stealc | a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d

Analysis

max time kernel
94s
max time network
95s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
08/06/2024, 07:23

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General

Target
a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe
Size 432KB
Sample240608-h77k2sbb27
SHA256 a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d
MD5 7dc8189f70cc34e18ea7af8fdeac4142
SHA1 8cb698efdf5971e0805dd0f0fb0457315490c777
SHA512 9bb17829724af371d383874b8ed4efe09f7f518fa131d68dd02ae0a149b0506f42b2694d7ec9a59b591b28fdcd620b68116e1170cd489b396d294126332e93ac
SSDEEP 6144:+uvXVvZjkQbsWSHZhP2YQih4Qsc14gY8f4en6hZpG+es7SJnXZfGBTaDsj48bR4B:5vdkQbjcps2+8uhAs64TR47EO
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

https://t.me/r8z0l
https://steamcommunity.com/profiles/76561199698764354

Attributes

user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Signatures

Detect Vidar Stealer 11 IoCs

stealer

resource	yara_rule
behavioral2/memory/4788-2-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-7-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-5-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-28-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-29-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-45-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-46-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-57-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4788-58-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7

Stealc
Stealc is an infostealer written in C++.
stealer stealc
Vidar
Vidar is an infostealer based on Arkei stealer.
stealer vidar
Downloads MZ/PE file

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Control Panel\International\Geo\Nation	RegAsm.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3368 set thread context of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 1 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	RegAsm.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1512	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4788	RegAsm.exe
4788	RegAsm.exe
4788	RegAsm.exe
4788	RegAsm.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 2084	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	81
PID 3368 wrote to memory of 2084	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	81
PID 3368 wrote to memory of 2084	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	81
PID 3368 wrote to memory of 3624	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	82
PID 3368 wrote to memory of 3624	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	82
PID 3368 wrote to memory of 3624	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	82
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 3368 wrote to memory of 4788	3368	a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe	83
PID 4788 wrote to memory of 1652	4788	RegAsm.exe	95
PID 4788 wrote to memory of 1652	4788	RegAsm.exe	95
PID 4788 wrote to memory of 1652	4788	RegAsm.exe	95
PID 1652 wrote to memory of 1512	1652	cmd.exe	97
PID 1652 wrote to memory of 1512	1652	cmd.exe	97
PID 1652 wrote to memory of 1512	1652	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe
"C:\Users\Admin\AppData\Local\Temp\a3608a51db9df14c42f8c6e37ac49969de70b4be0862d82b5823c00aed395f9d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3368
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2084
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:3624
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Checks computer location settings
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4788
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\AFHDHCAAKECF" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1652
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:1512

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/3368-0-0x0000000000EC0000-0x0000000000EC1000-memory.dmp

Download

memory/3368-1-0x0000000000EC0000-0x0000000000EC1000-memory.dmp

Download

memory/3368-3-0x0000000000EC0000-0x0000000000EC1000-memory.dmp

Download

memory/4788-2-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-7-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-5-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-10-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-11-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-13-0x000000001B430000-0x000000001B68F000-memory.dmp

Download

memory/4788-28-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-29-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-45-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-46-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-57-0x0000000000400000-0x0000000000648000-memory.dmp

Download

memory/4788-58-0x0000000000400000-0x0000000000648000-memory.dmp

Download