Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    04/06/2024, 05:25

General

  • Target

    b927cb105caf0dfa39e7d095ab25d7ea53cc35e936fecea6e4a93d31174d1f58.exe

  • Size

    1.8MB

  • MD5

    ff7aa229821fdeab4283422f885a9ca6

  • SHA1

    a7acc05c0fa2242401de5ea4efa23b588ad2d439

  • SHA256

    b927cb105caf0dfa39e7d095ab25d7ea53cc35e936fecea6e4a93d31174d1f58

  • SHA512

    91b4e57b5fa1a81abb62c0ec1fbc37a23d4e7c92579f4035eaab6973f810679593e602fb57fd62b39c1751b83a9eae7d81ce5dd824e5b5c9fa31cb9d736c21e7

  • SSDEEP

    24576:W7YfUB7F1931tbwYaOV+rEfv0xwT3zxNOt4XigDSCuptNEynEsqqfD:W75B7FDFtbwYa8aesY3Ot4N7G/

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\b927cb105caf0dfa39e7d095ab25d7ea53cc35e936fecea6e4a93d31174d1f58.exe
    "C:\Users\Admin\AppData\Local\Temp\b927cb105caf0dfa39e7d095ab25d7ea53cc35e936fecea6e4a93d31174d1f58.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:5044
    • C:\Users\Admin\AppData\Local\Temp\kat8935.tmp
      C:\Users\Admin\AppData\Local\Temp\kat8935.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:3852

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat8935.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/3852-8-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/3852-10-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/3852-4-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/3852-15-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/3852-16-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/3852-18-0x000000001B870000-0x000000001BACF000-memory.dmp

    Filesize

    2.4MB

  • memory/3852-33-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/3852-34-0x0000000000400000-0x0000000000649000-memory.dmp

    Filesize

    2.3MB

  • memory/5044-0-0x0000000000790000-0x0000000000791000-memory.dmp

    Filesize

    4KB

  • memory/5044-1-0x0000000004000000-0x000000000414C000-memory.dmp

    Filesize

    1.3MB

  • memory/5044-9-0x0000000000400000-0x00000000005CE000-memory.dmp

    Filesize

    1.8MB