SANS Institute: Commonly Probed Ports

Commonly Probed Ports
Toby Miller has provided GIAC with this list of commonly probed ports from his experience. With contributions from Rob McCauley, Meredith Lynes, Guy Bruneau and David Andrews. Please take a look at this and if you feel there should be additions send them to handler@incidents.org(last updated May 4, 2000) Also thanks goes to www.tlsecurity.net for port listings as well.

Service	Port	TCP/UDP	Explanation
Reserved	0	TCP/UDP	N/A
Sscan Signature	0 - 5	TCP	N/A
Ttymux	1	TCP	an effort to ID SGI Irix systems
echo	7	TCP/UDP	UDP Attack
systat	11	TCP	system/user information
chargen	19	TCP/UDP	potential UDP attack
ftp	20	TCP	FTP data port. Can be used in an ftp bounce attack
ftp	21	TCP	File Transfer Protocol
Ssh	22	TCP	Secure Shell
Ssh	22	TCP	PCAnywhere
PCAnywhere v. 8.x	22	UDP	N/A
Telnet	23	TCP	Remote login. Poor Authentication
SMTP	25	TCP	Simple Mail Tranfer Protocol
DNS	53	TCP	Domain Name Service. Used in zone transfers. Used for >512 byte name queries as well
DNS	53	UDP	Domain Name Service. Used for name queries
Finger	79	TCP	Can obtain computer information
Linuxconf	98	TCP	System administration tool for linux, heavily probed, attack unknown.
POP2	109	TCP	Internet Mail
POP3	110	TCP	Internet Mail
SunRpc	111 / 32771	TCP	Remote Procedure Call. Very Dangerous. Don't run unless necessary
NNTP	119	TCP	Internet News
Netbios - Name Service	137	TCP/UDP	Microsoft machines use this often
Netbios - Datagram Service	138	TCP/UDP	Microsoft machines use this often
Netbios - Session	139	TCP/UDP	Microsoft machines use this often
IMAP	143	TCP	Internet Message Access Protocol. Don't need it = Don't run it.
SNMP	161	TCP	Used for network mapping
Exec	512	TCP	Remote process execution authentication performed using passwords and login names.
Login	513	TCP	Remote login. Don't need it = Don't run it
Who	513	UDP	Shows load averages, and who's logged in. Don't need it = Don't run it
Cmd	514	TCP	Similar to Exec
Printer	515	TCP	Spooler
NCP	524	TCP	N/A
Mount	635	TCP	Mount. NFS mount service
Doly Version 1.1 & 1.2	1011	TCP	Trojan
Doly Version 1.5	1015	TCP	Trojan
Doly Version 1.6 & 1.7	1016	TCP	Trojan
Doly Version 1.35	1035	TCP	Trojan
Socks	1080	TCP	Recently has been gettign a lot of probes
NFS	2000	TCP	Network File System
Squid Proxy	3128	TCP	www.rusftpsearch.net Was searching and trying to exploit this service
ICQ	4000	UDP	Chat programs. Can be dangerous. Don't need it = Don't run it.
PCAnywhere v. 8.x & 9.x	5631	TCP	N/A
PCAnywhere v. 8.x & 9.x	5632	UDP	N/A
X-Windows	6000 +	TCP	Common exploit. Don't need it = Don't run it
Gnutella	6346	N/A	File server
IRC	6665 - 6669	TCP/UDP	Internet Relay Chat. Very dangerous. Don't need it = Don't run it
Wingate sniffers	8080	TCP	N/A
Netbus	12345-6, 20034	TCP	Remote control program. Considered by many to be a trojan.
