stealc | b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0

Analysis

max time kernel
146s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
26/06/2024, 11:00

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General

Target
b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe
Size 1.5MB
Sample240626-m39bas1gmc
SHA256 b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0
MD5 af184a4a72cfd43393ec6329de1645b6
SHA1 9c3d9168eddb903b07cd46494694e399bab53860
SHA512 08e706cd0a1951681b9a6b97022534974ae1b11291367a6d28a1e820c5d256a9d7369317e5bdb95337080a079e94f1947f00cf16e8f82a9fc539428e374c439c
SSDEEP 24576:KK9MHjif9IJK3gBlsXbvLbLUJ70Uj654koEBETT2f1Y+TSXjk:K/jwaJKQl+bH4JbjzzEBETT29YMST
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

stealc vidar discovery spyware stealer

Malware Config

Extracted

Family

vidar

https://t.me/g067n
https://steamcommunity.com/profiles/76561199707802586

Attributes

user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:129.0) Gecko/20100101 Firefox/129.0

Signatures

Detect Vidar Stealer 9 IoCs

stealer

resource	yara_rule
behavioral2/memory/3716-2-0x0000000003FA0000-0x00000000040B0000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/2584-17-0x0000000000400000-0x0000000000648000-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

Executes dropped EXE 1 IoCs

pid	Process
2584	kat6CF2.tmp

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
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 3716 set thread context of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77

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 2 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	kat6CF2.tmp
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	kat6CF2.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4436	timeout.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2584	kat6CF2.tmp
2584	kat6CF2.tmp
2584	kat6CF2.tmp
2584	kat6CF2.tmp
2584	kat6CF2.tmp
2584	kat6CF2.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 3716 wrote to memory of 2584	3716	b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe	77
PID 2584 wrote to memory of 836	2584	kat6CF2.tmp	79
PID 2584 wrote to memory of 836	2584	kat6CF2.tmp	79
PID 2584 wrote to memory of 836	2584	kat6CF2.tmp	79
PID 836 wrote to memory of 4436	836	cmd.exe	81
PID 836 wrote to memory of 4436	836	cmd.exe	81
PID 836 wrote to memory of 4436	836	cmd.exe	81

C:\Users\Admin\AppData\Local\Temp\b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe
"C:\Users\Admin\AppData\Local\Temp\b8640ca5227e5c1a7ba09c2294f093f648c2dd1daa476c9dd4dc64c84cefc2f0.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3716
- C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp
  C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2584
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\system32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp" & rd /s /q "C:\ProgramData\KJEBKJDAFHJD" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:836
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:4436

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

kat6CF2.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat6CF2.tmp
Size 861KB
SHA256 6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795
MD5 66064dbdb70a5eb15ebf3bf65aba254b
SHA1 0284fd320f99f62aca800fb1251eff4c31ec4ed7
SHA512 b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f
SSDEEP 24576:o0ESdQpglO1CxDyawn27h+9hrlgKQY9SGcZwCdTp:o0RIglO1CuL9VNcaCd9
MD5 SHA1 SHA512 SSDEEP

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memory/2584-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-10-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-11-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-12-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/2584-17-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/3716-0-0x00000000023C0000-0x00000000023C1000-memory.dmp

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memory/3716-2-0x0000000003FA0000-0x00000000040B0000-memory.dmp

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memory/3716-9-0x0000000000400000-0x0000000000590000-memory.dmp

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