stealc | a2f94952c89ea440f82877365db5b4a5cf14a10e4168a22a92fce4a8fd98404f

Analysis

max time kernel
130s
max time network
99s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
17/05/2024, 16:05

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General

Target
file.exe
Size 363KB
Sample240517-tjpacafd89
SHA256 a2f94952c89ea440f82877365db5b4a5cf14a10e4168a22a92fce4a8fd98404f
MD5 75db6dfdebb9bf0d98acfc15f2219c62
SHA1 5bc1ceec4269b4e893f2b00c1c4b3c0cb42a3291
SHA512 b295c110369cb2c56d87aab45ff93961b076474d16ca9a7138ab3e6e7acbc8a13a2949dcbc88e6f2e96e4fae793e1793b3052c7ec390ee3d6cd517029583dd2f
SSDEEP 6144:1JhLSp8zWMtAJA0Z9aRlEiw+pVc4Amr7me33k/JNSdiaJIlsZa6n:pLSpmqKRw+84B7mA3aJE4aOAFn
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

stealc

rc4.plain

Signatures

Detect Vidar Stealer 11 IoCs

stealer

resource	yara_rule
behavioral2/memory/4876-1-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-4-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-6-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-10-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-11-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-28-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-29-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-45-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-46-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-57-0x0000000000400000-0x0000000000646000-memory.dmp	family_vidar_v7
behavioral2/memory/4876-58-0x0000000000400000-0x0000000000646000-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-1-5-21-540404634-651139247-2967210625-1000\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 local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
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 3384 set thread context of 4876	3384	file.exe	85

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
2756	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4876	RegAsm.exe
4876	RegAsm.exe
4876	RegAsm.exe
4876	RegAsm.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 3384 wrote to memory of 4876	3384	file.exe	85
PID 4876 wrote to memory of 2272	4876	RegAsm.exe	104
PID 4876 wrote to memory of 2272	4876	RegAsm.exe	104
PID 4876 wrote to memory of 2272	4876	RegAsm.exe	104
PID 2272 wrote to memory of 2756	2272	cmd.exe	106
PID 2272 wrote to memory of 2756	2272	cmd.exe	106
PID 2272 wrote to memory of 2756	2272	cmd.exe	106

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:3384
- 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:4876
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\JEGHDAFIDGDA" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2272
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2756

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/3384-0-0x00000000008F0000-0x00000000008F1000-memory.dmp

Download

memory/3384-2-0x00000000008F0000-0x00000000008F1000-memory.dmp

Download

memory/4876-1-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-4-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/4876-6-0x0000000000400000-0x0000000000646000-memory.dmp

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memory/4876-10-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-11-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-13-0x0000000019280000-0x00000000194DF000-memory.dmp

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memory/4876-28-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-29-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-45-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-46-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-57-0x0000000000400000-0x0000000000646000-memory.dmp

Download

memory/4876-58-0x0000000000400000-0x0000000000646000-memory.dmp

Download