skuld | a0d4650e1bddc92d6057794c28bfc483d43f19943867aaf72cc79c779a4c69af

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 18:58

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General

Target

SolaraB3.exe
Size

14.2MB
MD5

624a4bb9e224dc7ab6fd7b0d3cb6ab23
SHA1

90953409014197c02cfd5830cc19413e8f93bf4c
SHA256

a0d4650e1bddc92d6057794c28bfc483d43f19943867aaf72cc79c779a4c69af
SHA512

562c2879a22fcf3858f635903ac202250fbfc8142b05dc297ed20bfb20abdd04f65cac3e3cbd23b8298116ec437977d089f958c65c6f13439a9b96e322284b77
SSDEEP

196608:Fw60eLZLRRXSiFTzgzCIoT8c/aaA8e8IVqbYs84JD6yaYB:Ff0eVpgyT8c/uqYsRuyaM

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1259218063832649893/IiHQU4IgXAJ_sbb64QRWBjknEhtc0nJB9qW-ga_1A3-hTAWftJCcxWecoU_frvNQ19i9

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"	SolaraB3.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	4908	SolaraB3.exe
Token: SeIncreaseQuotaPrivilege	2936	wmic.exe
Token: SeSecurityPrivilege	2936	wmic.exe
Token: SeTakeOwnershipPrivilege	2936	wmic.exe
Token: SeLoadDriverPrivilege	2936	wmic.exe
Token: SeSystemProfilePrivilege	2936	wmic.exe
Token: SeSystemtimePrivilege	2936	wmic.exe
Token: SeProfSingleProcessPrivilege	2936	wmic.exe
Token: SeIncBasePriorityPrivilege	2936	wmic.exe
Token: SeCreatePagefilePrivilege	2936	wmic.exe
Token: SeBackupPrivilege	2936	wmic.exe
Token: SeRestorePrivilege	2936	wmic.exe
Token: SeShutdownPrivilege	2936	wmic.exe
Token: SeDebugPrivilege	2936	wmic.exe
Token: SeSystemEnvironmentPrivilege	2936	wmic.exe
Token: SeRemoteShutdownPrivilege	2936	wmic.exe
Token: SeUndockPrivilege	2936	wmic.exe
Token: SeManageVolumePrivilege	2936	wmic.exe
Token: 33	2936	wmic.exe
Token: 34	2936	wmic.exe
Token: 35	2936	wmic.exe
Token: 36	2936	wmic.exe
Token: SeIncreaseQuotaPrivilege	2936	wmic.exe
Token: SeSecurityPrivilege	2936	wmic.exe
Token: SeTakeOwnershipPrivilege	2936	wmic.exe
Token: SeLoadDriverPrivilege	2936	wmic.exe
Token: SeSystemProfilePrivilege	2936	wmic.exe
Token: SeSystemtimePrivilege	2936	wmic.exe
Token: SeProfSingleProcessPrivilege	2936	wmic.exe
Token: SeIncBasePriorityPrivilege	2936	wmic.exe
Token: SeCreatePagefilePrivilege	2936	wmic.exe
Token: SeBackupPrivilege	2936	wmic.exe
Token: SeRestorePrivilege	2936	wmic.exe
Token: SeShutdownPrivilege	2936	wmic.exe
Token: SeDebugPrivilege	2936	wmic.exe
Token: SeSystemEnvironmentPrivilege	2936	wmic.exe
Token: SeRemoteShutdownPrivilege	2936	wmic.exe
Token: SeUndockPrivilege	2936	wmic.exe
Token: SeManageVolumePrivilege	2936	wmic.exe
Token: 33	2936	wmic.exe
Token: 34	2936	wmic.exe
Token: 35	2936	wmic.exe
Token: 36	2936	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 3184	4908	SolaraB3.exe	74
PID 4908 wrote to memory of 3184	4908	SolaraB3.exe	74
PID 4908 wrote to memory of 1312	4908	SolaraB3.exe	75
PID 4908 wrote to memory of 1312	4908	SolaraB3.exe	75
PID 4908 wrote to memory of 2936	4908	SolaraB3.exe	76
PID 4908 wrote to memory of 2936	4908	SolaraB3.exe	76

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3184	attrib.exe
1312	attrib.exe

C:\Users\Admin\AppData\Local\Temp\SolaraB3.exe
"C:\Users\Admin\AppData\Local\Temp\SolaraB3.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4908
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\SolaraB3.exe
  2⤵
  - Views/modifies file attributes
  PID:3184
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1312
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2936

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
14.2MB

MD5
624a4bb9e224dc7ab6fd7b0d3cb6ab23

SHA1
90953409014197c02cfd5830cc19413e8f93bf4c

SHA256
a0d4650e1bddc92d6057794c28bfc483d43f19943867aaf72cc79c779a4c69af

SHA512
562c2879a22fcf3858f635903ac202250fbfc8142b05dc297ed20bfb20abdd04f65cac3e3cbd23b8298116ec437977d089f958c65c6f13439a9b96e322284b77

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads