General

  • Target
    RFI155001002.exe
  • Size 30KB
  • Sample221031-mty4zaaff5
  • SHA256 f1eb46659645f95cf7b90059247cac5cd905e63a9c8852bb92380e8c7be4fdf2
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • agenttesla

C2
  • http://107.189.4.253/b22/inc/7097e0820fdf5c.php

Extracted

Family
  • quasar

Version
  • 1.3.0.0

Botnet
  • Nov

C2
  • 37.139.128.94:5000

Mutex
  • QSR_MUTEX_eZnYtXesrHquJP9u21

Attributes
  • encryption_key

    cnjVAVdqAEtq3rq2N0WD

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Targets

    • Target
      RFI155001002.exe
    • Size 30KB
    • SHA256 f1eb46659645f95cf7b90059247cac5cd905e63a9c8852bb92380e8c7be4fdf2
    • MD5 SHA1 SHA512 SSDEEP
    • 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