skuld | 8f9b5cb5362dcbc71f288d310a67b65957a18e83c660078f6d32056a6077c7ed

Analysis

max time kernel
93s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
11-10-2024 09:20

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General

Target

sigma.exe
Size

23.8MB
MD5

7b3b8c7ad73e483139127a259eedb39b
SHA1

8c8951d762a0cd2cdb6cc7ba3112d069fe95a4ec
SHA256

8f9b5cb5362dcbc71f288d310a67b65957a18e83c660078f6d32056a6077c7ed
SHA512

a4d1f60e6bced99b36f5057748ea1515eeccc7d4b1e64930063748c280c8f392962b079ab321e53cf8a366f1dd48ec79f28149a312e6d577f3cc3119d24c4056
SSDEEP

393216:V52BpDr3fdoc+5my5krGTONk+SBw7MSM5lMVFoga:b2Bp/7+0yBuk/BwJMzmFoga

Score

10^/10

skuld discovery persistence stealer

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1294219914600513648/1hMj8NibsG6kkmCebWQXD2dsOS3COgpf78DC2CqwIi8Ve2EgBTg8fRzgTY1uxq8ArsSQ

Signatures

Skuld stealer
An info stealer written in Go lang.
stealer skuld
Executes dropped EXE 1 IoCs

Processes:

sg.exe

pid process

1132 sg.exe

pid	process
1132	sg.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

sg.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	sg.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
discovery

System Language Discovery
T1614.001

Processes:

sigma.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language sigma.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

sg.exe

description pid process

Token: SeDebugPrivilege 1132 sg.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sigma.exe

description	pid	process
Token: SeDebugPrivilege	1132	sg.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

sigma.exesg.exe

description	pid	process	target process
PID 2416 wrote to memory of 1132	2416	sigma.exe	sg.exe
PID 2416 wrote to memory of 1132	2416	sigma.exe	sg.exe
PID 1132 wrote to memory of 1816	1132	sg.exe	attrib.exe
PID 1132 wrote to memory of 1816	1132	sg.exe	attrib.exe

Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

1816 attrib.exe

pid	process
1816	attrib.exe

C:\Users\Admin\AppData\Local\Temp\sigma.exe
"C:\Users\Admin\AppData\Local\Temp\sigma.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2416
- C:\Users\Admin\AppData\Local\Temp\sigma_9303f122-6bf5-4cc3-89f4-6e6f6d8619e5\sg.exe
  "C:\Users\Admin\AppData\Local\Temp\sigma_9303f122-6bf5-4cc3-89f4-6e6f6d8619e5\sg.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1132
- - C:\Windows\system32\attrib.exe
    attrib +h +s C:\Users\Admin\AppData\Local\Temp\sigma_9303f122-6bf5-4cc3-89f4-6e6f6d8619e5\sg.exe
    3⤵
    - Views/modifies file attributes
    PID:1816

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\sigma_9303f122-6bf5-4cc3-89f4-6e6f6d8619e5\sg.exe

Filesize
14.8MB

MD5
2a90ba072e3b471bcde749b7cd016fa3

SHA1
022469956011ddd8c84ab82f23bb4af9f3c2a5d9

SHA256
e6e38df3a9b32c592012748cd2a01f29faeb0aee3028571cb2abfa8d4f997102

SHA512
5886639582079c80871883aac6aa562215cb7b77de4a7dcc64916b83d39b96c03c4d0bee8e56efd87b39106226749561fc03292fd98e3d875eaa5e5b7b248530

Download Submit
memory/2416-0-0x0000000074ECE000-0x0000000074ECF000-memory.dmp

Filesize
4KB

Download
memory/2416-1-0x0000000000580000-0x00000000005CA000-memory.dmp

Filesize
296KB

Download
memory/2416-2-0x0000000002930000-0x0000000002954000-memory.dmp

Filesize
144KB

Download
memory/2416-3-0x0000000074EC0000-0x0000000075670000-memory.dmp

Filesize
7.7MB

Download
memory/2416-4-0x00000000056F0000-0x0000000005C94000-memory.dmp

Filesize
5.6MB

Download
memory/2416-130-0x0000000074EC0000-0x0000000075670000-memory.dmp

Filesize
7.7MB

Download