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Analysis

  • max time kernel
    90s
  • max time network
    123s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    20/05/2024, 19:34

General

  • Target

    bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe

  • Size

    2.0MB

  • MD5

    bb874688b123e8843616a022dff6720e

  • SHA1

    a9e1869608531551a033133e69a97dff68e51af7

  • SHA256

    bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45

  • SHA512

    ec25376b516f4ce0c558c877e0c6a0f1e5efcf6eed1c196d0a8006a57da0e914711eff86b9645c7ceec4d07febe591cbecbdc708e9b3b1263d2215169aee68d9

  • SSDEEP

    49152:IFno/jfcJtTF+TxMoxc1TU+j+dAzGkiT:IFno/jUtIuoITsdZT

Malware Config

Extracted

Family

stealc

rc4.plain

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\bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe
    "C:\Users\Admin\AppData\Local\Temp\bb1bf98277f2f971ef5dd3d084b76db78e415aa3e43f67c069908eb4fd959a45.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4976
    • C:\Users\Admin\AppData\Local\Temp\kat44AA.tmp
      C:\Users\Admin\AppData\Local\Temp\kat44AA.tmp
      2⤵
      • Executes dropped EXE
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:2108

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\kat44AA.tmp

    Filesize

    861KB

    MD5

    66064dbdb70a5eb15ebf3bf65aba254b

    SHA1

    0284fd320f99f62aca800fb1251eff4c31ec4ed7

    SHA256

    6a94dbda2dd1edcff2331061d65e1baf09d4861cc7ba590c5ec754f3ac96a795

    SHA512

    b05c6c09ae7372c381fba591c3cb13a69a2451b9d38da1a95aac89413d7438083475d06796acb5440cd6ec65b030c9fa6cbdaa0d2fe91a926bae6499c360f17f

  • memory/2108-8-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2108-3-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2108-10-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2108-19-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2108-20-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2108-23-0x0000000028570000-0x00000000287CF000-memory.dmp

    Filesize

    2.4MB

  • memory/2108-37-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/2108-38-0x0000000000400000-0x0000000000646000-memory.dmp

    Filesize

    2.3MB

  • memory/4976-0-0x0000000002350000-0x0000000002351000-memory.dmp

    Filesize

    4KB

  • memory/4976-9-0x0000000000400000-0x0000000000602000-memory.dmp

    Filesize

    2.0MB

  • memory/4976-5-0x0000000004020000-0x0000000004169000-memory.dmp

    Filesize

    1.3MB