skuld | 5195c14f3b204c7fb8d9c3ec7df175fac89f3ff83485de64106e55d9b93f7989

Analysis

max time kernel
148s
max time network
150s
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 09:16

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General

Target

skuld.exe
Size

7.5MB
MD5

86cfaeefec2c4ce9bba60640d2d4dee7
SHA1

426c0ee6bc8ab22041afc53b25b7ef312a185a66
SHA256

5195c14f3b204c7fb8d9c3ec7df175fac89f3ff83485de64106e55d9b93f7989
SHA512

12b36bbbe28cbb2664d6bbea9a7569960a1b480af38867dfc099d7c823bf84cbca4443260acdaef4ac45f8a9d35b4b9bf3348a600138029a8b0165d324348f5a
SSDEEP

196608:1lNk+HyZDcdb7MSv5of5VWu0+yE8ToCFD:jNk+SBw7MSM5lMVF

Score

10^/10

skuld persistence stealer upx

Malware Config

Extracted

Family

skuld

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

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-1-5-21-1045960512-3948844814-3059691613-1000\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/4608-0-0x00000000001F0000-0x0000000001129000-memory.dmp	upx
behavioral2/memory/4608-1-0x00000000001F0000-0x0000000001129000-memory.dmp	upx

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

skuld.exe

description pid process

Token: SeDebugPrivilege 4608 skuld.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

skuld.exe

description pid process target process

PID 4608 wrote to memory of 1088 4608 skuld.exe attrib.exe
PID 4608 wrote to memory of 1088 4608 skuld.exe attrib.exe
Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

1088 attrib.exe

description	pid	process
Token: SeDebugPrivilege	4608	skuld.exe

description	pid	process	target process
PID 4608 wrote to memory of 1088	4608	skuld.exe	attrib.exe
PID 4608 wrote to memory of 1088	4608	skuld.exe	attrib.exe

pid	process
1088	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:4608
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
  2⤵
  - Views/modifies file attributes
  PID:1088

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/4608-0-0x00000000001F0000-0x0000000001129000-memory.dmp

Filesize
15.2MB

Download
memory/4608-1-0x00000000001F0000-0x0000000001129000-memory.dmp

Filesize
15.2MB

Download