skuld | ef5ba17ab5fdb6a8cbc5dfcad5226b02e3f14c45e04e98080db150965842fd30

Analysis

max time kernel
195s
max time network
304s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
30-06-2024 18:33

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General

Target

skuld (1).exe
Size

9.5MB
MD5

c687ae7e3be528c38d7a00b93e04d332
SHA1

c7f60d1a0eee7a774309b9b60c457b0788cc6cab
SHA256

ef5ba17ab5fdb6a8cbc5dfcad5226b02e3f14c45e04e98080db150965842fd30
SHA512

b0d23b80741b7da1aa47f56d482bd9adca72b4113385bf00c090487470f20a9765eeb853d25c324662f15b4b080ef7f4e37536a08ea5bbfd0eb5766530c7739e
SSDEEP

98304:9nGwRbFvrLPk4GIipU10RSOMRBjLEHpyQWvmjFVf1:IwxFvrt10RS9RBjYHpdVf1

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1257036488672153761/NvDp_1b2nXLy-u8-yrTiFucpasoL2g34R7fCAV1w_Hji_Wd5urWsmS5DdJXMZb_5lbXp

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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3968772205-1713802336-1776639840-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	skuld (1).exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	api.ipify.org
2	api.ipify.org

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	5032	skuld (1).exe
Token: SeIncreaseQuotaPrivilege	2556	wmic.exe
Token: SeSecurityPrivilege	2556	wmic.exe
Token: SeTakeOwnershipPrivilege	2556	wmic.exe
Token: SeLoadDriverPrivilege	2556	wmic.exe
Token: SeSystemProfilePrivilege	2556	wmic.exe
Token: SeSystemtimePrivilege	2556	wmic.exe
Token: SeProfSingleProcessPrivilege	2556	wmic.exe
Token: SeIncBasePriorityPrivilege	2556	wmic.exe
Token: SeCreatePagefilePrivilege	2556	wmic.exe
Token: SeBackupPrivilege	2556	wmic.exe
Token: SeRestorePrivilege	2556	wmic.exe
Token: SeShutdownPrivilege	2556	wmic.exe
Token: SeDebugPrivilege	2556	wmic.exe
Token: SeSystemEnvironmentPrivilege	2556	wmic.exe
Token: SeRemoteShutdownPrivilege	2556	wmic.exe
Token: SeUndockPrivilege	2556	wmic.exe
Token: SeManageVolumePrivilege	2556	wmic.exe
Token: 33	2556	wmic.exe
Token: 34	2556	wmic.exe
Token: 35	2556	wmic.exe
Token: 36	2556	wmic.exe
Token: SeIncreaseQuotaPrivilege	2556	wmic.exe
Token: SeSecurityPrivilege	2556	wmic.exe
Token: SeTakeOwnershipPrivilege	2556	wmic.exe
Token: SeLoadDriverPrivilege	2556	wmic.exe
Token: SeSystemProfilePrivilege	2556	wmic.exe
Token: SeSystemtimePrivilege	2556	wmic.exe
Token: SeProfSingleProcessPrivilege	2556	wmic.exe
Token: SeIncBasePriorityPrivilege	2556	wmic.exe
Token: SeCreatePagefilePrivilege	2556	wmic.exe
Token: SeBackupPrivilege	2556	wmic.exe
Token: SeRestorePrivilege	2556	wmic.exe
Token: SeShutdownPrivilege	2556	wmic.exe
Token: SeDebugPrivilege	2556	wmic.exe
Token: SeSystemEnvironmentPrivilege	2556	wmic.exe
Token: SeRemoteShutdownPrivilege	2556	wmic.exe
Token: SeUndockPrivilege	2556	wmic.exe
Token: SeManageVolumePrivilege	2556	wmic.exe
Token: 33	2556	wmic.exe
Token: 34	2556	wmic.exe
Token: 35	2556	wmic.exe
Token: 36	2556	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5032 wrote to memory of 3092	5032	skuld (1).exe	73
PID 5032 wrote to memory of 3092	5032	skuld (1).exe	73
PID 5032 wrote to memory of 1780	5032	skuld (1).exe	74
PID 5032 wrote to memory of 1780	5032	skuld (1).exe	74
PID 5032 wrote to memory of 2556	5032	skuld (1).exe	75
PID 5032 wrote to memory of 2556	5032	skuld (1).exe	75

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3092	attrib.exe
1780	attrib.exe

C:\Users\Admin\AppData\Local\Temp\skuld (1).exe
"C:\Users\Admin\AppData\Local\Temp\skuld (1).exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5032
- C:\Windows\system32\attrib.exe
  attrib +h +s "C:\Users\Admin\AppData\Local\Temp\skuld (1).exe"
  2⤵
  - Views/modifies file attributes
  PID:3092
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1780
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2556

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

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
9.5MB

MD5
c687ae7e3be528c38d7a00b93e04d332

SHA1
c7f60d1a0eee7a774309b9b60c457b0788cc6cab

SHA256
ef5ba17ab5fdb6a8cbc5dfcad5226b02e3f14c45e04e98080db150965842fd30

SHA512
b0d23b80741b7da1aa47f56d482bd9adca72b4113385bf00c090487470f20a9765eeb853d25c324662f15b4b080ef7f4e37536a08ea5bbfd0eb5766530c7739e

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads