skuld | 0930196a028fe8d4e1726f808b76d2b1c1c68fe69e8c9f49107da7b62bd48361

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 08:11

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General

Target

skuld.exe
Size

9.5MB
MD5

7dd191e903d61bdd90b8cad94c666369
SHA1

f6c46f0c288d36e93e8f6d390dd66a17b5e579c2
SHA256

0930196a028fe8d4e1726f808b76d2b1c1c68fe69e8c9f49107da7b62bd48361
SHA512

26a8157c8b36339849f86734348d977952f10cbad2e5e072f64915b8e788e4b503ae0aa488cbdf1362406696b9b5e775530da6316a9cd0fc6be1a7ed2fad2c3b
SSDEEP

98304:r8NrVo1/zObl7CbvV5FILXqpYlEb6kF88l19AfE:qW1/zo65FILXMYWbz1ef

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://ptb.discord.com/api/webhooks/1256850408366805072/x2jhBqkG5nRjLNf7Yy2ji8FT3b3A6xGu7AHz2QklzVo2SpmpCJ5IJJH53vIuMneMeSAl

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-1-5-21-1672260578-815027929-964132517-1000\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
10	api.ipify.org
15	api.ipify.org
18	api.ipify.org
19	api.ipify.org
4	api.ipify.org
17	api.ipify.org
14	api.ipify.org
16	api.ipify.org
7	api.ipify.org
12	api.ipify.org
13	api.ipify.org
20	api.ipify.org
1	api.ipify.org

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1672260578-815027929-964132517-1000_Classes\Local Settings\MuiCache	MiniSearchHost.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2428	skuld.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2372	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2428 wrote to memory of 1684	2428	skuld.exe	79
PID 2428 wrote to memory of 1684	2428	skuld.exe	79
PID 2428 wrote to memory of 1780	2428	skuld.exe	80
PID 2428 wrote to memory of 1780	2428	skuld.exe	80

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1684	attrib.exe
1780	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:2428
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
  2⤵
  - Views/modifies file attributes
  PID:1684
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1780

C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:2372

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\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
e9aa12ff0be6d995ed86f8cf88678158

SHA1
e5ee38fc2ebef0fcbc3059dee29b39f7daf21931

SHA256
f35cd8ef03ac924a59943c5dfffc31ab67a8b5aff272e9f47ff776aabc7ee561

SHA512
95a67acd2a4784b87d73910c1f1f590937c9d9b901e98448556a37eb8137ae5f458f1c673d65a46cf7d6b90bee5fe6b102ce3eeac9e819062cd9c5c2418bcbfc

Download Submit
C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
f6cf8a445e1a471d6dff34d1abb8efdb

SHA1
57e4448a4b9475bb529dd7bb3a9808e6e0400b76

SHA256
355f4081dc19d2bfd40aa473a1f76ff02912cf04906b9af9dd62edb0646e1c5a

SHA512
64e33a1eb07c42dbd55ad342b35b34487b9a659205e0f0a5f6605135f5b710deb4882af894fb1c807e0d48a5acffdf3911740ae6c0eacaa4c173f64351deb3d2

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

Filesize
9.5MB

MD5
7dd191e903d61bdd90b8cad94c666369

SHA1
f6c46f0c288d36e93e8f6d390dd66a17b5e579c2

SHA256
0930196a028fe8d4e1726f808b76d2b1c1c68fe69e8c9f49107da7b62bd48361

SHA512
26a8157c8b36339849f86734348d977952f10cbad2e5e072f64915b8e788e4b503ae0aa488cbdf1362406696b9b5e775530da6316a9cd0fc6be1a7ed2fad2c3b

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads