skuld | a4a66b5826dbc95ed463bf1daaa417ae99ea8b1b27ddbacdceba94657babbafc

Analysis

max time kernel
135s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
30-10-2024 10:30

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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

Processes:

skuld3.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\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

Processes:

resource	yara_rule
behavioral2/memory/4436-0-0x0000000000140000-0x0000000000B88000-memory.dmp	upx
behavioral2/memory/4436-2-0x0000000000140000-0x0000000000B88000-memory.dmp	upx

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

skuld3.exe

description pid process

Token: SeDebugPrivilege 4436 skuld3.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

skuld3.exe

description pid process target process

PID 4436 wrote to memory of 4440 4436 skuld3.exe attrib.exe
PID 4436 wrote to memory of 4440 4436 skuld3.exe attrib.exe
Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

4440 attrib.exe

description	pid	process
Token: SeDebugPrivilege	4436	skuld3.exe

description	pid	process	target process
PID 4436 wrote to memory of 4440	4436	skuld3.exe	attrib.exe
PID 4436 wrote to memory of 4440	4436	skuld3.exe	attrib.exe

pid	process
4440	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:4436

C:\Windows\system32\attrib.exe
attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld3.exe
2⤵
- Views/modifies file attributes
PID:4440

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

Replay Monitor

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Downloads

memory/4436-0-0x0000000000140000-0x0000000000B88000-memory.dmp

Filesize
10.3MB

Download
memory/4436-2-0x0000000000140000-0x0000000000B88000-memory.dmp

Filesize
10.3MB

Download