skuld | d0d3f6fd6e0e0b6c4bfbd4aa55d8a3151823d59005e0fb6428d6cd309460142a

Analysis

max time kernel
150s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
01-07-2024 18:15

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General

Target

main.exe
Size

9.5MB
MD5

69a284930fc8843088f37d2eb2173bfb
SHA1

97a032288ef740de5688e81f5fbafd319f45e4e8
SHA256

d0d3f6fd6e0e0b6c4bfbd4aa55d8a3151823d59005e0fb6428d6cd309460142a
SHA512

7445d360851df542710826185c37c4f7d6164c2ec853c667ce19d5fb4dfca1e981d96e3a2d48ba4f78580ce5e3ee2e7ff8b97f6b3a471d074c2dabd43e00f87e
SSDEEP

98304:kzZIWZX0gybHFmOKMW2S6bybELW/6FQKVVSf:g3501sMW2SiyIqEVVSf

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1257326008978247782/OPGroUs8KObiwYFAx-sn3YMX8edjwDL8Y64jbGKljvVRofhnkdb6B1Ov4DEY3TP5wW4W

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:

main.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	main.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.

Processes:

flow	ioc
17	api.ipify.org
21	api.ipify.org
2	api.ipify.org
15	api.ipify.org
16	api.ipify.org
19	api.ipify.org
8	api.ipify.org
18	api.ipify.org
20	api.ipify.org
5	api.ipify.org
11	api.ipify.org
13	api.ipify.org
14	api.ipify.org

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

main.exe

description pid process

Token: SeDebugPrivilege 4548 main.exe

description	pid	process
Token: SeDebugPrivilege	4548	main.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

main.exe

description	pid	process	target process
PID 4548 wrote to memory of 5112	4548	main.exe	attrib.exe
PID 4548 wrote to memory of 5112	4548	main.exe	attrib.exe
PID 4548 wrote to memory of 2540	4548	main.exe	attrib.exe
PID 4548 wrote to memory of 2540	4548	main.exe	attrib.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

5112 attrib.exe
2540 attrib.exe

pid	process
5112	attrib.exe
2540	attrib.exe

C:\Users\Admin\AppData\Local\Temp\main.exe
"C:\Users\Admin\AppData\Local\Temp\main.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4548
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Local\Temp\main.exe
  2⤵
  - Views/modifies file attributes
  PID:5112
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:2540

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

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

Filesize
9.5MB

MD5
69a284930fc8843088f37d2eb2173bfb

SHA1
97a032288ef740de5688e81f5fbafd319f45e4e8

SHA256
d0d3f6fd6e0e0b6c4bfbd4aa55d8a3151823d59005e0fb6428d6cd309460142a

SHA512
7445d360851df542710826185c37c4f7d6164c2ec853c667ce19d5fb4dfca1e981d96e3a2d48ba4f78580ce5e3ee2e7ff8b97f6b3a471d074c2dabd43e00f87e

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