Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20240319-en
  • resource tags

    arch:x64arch:x86image:win7-20240319-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:34

General

  • Target

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe

  • Size

    227KB

  • MD5

    1010b86bd744c31ecef5f5aeae5ca6df

  • SHA1

    79dbaab22a85e8a0c3124d39423da1ca24c358e8

  • SHA256

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de

  • SHA512

    6823068623029c10aa0d833be8422b6d93663832d24298bd9811f7700bbc56dc5463fd75f12273e2168bac6784a16e735cc86cf0de8841e83c1befc75bdfd02d

  • SSDEEP

    3072:BG/VLLNVnlMoDjq0sg0lpb15L76ZhBUrIeGskK+KgPcf53whT5A/hTu:8Lh9ljdOlPB6tUrIK+zPcRaCpT

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe
    "C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2516
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fhdqnvvy\
      2⤵
        PID:2228
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fmlyggos.exe" C:\Windows\SysWOW64\fhdqnvvy\
        2⤵
          PID:2624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fhdqnvvy binPath= "C:\Windows\SysWOW64\fhdqnvvy\fmlyggos.exe /d\"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fhdqnvvy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2664
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fhdqnvvy
          2⤵
          • Launches sc.exe
          PID:2652
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:2644
      • C:\Windows\SysWOW64\fhdqnvvy\fmlyggos.exe
        C:\Windows\SysWOW64\fhdqnvvy\fmlyggos.exe /d"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2596
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2808

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\fmlyggos.exe

        Filesize

        12.1MB

        MD5

        a4058a6f982a9c1d7be8c90cb1bd0d6e

        SHA1

        c12474ac77dcea69ce42ac5ed327fb1e1093411c

        SHA256

        a2159fcba62705bc8368c943ffafe126648f8c177919f5b970cd41061bdf81ef

        SHA512

        97c1587137f703ce0611b13a216288b2cffcacddad7d3ad70efab16b70ca56e087a52fa549ec4fae728a3513ba3fd4f1c4396b4f80d55a2a4d753992de4173e6

      • memory/2516-2-0x0000000000240000-0x0000000000253000-memory.dmp

        Filesize

        76KB

      • memory/2516-4-0x0000000000400000-0x0000000002B11000-memory.dmp

        Filesize

        39.1MB

      • memory/2516-7-0x0000000000240000-0x0000000000253000-memory.dmp

        Filesize

        76KB

      • memory/2516-6-0x0000000000400000-0x0000000002B11000-memory.dmp

        Filesize

        39.1MB

      • memory/2516-1-0x0000000002CD0000-0x0000000002DD0000-memory.dmp

        Filesize

        1024KB

      • memory/2596-15-0x0000000000400000-0x0000000002B11000-memory.dmp

        Filesize

        39.1MB

      • memory/2596-10-0x0000000000230000-0x0000000000330000-memory.dmp

        Filesize

        1024KB

      • memory/2596-19-0x0000000000400000-0x0000000002B11000-memory.dmp

        Filesize

        39.1MB

      • memory/2808-34-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-39-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-20-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2808-14-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2808-21-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2808-22-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2808-24-0x0000000001BA0000-0x0000000001DAF000-memory.dmp

        Filesize

        2.1MB

      • memory/2808-27-0x0000000001BA0000-0x0000000001DAF000-memory.dmp

        Filesize

        2.1MB

      • memory/2808-28-0x00000000000E0000-0x00000000000E6000-memory.dmp

        Filesize

        24KB

      • memory/2808-31-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-35-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        Filesize

        4KB

      • memory/2808-36-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-37-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-38-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-11-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2808-42-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-43-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-41-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-40-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-46-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-47-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-45-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-48-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-51-0x0000000000260000-0x0000000000265000-memory.dmp

        Filesize

        20KB

      • memory/2808-54-0x0000000000260000-0x0000000000265000-memory.dmp

        Filesize

        20KB

      • memory/2808-50-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-49-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-44-0x00000000001D0000-0x00000000001E0000-memory.dmp

        Filesize

        64KB

      • memory/2808-55-0x0000000005940000-0x0000000005D4B000-memory.dmp

        Filesize

        4.0MB

      • memory/2808-58-0x0000000005940000-0x0000000005D4B000-memory.dmp

        Filesize

        4.0MB

      • memory/2808-59-0x0000000000270000-0x0000000000277000-memory.dmp

        Filesize

        28KB