darkcomet | bdca22b50a716ac1106fce8eb7fbb0df989bbf381329e952d16be68dc01c6477

Analysis

max time kernel
150s
max time network
140s
platform
windows10_x64
resource
win10v20201028
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
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
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

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
968	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 5 IoCs

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

upx

resource	yara_rule
behavioral2/files/0x000200000001ab8d-5.dat	upx
behavioral2/files/0x000200000001ab8d-6.dat	upx
behavioral2/memory/2764-7-0x0000000000400000-0x00000000004B7000-memory.dmp	upx
behavioral2/memory/2764-9-0x0000000000400000-0x00000000004B7000-memory.dmp	upx
behavioral2/memory/2764-10-0x0000000000400000-0x00000000004B7000-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-1-5-21-3341490333-719741536-2920803124-1000\Control Panel\International\Geo\Nation	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-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	iexplore.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	417dd0fc267b52a099e6d21e2f587448.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3341490333-719741536-2920803124-1000\Software\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\MSDCSC\\msdcsc.exe"	msdcsc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 968 set thread context of 2764	968	msdcsc.exe	82

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance	417dd0fc267b52a099e6d21e2f587448.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2764	iexplore.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSecurityPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeTakeOwnershipPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeLoadDriverPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSystemProfilePrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSystemtimePrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeProfSingleProcessPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeIncBasePriorityPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeCreatePagefilePrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeBackupPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeRestorePrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeShutdownPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeDebugPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeSystemEnvironmentPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeChangeNotifyPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeRemoteShutdownPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeUndockPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeManageVolumePrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeImpersonatePrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeCreateGlobalPrivilege	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: 33	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: 34	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: 35	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: 36	1112	417dd0fc267b52a099e6d21e2f587448.exe
Token: SeIncreaseQuotaPrivilege	968	msdcsc.exe
Token: SeSecurityPrivilege	968	msdcsc.exe
Token: SeTakeOwnershipPrivilege	968	msdcsc.exe
Token: SeLoadDriverPrivilege	968	msdcsc.exe
Token: SeSystemProfilePrivilege	968	msdcsc.exe
Token: SeSystemtimePrivilege	968	msdcsc.exe
Token: SeProfSingleProcessPrivilege	968	msdcsc.exe
Token: SeIncBasePriorityPrivilege	968	msdcsc.exe
Token: SeCreatePagefilePrivilege	968	msdcsc.exe
Token: SeBackupPrivilege	968	msdcsc.exe
Token: SeRestorePrivilege	968	msdcsc.exe
Token: SeShutdownPrivilege	968	msdcsc.exe
Token: SeDebugPrivilege	968	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	968	msdcsc.exe
Token: SeChangeNotifyPrivilege	968	msdcsc.exe
Token: SeRemoteShutdownPrivilege	968	msdcsc.exe
Token: SeUndockPrivilege	968	msdcsc.exe
Token: SeManageVolumePrivilege	968	msdcsc.exe
Token: SeImpersonatePrivilege	968	msdcsc.exe
Token: SeCreateGlobalPrivilege	968	msdcsc.exe
Token: 33	968	msdcsc.exe
Token: 34	968	msdcsc.exe
Token: 35	968	msdcsc.exe
Token: 36	968	msdcsc.exe
Token: SeIncreaseQuotaPrivilege	2764	iexplore.exe
Token: SeSecurityPrivilege	2764	iexplore.exe
Token: SeTakeOwnershipPrivilege	2764	iexplore.exe
Token: SeLoadDriverPrivilege	2764	iexplore.exe
Token: SeSystemProfilePrivilege	2764	iexplore.exe
Token: SeSystemtimePrivilege	2764	iexplore.exe
Token: SeProfSingleProcessPrivilege	2764	iexplore.exe
Token: SeIncBasePriorityPrivilege	2764	iexplore.exe
Token: SeCreatePagefilePrivilege	2764	iexplore.exe
Token: SeBackupPrivilege	2764	iexplore.exe
Token: SeRestorePrivilege	2764	iexplore.exe
Token: SeShutdownPrivilege	2764	iexplore.exe
Token: SeDebugPrivilege	2764	iexplore.exe
Token: SeSystemEnvironmentPrivilege	2764	iexplore.exe
Token: SeChangeNotifyPrivilege	2764	iexplore.exe
Token: SeRemoteShutdownPrivilege	2764	iexplore.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2764	iexplore.exe

Suspicious use of WriteProcessMemory 42 IoCs

description	pid	Process	procid_target
PID 1112 wrote to memory of 3876	1112	417dd0fc267b52a099e6d21e2f587448.exe	75
PID 1112 wrote to memory of 3876	1112	417dd0fc267b52a099e6d21e2f587448.exe	75
PID 1112 wrote to memory of 3876	1112	417dd0fc267b52a099e6d21e2f587448.exe	75
PID 1112 wrote to memory of 3220	1112	417dd0fc267b52a099e6d21e2f587448.exe	76
PID 1112 wrote to memory of 3220	1112	417dd0fc267b52a099e6d21e2f587448.exe	76
PID 1112 wrote to memory of 3220	1112	417dd0fc267b52a099e6d21e2f587448.exe	76
PID 3876 wrote to memory of 3244	3876	cmd.exe	79
PID 3876 wrote to memory of 3244	3876	cmd.exe	79
PID 3876 wrote to memory of 3244	3876	cmd.exe	79
PID 3220 wrote to memory of 420	3220	cmd.exe	80
PID 3220 wrote to memory of 420	3220	cmd.exe	80
PID 3220 wrote to memory of 420	3220	cmd.exe	80
PID 1112 wrote to memory of 968	1112	417dd0fc267b52a099e6d21e2f587448.exe	81
PID 1112 wrote to memory of 968	1112	417dd0fc267b52a099e6d21e2f587448.exe	81
PID 1112 wrote to memory of 968	1112	417dd0fc267b52a099e6d21e2f587448.exe	81
PID 968 wrote to memory of 2764	968	msdcsc.exe	82
PID 968 wrote to memory of 2764	968	msdcsc.exe	82
PID 968 wrote to memory of 2764	968	msdcsc.exe	82
PID 968 wrote to memory of 2764	968	msdcsc.exe	82
PID 968 wrote to memory of 2764	968	msdcsc.exe	82
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84
PID 2764 wrote to memory of 3236	2764	iexplore.exe	84

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

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

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1158

pid	Process
3244	attrib.exe
420	attrib.exe

C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe
"C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1112
- 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:3876
- - C:\Windows\SysWOW64\attrib.exe
    attrib "C:\Users\Admin\AppData\Local\Temp\417dd0fc267b52a099e6d21e2f587448.exe" +s +h
    3⤵
    - Views/modifies file attributes
    PID:3244
- 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:3220
- - C:\Windows\SysWOW64\attrib.exe
    attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
    3⤵
    - Views/modifies file attributes
    PID:420
- 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:968
- - 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:2764
  - - C:\Windows\SysWOW64\notepad.exe
      notepad
      4⤵
      PID:3236

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

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2764-7-0x0000000000400000-0x00000000004B7000-memory.dmp

Download

memory/2764-9-0x0000000000400000-0x00000000004B7000-memory.dmp

Download

memory/2764-10-0x0000000000400000-0x00000000004B7000-memory.dmp

Download

memory/3236-12-0x0000000000730000-0x0000000000731000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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