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Port 9876 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
9876 tcp session director Session Director, True Image Remote Agent, Wireshark, nmap use this port.

Trojans that also use this port:
Cyber Attacker, Rux, Backdoor.Lolok

Backdoor.Lolok is a backdoor Trojan that uses the mIRC client to give a hacker access to the computer. By default, it establishes an IRC connection to on port 9876. Usualy spreads through email attachments or disguised as a video file. Discovered on 12.05.2002.

Acronis True Image Windows Agent, allows remote attackers to cause a denial of service (crash) via a malformed packet to port 9876, which triggers a NULL pointer dereference
References: [CVE-2008-1280], [BID-28169]
9876 tcp trojan [trojan] Rux Trojans
9876 tcp CyberAttacker [trojan] Cyber Attacker SANS
9876 tcp Rux [trojan] Rux SANS
9876 tcp threat Lolok Bekkoame
9876 tcp,udp A Norton Commander lookalike for UNIX. The client portion can browse files on the hard disk, in tar files, and across the network with this server component. This protocol is Sun RPC based and registers with portmapper. Bekkoame
9876 tcp sd Session Director IANA
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External Resources
SANS Internet Storm Center: port 9876

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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