skuld | 493230b3cb248901173b922478af1049819668b662732c987a4d290c8bf682cb

Analysis

max time kernel
149s
max time network
152s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250217-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250217-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
17-02-2025 20:06

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General

Target

slinky/slinky.exe
Size

14.8MB
MD5

a15f639ad6f334ddccacb2ecbd03fe19
SHA1

4f7cf4a736b994d00d916a8572dbac8dd02f0652
SHA256

46b69ba1e32ea096b56139e74e865e187647885edd9c5e9f5643969f81d7fd38
SHA512

2e5290b7a0722f09c60f537d8b60032c881c614eb1e3b85cc4c9043d29cebfb983880e00e8bb32e6d9c31e88eaed87732872730ba4d39c12c74d2a79a2cf9e8f
SSDEEP

196608:sqZ4f/oCqKqc/3h4Po9LXx+29GAB7ob73mrVGwYdNE2vfUW:/Z4XoBKHL9AuM73gQDvfUW

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://ptb.discord.com/api/webhooks/1341045599763562528/FEFU_oks7qRAW2B1VavjnBoTqNy2XgZADJlF2E33Vat_T2iMqWdIWyIFSMmlSv3zvS7l

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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-983685854-559653692-675906587-1000\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
1	api.ipify.org
2	api.ipify.org
4	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	5	Go-http-client/1.1

Modifies system certificate store 2 TTPs 3 IoCs

defense_evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

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

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
3916	wmic.exe
3916	wmic.exe
3916	wmic.exe
3916	wmic.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	2300	slinky.exe
Token: SeIncreaseQuotaPrivilege	3916	wmic.exe
Token: SeSecurityPrivilege	3916	wmic.exe
Token: SeTakeOwnershipPrivilege	3916	wmic.exe
Token: SeLoadDriverPrivilege	3916	wmic.exe
Token: SeSystemProfilePrivilege	3916	wmic.exe
Token: SeSystemtimePrivilege	3916	wmic.exe
Token: SeProfSingleProcessPrivilege	3916	wmic.exe
Token: SeIncBasePriorityPrivilege	3916	wmic.exe
Token: SeCreatePagefilePrivilege	3916	wmic.exe
Token: SeBackupPrivilege	3916	wmic.exe
Token: SeRestorePrivilege	3916	wmic.exe
Token: SeShutdownPrivilege	3916	wmic.exe
Token: SeDebugPrivilege	3916	wmic.exe
Token: SeSystemEnvironmentPrivilege	3916	wmic.exe
Token: SeRemoteShutdownPrivilege	3916	wmic.exe
Token: SeUndockPrivilege	3916	wmic.exe
Token: SeManageVolumePrivilege	3916	wmic.exe
Token: 33	3916	wmic.exe
Token: 34	3916	wmic.exe
Token: 35	3916	wmic.exe
Token: 36	3916	wmic.exe
Token: SeIncreaseQuotaPrivilege	3916	wmic.exe
Token: SeSecurityPrivilege	3916	wmic.exe
Token: SeTakeOwnershipPrivilege	3916	wmic.exe
Token: SeLoadDriverPrivilege	3916	wmic.exe
Token: SeSystemProfilePrivilege	3916	wmic.exe
Token: SeSystemtimePrivilege	3916	wmic.exe
Token: SeProfSingleProcessPrivilege	3916	wmic.exe
Token: SeIncBasePriorityPrivilege	3916	wmic.exe
Token: SeCreatePagefilePrivilege	3916	wmic.exe
Token: SeBackupPrivilege	3916	wmic.exe
Token: SeRestorePrivilege	3916	wmic.exe
Token: SeShutdownPrivilege	3916	wmic.exe
Token: SeDebugPrivilege	3916	wmic.exe
Token: SeSystemEnvironmentPrivilege	3916	wmic.exe
Token: SeRemoteShutdownPrivilege	3916	wmic.exe
Token: SeUndockPrivilege	3916	wmic.exe
Token: SeManageVolumePrivilege	3916	wmic.exe
Token: 33	3916	wmic.exe
Token: 34	3916	wmic.exe
Token: 35	3916	wmic.exe
Token: 36	3916	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2300 wrote to memory of 1836	2300	slinky.exe	81
PID 2300 wrote to memory of 1836	2300	slinky.exe	81
PID 2300 wrote to memory of 1852	2300	slinky.exe	82
PID 2300 wrote to memory of 1852	2300	slinky.exe	82
PID 2300 wrote to memory of 3916	2300	slinky.exe	83
PID 2300 wrote to memory of 3916	2300	slinky.exe	83

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
1836	attrib.exe
1852	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
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2300
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\slinky\slinky.exe
  2⤵
  - Views/modifies file attributes
  PID:1836
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1852
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3916

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

Subvert Trust Controls

T1553

Install Root Certificate

T1553.004

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
a15f639ad6f334ddccacb2ecbd03fe19

SHA1
4f7cf4a736b994d00d916a8572dbac8dd02f0652

SHA256
46b69ba1e32ea096b56139e74e865e187647885edd9c5e9f5643969f81d7fd38

SHA512
2e5290b7a0722f09c60f537d8b60032c881c614eb1e3b85cc4c9043d29cebfb983880e00e8bb32e6d9c31e88eaed87732872730ba4d39c12c74d2a79a2cf9e8f

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