Port 6556 Details
known port assignments and vulnerabilities
4 records found
||W32.Toxbot.C (06.30.2005) - worm that opens a backdoor on the compromised computer. Spreads by exploiting common Windows vulnerabilities. Opens and IRC backdoor on port 6556/tcp.
Also: W32.Toxbot.AL (10.09.2005).
check_mk could allow a local attacker to obtain sensitive information, caused by the creation of temporary insecure files by the check_mk_agent/job directory. A local attacker could exploit this vulnerability by creating a symbolic link from a temporary file to the service on port 6556, which could allow the attacker to gain access to files on the system and obtain sensitive information.
References: [XFDB-93520], [CVE-2014-0243], [BID-67674]
AutoSpY trojan also uses this port.
Check MK Agent also uses this port.
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SANS Internet Storm Center: port 6556
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.
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