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Port 3 Details
known port assignments and vulnerabilities
threat/application/port search:
| Port(s) |
Protocol |
Service |
Details |
Source |
| 3 |
tcp,udp |
compressnet |
Delta Force uses port 3 (TCP)
Midnight Commander
SynDrop trojan
Backdoor.Win32.Quux / Weak Hardcoded Credentials - the malware listens on TCP port 3. Authentication is required, however the password "Faraon" translated from Romanian as "Pharaoh" is weak and hardcoded in cleartext within the PE file. Third-party adversaries who can reach an infected host can call commands made available by the backdoor. Commands include uploading files and code execution. Theres a need to code a custom client to communicate with the infected host as nc64.exe and telnet send LF characters and will fail authentication when sending credentials containing "\n" etc. Once connected if we send any files they will be written to Windows\System unless calling the "SetCurrDir" commmand.
References: [MVID-2022-0656]
Compression Process (IANA official) |
SG
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| 3 |
tcp,udp |
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Compression Process (official) |
Wikipedia
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| 3 |
tcp,udp |
compressnet |
Midnight Commander Sometimes this program is assigned to this port |
Bekkoame
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| 3 |
tcp,udp |
compressnet |
Compression Process |
IANA
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4 records found
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Related ports: 2 4 31 35 310 683
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External Resources
SANS ISC: port 3
Notes:
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify
a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly
used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol, the most commonly used protocol
on the Internet and any TCP/IP network. 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. Like TCP, UDP is used in combination with IP (the Internet Protocol)
and facilitates 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 and realtime gaming, 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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