skuld | 220e33c37d55d41322c6af19fcff7c27a1eadcee6ef3b073b0b50b2f92c71ba3

General

Target

CBLines.exe
Size

9.9MB
MD5

4aceefe0841c85a6e41790ed1b7e4dc4
SHA1

b8a098ea10749eb910fe6f69f91d6bee8583c79e
SHA256

220e33c37d55d41322c6af19fcff7c27a1eadcee6ef3b073b0b50b2f92c71ba3
SHA512

6b96aafa9d6691b98981cd7643df9c5709d3d514d84aadb97617d9d1bf443ab6f02ece6bfb1797775568876676d9db14c5efe4750d54b4053def8b53c7fc78f7
SSDEEP

98304:1hQI9wzKxmhMIIKfGTibiyCC9cK8JE2ICafZmwjsEejd:1hIzKxmhhtbiyCicRKDUjd

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1293364712645328977/QVy4b8FCf4VcBd2eWmc6pU5PSC_CW9FSbBynWkMJuDBQltuQ0VS7786OwjG1V_kxgMuP

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-1-5-21-4089630652-1596403869-279772308-1000\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

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

Processes:

description flow ioc

HTTP User-Agent header 11 Go-http-client/1.1

flow	ioc
10	ip-api.com
1	api.ipify.org
2	api.ipify.org

description	flow	ioc
HTTP User-Agent header	11	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	2056	CBLines.exe
Token: SeIncreaseQuotaPrivilege	544	wmic.exe
Token: SeSecurityPrivilege	544	wmic.exe
Token: SeTakeOwnershipPrivilege	544	wmic.exe
Token: SeLoadDriverPrivilege	544	wmic.exe
Token: SeSystemProfilePrivilege	544	wmic.exe
Token: SeSystemtimePrivilege	544	wmic.exe
Token: SeProfSingleProcessPrivilege	544	wmic.exe
Token: SeIncBasePriorityPrivilege	544	wmic.exe
Token: SeCreatePagefilePrivilege	544	wmic.exe
Token: SeBackupPrivilege	544	wmic.exe
Token: SeRestorePrivilege	544	wmic.exe
Token: SeShutdownPrivilege	544	wmic.exe
Token: SeDebugPrivilege	544	wmic.exe
Token: SeSystemEnvironmentPrivilege	544	wmic.exe
Token: SeRemoteShutdownPrivilege	544	wmic.exe
Token: SeUndockPrivilege	544	wmic.exe
Token: SeManageVolumePrivilege	544	wmic.exe
Token: 33	544	wmic.exe
Token: 34	544	wmic.exe
Token: 35	544	wmic.exe
Token: 36	544	wmic.exe
Token: SeIncreaseQuotaPrivilege	544	wmic.exe
Token: SeSecurityPrivilege	544	wmic.exe
Token: SeTakeOwnershipPrivilege	544	wmic.exe
Token: SeLoadDriverPrivilege	544	wmic.exe
Token: SeSystemProfilePrivilege	544	wmic.exe
Token: SeSystemtimePrivilege	544	wmic.exe
Token: SeProfSingleProcessPrivilege	544	wmic.exe
Token: SeIncBasePriorityPrivilege	544	wmic.exe
Token: SeCreatePagefilePrivilege	544	wmic.exe
Token: SeBackupPrivilege	544	wmic.exe
Token: SeRestorePrivilege	544	wmic.exe
Token: SeShutdownPrivilege	544	wmic.exe
Token: SeDebugPrivilege	544	wmic.exe
Token: SeSystemEnvironmentPrivilege	544	wmic.exe
Token: SeRemoteShutdownPrivilege	544	wmic.exe
Token: SeUndockPrivilege	544	wmic.exe
Token: SeManageVolumePrivilege	544	wmic.exe
Token: 33	544	wmic.exe
Token: 34	544	wmic.exe
Token: 35	544	wmic.exe
Token: 36	544	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

CBLines.exe

description	pid	process	target process
PID 2056 wrote to memory of 4904	2056	CBLines.exe	attrib.exe
PID 2056 wrote to memory of 4904	2056	CBLines.exe	attrib.exe
PID 2056 wrote to memory of 4416	2056	CBLines.exe	attrib.exe
PID 2056 wrote to memory of 4416	2056	CBLines.exe	attrib.exe
PID 2056 wrote to memory of 544	2056	CBLines.exe	wmic.exe
PID 2056 wrote to memory of 544	2056	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

4904 attrib.exe
4416 attrib.exe

pid	process
4904	attrib.exe
4416	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:2056
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\CBLines.exe
  2⤵
  - Views/modifies file attributes
  PID:4904
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:4416
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:544

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
4aceefe0841c85a6e41790ed1b7e4dc4

SHA1
b8a098ea10749eb910fe6f69f91d6bee8583c79e

SHA256
220e33c37d55d41322c6af19fcff7c27a1eadcee6ef3b073b0b50b2f92c71ba3

SHA512
6b96aafa9d6691b98981cd7643df9c5709d3d514d84aadb97617d9d1bf443ab6f02ece6bfb1797775568876676d9db14c5efe4750d54b4053def8b53c7fc78f7

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads