Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250207-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250207-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-02-2025 19:12

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    528aac487e4cb55751f89428aa946f35

  • SHA1

    1d4a43e2df64526a88ba7a1e3abc4059d02bb6d2

  • SHA256

    c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884

  • SHA512

    c7d39ecf98a4dd2ba0cd7341ece289934e5e658e1006c4d7cb3713da4ca0bae6feb5a4e544c34c265673b5ea211c877f5b23b2dad15e89cf8502b695ba2742b9

  • SSDEEP

    49152:mv2I22SsaNYfdPBldt698dBcjHyxRcmCZLoed3UfyTHHB72eh2NT:mvb22SsaNYfdPBldt6+dBcjHyxRGR

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

sabaf-38910.portmap.host:38910

Mutex

f7356d60-951e-494a-a901-2e12bb084129

Attributes
  • encryption_key

    5C7AC20AEB149D8BC06141FCF79866AD6E3847AD

  • install_name

    RuntimeBroker.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    RunTimeBroker

  • subdirectory

    System32

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar family
  • Quasar payload 2 IoCs
  • Downloads MZ/PE file 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

    Adversaries may check for Internet connectivity on compromised systems.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

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:1500
    • C:\Windows\system32\System32\RuntimeBroker.exe
      "C:\Windows\system32\System32\RuntimeBroker.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      PID:2668
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4272
    • C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
      "C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSIyIiBpbnN0YWxsZGF0ZXRpbWU9IjE3Mzg5NDU5ODUiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4MzQxODQ0NDQzNjAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1Mzc2MjgwNDE5Ii8-PC9hcHA-PC9yZXF1ZXN0Pg
      1⤵
      • System Location Discovery: System Language Discovery
      • System Network Configuration Discovery: Internet Connection Discovery
      PID:3112

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Windows\System32\System32\RuntimeBroker.exe

      Filesize

      3.1MB

      MD5

      528aac487e4cb55751f89428aa946f35

      SHA1

      1d4a43e2df64526a88ba7a1e3abc4059d02bb6d2

      SHA256

      c8ccabab4b9bd78e4ddbd6e007a4d5472b90713eee4aff89cddb4f86d95b8884

      SHA512

      c7d39ecf98a4dd2ba0cd7341ece289934e5e658e1006c4d7cb3713da4ca0bae6feb5a4e544c34c265673b5ea211c877f5b23b2dad15e89cf8502b695ba2742b9

    • memory/1500-0-0x00007FFC525F3000-0x00007FFC525F5000-memory.dmp

      Filesize

      8KB

    • memory/1500-1-0x0000000000350000-0x0000000000674000-memory.dmp

      Filesize

      3.1MB

    • memory/1500-2-0x00007FFC525F0000-0x00007FFC530B1000-memory.dmp

      Filesize

      10.8MB

    • memory/1500-9-0x00007FFC525F0000-0x00007FFC530B1000-memory.dmp

      Filesize

      10.8MB

    • memory/2668-10-0x00007FFC525F0000-0x00007FFC530B1000-memory.dmp

      Filesize

      10.8MB

    • memory/2668-11-0x000000001C3B0000-0x000000001C400000-memory.dmp

      Filesize

      320KB

    • memory/2668-12-0x000000001CAC0000-0x000000001CB72000-memory.dmp

      Filesize

      712KB

    • memory/2668-13-0x00007FFC525F0000-0x00007FFC530B1000-memory.dmp

      Filesize

      10.8MB