Overview

overview

10

Static

static

n6osajjc938.exe

windows7_x64

10

n6osajjc938.exe

windows10_x64

10

Analysis

  • max time kernel
    149s
  • max time network
    49s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    24/04/2021, 09:03

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General

  • Target
    n6osajjc938.exe
  • Size 241KB
  • Sample210424-bcsbneszvx
  • SHA256 a8fd30b03500b24c3f28f24919bbad05355c837271fb4c49f6fc495afe11b9b1
  • MD5 SHA1 SHA512
Score
10/10
tofseeevasionpersistencetrojan

Malware Config

Signatures

  • Tofsee

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

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

    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 3 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\n6osajjc938.exe
    "C:\Users\Admin\AppData\Local\Temp\n6osajjc938.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1652
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ohmweukk\
      2⤵
        PID:1564
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ffgrmnlt.exe" C:\Windows\SysWOW64\ohmweukk\
        2⤵
          PID:1588
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ohmweukk binPath= "C:\Windows\SysWOW64\ohmweukk\ffgrmnlt.exe /d\"C:\Users\Admin\AppData\Local\Temp\n6osajjc938.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:700
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description ohmweukk "wifi internet conection"
            2⤵
              PID:1476
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start ohmweukk
              2⤵
                PID:652
              • 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:1012
              • C:\Windows\SysWOW64\ohmweukk\ffgrmnlt.exe
                C:\Windows\SysWOW64\ohmweukk\ffgrmnlt.exe /d"C:\Users\Admin\AppData\Local\Temp\n6osajjc938.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:1624
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Modifies data under HKEY_USERS
                  PID:1160

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/1160-72-0x0000000000080000-0x0000000000095000-memory.dmp
                    Download

                    memory/1624-77-0x0000000000400000-0x0000000002BAD000-memory.dmp
                    Download

                    memory/1652-63-0x0000000000400000-0x0000000002BAD000-memory.dmp
                    Download

                    memory/1652-60-0x0000000000220000-0x0000000000233000-memory.dmp
                    Download

                    memory/1652-61-0x00000000754F1000-0x00000000754F3000-memory.dmp
                    Download