Analysis

  • max time kernel
    146s
  • 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
    07-06-2024 03:24

General

  • Target

    8d41ed1098d36b683b596721e46cc27f220ffd70aaa7d4b549971a98ae028422.exe

  • Size

    2.9MB

  • MD5

    b6051017ed03f7d9ffb08dfb4ce0d5f7

  • SHA1

    78cf4f8df8ce382681d7149b3d8710be2f21e210

  • SHA256

    8d41ed1098d36b683b596721e46cc27f220ffd70aaa7d4b549971a98ae028422

  • SHA512

    79dd3d3f23023376f0d95c66318942ddcc5e6558ad69964f94b18df1e9270ebf405a6e1449bae5b9929c61613beefaceb5fd3815c19128a83c569f890ea88b95

  • SSDEEP

    49152:rtpSxptE1AKnCBMS4cdR/z4+UVi4e9Crn:r/4nE1dCmKxx4e9Cb

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\8d41ed1098d36b683b596721e46cc27f220ffd70aaa7d4b549971a98ae028422.exe
    "C:\Users\Admin\AppData\Local\Temp\8d41ed1098d36b683b596721e46cc27f220ffd70aaa7d4b549971a98ae028422.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4532
    • C:\Users\Admin\AppData\Local\Temp\kat472B.tmp
      C:\Users\Admin\AppData\Local\Temp\kat472B.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:1100

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat472B.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/1100-4-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/1100-8-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/1100-10-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/1100-15-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/1100-16-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/1100-18-0x0000000019400000-0x000000001965F000-memory.dmp

    Filesize

    2.4MB

  • memory/1100-33-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/1100-34-0x0000000000400000-0x0000000000648000-memory.dmp

    Filesize

    2.3MB

  • memory/4532-0-0x0000000002580000-0x0000000002581000-memory.dmp

    Filesize

    4KB

  • memory/4532-1-0x0000000004310000-0x0000000004476000-memory.dmp

    Filesize

    1.4MB

  • memory/4532-9-0x0000000000400000-0x00000000006EF000-memory.dmp

    Filesize

    2.9MB