darkcomet | 5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2

General

Target

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Size

772KB
MD5

47a3df044a495ed7c6ba76c035a5551d
SHA1

0793db2a77213074fd9b0d494dad66b1368186ba
SHA256

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2
SHA512

7f791219154d97fba2e3d48541f877bb6ee1bd64dc6f63a9ef238cd1161e84994eef85632206d7ccdc0034bd2cb54fcecfdfd4120dc9f79a8b5a26e1cae17617
SSDEEP

12288:cf2GiGMBHqhYOJONtMCesfXlKXeR6z6MMRlcT9cYYIJj0j0zpggnT:/GQFQgkC1PMzIlcZdYIJj0qdT

Score

10^/10

darkcomet 13.07.12 crypter persistence rat trojan upx

Malware Config

Extracted

Family

darkcomet

Botnet

13.07.12 Crypter

C2

leetaka1337.no-ip.org:1604

Mutex

DC_MUTEX-JFX5RP1

Attributes

InstallPath
MSDCSC\winhost.exe
gencode
lCnq6VNbar2M
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

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\system32\\MSDCSC\\winhost.exe"	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

Executes dropped EXE 2 IoCs

Processes:

STUB.EXEwinhost.exe

pid process

1452 STUB.EXE
1788 winhost.exe

pid	process
1452	STUB.EXE
1788	winhost.exe

UPX packed file 5 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/2980-134-0x0000000000400000-0x00000000004C2000-memory.dmp	upx
behavioral2/memory/2980-135-0x0000000000400000-0x00000000004C2000-memory.dmp	upx
behavioral2/memory/2980-136-0x0000000000400000-0x00000000004C2000-memory.dmp	upx
behavioral2/memory/2980-139-0x0000000000400000-0x00000000004C2000-memory.dmp	upx
behavioral2/memory/2980-138-0x0000000000400000-0x00000000004C2000-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

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Windows\\system32\\MSDCSC\\winhost.exe"	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

Drops file in System32 directory 3 IoCs

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

description	ioc	process
File created	C:\Windows\SysWOW64\MSDCSC\winhost.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
File opened for modification	C:\Windows\SysWOW64\MSDCSC\winhost.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
File opened for modification	C:\Windows\SysWOW64\MSDCSC\	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

description	pid	process	target process
PID 4996 set thread context of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.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:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe

Suspicious use of AdjustPrivilegeToken 26 IoCs

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exewinhost.exe

description	pid	process
Token: SeDebugPrivilege	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeIncreaseQuotaPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeSecurityPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeTakeOwnershipPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeLoadDriverPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeSystemProfilePrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeSystemtimePrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeProfSingleProcessPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeIncBasePriorityPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeCreatePagefilePrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeBackupPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeRestorePrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeShutdownPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeDebugPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeSystemEnvironmentPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeChangeNotifyPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeRemoteShutdownPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeUndockPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeManageVolumePrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeImpersonatePrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeCreateGlobalPrivilege	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: 33	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: 34	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: 35	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: 36	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
Token: SeDebugPrivilege	1788	winhost.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exewinhost.exe

description	pid	process	target process
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 4996 wrote to memory of 2980	4996	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
PID 2980 wrote to memory of 1452	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	STUB.EXE
PID 2980 wrote to memory of 1452	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	STUB.EXE
PID 2980 wrote to memory of 1452	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	STUB.EXE
PID 2980 wrote to memory of 1788	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	winhost.exe
PID 2980 wrote to memory of 1788	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	winhost.exe
PID 2980 wrote to memory of 1788	2980	5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe	winhost.exe
PID 1788 wrote to memory of 4352	1788	winhost.exe	winhost.exe
PID 1788 wrote to memory of 4352	1788	winhost.exe	winhost.exe
PID 1788 wrote to memory of 4352	1788	winhost.exe	winhost.exe

C:\Users\Admin\AppData\Local\Temp\5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
"C:\Users\Admin\AppData\Local\Temp\5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4996

C:\Users\Admin\AppData\Local\Temp\5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
C:\Users\Admin\AppData\Local\Temp\5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2.exe
2⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2980

C:\Users\Admin\AppData\Local\Temp\STUB.EXE
"C:\Users\Admin\AppData\Local\Temp\STUB.EXE"
3⤵
- Executes dropped EXE
PID:1452

