skuld | a4a66b5826dbc95ed463bf1daaa417ae99ea8b1b27ddbacdceba94657babbafc

Analysis

max time kernel
32s
max time network
41s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
30-10-2024 07:50

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General

Target

skuld3.exe
Size

3.2MB
MD5

96cf5bfd737ba042e552c66fbd2d344e
SHA1

861e144cce53b756a81079923011ad87d6e3ce13
SHA256

a4a66b5826dbc95ed463bf1daaa417ae99ea8b1b27ddbacdceba94657babbafc
SHA512

6c3d9c276d3bc83d2043566da244af4d67f78f8cfb91fefb2c94204a02ab14f51a422407c912d80270959e1673af5edc2ce329821ff7b3daeb7e4e093199b2e9
SSDEEP

49152:yRlxzPzhxMQodCf1Cot+sZsjCsx1S+Of/3SoIT92oOXXbKUEucvUgiekSfmAre1W:yLpxMQt7kCszJ6/3Soe2XXkuZ/Ar

Score

10^/10

skuld persistence stealer upx

Malware Config

Extracted

Family

skuld

https://discordapp.com/api/webhooks/1293231846204903474/NlFoQQli1eEBiZ1mTgA4lGWcgDGUPQu-TH2KjA0djnkLkN-1Rj1Y4K7wda0xn3Aw-GJk

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-1-5-21-1361837696-2276465416-1936241636-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	skuld3.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/4444-0-0x0000000000040000-0x0000000000A88000-memory.dmp	upx
behavioral1/memory/4444-1-0x0000000000040000-0x0000000000A88000-memory.dmp	upx

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4444	skuld3.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4444 wrote to memory of 4400	4444	skuld3.exe	82
PID 4444 wrote to memory of 4400	4444	skuld3.exe	82

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4400	attrib.exe

C:\Users\Admin\AppData\Local\Temp\skuld3.exe
"C:\Users\Admin\AppData\Local\Temp\skuld3.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4444
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld3.exe
  2⤵
  - Views/modifies file attributes
  PID:4400

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

memory/4444-0-0x0000000000040000-0x0000000000A88000-memory.dmp

Filesize
10.3MB

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memory/4444-1-0x0000000000040000-0x0000000000A88000-memory.dmp

Filesize
10.3MB

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads