Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    21/12/2022, 09:30

General

  • Target

    file.exe

  • Size

    228KB

  • MD5

    20091ee69d9eb23ee2aa3becd51bcce5

  • SHA1

    40e4bcb11e27085acd8de48652e3d82c92734ca8

  • SHA256

    5780935eee86f38a3be302b8309f933d32676b128a8909b5e6d46f98cc10c7d9

  • SHA512

    056e96dc0ebf589c25b86fc0db7c07e0c8bc2e4e419d0f64ac8c47f56936480cfb88416dc94483b5452c010a140aa7b7e38eb7e5837bf2298fbd69567fe270ed

  • SSDEEP

    3072:q1bGLXLtf15nTv7zIzCysvTC47fipkV/mCl+AA/1L1TxJWzgKr/so:IALtLIzMrtKpkXduBTnWzz/

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 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). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1184
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zfeppcvv\
      2⤵
        PID:2008
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\szzdeoyj.exe" C:\Windows\SysWOW64\zfeppcvv\
        2⤵
          PID:472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zfeppcvv binPath= "C:\Windows\SysWOW64\zfeppcvv\szzdeoyj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:516
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zfeppcvv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zfeppcvv
          2⤵
          • Launches sc.exe
          PID:1568
        • 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:344
      • C:\Windows\SysWOW64\zfeppcvv\szzdeoyj.exe
        C:\Windows\SysWOW64\zfeppcvv\szzdeoyj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:824
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1008
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1384

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

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

        Filesize

        13.8MB

        MD5

        4bcdacc4aa16d076c8ab7584cd71c41a

        SHA1

        fc7d4e439e6dca012f4767c114f159341cb0b935

        SHA256

        3719bb58dec9c2e7070f320e249ac1827c39dcc6a96d016561768d15f1944881

        SHA512

        d50d1bde3ca7c8b71c24c6dee86165e316d67808d402e637efc6c5a8636d4af535b8ced0c58abb17044e1c66da83da7a86e2d4b998c5238baf8c700fa18e824c

      • C:\Windows\SysWOW64\zfeppcvv\szzdeoyj.exe

        Filesize

        13.8MB

        MD5

        4bcdacc4aa16d076c8ab7584cd71c41a

        SHA1

        fc7d4e439e6dca012f4767c114f159341cb0b935

        SHA256

        3719bb58dec9c2e7070f320e249ac1827c39dcc6a96d016561768d15f1944881

        SHA512

        d50d1bde3ca7c8b71c24c6dee86165e316d67808d402e637efc6c5a8636d4af535b8ced0c58abb17044e1c66da83da7a86e2d4b998c5238baf8c700fa18e824c

      • memory/824-79-0x0000000000400000-0x0000000000462000-memory.dmp

        Filesize

        392KB

      • memory/824-76-0x00000000002C8000-0x00000000002D9000-memory.dmp

        Filesize

        68KB

      • memory/824-66-0x00000000002C8000-0x00000000002D9000-memory.dmp

        Filesize

        68KB

      • memory/1008-72-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1008-81-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1008-100-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1008-97-0x00000000005C0000-0x00000000005C7000-memory.dmp

        Filesize

        28KB

      • memory/1008-94-0x0000000005410000-0x000000000581B000-memory.dmp

        Filesize

        4.0MB

      • memory/1008-91-0x00000000001B0000-0x00000000001B5000-memory.dmp

        Filesize

        20KB

      • memory/1008-88-0x00000000001A0000-0x00000000001B0000-memory.dmp

        Filesize

        64KB

      • memory/1008-85-0x0000000000190000-0x0000000000196000-memory.dmp

        Filesize

        24KB

      • memory/1008-74-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/1008-82-0x0000000001980000-0x0000000001B8F000-memory.dmp

        Filesize

        2.1MB

      • memory/1184-69-0x0000000000400000-0x0000000000462000-memory.dmp

        Filesize

        392KB

      • memory/1184-55-0x0000000076AE1000-0x0000000076AE3000-memory.dmp

        Filesize

        8KB

      • memory/1184-54-0x0000000000578000-0x0000000000589000-memory.dmp

        Filesize

        68KB

      • memory/1184-59-0x0000000000400000-0x0000000000462000-memory.dmp

        Filesize

        392KB

      • memory/1184-68-0x0000000000578000-0x0000000000589000-memory.dmp

        Filesize

        68KB

      • memory/1184-58-0x0000000000230000-0x0000000000243000-memory.dmp

        Filesize

        76KB

      • memory/1184-57-0x0000000000578000-0x0000000000589000-memory.dmp

        Filesize

        68KB

      • memory/1384-101-0x0000000000250000-0x0000000000341000-memory.dmp

        Filesize

        964KB

      • memory/1384-103-0x0000000000250000-0x0000000000341000-memory.dmp

        Filesize

        964KB