stealc | 3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db

Analysis

max time kernel
42s
max time network
53s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
11/06/2024, 22:05

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General

Target
3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe
Size 1.6MB
Sample240611-1zzjkstdje
SHA256 3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db
MD5 5d0876295979b0f1809d4e6e14fef74c
SHA1 1f53a89052de40ba996a72fe6ae4c59e0707332a
SHA512 b54d28b4e651b3b261fe682ae763ea6d7f39969d33bf2e63dc7aa4be78325ca3501240f5f2648d3836616a81eb8ffcb13c85ef7a9138a07db21fde11cadcbabd
SSDEEP 24576:spM5863IGfTAVpalBZUfMxVVtes12FxwojKr98YGeGG9i:spQLYkTYp6BZUkxVVChjHZQs
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/3032-1-0x0000000002A40000-0x0000000002B50000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-8-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-10-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-4-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-11-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-12-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-13-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-14-0x0000000000400000-0x0000000000648000-memory.dmp	family_vidar_v7
behavioral2/memory/1208-15-0x0000000000400000-0x0000000000648000-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
1208	kat783D.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 3032 set thread context of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80

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	kat783D.tmp

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
720	timeout.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1208	kat783D.tmp
1208	kat783D.tmp

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 3032 wrote to memory of 1208	3032	3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe	80
PID 1208 wrote to memory of 796	1208	kat783D.tmp	82
PID 1208 wrote to memory of 796	1208	kat783D.tmp	82
PID 1208 wrote to memory of 796	1208	kat783D.tmp	82
PID 796 wrote to memory of 720	796	cmd.exe	84
PID 796 wrote to memory of 720	796	cmd.exe	84
PID 796 wrote to memory of 720	796	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe
"C:\Users\Admin\AppData\Local\Temp\3bce80b6c6e7ccb7f21bd63f9b777078514d5118efa12376efc2142bc7ed13db.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3032
- C:\Users\Admin\AppData\Local\Temp\kat783D.tmp
  C:\Users\Admin\AppData\Local\Temp\kat783D.tmp
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1208
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat783D.tmp" & rd /s /q "C:\ProgramData\HCGCBFHCFCFB" & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:796
  - - C:\Windows\SysWOW64\timeout.exe
      timeout /t 10
      4⤵
      Delays execution with timeout.exe
      PID:720

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

kat783D.tmp

Path C:\Users\Admin\AppData\Local\Temp\kat783D.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/1208-8-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-10-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-4-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-11-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-12-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-13-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-14-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/1208-15-0x0000000000400000-0x0000000000648000-memory.dmp

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memory/3032-0-0x0000000002300000-0x0000000002301000-memory.dmp

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memory/3032-1-0x0000000002A40000-0x0000000002B50000-memory.dmp

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memory/3032-9-0x0000000000400000-0x0000000000594000-memory.dmp

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