skuld | 7cb04b7c094f2f1beb40a7b27136a9ff9c954b3edda52f5de99b31635e50b6db

Analysis

max time kernel
13s
max time network
22s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
06-07-2024 21:04

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General

Target

main.exe
Size

9.5MB
MD5

15767d56c12becc21502a59355a9c163
SHA1

360524f903a06307f32a9fd8ca839da949c75916
SHA256

7cb04b7c094f2f1beb40a7b27136a9ff9c954b3edda52f5de99b31635e50b6db
SHA512

e7faa7034920ed376869548fe2107035d7c24c578961fa2a1317f5f2231b2333668fd475a3b2deaf99fc4e87894f59837d40950f67cdadb4b1b016d0761dc13a
SSDEEP

98304:NzZIWZX0gybHFmOKMW2S6by4ELW/6FQKVVSf:n3501sMW2SiyxqEVVSf

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1258496423444615342/CgJY-4xdm5Ye24oauoByyHTOC86vzjGJvv8cMxKQz03UpkK8RVz4-rL3_dhMIWWysqJ_

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-1-5-21-1672260578-815027929-964132517-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	main.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
4	api.ipify.org

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1468	main.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1468 wrote to memory of 1648	1468	main.exe	79
PID 1468 wrote to memory of 1648	1468	main.exe	79
PID 1468 wrote to memory of 2820	1468	main.exe	80
PID 1468 wrote to memory of 2820	1468	main.exe	80

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1648	attrib.exe
2820	attrib.exe

C:\Users\Admin\AppData\Local\Temp\main.exe
"C:\Users\Admin\AppData\Local\Temp\main.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1468
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\main.exe
  2⤵
  - Views/modifies file attributes
  PID:1648
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:2820

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
15767d56c12becc21502a59355a9c163

SHA1
360524f903a06307f32a9fd8ca839da949c75916

SHA256
7cb04b7c094f2f1beb40a7b27136a9ff9c954b3edda52f5de99b31635e50b6db

SHA512
e7faa7034920ed376869548fe2107035d7c24c578961fa2a1317f5f2231b2333668fd475a3b2deaf99fc4e87894f59837d40950f67cdadb4b1b016d0761dc13a

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads