skuld | 7cb04b7c094f2f1beb40a7b27136a9ff9c954b3edda52f5de99b31635e50b6db

Analysis

max time kernel
15s
max time network
17s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-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-1-5-21-160447019-1232603106-4168707212-1000\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
2	api.ipify.org

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	1008	main.exe
Token: SeIncreaseQuotaPrivilege	3136	wmic.exe
Token: SeSecurityPrivilege	3136	wmic.exe
Token: SeTakeOwnershipPrivilege	3136	wmic.exe
Token: SeLoadDriverPrivilege	3136	wmic.exe
Token: SeSystemProfilePrivilege	3136	wmic.exe
Token: SeSystemtimePrivilege	3136	wmic.exe
Token: SeProfSingleProcessPrivilege	3136	wmic.exe
Token: SeIncBasePriorityPrivilege	3136	wmic.exe
Token: SeCreatePagefilePrivilege	3136	wmic.exe
Token: SeBackupPrivilege	3136	wmic.exe
Token: SeRestorePrivilege	3136	wmic.exe
Token: SeShutdownPrivilege	3136	wmic.exe
Token: SeDebugPrivilege	3136	wmic.exe
Token: SeSystemEnvironmentPrivilege	3136	wmic.exe
Token: SeRemoteShutdownPrivilege	3136	wmic.exe
Token: SeUndockPrivilege	3136	wmic.exe
Token: SeManageVolumePrivilege	3136	wmic.exe
Token: 33	3136	wmic.exe
Token: 34	3136	wmic.exe
Token: 35	3136	wmic.exe
Token: 36	3136	wmic.exe
Token: SeIncreaseQuotaPrivilege	3136	wmic.exe
Token: SeSecurityPrivilege	3136	wmic.exe
Token: SeTakeOwnershipPrivilege	3136	wmic.exe
Token: SeLoadDriverPrivilege	3136	wmic.exe
Token: SeSystemProfilePrivilege	3136	wmic.exe
Token: SeSystemtimePrivilege	3136	wmic.exe
Token: SeProfSingleProcessPrivilege	3136	wmic.exe
Token: SeIncBasePriorityPrivilege	3136	wmic.exe
Token: SeCreatePagefilePrivilege	3136	wmic.exe
Token: SeBackupPrivilege	3136	wmic.exe
Token: SeRestorePrivilege	3136	wmic.exe
Token: SeShutdownPrivilege	3136	wmic.exe
Token: SeDebugPrivilege	3136	wmic.exe
Token: SeSystemEnvironmentPrivilege	3136	wmic.exe
Token: SeRemoteShutdownPrivilege	3136	wmic.exe
Token: SeUndockPrivilege	3136	wmic.exe
Token: SeManageVolumePrivilege	3136	wmic.exe
Token: 33	3136	wmic.exe
Token: 34	3136	wmic.exe
Token: 35	3136	wmic.exe
Token: 36	3136	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1008 wrote to memory of 1636	1008	main.exe	74
PID 1008 wrote to memory of 1636	1008	main.exe	74
PID 1008 wrote to memory of 1972	1008	main.exe	75
PID 1008 wrote to memory of 1972	1008	main.exe	75
PID 1008 wrote to memory of 3136	1008	main.exe	76
PID 1008 wrote to memory of 3136	1008	main.exe	76

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1636	attrib.exe
1972	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:1008
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\main.exe
  2⤵
  - Views/modifies file attributes
  PID:1636
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1972
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3136

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