skuld | e2386170a278f82835c7c888d330fca7f058588cee728db554af82766f373520

Analysis

max time kernel
140s
max time network
124s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
20-10-2024 23:18

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General

Target

skuld.exe
Size

3.2MB
MD5

51ff57438f949975b4968961bc2642c4
SHA1

cba4898a4d42746c39fe11ebcd4045d4630932b2
SHA256

e2386170a278f82835c7c888d330fca7f058588cee728db554af82766f373520
SHA512

cb1b62473c08d25b49a9c5618ef0399db7bccff983cb11dfd9ec624a203ec1ef3958eef9822672c94676a7cdd484334dca03387450915dddc593bf4541efe859
SSDEEP

98304:9TlvH/VJ51LkW/0A3u+tjoOPztarROVJeE:bVKOu+pkROVJ

Score

10^/10

skuld persistence stealer upx

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1297685898183315507/dhotfNp8hFrKwfpwrk-upDYLgWkBSeuTImqAAVTnlndZgb3UvqPW2LZA6LIM7wOIg4Sp

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

Processes:

skuld.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	skuld.exe

UPX packed file 2 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/3400-0-0x0000000000FE0000-0x0000000001A28000-memory.dmp	upx
behavioral2/memory/3400-2-0x0000000000FE0000-0x0000000001A28000-memory.dmp	upx

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

skuld.exe

description pid process

Token: SeDebugPrivilege 3400 skuld.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

skuld.exe

description pid process target process

PID 3400 wrote to memory of 2996 3400 skuld.exe attrib.exe
PID 3400 wrote to memory of 2996 3400 skuld.exe attrib.exe
Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

2996 attrib.exe

description	pid	process
Token: SeDebugPrivilege	3400	skuld.exe

description	pid	process	target process
PID 3400 wrote to memory of 2996	3400	skuld.exe	attrib.exe
PID 3400 wrote to memory of 2996	3400	skuld.exe	attrib.exe

pid	process
2996	attrib.exe

C:\Users\Admin\AppData\Local\Temp\skuld.exe
"C:\Users\Admin\AppData\Local\Temp\skuld.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3400
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
  2⤵
  - Views/modifies file attributes
  PID:2996

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/3400-0-0x0000000000FE0000-0x0000000001A28000-memory.dmp

Filesize
10.3MB

Download
memory/3400-2-0x0000000000FE0000-0x0000000001A28000-memory.dmp

Filesize
10.3MB

Download