skuld | 463369ef73bf575c2031e4735f3575e59ff696d3d3c7fd32f2bea3d2902a850b

Analysis

max time kernel
1s
max time network
3s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
19-07-2024 12:03

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General

Target

WindowsAudioServicel.exe
Size

9.5MB
MD5

dc7b1ae6d4a8c83767e4f22bc6c05ebd
SHA1

b38b93dd7a8dbaef0e9aebcf71926fe6105f2ed8
SHA256

463369ef73bf575c2031e4735f3575e59ff696d3d3c7fd32f2bea3d2902a850b
SHA512

c137b55487a3797c3548b5112c1751337dc2ea049e9fd8f1c9bbaba76377be615182d540c74b8bbbb00fbab052a13c35dd722757f318568da05df514ba7c7752
SSDEEP

98304:OwkcpPjff2wzicqFkoJwcnXPzqEzo7F/3z26IZ:korffWkoJwMXPz3zq1IZ

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"	WindowsAudioServicel.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	4880	WindowsAudioServicel.exe
Token: SeIncreaseQuotaPrivilege	4996	wmic.exe
Token: SeSecurityPrivilege	4996	wmic.exe
Token: SeTakeOwnershipPrivilege	4996	wmic.exe
Token: SeLoadDriverPrivilege	4996	wmic.exe
Token: SeSystemProfilePrivilege	4996	wmic.exe
Token: SeSystemtimePrivilege	4996	wmic.exe
Token: SeProfSingleProcessPrivilege	4996	wmic.exe
Token: SeIncBasePriorityPrivilege	4996	wmic.exe
Token: SeCreatePagefilePrivilege	4996	wmic.exe
Token: SeBackupPrivilege	4996	wmic.exe
Token: SeRestorePrivilege	4996	wmic.exe
Token: SeShutdownPrivilege	4996	wmic.exe
Token: SeDebugPrivilege	4996	wmic.exe
Token: SeSystemEnvironmentPrivilege	4996	wmic.exe
Token: SeRemoteShutdownPrivilege	4996	wmic.exe
Token: SeUndockPrivilege	4996	wmic.exe
Token: SeManageVolumePrivilege	4996	wmic.exe
Token: 33	4996	wmic.exe
Token: 34	4996	wmic.exe
Token: 35	4996	wmic.exe
Token: 36	4996	wmic.exe
Token: SeIncreaseQuotaPrivilege	4996	wmic.exe
Token: SeSecurityPrivilege	4996	wmic.exe
Token: SeTakeOwnershipPrivilege	4996	wmic.exe
Token: SeLoadDriverPrivilege	4996	wmic.exe
Token: SeSystemProfilePrivilege	4996	wmic.exe
Token: SeSystemtimePrivilege	4996	wmic.exe
Token: SeProfSingleProcessPrivilege	4996	wmic.exe
Token: SeIncBasePriorityPrivilege	4996	wmic.exe
Token: SeCreatePagefilePrivilege	4996	wmic.exe
Token: SeBackupPrivilege	4996	wmic.exe
Token: SeRestorePrivilege	4996	wmic.exe
Token: SeShutdownPrivilege	4996	wmic.exe
Token: SeDebugPrivilege	4996	wmic.exe
Token: SeSystemEnvironmentPrivilege	4996	wmic.exe
Token: SeRemoteShutdownPrivilege	4996	wmic.exe
Token: SeUndockPrivilege	4996	wmic.exe
Token: SeManageVolumePrivilege	4996	wmic.exe
Token: 33	4996	wmic.exe
Token: 34	4996	wmic.exe
Token: 35	4996	wmic.exe
Token: 36	4996	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4880 wrote to memory of 3412	4880	WindowsAudioServicel.exe	74
PID 4880 wrote to memory of 3412	4880	WindowsAudioServicel.exe	74
PID 4880 wrote to memory of 1152	4880	WindowsAudioServicel.exe	75
PID 4880 wrote to memory of 1152	4880	WindowsAudioServicel.exe	75
PID 4880 wrote to memory of 4996	4880	WindowsAudioServicel.exe	76
PID 4880 wrote to memory of 4996	4880	WindowsAudioServicel.exe	76

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1152	attrib.exe
3412	attrib.exe

C:\Users\Admin\AppData\Local\Temp\WindowsAudioServicel.exe
"C:\Users\Admin\AppData\Local\Temp\WindowsAudioServicel.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4880
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\WindowsAudioServicel.exe
  2⤵
  - Views/modifies file attributes
  PID:3412
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1152
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4996

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
dc7b1ae6d4a8c83767e4f22bc6c05ebd

SHA1
b38b93dd7a8dbaef0e9aebcf71926fe6105f2ed8

SHA256
463369ef73bf575c2031e4735f3575e59ff696d3d3c7fd32f2bea3d2902a850b

SHA512
c137b55487a3797c3548b5112c1751337dc2ea049e9fd8f1c9bbaba76377be615182d540c74b8bbbb00fbab052a13c35dd722757f318568da05df514ba7c7752

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads