Analysis

  • max time kernel
    148s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    03-07-2022 16:27

General

  • Target

    3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe

  • Size

    139KB

  • MD5

    a2300b70e5420a971e380a21c4469387

  • SHA1

    3fbd333c6314e91f9adf89a1b32186156c6d34bb

  • SHA256

    3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560

  • SHA512

    2fbab93c5e9c50d5a1d8a03a3e26b0d13f84cd442afe2cd35e51c900e8495fb873abd49da2e83e7df1318f5297fde44355755acc92e8f2176b1de6246c2f1a03

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\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe
    "C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1800
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tnsqxqfn\
      2⤵
        PID:960
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aelvvjtp.exe" C:\Windows\SysWOW64\tnsqxqfn\
        2⤵
          PID:1760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tnsqxqfn binPath= "C:\Windows\SysWOW64\tnsqxqfn\aelvvjtp.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.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 tnsqxqfn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2008
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tnsqxqfn
          2⤵
          • Launches sc.exe
          PID:1368
        • 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:1472
      • C:\Windows\SysWOW64\tnsqxqfn\aelvvjtp.exe
        C:\Windows\SysWOW64\tnsqxqfn\aelvvjtp.exe /d"C:\Users\Admin\AppData\Local\Temp\3b716928bfac2bcc66212be3f9ab5a072ef620edf3e4b69148e4ecf14e634560.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1900
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          PID:1016

      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\aelvvjtp.exe
        Filesize

        12.7MB

        MD5

        90be1658a0b73ad945513e33ec9db46c

        SHA1

        63590b95823de759fab94cec29adcbdebd805bdf

        SHA256

        aad3ddd372cb1ba6bab81be5ed77ce4024f3d6f006389cda9ef484aa29122daa

        SHA512

        91d65805e02303931c06c321f889fa4c27b41097aeb1d907f8c59a812d58869dad6ce81311c7fa67ba088d7743974b7a1a3b1156dee74c3c4ec959d895e6240b

      • C:\Windows\SysWOW64\tnsqxqfn\aelvvjtp.exe
        Filesize

        12.7MB

        MD5

        90be1658a0b73ad945513e33ec9db46c

        SHA1

        63590b95823de759fab94cec29adcbdebd805bdf

        SHA256

        aad3ddd372cb1ba6bab81be5ed77ce4024f3d6f006389cda9ef484aa29122daa

        SHA512

        91d65805e02303931c06c321f889fa4c27b41097aeb1d907f8c59a812d58869dad6ce81311c7fa67ba088d7743974b7a1a3b1156dee74c3c4ec959d895e6240b

      • memory/960-56-0x0000000000000000-mapping.dmp
      • memory/1016-67-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1016-75-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1016-74-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1016-73-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1016-70-0x00000000000C9A6B-mapping.dmp
      • memory/1016-69-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/1368-61-0x0000000000000000-mapping.dmp
      • memory/1472-63-0x0000000000000000-mapping.dmp
      • memory/1760-57-0x0000000000000000-mapping.dmp
      • memory/1764-59-0x0000000000000000-mapping.dmp
      • memory/1800-54-0x0000000000400000-0x0000000000425000-memory.dmp
        Filesize

        148KB

      • memory/1800-55-0x0000000075C71000-0x0000000075C73000-memory.dmp
        Filesize

        8KB

      • memory/1900-65-0x0000000000400000-0x0000000000425000-memory.dmp
        Filesize

        148KB

      • memory/2008-60-0x0000000000000000-mapping.dmp