General

  • Target
    Nº 2502268142.pdf .exe
  • Size 503KB
  • Sample251127-dn8xjsvkak
  • SHA256 cdefe4487062cf4feeee912c4842224c9f9ee066574205d31efa87aee71f2073
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • xworm

C2
  • rency.ydns.eu:59013

  • wqo9.firewall-gateway.de:59013

  • code1.ydns.eu:59013

Attributes
  • Install_directory

    %AppData%

  • install_file

    \WindowsSecurity\WindowsDefender.exe

Extracted

Family
  • remcos

Version
  • 3.8.0 Pro

Botnet
  • EXEC

C2
  • rency.ydns.eu:2404

  • wqo9.firewall-gateway.de:4045

  • code1.ydns.eu:9302

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    System.exe

  • copy_folder

    MicroSoft Outlook

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    TCWd3hQ5LP1Fcm2U5B0fn3xuWp5u5rQsC2Y-YNXB3C

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    MicroSoft

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • SPAIN2

C2
  • twart.myfirewall.org:9792

  • rency.ydns.eu:5287

  • wqo9.firewall-gateway.de:8841

  • code1.ydns.eu:5287

  • wqo9.firewall-gateway.de:9792

Mutex
  • Q4e9mb0d-11cb-44R6b-T1b-05f80M1dcIfx051

Attributes
  • encryption_key

    3145298725BA5E0DD56E87FFE3F8898EA81E6EDA

  • install_name

    Notepadbook.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    6000

  • startup_key

    Adobe PDF

  • subdirectory

    WindowsMD

Targets

    • Target
      Nº 2502268142.pdf .exe
    • Size 503KB
    • SHA256 cdefe4487062cf4feeee912c4842224c9f9ee066574205d31efa87aee71f2073
    • MD5 SHA1 SHA512 SSDEEP
    • Detect Xworm Payload

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar family

    • Quasar payload

    • Remcos

      Remcos is a closed-source remote control and surveillance software.

    • Remcos family

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Xworm family

    • Badlisted process makes network request

      Network request originating from process or tool commonly abused by malware.

    • Downloads MZ/PE file

    • .NET Reactor proctector

      Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads WinSCP keys stored on the system

      Tries to access WinSCP stored sessions.

    • 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

    • Obfuscated Files or Information: Command Obfuscation

      Adversaries may obfuscate content during command execution to impede detection.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v16

Tasks