Analysis

  • max time kernel
    90s
  • max time network
    124s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    07-06-2024 08:23

General

  • Target

    4295a58ca53b10e4ce1ebb13cfe303653bf9afb4e583d32e3790291bde572eac.exe

  • Size

    2.5MB

  • MD5

    9fa215b1fe2fd1547f3a3d4f78c444f2

  • SHA1

    e3e49c4dfbdc180b7a0b190b798989a5ba3df63c

  • SHA256

    4295a58ca53b10e4ce1ebb13cfe303653bf9afb4e583d32e3790291bde572eac

  • SHA512

    08fc7e4c22b8d087c2b36f1f22792dc306c667f28c080e2c5f879e6d700f7ccf4c4bb34e22b3cafdaaca89e88e011d58eb542b2f7666cfc7f35b923f7cbd4cce

  • SSDEEP

    49152:Zcm4081qpZBUbHEmJDsEAQACR07Q3byRD8aXY658:ZcmmqvBUbHtJfAw07QLyLn

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

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 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\4295a58ca53b10e4ce1ebb13cfe303653bf9afb4e583d32e3790291bde572eac.exe
    "C:\Users\Admin\AppData\Local\Temp\4295a58ca53b10e4ce1ebb13cfe303653bf9afb4e583d32e3790291bde572eac.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2084
    • C:\Users\Admin\AppData\Local\Temp\kat6225.tmp
      C:\Users\Admin\AppData\Local\Temp\kat6225.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:2200

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat6225.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/2084-0-0x00000000023B0000-0x00000000023B1000-memory.dmp

    Filesize

    4KB

  • memory/2084-2-0x00000000040D0000-0x0000000004233000-memory.dmp

    Filesize

    1.4MB

  • memory/2084-9-0x0000000000400000-0x000000000067A000-memory.dmp

    Filesize

    2.5MB

  • memory/2200-4-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2200-8-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2200-10-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2200-24-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2200-25-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2200-27-0x0000000026090000-0x00000000262EF000-memory.dmp

    Filesize

    2.4MB

  • memory/2200-42-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/2200-43-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB