Analysis

  • max time kernel
    141s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-06-2024 09:41

General

  • Target

    45c9f4972cd81d0eb03ebfc6a7e1f3d5b6be70a7be4bb31b0baa3c43491eb163.exe

  • Size

    1.8MB

  • MD5

    570928696721e1a33f784109cc578f82

  • SHA1

    a617c1e9f11086fe970e00c617f0b29470ef06c2

  • SHA256

    45c9f4972cd81d0eb03ebfc6a7e1f3d5b6be70a7be4bb31b0baa3c43491eb163

  • SHA512

    ddd9c28a9cdaf1ebc8eefd4424fdd8a5ce36782d895b62083c692475a17682d48f618d5613a77544f566f0952b35b023aa48d8f02ac2cd901e2c85365f8e2495

  • SSDEEP

    24576:W7YfUB7F1931tbjYaOV+rEfv0xwT3zxNOt4XigDSCuptNEynEsqqfD:W75B7FDFtbjYa8aesY3Ot4N7G/

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\45c9f4972cd81d0eb03ebfc6a7e1f3d5b6be70a7be4bb31b0baa3c43491eb163.exe
    "C:\Users\Admin\AppData\Local\Temp\45c9f4972cd81d0eb03ebfc6a7e1f3d5b6be70a7be4bb31b0baa3c43491eb163.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:536
    • C:\Users\Admin\AppData\Local\Temp\kat4292.tmp
      C:\Users\Admin\AppData\Local\Temp\kat4292.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:3940
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1408 --field-trial-handle=2744,i,16362475727591565961,3676688664819797550,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:532

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\kat4292.tmp

      Filesize

      861KB

      MD5

      66064dbdb70a5eb15ebf3bf65aba254b

      SHA1

      0284fd320f99f62aca800fb1251eff4c31ec4ed7

      SHA256

      6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

      SHA512

      b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

    • memory/536-0-0x0000000002350000-0x0000000002351000-memory.dmp

      Filesize

      4KB

    • memory/536-1-0x0000000000400000-0x00000000005CE000-memory.dmp

      Filesize

      1.8MB

    • memory/536-2-0x0000000000400000-0x00000000005CE000-memory.dmp

      Filesize

      1.8MB

    • memory/536-3-0x00000000040E0000-0x000000000422C000-memory.dmp

      Filesize

      1.3MB

    • memory/3940-11-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB

    • memory/3940-6-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB

    • memory/3940-12-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB

    • memory/3940-15-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB

    • memory/3940-16-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB

    • memory/3940-18-0x000000001B8C0000-0x000000001BB1F000-memory.dmp

      Filesize

      2.4MB

    • memory/3940-33-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB

    • memory/3940-34-0x0000000000400000-0x0000000000649000-memory.dmp

      Filesize

      2.3MB