skuld | f596fc4e9e9568c7fe0cac3b46d5e23932062cadc20f1c055f2ac2ab884bd00a

General

Target

cmd.exe
Size

9.9MB
MD5

240ff0a244a7a888a0df074b70473063
SHA1

85be735983e86eb656a920dde212fc5d467d642c
SHA256

f596fc4e9e9568c7fe0cac3b46d5e23932062cadc20f1c055f2ac2ab884bd00a
SHA512

83ea2029ea67799889cb3b088bb717fc41a1db85819ca42078de57aa0fb6cc66b578e6642a84d9ac0fb26cd3897ed1cd046e7818d0e79394ee6f149fbb1c2c4d
SSDEEP

98304:pzU4brhxBASgf/gEpiji6Ig8TWApEIICafZm/mbnXg:pxrhxBAGZji6IdThqRTXg

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1303801444024979538/ccYtBFXL53k2JjPdccF4_Q0RyJhiTuYgSfRuahpcQBQF-lyG_YEYV7JcEsJ-czgGGLml

Signatures

Skuld family
skuld
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:

cmd.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	cmd.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

4 api.ipify.org
5 ip-api.com
3 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 6 Go-http-client/1.1

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

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:

cmd.exe

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

Suspicious use of AdjustPrivilegeToken 43 IoCs

Processes:

cmd.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	4740	cmd.exe
Token: SeIncreaseQuotaPrivilege	4472	wmic.exe
Token: SeSecurityPrivilege	4472	wmic.exe
Token: SeTakeOwnershipPrivilege	4472	wmic.exe
Token: SeLoadDriverPrivilege	4472	wmic.exe
Token: SeSystemProfilePrivilege	4472	wmic.exe
Token: SeSystemtimePrivilege	4472	wmic.exe
Token: SeProfSingleProcessPrivilege	4472	wmic.exe
Token: SeIncBasePriorityPrivilege	4472	wmic.exe
Token: SeCreatePagefilePrivilege	4472	wmic.exe
Token: SeBackupPrivilege	4472	wmic.exe
Token: SeRestorePrivilege	4472	wmic.exe
Token: SeShutdownPrivilege	4472	wmic.exe
Token: SeDebugPrivilege	4472	wmic.exe
Token: SeSystemEnvironmentPrivilege	4472	wmic.exe
Token: SeRemoteShutdownPrivilege	4472	wmic.exe
Token: SeUndockPrivilege	4472	wmic.exe
Token: SeManageVolumePrivilege	4472	wmic.exe
Token: 33	4472	wmic.exe
Token: 34	4472	wmic.exe
Token: 35	4472	wmic.exe
Token: 36	4472	wmic.exe
Token: SeIncreaseQuotaPrivilege	4472	wmic.exe
Token: SeSecurityPrivilege	4472	wmic.exe
Token: SeTakeOwnershipPrivilege	4472	wmic.exe
Token: SeLoadDriverPrivilege	4472	wmic.exe
Token: SeSystemProfilePrivilege	4472	wmic.exe
Token: SeSystemtimePrivilege	4472	wmic.exe
Token: SeProfSingleProcessPrivilege	4472	wmic.exe
Token: SeIncBasePriorityPrivilege	4472	wmic.exe
Token: SeCreatePagefilePrivilege	4472	wmic.exe
Token: SeBackupPrivilege	4472	wmic.exe
Token: SeRestorePrivilege	4472	wmic.exe
Token: SeShutdownPrivilege	4472	wmic.exe
Token: SeDebugPrivilege	4472	wmic.exe
Token: SeSystemEnvironmentPrivilege	4472	wmic.exe
Token: SeRemoteShutdownPrivilege	4472	wmic.exe
Token: SeUndockPrivilege	4472	wmic.exe
Token: SeManageVolumePrivilege	4472	wmic.exe
Token: 33	4472	wmic.exe
Token: 34	4472	wmic.exe
Token: 35	4472	wmic.exe
Token: 36	4472	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 4740 wrote to memory of 536	4740	cmd.exe	attrib.exe
PID 4740 wrote to memory of 536	4740	cmd.exe	attrib.exe
PID 4740 wrote to memory of 1712	4740	cmd.exe	attrib.exe
PID 4740 wrote to memory of 1712	4740	cmd.exe	attrib.exe
PID 4740 wrote to memory of 4472	4740	cmd.exe	wmic.exe
PID 4740 wrote to memory of 4472	4740	cmd.exe	wmic.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

536 attrib.exe
1712 attrib.exe

pid	process
536	attrib.exe
1712	attrib.exe

C:\Users\Admin\AppData\Local\Temp\cmd.exe
"C:\Users\Admin\AppData\Local\Temp\cmd.exe"
1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4740
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\cmd.exe
  2⤵
  - Views/modifies file attributes
  PID:536
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1712
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4472

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
240ff0a244a7a888a0df074b70473063

SHA1
85be735983e86eb656a920dde212fc5d467d642c

SHA256
f596fc4e9e9568c7fe0cac3b46d5e23932062cadc20f1c055f2ac2ab884bd00a

SHA512
83ea2029ea67799889cb3b088bb717fc41a1db85819ca42078de57aa0fb6cc66b578e6642a84d9ac0fb26cd3897ed1cd046e7818d0e79394ee6f149fbb1c2c4d

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads