Analysis

  • max time kernel
    127s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    18-12-2024 06:39

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    11563580013b8994395ff739dc37ed4a

  • SHA1

    c527a22166dc153687ca33a8d964687459a6b669

  • SHA256

    7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

  • SHA512

    4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59

  • SSDEEP

    49152:6vRt62XlaSFNWPjljiFa2RoUYIfu83oGNZZpTHHB72eh2NT:6vb62XlaSFNWPjljiFXRoUYIfuC

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.70:4782

Mutex

4cacefbd-58c1-418c-9da0-e646e1e6fc72

Attributes
  • encryption_key

    772212B3F3C08D6945CE72024D790AD46DD8341D

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    defender

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 9 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2984
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2728
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3008
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2740

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    11563580013b8994395ff739dc37ed4a

    SHA1

    c527a22166dc153687ca33a8d964687459a6b669

    SHA256

    7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

    SHA512

    4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59

  • memory/2984-0-0x000007FEF59E3000-0x000007FEF59E4000-memory.dmp

    Filesize

    4KB

  • memory/2984-1-0x0000000000D90000-0x00000000010B4000-memory.dmp

    Filesize

    3.1MB

  • memory/2984-2-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

    Filesize

    9.9MB

  • memory/2984-10-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

    Filesize

    9.9MB

  • memory/3008-8-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

    Filesize

    9.9MB

  • memory/3008-11-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

    Filesize

    9.9MB

  • memory/3008-9-0x0000000001270000-0x0000000001594000-memory.dmp

    Filesize

    3.1MB

  • memory/3008-12-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

    Filesize

    9.9MB