darkcomet | 61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc

Analysis

max time kernel
151s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
30-07-2022 20:29

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General

Target

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Size

658KB
MD5

674f4d8ef4964657adf1aa84d1a4bd22
SHA1

fd837d847f4840edb6cc1218f1ea59a7813bfc96
SHA256

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc
SHA512

eea4f665c5233d8ecfaecf3fbc59b52d9a5dc62b8ce4d2c17c261d53d75841756df27a1f1ae96d63bcade4bd6213599d92f975d5df809b7669a47ca4a7126d84

Score

10^/10

darkcomet guest16 evasion persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

cometka321.ddns.net:1604

Mutex

DC_MUTEX-JZ5G2G4

Attributes

InstallPath
Windows\msdcsc.exe
gencode
TjzE59HsqfK5
install
true
offline_keylogger
true
persistence
true
reg_key
WindowsUpdate

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

Processes:

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\AppData\\Local\\Temp\\Windows\\msdcsc.exe"	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe

Modifies firewall policy service 2 TTPs 3 IoCs

evasion

Modify Registry

T1112

Modify Existing Service

T1031

Processes:

msdcsc.exe

description	ioc	process
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	msdcsc.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "0"	msdcsc.exe

Modifies security service 2 TTPs 1 IoCs
evasion

Modify Registry
T1112

Modify Existing Service
T1031

Processes:

msdcsc.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wscsvc\Start = "4" msdcsc.exe

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

Windows security bypass 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

msdcsc.exe

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

Disables RegEdit via registry modification 1 IoCs

evasion

Processes:

msdcsc.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	msdcsc.exe

Disables Task Manager via registry modification
evasion
Executes dropped EXE 1 IoCs

Processes:

msdcsc.exe

pid process

4652 msdcsc.exe
Sets file to hidden 1 TTPs 2 IoCs
Modifies file attributes to stop it showing in Explorer etc.
evasion

Hidden Files and Directories
T1158

Processes:

attrib.exeattrib.exe

pid process

2496 attrib.exe
4948 attrib.exe

pid	process
4652	msdcsc.exe

pid	process
2496	attrib.exe
4948	attrib.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

Processes:

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\Control Panel\International\Geo\Nation	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

msdcsc.exe

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 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exemsdcsc.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Windows\\msdcsc.exe"	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2660308776-3705150086-26593515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Windows\\msdcsc.exe"	msdcsc.exe

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

Processes:

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

msdcsc.exe

pid process

4652 msdcsc.exe

pid	process
4652	msdcsc.exe

Suspicious use of AdjustPrivilegeToken 48 IoCs

Processes:

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exemsdcsc.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeSecurityPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeTakeOwnershipPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeLoadDriverPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeSystemProfilePrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeSystemtimePrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeProfSingleProcessPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeIncBasePriorityPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeCreatePagefilePrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeBackupPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeRestorePrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeShutdownPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeDebugPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeSystemEnvironmentPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeChangeNotifyPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeRemoteShutdownPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeUndockPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeManageVolumePrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeImpersonatePrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeCreateGlobalPrivilege	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: 33	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: 34	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: 35	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: 36	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
Token: SeIncreaseQuotaPrivilege	4652	msdcsc.exe
Token: SeSecurityPrivilege	4652	msdcsc.exe
Token: SeTakeOwnershipPrivilege	4652	msdcsc.exe
Token: SeLoadDriverPrivilege	4652	msdcsc.exe
Token: SeSystemProfilePrivilege	4652	msdcsc.exe
Token: SeSystemtimePrivilege	4652	msdcsc.exe
Token: SeProfSingleProcessPrivilege	4652	msdcsc.exe
Token: SeIncBasePriorityPrivilege	4652	msdcsc.exe
Token: SeCreatePagefilePrivilege	4652	msdcsc.exe
Token: SeBackupPrivilege	4652	msdcsc.exe
Token: SeRestorePrivilege	4652	msdcsc.exe
Token: SeShutdownPrivilege	4652	msdcsc.exe
Token: SeDebugPrivilege	4652	msdcsc.exe
Token: SeSystemEnvironmentPrivilege	4652	msdcsc.exe
Token: SeChangeNotifyPrivilege	4652	msdcsc.exe
Token: SeRemoteShutdownPrivilege	4652	msdcsc.exe
Token: SeUndockPrivilege	4652	msdcsc.exe
Token: SeManageVolumePrivilege	4652	msdcsc.exe
Token: SeImpersonatePrivilege	4652	msdcsc.exe
Token: SeCreateGlobalPrivilege	4652	msdcsc.exe
Token: 33	4652	msdcsc.exe
Token: 34	4652	msdcsc.exe
Token: 35	4652	msdcsc.exe
Token: 36	4652	msdcsc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

msdcsc.exe

pid process

4652 msdcsc.exe

pid	process
4652	msdcsc.exe

Suspicious use of WriteProcessMemory 37 IoCs

Processes:

