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Port 2004 Details
known port assignments and vulnerabilities
threat/application/port search:
| Port(s) |
Protocol |
Service |
Details |
Source |
| 2004 |
tcp |
trojans |
Duddie, TransScout
Backdoor.Win32.NinjaSpy.c / Remote Command Execution - the malware listens on TCP ports 2003, 2004 and drops a DLL named "cmd.dll" under Windows dir. Connecting to port 2003, you will get back a number "9951" from the infected host. If we send the value 1000 we get a message in Portugese "Pisca Pisca Ativado" translates to "Blink Blink Activated". If we connect to port 2004 and send "abc123" we get message "Acesso negado..." translates to "Access denied". However, if you take the initial number we received earlier (9951) when connecting to port 2003 and apply some calculation we expose hidden functionality. Take the 9951 value and invert the first two digits to 66 and then add together the last two 5 + 1 to equal 6 for a final value of "666". Example, initial number (9951) 99 inverted equals 66 and 5 + 1 = 6. Enter and send the constructed value of "666" to port 2003 and TCP port 999 is opened. Connect to port 999 and you get back a remote shell.
References: [MVID-2021-0202] |
SG
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| 2004 |
tcp |
trojan |
Duddie |
Trojans
|
| 2004 |
tcp |
TransScout |
[trojan] TransScout |
SANS
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| 2004 |
tcp |
mailbox |
mailbox |
Nmap
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| 2004 |
udp |
eDonkey2000 |
eDonkey2000 unknown/unlisted port |
Neophasis
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| 2004 |
tcp,udp |
threat |
OICQSer |
Bekkoame
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| 2004 |
udp |
emce |
CCWS mm conf |
IANA
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7 records found
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jump to:
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Related ports: 2002 2003 2005
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External Resources
SANS ISC: port 2004
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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