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General

  • Target

    Doc01201763000.exe

  • Size

    2.9MB

  • Sample

    221007-lvgqmscba9

  • MD5

    6bdc2941aadda12fde04af72c227eadd

  • SHA1

    7ad28b6c109ae7ad534c3bef4664f4a5c4ff6310

  • SHA256

    6b4ae1bde5c68bdc96647dc1154eeea23eda290a970f8ddd9991a67337ab3689

  • SHA512

    47263631a93396d7f39257fc23a8fad7e48d3c2e37d75015b6de08c879ce78b10fe63cfc9e99733ef039bb4b22cf0e57a33f6e49ef2349d450f00a5cad4c3328

  • SSDEEP

    24576:bqri8YEiqPPnGIR4bYjQqeCAWqaRyMyV3rRP0rioqOnYQb6VOk9Zv8qAgq:

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

C2

rze6.sytes.net:5000

Mutex

QSR_MUTEX_nHkW3jdEs5SeHvgyZi

Attributes
  • encryption_key

    sweOMvDPhbI7lawcCiiU

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Extracted

Family

agenttesla

C2

http://195.178.120.72/ch1t/inc/c20966a2dd74ab.php

Targets

    • Target

      Doc01201763000.exe

    • Size

      2.9MB

    • MD5

      6bdc2941aadda12fde04af72c227eadd

    • SHA1

      7ad28b6c109ae7ad534c3bef4664f4a5c4ff6310

    • SHA256

      6b4ae1bde5c68bdc96647dc1154eeea23eda290a970f8ddd9991a67337ab3689

    • SHA512

      47263631a93396d7f39257fc23a8fad7e48d3c2e37d75015b6de08c879ce78b10fe63cfc9e99733ef039bb4b22cf0e57a33f6e49ef2349d450f00a5cad4c3328

    • SSDEEP

      24576:bqri8YEiqPPnGIR4bYjQqeCAWqaRyMyV3rRP0rioqOnYQb6VOk9Zv8qAgq:

    • AgentTesla

      Agent Tesla is a remote access tool (RAT) written in visual basic.

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • Executes dropped EXE

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Loads dropped DLL

    • Reads data files stored by FTP clients

      Tries to access configuration files associated with programs like FileZilla.

    • Reads user/profile data of local email clients

      Email clients store some user data on disk where infostealers will often target it.

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Accesses Microsoft Outlook profiles

    • Adds Run key to start application

    • Looks up external IP address via web service

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

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v6

Tasks