61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.execmd.execmd.exemsdcsc.exe

description	pid	process	target process
PID 4244 wrote to memory of 4340	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	cmd.exe
PID 4244 wrote to memory of 4340	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	cmd.exe
PID 4244 wrote to memory of 4340	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	cmd.exe
PID 4244 wrote to memory of 2436	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	cmd.exe
PID 4244 wrote to memory of 2436	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	cmd.exe
PID 4244 wrote to memory of 2436	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	cmd.exe
PID 4340 wrote to memory of 2496	4340	cmd.exe	attrib.exe
PID 4340 wrote to memory of 2496	4340	cmd.exe	attrib.exe
PID 4340 wrote to memory of 2496	4340	cmd.exe	attrib.exe
PID 2436 wrote to memory of 4948	2436	cmd.exe	attrib.exe
PID 2436 wrote to memory of 4948	2436	cmd.exe	attrib.exe
PID 2436 wrote to memory of 4948	2436	cmd.exe	attrib.exe
PID 4244 wrote to memory of 4652	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	msdcsc.exe
PID 4244 wrote to memory of 4652	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	msdcsc.exe
PID 4244 wrote to memory of 4652	4244	61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe	msdcsc.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe
PID 4652 wrote to memory of 3520	4652	msdcsc.exe	notepad.exe

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

Processes:

msdcsc.exe

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

Processes:

attrib.exeattrib.exe

pid process

2496 attrib.exe
4948 attrib.exe

pid	process
2496	attrib.exe
4948	attrib.exe

C:\Users\Admin\AppData\Local\Temp\61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe
"C:\Users\Admin\AppData\Local\Temp\61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.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:4244

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe" +s +h
2⤵
- Suspicious use of WriteProcessMemory
PID:4340

C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp\61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc.exe" +s +h
3⤵
- Sets file to hidden
- Views/modifies file attributes
PID:2496

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:2436

C:\Windows\SysWOW64\attrib.exe
attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
3⤵
- Sets file to hidden
- Views/modifies file attributes
PID:4948

C:\Users\Admin\AppData\Local\Temp\Windows\msdcsc.exe
"C:\Users\Admin\AppData\Local\Temp\Windows\msdcsc.exe"
2⤵
- Modifies firewall policy service
- Modifies security service
- Windows security bypass
- Disables RegEdit via registry modification
- Executes dropped EXE
- Windows security modification
- Adds Run key to start application
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4652

C:\Windows\SysWOW64\notepad.exe
notepad
3⤵
PID:3520

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Modify Existing Service

T1031

Hidden Files and Directories

T1158

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Disabling Security Tools

T1089

Hidden Files and Directories

T1158

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\Windows\msdcsc.exe
Filesize
658KB

MD5
674f4d8ef4964657adf1aa84d1a4bd22

SHA1
fd837d847f4840edb6cc1218f1ea59a7813bfc96

SHA256
61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc

SHA512
eea4f665c5233d8ecfaecf3fbc59b52d9a5dc62b8ce4d2c17c261d53d75841756df27a1f1ae96d63bcade4bd6213599d92f975d5df809b7669a47ca4a7126d84

Download Submit
C:\Users\Admin\AppData\Local\Temp\Windows\msdcsc.exe
Filesize
658KB

MD5
674f4d8ef4964657adf1aa84d1a4bd22

SHA1
fd837d847f4840edb6cc1218f1ea59a7813bfc96

SHA256
61aa788c92173825ed5c7898d6b475fb7263851324dd2e0051ef6691a42466dc

SHA512
eea4f665c5233d8ecfaecf3fbc59b52d9a5dc62b8ce4d2c17c261d53d75841756df27a1f1ae96d63bcade4bd6213599d92f975d5df809b7669a47ca4a7126d84

Download Submit
memory/2436-131-0x0000000000000000-mapping.dmp

Download
memory/2496-132-0x0000000000000000-mapping.dmp

Download
memory/3520-137-0x0000000000000000-mapping.dmp

Download
memory/4340-130-0x0000000000000000-mapping.dmp

Download
memory/4652-134-0x0000000000000000-mapping.dmp

Download
memory/4948-133-0x0000000000000000-mapping.dmp

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