skuld | 4cc9f1e397b2077f370e5291afd1a03aac07b1a29e17c88ca2020ae6e695835d

General

Target

CBLines.exe
Size

9.9MB
MD5

6b4262cd05ab0f1db238e89d2bf1d21f
SHA1

affae24bd3cd439c704100de5cd65e5729465284
SHA256

4cc9f1e397b2077f370e5291afd1a03aac07b1a29e17c88ca2020ae6e695835d
SHA512

e2f2e2c655b7992df253ea97a580088e752cd8e74f215782a2ddfe9f184de5109becef5c141c5631c1eb353109d2d2adacd418cea12dbd0014ec0c3e8f843885
SSDEEP

98304:LQI9wzKxmhMIIKfGTibiyCC9cK8IE2ICafZmwjsEejd:LIzKxmhhtbiyCicRhDUjd

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1290038227318865980/yCYkbTRT3dHmHwh66STb09QC7DFgWQqIQ9NBoGoD4vF5IZVQ8EHp1qKqu3aC6746aTSB

Signatures

Skuld stealer
An info stealer written in Go lang.
stealer skuld

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

CBLines.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2718105630-359604950-2820636825-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	CBLines.exe

Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

3 api.ipify.org
4 api.ipify.org
5 ip-api.com
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.

Processes:

description flow ioc

HTTP User-Agent header 6 Go-http-client/1.1

flow	ioc
3	api.ipify.org
4	api.ipify.org
5	ip-api.com

description	flow	ioc
HTTP User-Agent header	6	Go-http-client/1.1

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

Processes:

CBLines.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C	CBLines.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	CBLines.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	CBLines.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

Processes:

CBLines.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	384	CBLines.exe
Token: SeIncreaseQuotaPrivilege	2396	wmic.exe
Token: SeSecurityPrivilege	2396	wmic.exe
Token: SeTakeOwnershipPrivilege	2396	wmic.exe
Token: SeLoadDriverPrivilege	2396	wmic.exe
Token: SeSystemProfilePrivilege	2396	wmic.exe
Token: SeSystemtimePrivilege	2396	wmic.exe
Token: SeProfSingleProcessPrivilege	2396	wmic.exe
Token: SeIncBasePriorityPrivilege	2396	wmic.exe
Token: SeCreatePagefilePrivilege	2396	wmic.exe
Token: SeBackupPrivilege	2396	wmic.exe
Token: SeRestorePrivilege	2396	wmic.exe
Token: SeShutdownPrivilege	2396	wmic.exe
Token: SeDebugPrivilege	2396	wmic.exe
Token: SeSystemEnvironmentPrivilege	2396	wmic.exe
Token: SeRemoteShutdownPrivilege	2396	wmic.exe
Token: SeUndockPrivilege	2396	wmic.exe
Token: SeManageVolumePrivilege	2396	wmic.exe
Token: 33	2396	wmic.exe
Token: 34	2396	wmic.exe
Token: 35	2396	wmic.exe
Token: 36	2396	wmic.exe
Token: SeIncreaseQuotaPrivilege	2396	wmic.exe
Token: SeSecurityPrivilege	2396	wmic.exe
Token: SeTakeOwnershipPrivilege	2396	wmic.exe
Token: SeLoadDriverPrivilege	2396	wmic.exe
Token: SeSystemProfilePrivilege	2396	wmic.exe
Token: SeSystemtimePrivilege	2396	wmic.exe
Token: SeProfSingleProcessPrivilege	2396	wmic.exe
Token: SeIncBasePriorityPrivilege	2396	wmic.exe
Token: SeCreatePagefilePrivilege	2396	wmic.exe
Token: SeBackupPrivilege	2396	wmic.exe
Token: SeRestorePrivilege	2396	wmic.exe
Token: SeShutdownPrivilege	2396	wmic.exe
Token: SeDebugPrivilege	2396	wmic.exe
Token: SeSystemEnvironmentPrivilege	2396	wmic.exe
Token: SeRemoteShutdownPrivilege	2396	wmic.exe
Token: SeUndockPrivilege	2396	wmic.exe
Token: SeManageVolumePrivilege	2396	wmic.exe
Token: 33	2396	wmic.exe
Token: 34	2396	wmic.exe
Token: 35	2396	wmic.exe
Token: 36	2396	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

CBLines.exe

description	pid	process	target process
PID 384 wrote to memory of 3012	384	CBLines.exe	attrib.exe
PID 384 wrote to memory of 3012	384	CBLines.exe	attrib.exe
PID 384 wrote to memory of 632	384	CBLines.exe	attrib.exe
PID 384 wrote to memory of 632	384	CBLines.exe	attrib.exe
PID 384 wrote to memory of 2396	384	CBLines.exe	wmic.exe
PID 384 wrote to memory of 2396	384	CBLines.exe	wmic.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

3012 attrib.exe
632 attrib.exe

pid	process
3012	attrib.exe
632	attrib.exe

C:\Users\Admin\AppData\Local\Temp\CBLines.exe
"C:\Users\Admin\AppData\Local\Temp\CBLines.exe"
1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:384
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\CBLines.exe
  2⤵
  - Views/modifies file attributes
  PID:3012
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:632
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2396

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Hide Artifacts

1

T1564

Hidden Files and Directories

Modify Registry

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe

Filesize
9.9MB

MD5
6b4262cd05ab0f1db238e89d2bf1d21f

SHA1
affae24bd3cd439c704100de5cd65e5729465284

SHA256
4cc9f1e397b2077f370e5291afd1a03aac07b1a29e17c88ca2020ae6e695835d

SHA512
e2f2e2c655b7992df253ea97a580088e752cd8e74f215782a2ddfe9f184de5109becef5c141c5631c1eb353109d2d2adacd418cea12dbd0014ec0c3e8f843885

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads