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Port 2121 Details
known port assignments and vulnerabilities
threat/application/port search:
| Port(s) |
Protocol |
Service |
Details |
Source |
| 2121 |
tcp,udp |
scientia-ssdb |
FTP proxy uses port 2121 (TCP).
A hardcoded FTP username of myscada and password of Vikuk63 in 'myscadagate.exe' in mySCADA myPRO 7 allows remote attackers to access the FTP server on port 2121, and upload files or list directories, by entering these credentials.
References: [CVE-2018-11311], [EDB-44656]
Backdoor.Win32.Burbul.b / Anonymous Logon - backdoor Burbul.b listens on TCP port 2121 allowing anonymous logon credentials to access the infected host E.g. USER anonymous PASS anonymous.
References: [MVID-2021-0093]
Worm.Win32.Busan.k / Insecure Communication Protocol - Busan.k launches a windows cmd console on the infected host so that it can send and receive messages back and forth over TCP port 2121. The worm uses unencrypted plaintext socket communication allowing anyone who can sniff network traffic to read any communications sent or retrieved. This can disclose sensitive information to third-party well positioned attackers.
References: [MVID-2021-0185]
Backdoor.Win32.Hupigon.aejq / Port Bounce Scan - the malware listens on TCP port 2121, its FTP component accepts any username/password credentials. Third-party attackers who successfully logon can abuse the backdoor FTP server as a man-in-the-middle machine allowing PORT Command bounce scan attacks using Nmap. This vulnerability allows remote attackers to abuse your system and discreetly conduct network port scanning. Victims will then think these scans are
originating from the infected system running the afflicted malware FTP Server and not you.
References: [MVID-2021-0330]
Backdoor.Win32.Hupigon.aejq / Authentication Bypass RCE - the malware runs an FTP server on TCP port 2121. Third-party attackers who can reach infected systems can logon using any username/password combination. Intruders may then upload executables using ftp PASV, STOR commands, this can result in remote code execution.
References: [MVID-2021-0329]
Backdoor.Win32.Prorat.lkt / Weak Hardcoded Password - the ProSpy Server V1.9 malware runs an FTP component that listens on TCP port 2121. The FTP server requires authentication for remote user access. However, the username and password both use the word "special" which is both weak and hardcoded in plaintext within the executable.
References: [MVID-2021-0360]
Backdoor.Win32.Agent.Amt / Authentication Bypass - The malware can run an FTP server which listens on TCP port 2121. Third-party attackers who can reach infected systems can logon using any username/password combination. Intruders can then upload executables using ftp PASV, STOR commands, this can result in remote code execution.
References: [MVID-2024-0673]
SCIENTIA-SSDB (IANA official) |
SG
|
| 2121 |
tcp |
ccproxy-ftp |
CCProxy FTP Proxy |
Nmap
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| 2121 |
tcp,udp |
scientia-ssdb |
SCIENTIA-SSDB |
IANA
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3 records found
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External Resources
SANS ISC: port 2121
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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