Analysis

  • max time kernel
    68s
  • max time network
    68s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    30-05-2024 12:59

Errors

Reason
Machine shutdown

General

  • Target

    Beta.exe

  • Size

    3.1MB

  • MD5

    bb26a2979d9a61725f910422403ed4dd

  • SHA1

    b46d4a3a7f7253e1d7268c060702d301ebb36dd6

  • SHA256

    fb80d28a129184b6a273bd893aeee80765b6ec3eb617d90c6d32d0738bcbbfef

  • SHA512

    dfa1d068282cae728f6adf890065c0dcecbf9215646f50313d995afd209f52c07f3fd8e1e414c8712af1e2b5306ef453a9b6419f1c574dbd445acbc276426200

  • SSDEEP

    49152:ivEt62XlaSFNWPjljiFa2RoUYI9ihqKhHvJQMoGd9THHB72eh2NT:ivY62XlaSFNWPjljiFXRoUYImh5

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Astro-1

C2

arthurus36.duckdns.org:5555

Mutex

ad7cd985-5e2e-45a3-9246-b82449c7c4d8

Attributes
  • encryption_key

    6314C8C60AA1035CEB920FD38F0342E398BAF5D0

  • install_name

    cmdprmpt.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    systemdex

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in System32 directory 3 IoCs
  • Creates scheduled task(s) 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 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\Beta.exe
    "C:\Users\Admin\AppData\Local\Temp\Beta.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2032
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "systemdex" /sc ONLOGON /tr "C:\Windows\system32\cmdprmpt.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2080
    • C:\Windows\system32\cmdprmpt.exe
      "C:\Windows\system32\cmdprmpt.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2116
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "systemdex" /sc ONLOGON /tr "C:\Windows\system32\cmdprmpt.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2720
  • C:\Windows\explorer.exe
    "C:\Windows\explorer.exe"
    1⤵
      PID:2880
    • C:\Windows\system32\mstsc.exe
      "C:\Windows\system32\mstsc.exe"
      1⤵
      • Enumerates connected drives
      PID:2796
    • C:\Windows\system32\LogonUI.exe
      "LogonUI.exe" /flags:0x0
      1⤵
        PID:1520
      • C:\Windows\system32\LogonUI.exe
        "LogonUI.exe" /flags:0x1
        1⤵
          PID:2784

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Windows\System32\cmdprmpt.exe

          Filesize

          3.1MB

          MD5

          bb26a2979d9a61725f910422403ed4dd

          SHA1

          b46d4a3a7f7253e1d7268c060702d301ebb36dd6

          SHA256

          fb80d28a129184b6a273bd893aeee80765b6ec3eb617d90c6d32d0738bcbbfef

          SHA512

          dfa1d068282cae728f6adf890065c0dcecbf9215646f50313d995afd209f52c07f3fd8e1e414c8712af1e2b5306ef453a9b6419f1c574dbd445acbc276426200

        • memory/2032-0-0x000007FEF5863000-0x000007FEF5864000-memory.dmp

          Filesize

          4KB

        • memory/2032-1-0x0000000000DA0000-0x00000000010C4000-memory.dmp

          Filesize

          3.1MB

        • memory/2032-2-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

          Filesize

          9.9MB

        • memory/2032-9-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

          Filesize

          9.9MB

        • memory/2116-8-0x0000000000F30000-0x0000000001254000-memory.dmp

          Filesize

          3.1MB

        • memory/2116-10-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

          Filesize

          9.9MB

        • memory/2116-11-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

          Filesize

          9.9MB

        • memory/2116-12-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

          Filesize

          9.9MB

        • memory/2116-14-0x000007FEF5860000-0x000007FEF624C000-memory.dmp

          Filesize

          9.9MB