skuld | 774c71f4e65a17cc744e906660435598f9b62dfdd599e9babbed3dd9dea32e53

Analysis

max time kernel
133s
max time network
135s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
12-10-2024 11:54

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General

Target

skuld.exe
Size

14.2MB
MD5

3eb420ceca33cebdf59e96abd6ba75a3
SHA1

fbd442d69323445e9ecedbe820c61fbac7fdb287
SHA256

774c71f4e65a17cc744e906660435598f9b62dfdd599e9babbed3dd9dea32e53
SHA512

06047f5492f785bb672c6059ef2b0f31855a63d4e91a41c9e8178d4958c5e50825433a4f8cd87e1aaf4be56492d9f86eccdbe9cf9ed3929621005636f591ee69
SSDEEP

196608:5ADrfDmwoUoG3n5OJG1Nf0k7Ma/rkFlgdTaUrPPbdf5:5A3faw+JG1KkSFCdTauZR

Score

10^/10

skuld persistence stealer

Malware Config

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-1-5-21-160447019-1232603106-4168707212-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	skuld.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	1616	skuld.exe
Token: SeIncreaseQuotaPrivilege	428	wmic.exe
Token: SeSecurityPrivilege	428	wmic.exe
Token: SeTakeOwnershipPrivilege	428	wmic.exe
Token: SeLoadDriverPrivilege	428	wmic.exe
Token: SeSystemProfilePrivilege	428	wmic.exe
Token: SeSystemtimePrivilege	428	wmic.exe
Token: SeProfSingleProcessPrivilege	428	wmic.exe
Token: SeIncBasePriorityPrivilege	428	wmic.exe
Token: SeCreatePagefilePrivilege	428	wmic.exe
Token: SeBackupPrivilege	428	wmic.exe
Token: SeRestorePrivilege	428	wmic.exe
Token: SeShutdownPrivilege	428	wmic.exe
Token: SeDebugPrivilege	428	wmic.exe
Token: SeSystemEnvironmentPrivilege	428	wmic.exe
Token: SeRemoteShutdownPrivilege	428	wmic.exe
Token: SeUndockPrivilege	428	wmic.exe
Token: SeManageVolumePrivilege	428	wmic.exe
Token: 33	428	wmic.exe
Token: 34	428	wmic.exe
Token: 35	428	wmic.exe
Token: 36	428	wmic.exe
Token: SeIncreaseQuotaPrivilege	428	wmic.exe
Token: SeSecurityPrivilege	428	wmic.exe
Token: SeTakeOwnershipPrivilege	428	wmic.exe
Token: SeLoadDriverPrivilege	428	wmic.exe
Token: SeSystemProfilePrivilege	428	wmic.exe
Token: SeSystemtimePrivilege	428	wmic.exe
Token: SeProfSingleProcessPrivilege	428	wmic.exe
Token: SeIncBasePriorityPrivilege	428	wmic.exe
Token: SeCreatePagefilePrivilege	428	wmic.exe
Token: SeBackupPrivilege	428	wmic.exe
Token: SeRestorePrivilege	428	wmic.exe
Token: SeShutdownPrivilege	428	wmic.exe
Token: SeDebugPrivilege	428	wmic.exe
Token: SeSystemEnvironmentPrivilege	428	wmic.exe
Token: SeRemoteShutdownPrivilege	428	wmic.exe
Token: SeUndockPrivilege	428	wmic.exe
Token: SeManageVolumePrivilege	428	wmic.exe
Token: 33	428	wmic.exe
Token: 34	428	wmic.exe
Token: 35	428	wmic.exe
Token: 36	428	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1616 wrote to memory of 4228	1616	skuld.exe	74
PID 1616 wrote to memory of 4228	1616	skuld.exe	74
PID 1616 wrote to memory of 1040	1616	skuld.exe	75
PID 1616 wrote to memory of 1040	1616	skuld.exe	75
PID 1616 wrote to memory of 428	1616	skuld.exe	76
PID 1616 wrote to memory of 428	1616	skuld.exe	76

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4228	attrib.exe
1040	attrib.exe

C:\Users\Admin\AppData\Local\Temp\skuld.exe
"C:\Users\Admin\AppData\Local\Temp\skuld.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1616
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
  2⤵
  - Views/modifies file attributes
  PID:4228
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1040
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:428

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
14.2MB

MD5
3eb420ceca33cebdf59e96abd6ba75a3

SHA1
fbd442d69323445e9ecedbe820c61fbac7fdb287

SHA256
774c71f4e65a17cc744e906660435598f9b62dfdd599e9babbed3dd9dea32e53

SHA512
06047f5492f785bb672c6059ef2b0f31855a63d4e91a41c9e8178d4958c5e50825433a4f8cd87e1aaf4be56492d9f86eccdbe9cf9ed3929621005636f591ee69

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads