Analysis

  • max time kernel
    329s
  • max time network
    331s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240730-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-07-2024 17:26

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    8b390eb4d2dc32a82c6b8047504fa532

  • SHA1

    5c6d6b99771b1301002a2a89e8567c8e5d8149d4

  • SHA256

    aeeedbe5a56241a34a9761b5517a8648cadee5d583b2fe77d7beb1f030b0c9c3

  • SHA512

    3586923bedc527240bcb6b23d5a55bd55922dc4a2d3a6f7b68bda00d34abb3d473c34ef161199e2515bb8e82536ffc666b91f35f96101395ab6620b20ab13a27

  • SSDEEP

    49152:pHobtR1o2PmNXo7WCr5sN4Rw8IgXrYdSBewTHHB72eh2NT:pHmRvmNXo7WCr5lw8tVB

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

147.185.221.20:18563

147.185.221.20:9835

Mutex

c2e1b18a-ce93-436d-ad8b-21bf89015e19

Attributes
  • encryption_key

    9E968F05BD874BA1BE086FD1774A027473823F49

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Enumerates physical storage devices 1 TTPs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 7 IoCs
  • Suspicious use of SendNotifyMessage 7 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    PID:4276
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ofwAbWfkKGAU.bat" "
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:620
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2892
        • C:\Windows\system32\PING.EXE
          ping -n 10 localhost
          3⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Runs ping.exe
          PID:1760

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\ofwAbWfkKGAU.bat

      Filesize

      213B

      MD5

      cb3a40f30bc0a8677abbdb3d6a4f9d50

      SHA1

      1f2df8bfae3612f962f250fe9a6ebbab1725f975

      SHA256

      677707cc52528faf159d3b77b11046b3f85edb83f6cdca28133bfe917ad3a0b6

      SHA512

      39d84f8795f0465dcaabe83b5eb3e526b0f03bf419a9648f4bea394172e30bc91889fb2c1fd24c04f810783300f868157c2734999c11bbab7c5bddd2328cb6da

    • memory/4276-0-0x00007FFE1F5C3000-0x00007FFE1F5C5000-memory.dmp

      Filesize

      8KB

    • memory/4276-1-0x0000000000BB0000-0x0000000000ED4000-memory.dmp

      Filesize

      3.1MB

    • memory/4276-2-0x00007FFE1F5C0000-0x00007FFE20081000-memory.dmp

      Filesize

      10.8MB

    • memory/4276-3-0x000000001C5D0000-0x000000001C620000-memory.dmp

      Filesize

      320KB

    • memory/4276-4-0x000000001C6E0000-0x000000001C792000-memory.dmp

      Filesize

      712KB

    • memory/4276-5-0x000000001C5A0000-0x000000001C5B2000-memory.dmp

      Filesize

      72KB

    • memory/4276-6-0x000000001C660000-0x000000001C69C000-memory.dmp

      Filesize

      240KB

    • memory/4276-7-0x00007FFE1F5C3000-0x00007FFE1F5C5000-memory.dmp

      Filesize

      8KB

    • memory/4276-8-0x00007FFE1F5C0000-0x00007FFE20081000-memory.dmp

      Filesize

      10.8MB

    • memory/4276-14-0x00007FFE1F5C0000-0x00007FFE20081000-memory.dmp

      Filesize

      10.8MB