General

  • Target

    8bdfa3c37749a6ad28e52a1c32d709bcd3f423ffce77f2eb1fbabfad4f1732a1

  • Size

    994KB

  • Sample

    250214-kp5d3szlgz

  • MD5

    fd5f7cb05fed3f0ddf336b4d774233a9

  • SHA1

    38e64f34cd6e401464a9d3433eaba77717544ad4

  • SHA256

    8bdfa3c37749a6ad28e52a1c32d709bcd3f423ffce77f2eb1fbabfad4f1732a1

  • SHA512

    aa660ba760fc12feb886e5b94708e298f7c855e128d4f7c00054f78e014272d69f3c56186bd3a56a4d0d5623bfbe2a1df544941c5a10ca10ea8016e9ff9f6181

  • SSDEEP

    24576:oEPJIUv0nWZZwMAgqYUSE7tohH3iBNs9cc:FP0uAKfE7topcJc

Malware Config

Extracted

Family

quasar

Version

1.4.0.0

Botnet

Office

C2

85.192.29.60:5850

Mutex

tugm7GpNoIWBENfmpC

Attributes
  • encryption_key

    I54wSzWCzGjFo5K79lKk

  • install_name

    csrss.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    NET framework

  • subdirectory

    SubDir

Targets

    • Target

      8bdfa3c37749a6ad28e52a1c32d709bcd3f423ffce77f2eb1fbabfad4f1732a1

    • Size

      994KB

    • MD5

      fd5f7cb05fed3f0ddf336b4d774233a9

    • SHA1

      38e64f34cd6e401464a9d3433eaba77717544ad4

    • SHA256

      8bdfa3c37749a6ad28e52a1c32d709bcd3f423ffce77f2eb1fbabfad4f1732a1

    • SHA512

      aa660ba760fc12feb886e5b94708e298f7c855e128d4f7c00054f78e014272d69f3c56186bd3a56a4d0d5623bfbe2a1df544941c5a10ca10ea8016e9ff9f6181

    • SSDEEP

      24576:oEPJIUv0nWZZwMAgqYUSE7tohH3iBNs9cc:FP0uAKfE7topcJc

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar family

    • Quasar payload

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Downloads MZ/PE file

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Looks up external IP address via web service

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

    • Enumerates processes with tasklist

MITRE ATT&CK Enterprise v15

Tasks