skuld | 4bf1ea8ace7f1c427b54adc6c8d9da2f79f5be1475e3ca4609e997e2b93f5e87

General

Target

slinky/slinky.exe
Size

14.2MB
MD5

5ef2d4590801769c57ea9b4690dc4a7d
SHA1

21a12ed600a2a69cb38091eb75b52c5bfee10c1d
SHA256

48e5cc1db19aacc0b68e6f4d8378fcd833f98cc7606e25a0fc185257332cf532
SHA512

358d4b1d78a7e6f8eabeb622ae6d8fe9d8dd6d2a0e839600ea637c2df42103639e34ac50bc8a7859f621ce858023f7fa527d2081f9c1dd24d200127a0977b99a
SSDEEP

196608:tWJafoL/tUoTX4ZZbh1Yf0k7Ma/rkFlgdTaUrPPbdfw:tWsfm/Mbh1lkSFCdTauZo

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

C2

https://ptb.discord.com/api/webhooks/1288586956971835474/KOwZpzzvHgBFnLYWk6PiicTPjzY_P0vpTibLIhpjtTMHi8CPkv2cwuhQTfaTc_MnkUX6

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

Processes:

slinky.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\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.

Processes:

flow ioc

5 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.

Processes:

description flow ioc

HTTP User-Agent header 8 Go-http-client/1.1

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

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

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

Processes:

slinky.exe

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 use of AdjustPrivilegeToken 43 IoCs

Processes:

slinky.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	3636	slinky.exe
Token: SeIncreaseQuotaPrivilege	3420	wmic.exe
Token: SeSecurityPrivilege	3420	wmic.exe
Token: SeTakeOwnershipPrivilege	3420	wmic.exe
Token: SeLoadDriverPrivilege	3420	wmic.exe
Token: SeSystemProfilePrivilege	3420	wmic.exe
Token: SeSystemtimePrivilege	3420	wmic.exe
Token: SeProfSingleProcessPrivilege	3420	wmic.exe
Token: SeIncBasePriorityPrivilege	3420	wmic.exe
Token: SeCreatePagefilePrivilege	3420	wmic.exe
Token: SeBackupPrivilege	3420	wmic.exe
Token: SeRestorePrivilege	3420	wmic.exe
Token: SeShutdownPrivilege	3420	wmic.exe
Token: SeDebugPrivilege	3420	wmic.exe
Token: SeSystemEnvironmentPrivilege	3420	wmic.exe
Token: SeRemoteShutdownPrivilege	3420	wmic.exe
Token: SeUndockPrivilege	3420	wmic.exe
Token: SeManageVolumePrivilege	3420	wmic.exe
Token: 33	3420	wmic.exe
Token: 34	3420	wmic.exe
Token: 35	3420	wmic.exe
Token: 36	3420	wmic.exe
Token: SeIncreaseQuotaPrivilege	3420	wmic.exe
Token: SeSecurityPrivilege	3420	wmic.exe
Token: SeTakeOwnershipPrivilege	3420	wmic.exe
Token: SeLoadDriverPrivilege	3420	wmic.exe
Token: SeSystemProfilePrivilege	3420	wmic.exe
Token: SeSystemtimePrivilege	3420	wmic.exe
Token: SeProfSingleProcessPrivilege	3420	wmic.exe
Token: SeIncBasePriorityPrivilege	3420	wmic.exe
Token: SeCreatePagefilePrivilege	3420	wmic.exe
Token: SeBackupPrivilege	3420	wmic.exe
Token: SeRestorePrivilege	3420	wmic.exe
Token: SeShutdownPrivilege	3420	wmic.exe
Token: SeDebugPrivilege	3420	wmic.exe
Token: SeSystemEnvironmentPrivilege	3420	wmic.exe
Token: SeRemoteShutdownPrivilege	3420	wmic.exe
Token: SeUndockPrivilege	3420	wmic.exe
Token: SeManageVolumePrivilege	3420	wmic.exe
Token: 33	3420	wmic.exe
Token: 34	3420	wmic.exe
Token: 35	3420	wmic.exe
Token: 36	3420	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

slinky.exe

description	pid	process	target process
PID 3636 wrote to memory of 3188	3636	slinky.exe	attrib.exe
PID 3636 wrote to memory of 3188	3636	slinky.exe	attrib.exe
PID 3636 wrote to memory of 2756	3636	slinky.exe	attrib.exe
PID 3636 wrote to memory of 2756	3636	slinky.exe	attrib.exe
PID 3636 wrote to memory of 3420	3636	slinky.exe	wmic.exe
PID 3636 wrote to memory of 3420	3636	slinky.exe	wmic.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

3188 attrib.exe
2756 attrib.exe

pid	process
3188	attrib.exe
2756	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:3636
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\slinky\slinky.exe
  2⤵
  - Views/modifies file attributes
  PID:3188
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:2756
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3420

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Hide Artifacts

1

T1564

Hidden Files and Directories

Modify Registry

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

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
5ef2d4590801769c57ea9b4690dc4a7d

SHA1
21a12ed600a2a69cb38091eb75b52c5bfee10c1d

SHA256
48e5cc1db19aacc0b68e6f4d8378fcd833f98cc7606e25a0fc185257332cf532

SHA512
358d4b1d78a7e6f8eabeb622ae6d8fe9d8dd6d2a0e839600ea637c2df42103639e34ac50bc8a7859f621ce858023f7fa527d2081f9c1dd24d200127a0977b99a

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads