skuld | c58b34b4af808fefeaf1545f4f3c0375a32cdb9a6e6c95c4d0cf50ea601aad3e

Analysis

max time kernel
149s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
30-06-2024 06:04

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General

Target

skuld.exe
Size

9.5MB
MD5

da4bf124529b32d5daff341cba7b746c
SHA1

7297b55ceff76cdec32e722902ae61524d4b7442
SHA256

c58b34b4af808fefeaf1545f4f3c0375a32cdb9a6e6c95c4d0cf50ea601aad3e
SHA512

7a04a1f68045c7b91f5df3e12c155543f4934678d764bbd5c8db78e33dc13ae4885bcdcc7f2af4ab8f2417633090286a0263143f5992470e4416eaee3a2d194a
SSDEEP

98304:0l+jC6y/CQ8VtNqvV0FIS3fT4mEJJkF88l19bf3:ZDy/ChS0FIS3r4DJC19f

Score

10^/10

skuld persistence stealer

Malware Config

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

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2457560273-69882387-977367775-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	skuld.exe

Looks up external IP address via web service 13 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
17	api.ipify.org
18	api.ipify.org
19	api.ipify.org
1	api.ipify.org
10	api.ipify.org
20	api.ipify.org
15	api.ipify.org
16	api.ipify.org
13	api.ipify.org
4	api.ipify.org
12	api.ipify.org
7	api.ipify.org
14	api.ipify.org

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2684	skuld.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2684 wrote to memory of 5108	2684	skuld.exe	78
PID 2684 wrote to memory of 5108	2684	skuld.exe	78
PID 2684 wrote to memory of 4428	2684	skuld.exe	79
PID 2684 wrote to memory of 4428	2684	skuld.exe	79

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
5108	attrib.exe
4428	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:2684
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
  2⤵
  - Views/modifies file attributes
  PID:5108
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:4428

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
9.5MB

MD5
da4bf124529b32d5daff341cba7b746c

SHA1
7297b55ceff76cdec32e722902ae61524d4b7442

SHA256
c58b34b4af808fefeaf1545f4f3c0375a32cdb9a6e6c95c4d0cf50ea601aad3e

SHA512
7a04a1f68045c7b91f5df3e12c155543f4934678d764bbd5c8db78e33dc13ae4885bcdcc7f2af4ab8f2417633090286a0263143f5992470e4416eaee3a2d194a

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads