skuld | 4b2fcf4c248449374081407da3c58aaa0ae64ef85fe3fea1c2a2d4af8b12d200

Analysis

max time kernel
106s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
07/04/2025, 18:56

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General

Target

massdm.exe
Size

3.2MB
MD5

25a24614a8b8470d6a08d34c3d112e70
SHA1

fa8bab3543cc0b230b22e03476c66ed757745fe7
SHA256

4b2fcf4c248449374081407da3c58aaa0ae64ef85fe3fea1c2a2d4af8b12d200
SHA512

3162a70730d12d7825a3482203505942d89d34bfa757d6cc14a332edb8de8685373101897fe249f381c8362344877b039acb50a63b2aa4f3aab467f3ef950170
SSDEEP

49152:1p+HMpTnRKy6F/G3g7LG+6PEQXgYv/bzmiTXLVXqnqmZ5qIe6aviJrOoa+/1yeXJ:b+Hg8t4QsM6gYv/j7Iqmbaia+/1yeX

Score

10^/10

skuld persistence stealer upx

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1357043739994099863/o63i2p8pjLj5CbxWN7dl1wegLzLXdC-yGgKJErxIHMKVPwRaq1e7GPr2dIUqpFgYV5Bi

Signatures

Skuld family
skuld
Skuld stealer
An info stealer written in Go lang.
stealer skuld

Executes dropped EXE 1 IoCs

pid	Process
5700	SecurityHealthSystray.exe

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-1-5-21-308834014-1004923324-1191300197-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	massdm.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral1/memory/1208-0-0x00000000009E0000-0x000000000149C000-memory.dmp	upx
behavioral1/memory/1208-1-0x00000000009E0000-0x000000000149C000-memory.dmp	upx
behavioral1/files/0x00070000000242e1-3.dat	upx
behavioral1/memory/5700-5-0x0000000000940000-0x00000000013FC000-memory.dmp	upx
behavioral1/memory/5700-7-0x0000000000940000-0x00000000013FC000-memory.dmp	upx

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1208	massdm.exe
Token: SeDebugPrivilege	5700	SecurityHealthSystray.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1208 wrote to memory of 5568	1208	massdm.exe	87
PID 1208 wrote to memory of 5568	1208	massdm.exe	87
PID 5544 wrote to memory of 5700	5544	cmd.exe	91
PID 5544 wrote to memory of 5700	5544	cmd.exe	91
PID 5700 wrote to memory of 1944	5700	SecurityHealthSystray.exe	94
PID 5700 wrote to memory of 1944	5700	SecurityHealthSystray.exe	94

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
5568	attrib.exe
1944	attrib.exe

C:\Users\Admin\AppData\Local\Temp\massdm.exe
"C:\Users\Admin\AppData\Local\Temp\massdm.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1208
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\massdm.exe
  2⤵
  - Views/modifies file attributes
  PID:5568

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
1⤵
- Suspicious use of WriteProcessMemory
PID:5544
- C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5700
- - C:\Windows\system32\attrib.exe
    attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
    3⤵
    - Views/modifies file attributes
    PID:1944

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

C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe

Filesize
3.2MB

MD5
25a24614a8b8470d6a08d34c3d112e70

SHA1
fa8bab3543cc0b230b22e03476c66ed757745fe7

SHA256
4b2fcf4c248449374081407da3c58aaa0ae64ef85fe3fea1c2a2d4af8b12d200

SHA512
3162a70730d12d7825a3482203505942d89d34bfa757d6cc14a332edb8de8685373101897fe249f381c8362344877b039acb50a63b2aa4f3aab467f3ef950170

Download Submit
memory/1208-0-0x00000000009E0000-0x000000000149C000-memory.dmp

Filesize
10.7MB

Download
memory/1208-1-0x00000000009E0000-0x000000000149C000-memory.dmp

Filesize
10.7MB

Download
memory/5700-5-0x0000000000940000-0x00000000013FC000-memory.dmp

Filesize
10.7MB

Download
memory/5700-7-0x0000000000940000-0x00000000013FC000-memory.dmp

Filesize
10.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads