stealc | 1c3aaf613bc3dd19508feb217795453863c6ad704336d4f598a7b3f245498c42

Analysis

max time kernel
134s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
31/05/2024, 16:03

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General

Target
file.exe
Size 413KB
Sample240531-thb9dsdd51
SHA256 1c3aaf613bc3dd19508feb217795453863c6ad704336d4f598a7b3f245498c42
MD5 5f7324abc929cdf64e87149e4a8768eb
SHA1 932c1e1901fb28eefd389d7abbee7b90d8f28f02
SHA512 6a8ec8ae6e0f1cf07f91df82234441ada0c099e2fa80ba2edce550364848c3597659c03828793e1607fc0f12c370c5fc97b08442aec2a027274b9de5b3dd7581
SSDEEP 12288:agOAzrgCIH1DmvQ81AEFinIMAhZDG/eIY3GIiDEO:agOIcCIVw1AoiCnO43GIIt
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/ta904ek
https://steamcommunity.com/profiles/76561199695752269

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/836-2-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-7-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-5-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-10-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-11-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-28-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-29-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-45-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-46-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-60-0x0000000000400000-0x0000000000649000-memory.dmp	family_vidar_v7
behavioral2/memory/836-61-0x0000000000400000-0x0000000000649000-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-1-5-21-4124900551-4068476067-3491212533-1000\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 2644 set thread context of 836	2644	file.exe	87

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
5000	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
836	RegAsm.exe
836	RegAsm.exe
836	RegAsm.exe
836	RegAsm.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 3356	2644	file.exe	86
PID 2644 wrote to memory of 3356	2644	file.exe	86
PID 2644 wrote to memory of 3356	2644	file.exe	86
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 2644 wrote to memory of 836	2644	file.exe	87
PID 836 wrote to memory of 3656	836	RegAsm.exe	98
PID 836 wrote to memory of 3656	836	RegAsm.exe	98
PID 836 wrote to memory of 3656	836	RegAsm.exe	98
PID 3656 wrote to memory of 5000	3656	cmd.exe	100
PID 3656 wrote to memory of 5000	3656	cmd.exe	100
PID 3656 wrote to memory of 5000	3656	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2644
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:3356
- 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:836
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\HCAAEGIJKEGH" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3656
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:5000

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

Replay Monitor

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Downloads

memory/836-10-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-29-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-61-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-2-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/836-7-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-5-0x0000000000400000-0x0000000000649000-memory.dmp

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memory/836-60-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-13-0x000000001AD10000-0x000000001AF6F000-memory.dmp

Download

memory/836-46-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-28-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-11-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/836-45-0x0000000000400000-0x0000000000649000-memory.dmp

Download

memory/2644-0-0x00000000009D0000-0x00000000009D1000-memory.dmp

Download

memory/2644-1-0x00000000009D0000-0x00000000009D1000-memory.dmp

Download

memory/2644-3-0x00000000009D0000-0x00000000009D1000-memory.dmp

Download