Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    03-06-2024 09:11

General

  • Target

    b782fd61519076914e32b5557ad707760cbd92bb4951d5fc43d5ffdf03c77cac.exe

  • Size

    1.8MB

  • MD5

    f2771dd0c13c1fc101058d55c61edf22

  • SHA1

    ebdd709487999f70c2b2cc7c515ce59c286f847e

  • SHA256

    b782fd61519076914e32b5557ad707760cbd92bb4951d5fc43d5ffdf03c77cac

  • SHA512

    6e423d8a61613351ae1f886a2aa91294138777dba6374e33ec01acdf26d37e9a90e146a33412ecb50cba5a0f990c623aebd74c4be65a1b7a3f7ca77fc5eecacd

  • SSDEEP

    24576:W7YfUB7F1931tbqYaOV+rEfv0xwT3zxNOt4XigDSCuptNEynEsqqfD:W75B7FDFtbqYa8aesY3Ot4N7G/

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\b782fd61519076914e32b5557ad707760cbd92bb4951d5fc43d5ffdf03c77cac.exe
    "C:\Users\Admin\AppData\Local\Temp\b782fd61519076914e32b5557ad707760cbd92bb4951d5fc43d5ffdf03c77cac.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2820
    • C:\Users\Admin\AppData\Local\Temp\kat6AA1.tmp
      C:\Users\Admin\AppData\Local\Temp\kat6AA1.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:1356

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat6AA1.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/1356-8-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/1356-10-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/1356-4-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/1356-24-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/1356-25-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/1356-27-0x0000000026040000-0x000000002629F000-memory.dmp

    Filesize

    2.4MB

  • memory/1356-42-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/1356-43-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/2820-0-0x0000000002460000-0x0000000002461000-memory.dmp

    Filesize

    4KB

  • memory/2820-2-0x00000000041D0000-0x000000000431C000-memory.dmp

    Filesize

    1.3MB

  • memory/2820-9-0x0000000000400000-0x00000000005CE000-memory.dmp

    Filesize

    1.8MB