skuld | 89897dd0a4e265ae460b7c94d65188da8d49efb5cbd84613e513f99248379cb2

Analysis

max time kernel
34s
max time network
35s
platform
windows10-ltsc_2021_x64
resource
win10ltsc2021-20250314-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system
submitted
04/04/2025, 09:03

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General

Target

slinky/slinky.exe
Size

14.8MB
MD5

e6aca3b8b99f072c29a789cdc3f0720b
SHA1

3fdb976dbc7fb8b06446c59b6c9f984cfa98ae65
SHA256

41b8422aba7628289e08792bf8eefb5dd32e84b870f15b621c1ac728731321b6
SHA512

3d456509f57305b6ede700ccf446ed257bb73d21ab29be5d2aeb070bf43cfffc28daaac36648f379b3450398c737eb34ceb69ded93ba5e018fa9fccd661a0f0a
SSDEEP

196608:kqZ4f/oCqKqc/3h4Po9QXx+29GAB7ob73mrVGwYdNE2vfUW:3Z4XoBKHQ9AuM73gQDvfUW

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://ptb.discord.com/api/webhooks/1349978237123563552/9Z3tmeBDcx9gPVX1aoZkc47djylgCmPQ5oDmd4u78KdGgJx21nF4_I5dTUu_5OgY18YA

Signatures

Skuld family
skuld
Skuld stealer
An info stealer written in Go lang.
stealer skuld

Executes dropped EXE 1 IoCs

pid	Process
1844	SecurityHealthSystray.exe

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-1-5-21-780313508-644878201-565826771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	slinky.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.

flow	ioc
4	api.ipify.org
6	api.ipify.org
7	ip-api.com

GoLang User-Agent 1 IoCs

Uses default user-agent string defined by GoLang HTTP packages.

description	flow	ioc
HTTP User-Agent header	8	Go-http-client/1.1

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
5748	wmic.exe
5748	wmic.exe
5748	wmic.exe
5748	wmic.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	1408	slinky.exe
Token: SeDebugPrivilege	1844	SecurityHealthSystray.exe
Token: SeIncreaseQuotaPrivilege	5748	wmic.exe
Token: SeSecurityPrivilege	5748	wmic.exe
Token: SeTakeOwnershipPrivilege	5748	wmic.exe
Token: SeLoadDriverPrivilege	5748	wmic.exe
Token: SeSystemProfilePrivilege	5748	wmic.exe
Token: SeSystemtimePrivilege	5748	wmic.exe
Token: SeProfSingleProcessPrivilege	5748	wmic.exe
Token: SeIncBasePriorityPrivilege	5748	wmic.exe
Token: SeCreatePagefilePrivilege	5748	wmic.exe
Token: SeBackupPrivilege	5748	wmic.exe
Token: SeRestorePrivilege	5748	wmic.exe
Token: SeShutdownPrivilege	5748	wmic.exe
Token: SeDebugPrivilege	5748	wmic.exe
Token: SeSystemEnvironmentPrivilege	5748	wmic.exe
Token: SeRemoteShutdownPrivilege	5748	wmic.exe
Token: SeUndockPrivilege	5748	wmic.exe
Token: SeManageVolumePrivilege	5748	wmic.exe
Token: 33	5748	wmic.exe
Token: 34	5748	wmic.exe
Token: 35	5748	wmic.exe
Token: 36	5748	wmic.exe
Token: SeIncreaseQuotaPrivilege	5748	wmic.exe
Token: SeSecurityPrivilege	5748	wmic.exe
Token: SeTakeOwnershipPrivilege	5748	wmic.exe
Token: SeLoadDriverPrivilege	5748	wmic.exe
Token: SeSystemProfilePrivilege	5748	wmic.exe
Token: SeSystemtimePrivilege	5748	wmic.exe
Token: SeProfSingleProcessPrivilege	5748	wmic.exe
Token: SeIncBasePriorityPrivilege	5748	wmic.exe
Token: SeCreatePagefilePrivilege	5748	wmic.exe
Token: SeBackupPrivilege	5748	wmic.exe
Token: SeRestorePrivilege	5748	wmic.exe
Token: SeShutdownPrivilege	5748	wmic.exe
Token: SeDebugPrivilege	5748	wmic.exe
Token: SeSystemEnvironmentPrivilege	5748	wmic.exe
Token: SeRemoteShutdownPrivilege	5748	wmic.exe
Token: SeUndockPrivilege	5748	wmic.exe
Token: SeManageVolumePrivilege	5748	wmic.exe
Token: 33	5748	wmic.exe
Token: 34	5748	wmic.exe
Token: 35	5748	wmic.exe
Token: 36	5748	wmic.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1408 wrote to memory of 5148	1408	slinky.exe	83
PID 1408 wrote to memory of 5148	1408	slinky.exe	83
PID 1408 wrote to memory of 3404	1408	slinky.exe	86
PID 1408 wrote to memory of 3404	1408	slinky.exe	86
PID 5832 wrote to memory of 1844	5832	cmd.exe	87
PID 5832 wrote to memory of 1844	5832	cmd.exe	87
PID 1408 wrote to memory of 5748	1408	slinky.exe	88
PID 1408 wrote to memory of 5748	1408	slinky.exe	88

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5148	attrib.exe
3404	attrib.exe

C:\Users\Admin\AppData\Local\Temp\slinky\slinky.exe
"C:\Users\Admin\AppData\Local\Temp\slinky\slinky.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1408
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\slinky\slinky.exe
  2⤵
  - Views/modifies file attributes
  PID:5148
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:3404
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5748

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
1⤵
- Suspicious use of WriteProcessMemory
PID:5832
- C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1844

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2024

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe

Filesize
14.8MB

MD5
e6aca3b8b99f072c29a789cdc3f0720b

SHA1
3fdb976dbc7fb8b06446c59b6c9f984cfa98ae65

SHA256
41b8422aba7628289e08792bf8eefb5dd32e84b870f15b621c1ac728731321b6

SHA512
3d456509f57305b6ede700ccf446ed257bb73d21ab29be5d2aeb070bf43cfffc28daaac36648f379b3450398c737eb34ceb69ded93ba5e018fa9fccd661a0f0a

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