Analysis

  • max time kernel
    142s
  • max time network
    127s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    02/08/2024, 23:37

General

  • Target

    c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe

  • Size

    4.1MB

  • MD5

    c1eb7dd6cf79b4abdaf4dbc4884feabb

  • SHA1

    ff9aa2c84c1940d4d1fa7d540b6b7e2f678e4caa

  • SHA256

    c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5

  • SHA512

    e3361143a7cb84e46eaea75feef4144a35405df98b9114e17fb589b1513fc2cc267d7049ee61719e5bc78f1689a6dbd588bcf4bfd16ee429a3df4a907a1993db

  • SSDEEP

    98304:Nof/+vuGSH8tO7SZ7g2yLt72d3AK8YJJ1zjrM8P885qodK:Gn6Sr7Sd2h72d7vXMc888o4

Malware Config

Signatures

  • Detect Socks5Systemz Payload 1 IoCs
  • Socks5Systemz

    Socks5Systemz is a botnet written in C++.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 1 IoCs
  • Unexpected DNS network traffic destination 1 IoCs

    Network traffic to other servers than the configured DNS servers was detected on the DNS port.

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe
    "C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2904
    • C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp" /SL5="$5030A,3984930,54272,C:\Users\Admin\AppData\Local\Temp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      PID:2964
      • C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
        "C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -i
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:4116
      • C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe
        "C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe" -s
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:1780

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\AC3Filter\ac3filter32_64.exe

          Filesize

          4.7MB

          MD5

          8bcca4ad183014fe5a930cd349e523d2

          SHA1

          5ca455d7e225d8bdb05bdf389f270b3b221affab

          SHA256

          cd0f7ae7590fc5e32c02c178c91252e285d03b55374e5513c127cda5aeb45c1b

          SHA512

          2f580af96c856150845c3b64b26453ed9e556d8c92aef651c96cf1adadd4ad908a1cb500636c18a06bda3ae64cfaa50255e398e6a2250abe6a5feb26a128abcf

        • C:\Users\Admin\AppData\Local\Temp\is-1UO6M.tmp\c91b5281a1c7d259ab877fffa3624075657b0c1d5313cd17f4a65995ebc6abb5.tmp

          Filesize

          692KB

          MD5

          849bb5c3439284a175f581ec281ca92e

          SHA1

          8bd0737eac1a74de4d62d66911ca7ed9f61cbc0f

          SHA256

          33a8f60e50240aecdbedc45922032025376ecccc0c1acbd44c82f12985e82206

          SHA512

          ac7bd629b6ed2595c6af4ef0737d7d801c8c35ebb4638ec2c19569511157a1543a6fa91d1a15708810865ece1cfb27367480754a7debf716d322d1eb59c5f625

        • C:\Users\Admin\AppData\Local\Temp\is-ELKHT.tmp\_isetup\_iscrypt.dll

          Filesize

          2KB

          MD5

          a69559718ab506675e907fe49deb71e9

          SHA1

          bc8f404ffdb1960b50c12ff9413c893b56f2e36f

          SHA256

          2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

          SHA512

          e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

        • memory/1780-88-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-91-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-107-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-104-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-100-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-97-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-59-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-94-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-85-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-62-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-65-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-66-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-69-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-72-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-75-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/1780-78-0x00000000026E0000-0x0000000002782000-memory.dmp

          Filesize

          648KB

        • memory/1780-80-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/2904-0-0x0000000000400000-0x0000000000414000-memory.dmp

          Filesize

          80KB

        • memory/2904-60-0x0000000000400000-0x0000000000414000-memory.dmp

          Filesize

          80KB

        • memory/2904-2-0x0000000000401000-0x000000000040B000-memory.dmp

          Filesize

          40KB

        • memory/2964-61-0x0000000000400000-0x00000000004BD000-memory.dmp

          Filesize

          756KB

        • memory/2964-12-0x0000000000400000-0x00000000004BD000-memory.dmp

          Filesize

          756KB

        • memory/4116-56-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/4116-52-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB

        • memory/4116-54-0x0000000000400000-0x00000000008B2000-memory.dmp

          Filesize

          4.7MB