General

  • Target

    SecuriteInfo.com.Trojan.DownLoaderNET.495.22282.26470.exe

  • Size

    9KB

  • Sample

    221103-rjd39sbbh4

  • MD5

    fd3c284eb862dfd89e4ea9c3188184b0

  • SHA1

    99b066e1b2bb568fb6d1813a2e06970cf164aec1

  • SHA256

    491c807f26e695af9ea8cb18cfbee96446d4f6703f774269a36cd887561dae8d

  • SHA512

    3a455fbd2dda97ee0afdbe55c4fc0f08aa2444c9a246d5b8f44709b276abf52fee7f9285099314b0afa4cedac194effe5d6d9e9c9255c31c95a1dc6c31571e74

  • SSDEEP

    192:K0E+Ig32cL1UuZRSrTW/2c8stYcFmVc03KY:K0E+Ig32cLWISrTWOcptYcFmVc03K

Malware Config

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

      SecuriteInfo.com.Trojan.DownLoaderNET.495.22282.26470.exe

    • Size

      9KB

    • MD5

      fd3c284eb862dfd89e4ea9c3188184b0

    • SHA1

      99b066e1b2bb568fb6d1813a2e06970cf164aec1

    • SHA256

      491c807f26e695af9ea8cb18cfbee96446d4f6703f774269a36cd887561dae8d

    • SHA512

      3a455fbd2dda97ee0afdbe55c4fc0f08aa2444c9a246d5b8f44709b276abf52fee7f9285099314b0afa4cedac194effe5d6d9e9c9255c31c95a1dc6c31571e74

    • SSDEEP

      192:K0E+Ig32cL1UuZRSrTW/2c8stYcFmVc03KY:K0E+Ig32cLWISrTWOcptYcFmVc03K

    • 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