stealc | 8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d

Analysis

max time kernel
146s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
12/06/2024, 09:27

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General

Target
8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe
Size 1.6MB
Sample240612-lezaraxdpm
SHA256 8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d
MD5 9beed9593d0a900179f23074ce9e4152
SHA1 23e3cfab2a8d97074485e5d720b24af9e9832cce
SHA512 5989fa641d359de2f88ed092b1aee8802a9e915a249f8645d0f3e7862b67c82b6c76ce3ad1b94ccf0d4b55d4d3001e54f6e2b134d30e33d7b7c5d3555c06694a
SSDEEP 24576:spM5863IGfTAVpalBwUfMxVVtes12FxwojKr98YGeGG9i:spQLYkTYp6BwUkxVVChjHZQs
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 9 IoCs

stealer

resource	yara_rule
behavioral2/memory/3720-2-0x0000000003FB0000-0x00000000040C0000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-9-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/4760-17-0x0000000000400000-0x0000000000648000-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
4760	kat6C08.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 3720 set thread context of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.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 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	kat6C08.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2428	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4760	kat6C08.tmp
4760	kat6C08.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 3720 wrote to memory of 4760	3720	8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe	77
PID 4760 wrote to memory of 3944	4760	kat6C08.tmp	79
PID 4760 wrote to memory of 3944	4760	kat6C08.tmp	79
PID 4760 wrote to memory of 3944	4760	kat6C08.tmp	79
PID 3944 wrote to memory of 2428	3944	cmd.exe	81
PID 3944 wrote to memory of 2428	3944	cmd.exe	81
PID 3944 wrote to memory of 2428	3944	cmd.exe	81

C:\Users\Admin\AppData\Local\Temp\8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe
"C:\Users\Admin\AppData\Local\Temp\8899e8437f5515677a632ad449e684252b36db465733efa6623659ed09f7a42d.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3720
- C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp
  C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4760
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat6C08.tmp" & rd /s /q "C:\ProgramData\EGCGHCBKFCFB" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3944
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:2428

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

kat6C08.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat6C08.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/3720-0-0x0000000002300000-0x0000000002301000-memory.dmp

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memory/3720-2-0x0000000003FB0000-0x00000000040C0000-memory.dmp

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memory/3720-10-0x0000000000400000-0x0000000000594000-memory.dmp

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memory/4760-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-9-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-11-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-12-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/4760-17-0x0000000000400000-0x0000000000648000-memory.dmp

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