Analysis

  • max time kernel
    27s
  • max time network
    34s
  • platform
    windows10-1703_x64
  • resource
    win10-20220812-en
  • resource tags

    arch:x64arch:x86image:win10-20220812-enlocale:en-usos:windows10-1703-x64system
  • submitted
    19/01/2023, 20:22

General

  • Target

    l1yprr.ps1

  • Size

    5.1MB

  • MD5

    861b5567c79e55d2a3c704a9bbece9dc

  • SHA1

    8ba826c4760bc5e39b41bb0bfead46c4792a3607

  • SHA256

    6f890fdcdb5267b92b3b793ff8b17484bc1a6a4107a68f2b4282d386225b63f1

  • SHA512

    dd153c269f4b2505449dcc52219f419514dd9aeb312eae4b04140ac0e7662675286044874fb665e900b433c95728c476dc3ee03a919671bea3f8f6635b0a8400

  • SSDEEP

    49152:fY1wOeTfeinwRg0Yd0YtWdR2++BqkPiblNmBZOqsHtL3rdyW6JKHINYMpnkq/3+/:y

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

ghcc.duckdns.org:4782

Mutex

a9c03eb7-f3c1-4b9e-a4f7-1962d17a793b

Attributes
  • encryption_key

    B0326395AC2D48856CAE22978A087DF5DCF5816D

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Update

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Suspicious use of SetThreadContext 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 behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\l1yprr.ps1
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2500
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4896
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4932

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/2500-122-0x000001F134840000-0x000001F134862000-memory.dmp

    Filesize

    136KB

  • memory/2500-127-0x000001F1349F0000-0x000001F134A66000-memory.dmp

    Filesize

    472KB

  • memory/2500-130-0x000001F134C20000-0x000001F135000000-memory.dmp

    Filesize

    3.9MB

  • memory/2500-131-0x000001F134A70000-0x000001F134B0C000-memory.dmp

    Filesize

    624KB

  • memory/4896-138-0x0000000000400000-0x0000000000484000-memory.dmp

    Filesize

    528KB

  • memory/4896-141-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-142-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-143-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-144-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-145-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-146-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-147-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-148-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-149-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-150-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-152-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-151-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-153-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-154-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-155-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-157-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-156-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-158-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-159-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-160-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-161-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-162-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-163-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-164-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-166-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-167-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-168-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-169-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-170-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-171-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-172-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-173-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-165-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-174-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-175-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-176-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-178-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-177-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-180-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-179-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-181-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-182-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-183-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-184-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-185-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-186-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-187-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-188-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-189-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-190-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-191-0x0000000005D10000-0x000000000620E000-memory.dmp

    Filesize

    5.0MB

  • memory/4896-192-0x00000000058B0000-0x0000000005942000-memory.dmp

    Filesize

    584KB

  • memory/4896-193-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-194-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-195-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-196-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-197-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-198-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-199-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-200-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-201-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-202-0x0000000005810000-0x000000000581A000-memory.dmp

    Filesize

    40KB

  • memory/4896-203-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-204-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-205-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB

  • memory/4896-225-0x0000000006B20000-0x0000000007126000-memory.dmp

    Filesize

    6.0MB

  • memory/4896-227-0x00000000065E0000-0x0000000006630000-memory.dmp

    Filesize

    320KB

  • memory/4896-228-0x0000000006830000-0x00000000068E2000-memory.dmp

    Filesize

    712KB

  • memory/4896-256-0x0000000007BE0000-0x0000000007C46000-memory.dmp

    Filesize

    408KB

  • memory/4932-207-0x0000000077580000-0x000000007770E000-memory.dmp

    Filesize

    1.6MB