C:\Windows\SysWOW64\MSDCSC\winhost.exe
"C:\Windows\system32\MSDCSC\winhost.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1788

C:\Windows\SysWOW64\MSDCSC\winhost.exe
C:\Windows\SysWOW64\MSDCSC\winhost.exe
4⤵
PID:4352

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1

T1004

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\STUB.EXE
Filesize
47KB

MD5
6e9ee67b3cceaf1fc3bd53a9c33a3cc7

SHA1
1ce7d9f73b9da92385ec41e416d2cf7a6f2ccc03

SHA256
e9509d87ec53efda131c636fe729180eea8c48850693f0c800fc04f88f5960bb

SHA512
6ee77b3d3238e1507ab83f57fa06b88b384b5d8a804a27d93aab30622166b1bedd4796ec30c8dfca3b9085d41c69fd064014e0a424a79e9e8f15b79c6568fb1c

Download Submit
C:\Users\Admin\AppData\Local\Temp\STUB.EXE
Filesize
47KB

MD5
6e9ee67b3cceaf1fc3bd53a9c33a3cc7

SHA1
1ce7d9f73b9da92385ec41e416d2cf7a6f2ccc03

SHA256
e9509d87ec53efda131c636fe729180eea8c48850693f0c800fc04f88f5960bb

SHA512
6ee77b3d3238e1507ab83f57fa06b88b384b5d8a804a27d93aab30622166b1bedd4796ec30c8dfca3b9085d41c69fd064014e0a424a79e9e8f15b79c6568fb1c

Download Submit
C:\Windows\SysWOW64\MSDCSC\winhost.exe
Filesize
772KB

MD5
47a3df044a495ed7c6ba76c035a5551d

SHA1
0793db2a77213074fd9b0d494dad66b1368186ba

SHA256
5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2

SHA512
7f791219154d97fba2e3d48541f877bb6ee1bd64dc6f63a9ef238cd1161e84994eef85632206d7ccdc0034bd2cb54fcecfdfd4120dc9f79a8b5a26e1cae17617

Download Submit
C:\Windows\SysWOW64\MSDCSC\winhost.exe
Filesize
772KB

MD5
47a3df044a495ed7c6ba76c035a5551d

SHA1
0793db2a77213074fd9b0d494dad66b1368186ba

SHA256
5c85bfa433b776f2505d65d140c16fcf90b4910546b59324f7501272584619b2

SHA512
7f791219154d97fba2e3d48541f877bb6ee1bd64dc6f63a9ef238cd1161e84994eef85632206d7ccdc0034bd2cb54fcecfdfd4120dc9f79a8b5a26e1cae17617

Download Submit
memory/1452-144-0x0000000073860000-0x0000000073E11000-memory.dmp

Filesize
5.7MB

Download
memory/1452-143-0x0000000073860000-0x0000000073E11000-memory.dmp

Filesize
5.7MB

Download
memory/1452-145-0x0000000073860000-0x0000000073E11000-memory.dmp

Filesize
5.7MB

Download
memory/1452-140-0x0000000000000000-mapping.dmp

Download
memory/1788-146-0x0000000000000000-mapping.dmp

Download
memory/1788-150-0x0000000072EB0000-0x0000000073461000-memory.dmp

Filesize
5.7MB

Download
memory/2980-138-0x0000000000400000-0x00000000004C2000-memory.dmp

Filesize
776KB

Download
memory/2980-136-0x0000000000400000-0x00000000004C2000-memory.dmp

Filesize
776KB

Download
memory/2980-135-0x0000000000400000-0x00000000004C2000-memory.dmp

Filesize
776KB

Download
memory/2980-139-0x0000000000400000-0x00000000004C2000-memory.dmp

Filesize
776KB

Download
memory/2980-134-0x0000000000400000-0x00000000004C2000-memory.dmp

Filesize
776KB

Download
memory/2980-133-0x0000000000000000-mapping.dmp

Download
memory/4352-149-0x0000000000000000-mapping.dmp

Download
memory/4996-137-0x0000000074740000-0x0000000074CF1000-memory.dmp

Filesize
5.7MB

Download
memory/4996-132-0x0000000074740000-0x0000000074CF1000-memory.dmp

Filesize
5.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads