Analysis

  • max time kernel
    138s
  • max time network
    33s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    04-05-2023 12:31

General

  • Target

    arrow/8a3d555c8d1019b6d42721a2eea770d2101458fd70b208f6767db2eeb1cd44bc.exe

  • Size

    138KB

  • MD5

    d0488c635bdf39e3670bccb70e240ef9

  • SHA1

    3deb0acc0a9d72202e38d1afcae265d4671489d8

  • SHA256

    8a3d555c8d1019b6d42721a2eea770d2101458fd70b208f6767db2eeb1cd44bc

  • SHA512

    4370af21751cceffcbcdf37e9a6f36e404fd6eaab649e3dcb52a37fc0ee11c854539e08a711975f907b1c1ff577b9b13a659dfd0d008b089c26f85501e79a94f

  • SSDEEP

    3072:Obvt5mz7Bqh1v59Y08mAjs0Ltel+qOeJHlpV8b+Y/YG:Obv7S7BqjjYHdrqkL/

Malware Config

Extracted

Family

arrowrat

Botnet

21LTX5

C2

bigrussianfloppa.duckdns.org:1338

Mutex

M7SYHB

Signatures

  • ArrowRat

    Remote access tool with various capabilities first seen in late 2021.

  • Modifies Installed Components in the registry 2 TTPs 1 IoCs
  • Modifies registry class 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 21 IoCs
  • Suspicious use of AdjustPrivilegeToken 16 IoCs
  • Suspicious use of FindShellTrayWindow 27 IoCs
  • Suspicious use of SendNotifyMessage 17 IoCs
  • Suspicious use of WriteProcessMemory 46 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\arrow\8a3d555c8d1019b6d42721a2eea770d2101458fd70b208f6767db2eeb1cd44bc.exe
    "C:\Users\Admin\AppData\Local\Temp\arrow\8a3d555c8d1019b6d42721a2eea770d2101458fd70b208f6767db2eeb1cd44bc.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:996
    • C:\Windows\explorer.exe
      "C:\Windows\explorer.exe"
      2⤵
      • Modifies Installed Components in the registry
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of WriteProcessMemory
      PID:852
      • C:\Windows\system32\ctfmon.exe
        ctfmon.exe
        3⤵
          PID:1260
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
        2⤵
          PID:1204
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
          2⤵
            PID:1484
          • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
            "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
            2⤵
              PID:268
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
              "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
              2⤵
                PID:1212
              • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
                "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
                2⤵
                  PID:1876
                • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
                  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
                  2⤵
                    PID:1768
                  • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
                    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
                    2⤵
                      PID:1516
                    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
                      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
                      2⤵
                        PID:1340
                      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
                        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
                        2⤵
                          PID:1796
                        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
                          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe" 21LTX5 bigrussianfloppa.duckdns.org 1338 M7SYHB
                          2⤵
                            PID:560
                        • C:\Windows\system32\AUDIODG.EXE
                          C:\Windows\system32\AUDIODG.EXE 0x574
                          1⤵
                          • Suspicious use of AdjustPrivilegeToken
                          PID:1500

                        Network

                        MITRE ATT&CK Enterprise v6

                        Replay Monitor

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                        Downloads

                        • memory/852-55-0x00000000041E0000-0x00000000041E1000-memory.dmp

                          Filesize

                          4KB

                        • memory/852-56-0x00000000041E0000-0x00000000041E1000-memory.dmp

                          Filesize

                          4KB

                        • memory/852-60-0x00000000026D0000-0x00000000026E0000-memory.dmp

                          Filesize

                          64KB

                        • memory/996-54-0x0000000000F30000-0x0000000000F58000-memory.dmp

                          Filesize

                          160KB