skuld | 7514379d03a14596ecf9e1a378d844d90314561d660e0c3947131e279fa27f73

General

Target

main.exe
Size

14.2MB
MD5

32555cfe5d6baeaf6a7fe7bb7fb65b2c
SHA1

d96b09517a45fdbcb852751dadbf6f8ba880c809
SHA256

7514379d03a14596ecf9e1a378d844d90314561d660e0c3947131e279fa27f73
SHA512

53ff705e8180255fed91da6d1e671b4cdd5d9bb837679748d54acb7da75a8419684d9795e69fa259b6b89e9f09678dde8d941de74e7d3034e43a593a11ad7f1e
SSDEEP

196608:JMhP4WgzpUmKAUIo4z3wVSIPLFFrL0AGtWT6U:JyP2Zo40HLvL7Gty

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1253745341237301298/0bupEAbWw7WhJJNHQZuklnmeXgWr4vsCHwsXRKwqRFI02WfhfcKZFllI_i5uOwkWj_II

Signatures

Skuld family
skuld
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-1-5-21-4089630652-1596403869-279772308-1000\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 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

5 api.ipify.org
6 api.ipify.org
11 ip-api.com
GoLang User-Agent 1 IoCs
Uses default user-agent string defined by GoLang HTTP packages.

Processes:

description flow ioc

HTTP User-Agent header 12 Go-http-client/1.1

flow	ioc
5	api.ipify.org
6	api.ipify.org
11	ip-api.com

description	flow	ioc
HTTP User-Agent header	12	Go-http-client/1.1

Modifies system certificate store 2 TTPs 3 IoCs

evasion spyware trojan

Install Root Certificate

T1553.004

Modify Registry

T1112

Processes:

main.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C	main.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	main.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\B1BC968BD4F49D622AA89A81F2150152A41D829C\Blob = 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	main.exe

Suspicious use of AdjustPrivilegeToken 43 IoCs

Processes:

main.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	1432	main.exe
Token: SeIncreaseQuotaPrivilege	1456	wmic.exe
Token: SeSecurityPrivilege	1456	wmic.exe
Token: SeTakeOwnershipPrivilege	1456	wmic.exe
Token: SeLoadDriverPrivilege	1456	wmic.exe
Token: SeSystemProfilePrivilege	1456	wmic.exe
Token: SeSystemtimePrivilege	1456	wmic.exe
Token: SeProfSingleProcessPrivilege	1456	wmic.exe
Token: SeIncBasePriorityPrivilege	1456	wmic.exe
Token: SeCreatePagefilePrivilege	1456	wmic.exe
Token: SeBackupPrivilege	1456	wmic.exe
Token: SeRestorePrivilege	1456	wmic.exe
Token: SeShutdownPrivilege	1456	wmic.exe
Token: SeDebugPrivilege	1456	wmic.exe
Token: SeSystemEnvironmentPrivilege	1456	wmic.exe
Token: SeRemoteShutdownPrivilege	1456	wmic.exe
Token: SeUndockPrivilege	1456	wmic.exe
Token: SeManageVolumePrivilege	1456	wmic.exe
Token: 33	1456	wmic.exe
Token: 34	1456	wmic.exe
Token: 35	1456	wmic.exe
Token: 36	1456	wmic.exe
Token: SeIncreaseQuotaPrivilege	1456	wmic.exe
Token: SeSecurityPrivilege	1456	wmic.exe
Token: SeTakeOwnershipPrivilege	1456	wmic.exe
Token: SeLoadDriverPrivilege	1456	wmic.exe
Token: SeSystemProfilePrivilege	1456	wmic.exe
Token: SeSystemtimePrivilege	1456	wmic.exe
Token: SeProfSingleProcessPrivilege	1456	wmic.exe
Token: SeIncBasePriorityPrivilege	1456	wmic.exe
Token: SeCreatePagefilePrivilege	1456	wmic.exe
Token: SeBackupPrivilege	1456	wmic.exe
Token: SeRestorePrivilege	1456	wmic.exe
Token: SeShutdownPrivilege	1456	wmic.exe
Token: SeDebugPrivilege	1456	wmic.exe
Token: SeSystemEnvironmentPrivilege	1456	wmic.exe
Token: SeRemoteShutdownPrivilege	1456	wmic.exe
Token: SeUndockPrivilege	1456	wmic.exe
Token: SeManageVolumePrivilege	1456	wmic.exe
Token: 33	1456	wmic.exe
Token: 34	1456	wmic.exe
Token: 35	1456	wmic.exe
Token: 36	1456	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

main.exe

description	pid	process	target process
PID 1432 wrote to memory of 1096	1432	main.exe	attrib.exe
PID 1432 wrote to memory of 1096	1432	main.exe	attrib.exe
PID 1432 wrote to memory of 4540	1432	main.exe	attrib.exe
PID 1432 wrote to memory of 4540	1432	main.exe	attrib.exe
PID 1432 wrote to memory of 1456	1432	main.exe	wmic.exe
PID 1432 wrote to memory of 1456	1432	main.exe	wmic.exe

Views/modifies file attributes 1 TTPs 2 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exeattrib.exe

pid process

1096 attrib.exe
4540 attrib.exe

pid	process
1096	attrib.exe
4540	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
- Modifies system certificate store
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1432

C:\Windows\system32\attrib.exe
attrib +h +s C:\Users\Admin\AppData\Local\Temp\main.exe
2⤵
- Views/modifies file attributes
PID:1096

C:\Windows\system32\attrib.exe
attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
2⤵
- Views/modifies file attributes
PID:4540

C:\Windows\System32\Wbem\wmic.exe
wmic csproduct get UUID
2⤵
- Suspicious use of AdjustPrivilegeToken
PID:1456

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Hide Artifacts

1

T1564

Hidden Files and Directories

Modify Registry

Subvert Trust Controls

1

T1553

Install Root Certificate

1

T1553.004

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
14.2MB

MD5
32555cfe5d6baeaf6a7fe7bb7fb65b2c

SHA1
d96b09517a45fdbcb852751dadbf6f8ba880c809

SHA256
7514379d03a14596ecf9e1a378d844d90314561d660e0c3947131e279fa27f73

SHA512
53ff705e8180255fed91da6d1e671b4cdd5d9bb837679748d54acb7da75a8419684d9795e69fa259b6b89e9f09678dde8d941de74e7d3034e43a593a11ad7f1e

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads