Analysis

  • max time kernel
    176s
  • max time network
    218s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    25-06-2022 09:41

General

  • Target

    39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe

  • Size

    258KB

  • MD5

    7a717003f647ffa187853202db3cbe44

  • SHA1

    10b25fb91c1e200aba57b13ca96996a3a62dc77f

  • SHA256

    39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9

  • SHA512

    0c97a36671dd383481f665d910038404aa83b9e37cfcd127a08a7a57865b04450f19dc3a987d04b4e01aeed54835d126325042655e0116dfe12f687dd40b0577

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.

  • Windows security bypass 2 TTPs 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
  • 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\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe
    "C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1384
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fjuwrsdb\
      2⤵
        PID:1632
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ikfwnhoh.exe" C:\Windows\SysWOW64\fjuwrsdb\
        2⤵
          PID:1400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fjuwrsdb binPath= "C:\Windows\SysWOW64\fjuwrsdb\ikfwnhoh.exe /d\"C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fjuwrsdb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fjuwrsdb
          2⤵
          • Launches sc.exe
          PID:2028
        • 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:1744
      • C:\Windows\SysWOW64\fjuwrsdb\ikfwnhoh.exe
        C:\Windows\SysWOW64\fjuwrsdb\ikfwnhoh.exe /d"C:\Users\Admin\AppData\Local\Temp\39925d256ffb487c669d5c3bb768eba1f9cfa7595c7faf0947c9bcd52c2cf1c9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:676
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          PID:1724

      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\ikfwnhoh.exe
        Filesize

        14.5MB

        MD5

        5fbf73dd0d7698213ab594dfcecdbcce

        SHA1

        4621240d4b4d7ada237cc6caa135d596f518ae0b

        SHA256

        1c37fa35a0f241666590e7b94f24c638f929b2393f9a41cedd5ed78bb588e93a

        SHA512

        ce94c2aeb9af1279d5b97b855235b66e8e4ffe3a39408a7792eab0b14f56f7aa859750ef20bbeac2bfebb43c7c282174eb663b5c9032f38c9044d664fbfc602c

      • C:\Windows\SysWOW64\fjuwrsdb\ikfwnhoh.exe
        Filesize

        14.5MB

        MD5

        5fbf73dd0d7698213ab594dfcecdbcce

        SHA1

        4621240d4b4d7ada237cc6caa135d596f518ae0b

        SHA256

        1c37fa35a0f241666590e7b94f24c638f929b2393f9a41cedd5ed78bb588e93a

        SHA512

        ce94c2aeb9af1279d5b97b855235b66e8e4ffe3a39408a7792eab0b14f56f7aa859750ef20bbeac2bfebb43c7c282174eb663b5c9032f38c9044d664fbfc602c

      • memory/676-74-0x0000000000E06000-0x0000000000E17000-memory.dmp
        Filesize

        68KB

      • memory/676-77-0x0000000000400000-0x0000000000C47000-memory.dmp
        Filesize

        8.3MB

      • memory/676-68-0x0000000000E06000-0x0000000000E17000-memory.dmp
        Filesize

        68KB

      • memory/1384-57-0x0000000000D56000-0x0000000000D67000-memory.dmp
        Filesize

        68KB

      • memory/1384-58-0x0000000000400000-0x0000000000C47000-memory.dmp
        Filesize

        8.3MB

      • memory/1384-54-0x0000000000D56000-0x0000000000D67000-memory.dmp
        Filesize

        68KB

      • memory/1384-65-0x0000000000400000-0x0000000000C47000-memory.dmp
        Filesize

        8.3MB

      • memory/1384-55-0x0000000076011000-0x0000000076013000-memory.dmp
        Filesize

        8KB

      • memory/1400-59-0x0000000000000000-mapping.dmp
      • memory/1580-62-0x0000000000000000-mapping.dmp
      • memory/1632-56-0x0000000000000000-mapping.dmp
      • memory/1724-70-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1724-72-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1724-73-0x0000000000089A6B-mapping.dmp
      • memory/1724-79-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1724-80-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/1744-64-0x0000000000000000-mapping.dmp
      • memory/1764-61-0x0000000000000000-mapping.dmp
      • memory/2028-63-0x0000000000000000-mapping.dmp