Stacheldraht ddos	16660	TCP	ddos tool. Client -> Handler
SubSeven 2.1	27374	TCP	Trojan
Trinoo ddos	27444	UDP	ddos tool. Master -> Daemons
Trinoo ddos	27665	TCP	ddos tool. Intruder -> Master
Trinoo ddos	31335	UDP	ddos tool. Daemon -> Master
Back Orifice	31337	UDP	One of the most common Trojans
Hack 'a' Tack	31789-90	UDP	One of the most common Trojans
Unknown	32773	TCP	N/A
Traceroute	33434-33523	UDP	Common Network utility
Back Orifice 2K	54320 / 54321	UDP	One of the most common Trojans
Stacheldraht ddos	65000	TCP	ddos tool. Handler -> <- Agents
PCAnywhere v. 8.x	65301	TCP	N/A
Here is another list of ports with the known trojans or applications that run on these default ports.
Port	Trojan or application that runs on this port
21	Blade Runner, Doly Trojan, Fore, Invisible, FTP, WebEx, WinCrash
23	Tiny Telnet Server
25	Antigen, Email Password Sender, Haebu, Coceda, Shtrilitz, Stealth, Terminator, WinPC, WinSpy
25	SMTP
31	Hackers Paradise
80	Executor, WWW
110	POP3
137	Name Service (Netbios over IP) Windows
138	Datagram Service (Netbios over IP) Windows
139	Session Service (Netbios over IP) Windows
456	Hackers Paradise
555	Ini-Killer, Phase Zero, Stealth Spy
666	Satanz Backdoor
777	AIM Spy
1000	Der Spaeher3, Insane Network
1001	Silencer, WebEx, Der Spaeher3, Insane Network
1011	Doly Trojan
1029	InCommand
1050	MiniCommand 1.2
1170	Psyber Stream Server, Voice
1207	SoftWar
1234	Ultors Trojan
1243	Sub 7.2
1245	VooDoo Doll
1492	FTP99CMP
1600	Shivka-Burka
1807	SpySender
1981	Shockrave
1999	BackDoor
2000	Der Spaeher3, Insane Network
2001	Trojan Cow, Der Spaeher3, Insane Network
2023	Ripper
2115	Bugs
2140	Deep Throat, The Invasor
2716	The Prayer
2801	Phineas Phucker
3024	WinCrash
3128	Squid Proxy
3129	Masters Paradise
3150	Deep Throat, The Invasor
3700	Portal of Doom
4092	WinCrash
4590	ICQTrojan
5000	Sockets de Troie
5001	Sockets de Troie
5031	NetMetropolitan2
5032	NetMetropolitan2
5321	Firehotcker
5400	Blade Runner
5401	Blade Runner
5402	Blade Runner
5569	Robo-Hack
5636	PC Crasher
5637	PC Crasher
5742	WinCrash
6000	The Thing
6666	TCPShell.c
6669	Host Control
6670	DeepThroat
6771	DeepThroat
6883	DeltaSource
6969	GateCrasher, Priority
7000	Remote Grab
7300	NetMonitor
7301	NetMonitor
7306	NetMonitor
7307	NetMonitor
7308	NetMonitor
7789	ICKiller
8080	Proxy
9872	Portal of Doom
9873	Portal of Doom
9874	Portal of Doom
9875	Portal of Doom
9989	iNi-Killer
9999	The Prayer
10067	Portal of Doom
10167	Portal of Doom
11000	Senna Spy
11050	Host Control
11223	Progenic trojan
12223	Hack�99 KeyLogger
12345	GabanBus, NetBus
12346	GabanBus, NetBus
12361	Whack-a-mole
12362	Whack-a-mole
12701	Eclipse2000
16484	Mosucker
16969	Priority
20001	Millennium
20034	NetBus 2 Pro
20203	Chupacabra
20331	Bla
21544	GirlFriend
21554	Schwindler
22222	Prosiak
23456	Evil FTP, Ugly FTP
26274	Delta
31337	Back Orifice
31338	Back Orifice, DeepBO
31339	NetSpy DK
31666	BOWhack
33333	Prosiak
34324	BigGluck, TinyTelnetServer, TN
37651	YetAnotherTrojan
40412	The Spy
40421	Masters Paradise
40422	Masters Paradise
40423	Masters Paradise
40426	Masters Paradise
47262	Delta
50505	Sockets de Troie
50766	Fore
53001	Remote Windows Shutdown
57341	NetRaider
61466	Telecommando
65000	Devil