skuld | 3ae5f379b6c0afa4937f933826611b2b5ff0e46e336fc7f7bb834088908577e3

Analysis

max time kernel
1s
max time network
4s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
07-08-2024 10:23

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

Nitro Gen.exe
Size

9.5MB
MD5

76c7b1e1231455421794cbab33917a08
SHA1

9e9ce71b8f3a9ee120995adc95b7415ec68f9735
SHA256

3ae5f379b6c0afa4937f933826611b2b5ff0e46e336fc7f7bb834088908577e3
SHA512

30e938c1df4061b8d5d301f610ece3901c7bf3c9e20e3ae3b6b92cbfd817da071cf0c055ef2c35197310233af899838a05068a2bdc497933f0c920ce1cedb3cf
SSDEEP

98304:lLhl+t9w5GRLGL+LhoE+3K4+lk0E/Bf7F/Bz2LIb:/Qt9w5MhoE+64+lkN/BjkIb

Score

10^/10

skuld persistence stealer

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1270610329910509661/G-pTJTr2wP2GnEHpB9tCwhElOzV_1yzxm7fjsyzlBzEIuLvzS6eVnaVtZWjPMtM7z92A

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-1-5-21-4106386276-4127174233-3637007343-1000\Software\Microsoft\Windows\CurrentVersion\Run\Realtek HD Audio Universal Service = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Protect\\SecurityHealthSystray.exe"	Nitro Gen.exe

Looks up external IP address via web service 2 IoCs

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

flow	ioc
1	api.ipify.org
2	api.ipify.org

Suspicious use of AdjustPrivilegeToken 43 IoCs

description	pid	Process
Token: SeDebugPrivilege	4268	Nitro Gen.exe
Token: SeIncreaseQuotaPrivilege	4104	wmic.exe
Token: SeSecurityPrivilege	4104	wmic.exe
Token: SeTakeOwnershipPrivilege	4104	wmic.exe
Token: SeLoadDriverPrivilege	4104	wmic.exe
Token: SeSystemProfilePrivilege	4104	wmic.exe
Token: SeSystemtimePrivilege	4104	wmic.exe
Token: SeProfSingleProcessPrivilege	4104	wmic.exe
Token: SeIncBasePriorityPrivilege	4104	wmic.exe
Token: SeCreatePagefilePrivilege	4104	wmic.exe
Token: SeBackupPrivilege	4104	wmic.exe
Token: SeRestorePrivilege	4104	wmic.exe
Token: SeShutdownPrivilege	4104	wmic.exe
Token: SeDebugPrivilege	4104	wmic.exe
Token: SeSystemEnvironmentPrivilege	4104	wmic.exe
Token: SeRemoteShutdownPrivilege	4104	wmic.exe
Token: SeUndockPrivilege	4104	wmic.exe
Token: SeManageVolumePrivilege	4104	wmic.exe
Token: 33	4104	wmic.exe
Token: 34	4104	wmic.exe
Token: 35	4104	wmic.exe
Token: 36	4104	wmic.exe
Token: SeIncreaseQuotaPrivilege	4104	wmic.exe
Token: SeSecurityPrivilege	4104	wmic.exe
Token: SeTakeOwnershipPrivilege	4104	wmic.exe
Token: SeLoadDriverPrivilege	4104	wmic.exe
Token: SeSystemProfilePrivilege	4104	wmic.exe
Token: SeSystemtimePrivilege	4104	wmic.exe
Token: SeProfSingleProcessPrivilege	4104	wmic.exe
Token: SeIncBasePriorityPrivilege	4104	wmic.exe
Token: SeCreatePagefilePrivilege	4104	wmic.exe
Token: SeBackupPrivilege	4104	wmic.exe
Token: SeRestorePrivilege	4104	wmic.exe
Token: SeShutdownPrivilege	4104	wmic.exe
Token: SeDebugPrivilege	4104	wmic.exe
Token: SeSystemEnvironmentPrivilege	4104	wmic.exe
Token: SeRemoteShutdownPrivilege	4104	wmic.exe
Token: SeUndockPrivilege	4104	wmic.exe
Token: SeManageVolumePrivilege	4104	wmic.exe
Token: 33	4104	wmic.exe
Token: 34	4104	wmic.exe
Token: 35	4104	wmic.exe
Token: 36	4104	wmic.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4268 wrote to memory of 2916	4268	Nitro Gen.exe	73
PID 4268 wrote to memory of 2916	4268	Nitro Gen.exe	73
PID 4268 wrote to memory of 2352	4268	Nitro Gen.exe	74
PID 4268 wrote to memory of 2352	4268	Nitro Gen.exe	74
PID 4268 wrote to memory of 4104	4268	Nitro Gen.exe	75
PID 4268 wrote to memory of 4104	4268	Nitro Gen.exe	75

Views/modifies file attributes 1 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2916	attrib.exe
2352	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Nitro Gen.exe
"C:\Users\Admin\AppData\Local\Temp\Nitro Gen.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4268
- C:\Windows\system32\attrib.exe
  attrib +h +s "C:\Users\Admin\AppData\Local\Temp\Nitro Gen.exe"
  2⤵
  - Views/modifies file attributes
  PID:2916
- C:\Windows\system32\attrib.exe
  attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
  2⤵
  - Views/modifies file attributes
  PID:2352
- C:\Windows\System32\Wbem\wmic.exe
  wmic csproduct get UUID
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4104

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

Loading Replay Monitor...

Downloads

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

Filesize
9.5MB

MD5
76c7b1e1231455421794cbab33917a08

SHA1
9e9ce71b8f3a9ee120995adc95b7415ec68f9735

SHA256
3ae5f379b6c0afa4937f933826611b2b5ff0e46e336fc7f7bb834088908577e3

SHA512
30e938c1df4061b8d5d301f610ece3901c7bf3c9e20e3ae3b6b92cbfd817da071cf0c055ef2c35197310233af899838a05068a2bdc497933f0c920ce1cedb3cf

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads