Analysis

  • max time kernel
    150s
  • max time network
    73s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • resource tags

    arch:x64arch:x86image:win7-20220414-enlocale:en-usos:windows7-x64system
  • submitted
    18-07-2022 11:22

General

  • Target

    bfaa90c6e3aacd9d9b83a4f8f0f74b0a.exe

  • Size

    534KB

  • MD5

    bfaa90c6e3aacd9d9b83a4f8f0f74b0a

  • SHA1

    85cc249e2cbf60761fb6de586a442bfc81052e36

  • SHA256

    6d00a6b8d581813e8af3114968274f89978b40d400c8eef2bf7e09192f5ec9e6

  • SHA512

    29d83e5f0e82f94c75874c382dc0c002ed90627b8441066c2dc2575ec1f6aff3973bc72915b767d5e54688da6043a3bcd294d26445d865462a11ddb88f0912a5

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

127.0.0.1:4782

Mutex

VNM_MUTEX_c2q7y2ayYutZ2XaYe7

Attributes
  • encryption_key

    NTih4UsOfv91J9azm70k

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Venom Client Startup

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 1 IoCs

    A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • VenomRAT

    VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

  • suricata: ET MALWARE Common RAT Connectivity Check Observed

    suricata: ET MALWARE Common RAT Connectivity Check Observed

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bfaa90c6e3aacd9d9b83a4f8f0f74b0a.exe
    "C:\Users\Admin\AppData\Local\Temp\bfaa90c6e3aacd9d9b83a4f8f0f74b0a.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    PID:1208

Network

MITRE ATT&CK Matrix

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/1208-54-0x0000000000830000-0x00000000008BC000-memory.dmp

    Filesize

    560KB

  • memory/1208-55-0x0000000075FB1000-0x0000000075FB3000-memory.dmp

    Filesize

    8KB