Analysis

  • max time kernel
    146s
  • max time network
    155s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    01-06-2024 07:39

General

  • Target

    6e5b34cf55d69f86e0b6404db41a0542a1c2eb27e3effb07781b056af6e7fe83.exe

  • Size

    2.4MB

  • MD5

    d4443519e2e81af0f0e936f42e91b0a2

  • SHA1

    f44089a0a4ef3527374950ec69a859411d8053a4

  • SHA256

    6e5b34cf55d69f86e0b6404db41a0542a1c2eb27e3effb07781b056af6e7fe83

  • SHA512

    6c2c3319dbaf7938d6616674e60438bb4670ff5d6888244b9f3a288d6ce5475954c0054f6f7d1b50b1bb855b0e8b16d6aab65e78c95753674b31202c14cea1d8

  • SSDEEP

    49152:wQc81KnB/a/hNT/dJYa8aesY3Ot4N7G/:wDta/hNT/dJn0etD/

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

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 8 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Suspicious use of SetThreadContext 1 IoCs
  • Checks processor information in registry 2 TTPs 1 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6e5b34cf55d69f86e0b6404db41a0542a1c2eb27e3effb07781b056af6e7fe83.exe
    "C:\Users\Admin\AppData\Local\Temp\6e5b34cf55d69f86e0b6404db41a0542a1c2eb27e3effb07781b056af6e7fe83.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3372
    • C:\Users\Admin\AppData\Local\Temp\kat8107.tmp
      C:\Users\Admin\AppData\Local\Temp\kat8107.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:4836

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat8107.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/3372-0-0x00000000023C0000-0x00000000023C1000-memory.dmp

    Filesize

    4KB

  • memory/3372-1-0x0000000004080000-0x00000000041CC000-memory.dmp

    Filesize

    1.3MB

  • memory/3372-9-0x0000000000400000-0x0000000000663000-memory.dmp

    Filesize

    2.4MB

  • memory/4836-8-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/4836-10-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/4836-4-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/4836-24-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/4836-25-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/4836-27-0x000000001B900000-0x000000001BB5F000-memory.dmp

    Filesize

    2.4MB

  • memory/4836-42-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/4836-43-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB