Port 3333 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
3333 tcp trojans W32.Bratle.A [Symantec-2005-073116-3607-99] (2005.07.31) - worm that exploits the MS Windows LSASS Buffer Overrun vulnerability ([MS04-011]). Opens a FTP server on port 3333/tcp.

Backdoor.Slao [Symantec-2003-052610-2111-99] (2003.05.26) - a backdoor trojan horse that allows unauthorized access to an infected computer.

Daodan trojan also uses this port.

ATC Rainbow Six Lockdown (TCP/UDP), developer: Foolish Entertainment
3333 udp dec-notes Wireshark (formerly Ethereal) is vulnerable to a buffer overflow, caused by improper bounds checking by the dissect_enttec_dmx_data() function when processing DMX data within ENTTEC packets. By sending a specially-crafted packet to UDP port 3333, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.
References: [CVE-2010-4538], [XFDB-64450], [BID-45634], [EDB-15898]

Horos could allow a remote attacker to traverse directories on the system, caused by the failure to restrict unwanted access. An attacker could send a specially-crafted URL request to the port 3333 containing "dot dot dot" sequences (/.../) in the URL to view arbitrary files on the system.
References: [XFDB-119862]

IANA registered for: DEC Notes (TCP/UDP)
3333 tcp Network Caller ID server (unofficial) Wikipedia
3333 tcp,udp trojan Daodan Trojans
3333 tcp,udp applications ATC Battlefield 2 Portforward
3333 tcp,udp applications ATC Rainbow Six Lockdown Portforward
3333 tcp,udp threat W32.Bratle Bekkoame
3333 tcp,udp threat W32.Zotob Bekkoame
3333 tcp,udp dec-notes DEC Notes IANA
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Related ports: 3030  3131  3232  3434  

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External Resources
SANS Internet Storm Center: port 3333

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

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