skuld | b2389efe45f191978aeea0b38f35e967e812583644512e1d721b7adb88719008

Analysis

max time kernel
55s
max time network
61s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
30-06-2024 09:39

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General

Target

skuld.exe
Size

9.5MB
MD5

79ff221ab5f4ec73e3cf2603de02dd3c
SHA1

d03cd4bd46d07692b2cb2aa70032b2f7cf8f6614
SHA256

b2389efe45f191978aeea0b38f35e967e812583644512e1d721b7adb88719008
SHA512

04bdae4d323d1bc9446778e1ee66aaf1e3249e40de6dc8406eac9138e1b1b87ee00faf5a6cc41aeeb8b816c7b96a3d6bec442470f7c884318b91f2baa36f64a9
SSDEEP

98304:e03AgTj/aqro8jCvVwPIieO7XFEDT7kF8+l19Qfz:vlj/apjwPIiemX2DTW1if

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-1-5-21-1181767204-2009306918-3718769404-1000\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 6 IoCs

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

flow	ioc
11	api.ipify.org
15	api.ipify.org
3	api.ipify.org
4	api.ipify.org
8	api.ipify.org
10	api.ipify.org

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1096	skuld.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1096 wrote to memory of 1996	1096	skuld.exe	89
PID 1096 wrote to memory of 1996	1096	skuld.exe	89
PID 1096 wrote to memory of 1124	1096	skuld.exe	90
PID 1096 wrote to memory of 1124	1096	skuld.exe	90

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1996	attrib.exe
1124	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:1096
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
  2⤵
  - Views/modifies file attributes
  PID:1996
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:1124

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4184,i,9746875443948590908,1444894342962555245,262144 --variations-seed-version --mojo-platform-channel-handle=4232 /prefetch:8
1⤵
PID:4076

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
79ff221ab5f4ec73e3cf2603de02dd3c

SHA1
d03cd4bd46d07692b2cb2aa70032b2f7cf8f6614

SHA256
b2389efe45f191978aeea0b38f35e967e812583644512e1d721b7adb88719008

SHA512
04bdae4d323d1bc9446778e1ee66aaf1e3249e40de6dc8406eac9138e1b1b87ee00faf5a6cc41aeeb8b816c7b96a3d6bec442470f7c884318b91f2baa36f64a9

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads