Analysis

  • max time kernel
    185s
  • max time network
    190s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    01-07-2022 01:27

General

  • Target

    3f7bb036eef312a9c1fca60105f1b87235dc8b14d617e415f95a7043f9efe917.exe

  • Size

    137KB

  • MD5

    708dc91ee0b8a61718e9991a1396b23f

  • SHA1

    d7bd310fd1a8ba9500c00b4e7626aa780552d26c

  • SHA256

    3f7bb036eef312a9c1fca60105f1b87235dc8b14d617e415f95a7043f9efe917

  • SHA512

    569e90713153b268f2cdcb12e78156facdcda6e936ae45e0032d317efe9d8d442d53335ab7e37514cb800d9885d5c575209b2a64e098e69c4c4db20f927f7278

Malware Config

Extracted

Family

tofsee

C2

43.231.4.7

lazystax.ru

Signatures

  • Tofsee

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

  • 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
  • Suspicious use of SetThreadContext 1 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.

  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3f7bb036eef312a9c1fca60105f1b87235dc8b14d617e415f95a7043f9efe917.exe
    "C:\Users\Admin\AppData\Local\Temp\3f7bb036eef312a9c1fca60105f1b87235dc8b14d617e415f95a7043f9efe917.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mhfknafi\
      2⤵
        PID:2016
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qnykefj.exe" C:\Windows\SysWOW64\mhfknafi\
        2⤵
          PID:1344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mhfknafi binPath= "C:\Windows\SysWOW64\mhfknafi\qnykefj.exe /d\"C:\Users\Admin\AppData\Local\Temp\3f7bb036eef312a9c1fca60105f1b87235dc8b14d617e415f95a7043f9efe917.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mhfknafi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:772
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mhfknafi
          2⤵
          • Launches sc.exe
          PID:1884
        • 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:1288
      • C:\Windows\SysWOW64\mhfknafi\qnykefj.exe
        C:\Windows\SysWOW64\mhfknafi\qnykefj.exe /d"C:\Users\Admin\AppData\Local\Temp\3f7bb036eef312a9c1fca60105f1b87235dc8b14d617e415f95a7043f9efe917.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:540
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:1168

      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

      Modify Registry

      1
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        12.7MB

        MD5

        f60c2bd49b345b3d9e23db75cb5b19f2

        SHA1

        e29d3469ef25e8508813f7469c831877ce84403a

        SHA256

        53df958a811eaa426e28a57976c9cd40bd2d5ea11cc94edeb0a9d28788847e9d

        SHA512

        087019abd7a810fca5a7cb4f215091f59fe032dc34e01d129016ee09bf9da716299c854f89c25f52f06e6c1d251ed312e3f4d163a68ab3b82324de536052bbbb

      • C:\Windows\SysWOW64\mhfknafi\qnykefj.exe
        Filesize

        12.7MB

        MD5

        f60c2bd49b345b3d9e23db75cb5b19f2

        SHA1

        e29d3469ef25e8508813f7469c831877ce84403a

        SHA256

        53df958a811eaa426e28a57976c9cd40bd2d5ea11cc94edeb0a9d28788847e9d

        SHA512

        087019abd7a810fca5a7cb4f215091f59fe032dc34e01d129016ee09bf9da716299c854f89c25f52f06e6c1d251ed312e3f4d163a68ab3b82324de536052bbbb

      • memory/540-65-0x0000000000400000-0x0000000000425000-memory.dmp
        Filesize

        148KB

      • memory/696-58-0x0000000000000000-mapping.dmp
      • memory/772-59-0x0000000000000000-mapping.dmp
      • memory/1168-70-0x0000000000089A6B-mapping.dmp
      • memory/1168-67-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1168-69-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1168-73-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1168-74-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1168-75-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1288-62-0x0000000000000000-mapping.dmp
      • memory/1344-57-0x0000000000000000-mapping.dmp
      • memory/1648-55-0x0000000075761000-0x0000000075763000-memory.dmp
        Filesize

        8KB

      • memory/1648-54-0x0000000000400000-0x0000000000425000-memory.dmp
        Filesize

        148KB

      • memory/1884-61-0x0000000000000000-mapping.dmp
      • memory/2016-56-0x0000000000000000-mapping.dmp