Analysis

  • max time kernel
    95s
  • max time network
    97s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-08-2024 04:23

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    4290449c878559b7cb44282906d40519

  • SHA1

    e5c1fd8659eab79d82ff98d71ec59712f175dbff

  • SHA256

    01b172d69a0ce6bdf3f29f89b58e18474d07d7c57f22ac4633fdb2cfa794cb6c

  • SHA512

    5001ed29fb746c1691bcd784b6ad88ae1a4e26fa614d62225330a1ae4fe5409be4637233ceb3e7615a4aee1977f3e82e94cf659f3f5f9c544db06e5d0c6e6efd

  • SSDEEP

    49152:NHobtR1o2PmNXo7WCr5Kg++OatXrYdLTHHB72eh2NT:NHmRvmNXo7WCr5Kg++OK

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 3 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 3 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:4912
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\KuBhliT3xyl5.bat" "
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1060
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:964
        • C:\Windows\system32\PING.EXE
          ping -n 10 localhost
          3⤵
          • System Network Configuration Discovery: Internet Connection Discovery
          • Runs ping.exe
          PID:3124
    • C:\Windows\system32\AUDIODG.EXE
      C:\Windows\system32\AUDIODG.EXE 0x45c 0x48c
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:644

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\KuBhliT3xyl5.bat

      Filesize

      213B

      MD5

      180e19ffa6762e8abd5db275adedb487

      SHA1

      5d5b8245ba751b2e4b2f9b0b80ecfae4d34a63d4

      SHA256

      34e014299a2f6344c12c2e8232e3bc5de7879f5f8afd2ed6f0b584cfc3a6c0fa

      SHA512

      2669d317223e2205121ae94af3cc0f05da0a56e24d83fa50ed3ba139e7eb08bcd781916b6128e638f21b25dbfd28ad0258b48bc8a67f4588f3a5f25703df28dc

    • memory/4912-0-0x00007FFCBAE03000-0x00007FFCBAE05000-memory.dmp

      Filesize

      8KB

    • memory/4912-1-0x0000000000510000-0x0000000000834000-memory.dmp

      Filesize

      3.1MB

    • memory/4912-2-0x00007FFCBAE00000-0x00007FFCBB8C1000-memory.dmp

      Filesize

      10.8MB

    • memory/4912-3-0x000000001BF20000-0x000000001BF70000-memory.dmp

      Filesize

      320KB

    • memory/4912-4-0x000000001C030000-0x000000001C0E2000-memory.dmp

      Filesize

      712KB

    • memory/4912-5-0x000000001BEF0000-0x000000001BF02000-memory.dmp

      Filesize

      72KB

    • memory/4912-6-0x000000001BFB0000-0x000000001BFEC000-memory.dmp

      Filesize

      240KB

    • memory/4912-7-0x00007FFCBAE03000-0x00007FFCBAE05000-memory.dmp

      Filesize

      8KB

    • memory/4912-8-0x00007FFCBAE00000-0x00007FFCBB8C1000-memory.dmp

      Filesize

      10.8MB

    • memory/4912-9-0x000000001CCE0000-0x000000001CD8A000-memory.dmp

      Filesize

      680KB

    • memory/4912-18-0x00007FFCBAE00000-0x00007FFCBB8C1000-memory.dmp

      Filesize

      10.8MB