Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231127-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231127-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-12-2023 19:36

General

  • Target

    1fea532c75a33209f094f835261b4f579613a7b2ece7f046a11309d34537f8d5exe.exe

  • Size

    3.1MB

  • MD5

    e606a8d90dc0458e72508b428e950038

  • SHA1

    5ca61eaf0e2d26e1cf70ff2da183440fe2792081

  • SHA256

    1fea532c75a33209f094f835261b4f579613a7b2ece7f046a11309d34537f8d5

  • SHA512

    e0b0a4c33f9256415802beed59913b3db9b02b146eebd9f599abfd2099dc5a4695e2163c6b5a481ff6f52e68173463347b4cd2e5e238a01f75c0c06a79c04dc4

  • SSDEEP

    49152:evlt62XlaSFNWPjljiFa2RoUYItiRJ6CbR3LoGdWTHHB72eh2NT:evX62XlaSFNWPjljiFXRoUYItiRJ68

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

41.216.183.22:4782

Mutex

73d47cb4-df1b-4a92-9966-ab4a6e59fac1

Attributes
  • encryption_key

    9BB10B12B951D4020613CEC9F1D40DD2EE861BD7

  • install_name

    Office365.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Office365

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\1fea532c75a33209f094f835261b4f579613a7b2ece7f046a11309d34537f8d5exe.exe
    "C:\Users\Admin\AppData\Local\Temp\1fea532c75a33209f094f835261b4f579613a7b2ece7f046a11309d34537f8d5exe.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1496
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Office365" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Office365.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1304

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/1496-0-0x0000000000CE0000-0x0000000001004000-memory.dmp

    Filesize

    3.1MB

  • memory/1496-1-0x00007FF8DCEE0000-0x00007FF8DD9A1000-memory.dmp

    Filesize

    10.8MB

  • memory/1496-2-0x0000000001750000-0x0000000001760000-memory.dmp

    Filesize

    64KB

  • memory/1496-3-0x000000001BDD0000-0x000000001BE20000-memory.dmp

    Filesize

    320KB

  • memory/1496-4-0x000000001C480000-0x000000001C532000-memory.dmp

    Filesize

    712KB

  • memory/1496-5-0x00007FF8DCEE0000-0x00007FF8DD9A1000-memory.dmp

    Filesize

    10.8MB

  • memory/1496-6-0x0000000001750000-0x0000000001760000-memory.dmp

    Filesize

    64KB