	1476	cmd.exe	30
PID 1476 wrote to memory of 1948	1476	cmd.exe	30
PID 1476 wrote to memory of 1948	1476	cmd.exe	30
PID 1476 wrote to memory of 1948	1476	cmd.exe	30
PID 1544 wrote to memory of 1932	1544	cmd.exe	31
PID 1544 wrote to memory of 1932	1544	cmd.exe	31
PID 1544 wrote to memory of 1932	1544	cmd.exe	31
PID 1544 wrote to memory of 1932	1544	cmd.exe	31
PID 1960 wrote to memory of 1740	1960	417dd0fc267b52a099e6d21e2f587448.exe	32
PID 1960 wrote to memory of 1740	1960	417dd0fc267b52a099e6d21e2f587448.exe	32
PID 1960 wrote to memory of 1740	1960	417dd0fc267b52a099e6d21e2f587448.exe	32
PID 1960 wrote to memory of 1740	1960	417dd0fc267b52a099e6d21e2f587448.exe	32
PID 1740 wrote to memory of 1724	1740	msdcsc.exe	33
PID 1740 wrote to memory of 1724	1740	msdcsc.exe	33
PID 1740 wrote to memory of 1724	1740	msdcsc.exe	33
PID 1740 wrote to memory of 1724	1740	msdcsc.exe	33
PID 1740 wrote to memory of 1724	1740	msdcsc.exe	33
PID 1740 wrote to memory of 1724	1740	msdcsc.exe	33
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34
PID 1724 wrote to memory of 1656	1724	iexplore.exe	34

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion	msdcsc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern	msdcsc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern\NoControlPanel = "1"	msdcsc.exe

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
1948	attrib.exe
1932	attrib.exe

C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe
"C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe"
1⤵
- Modifies WinLogon for persistence
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1960
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe" +s +h
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1476
- - C:\Windows\SysWOW64\attrib.exe
    attrib "C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe" +s +h
    3⤵
    - Views/modifies file attributes
    PID:1948
- 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:1544
- - C:\Windows\SysWOW64\attrib.exe
    attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
    3⤵
    - Views/modifies file attributes
    PID:1932
- C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe
  "C:\ProgramData\Microsoft\Windows\Start Menu\MSDCSC\msdcsc.exe"
  2⤵
  - Modifies firewall policy service
  - Modifies security service
  - Executes dropped EXE
  - Windows security modification
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - System policy modification
  PID:1740
- - C:\Program Files (x86)\Internet Explorer\iexplore.exe
    "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
    3⤵
    - Modifies firewall policy service
    - Modifies security service
    - Adds Run key to start application
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1724
  - - C:\Windows\SysWOW64\notepad.exe
      notepad
      4⤵
      PID:1656

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Hidden Files and Directories

T1158

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Disabling Security Tools

T1089

Hidden Files and Directories

T1158

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1656-14-0x00000000001E0000-0x00000000001E1000-memory.dmp

Download

memory/1724-12-0x0000000000400000-0x00000000004B7000-memory.dmp

Download

memory/1724-11-0x0000000000400000-0x00000000004B7000-memory.dmp

Download

memory/1724-9-0x0000000000400000-0x00000000004B7000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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