Netcat Power Tools

by Kanclirz, Jan, Jr.; Baskin, Brian; Connelly, Dan; Schearer, Michael J.; Seagren, Eric S.

ISBN13: 9781597492577

ISBN10: 1597492574

Format: Paperback

Pub. Date: 2008-06-13

Publisher(s): Elsevier Science Ltd

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Summary

Originally released in 1996, Netcat is a networking program designed to read and write data across both Transmission Control Protocol TCP and User Datagram Protocol (UDP) connections using the TCP/Internet Protocol (IP) protocol suite. Netcat is often referred to as a "Swiss Army knife" utility, and for good reason. Just like the multi-function usefulness of the venerable Swiss Army pocket knife, Netcat's functionality is helpful as both a standalone program and a back-end tool in a wide range of applications. Some of the many uses of Netcat include port scanning, transferring files, grabbing banners, port listening and redirection, and more nefariously, a backdoor. This is the only book dedicated to comprehensive coverage of the tool's many features, and by the end of this book, you'll discover how Netcat can be one of the most valuable tools in your arsenal. Book jacket.

Introduction to Netcat	p. 1
Introduction	p. 2
Installation	p. 3
Windows Installation	p. 3
Linux Installation	p. 5
Installing Netcat as a Package	p. 6
Installing Netcat from Source	p. 7
Confirming Your Installation	p. 10
Netcat's Command Options	p. 11
Modes of Operation	p. 11
Common Command Options	p. 12
Redirector Tools	p. 18
Basic Operations	p. 19
Simple Chat Interface	p. 19
Port Scanning	p. 20
Transferring Files	p. 21
Banner Grabbing	p. 23
Redirecting Ports and Traffic	p. 24
Other Uses	p. 25
Summary	p. 26
Solutions Fast Track	p. 27
Frequently Asked Questions	p. 28
Netcat Penetration Testing Features	p. 31
Introduction	p. 32
Port Scanning and Service Identification	p. 32
Using Netcat as a Port Scanner	p. 32
Banner Grabbing	p. 34
Scripting Netcat to Identify Multiple Web Server Banners	p. 35
Service Identification	p. 36
Egress Firewall Testing	p. 36
System B - The System on the Outside of the Firewall	p. 37
System A - The System on the Inside of the Firewall	p. 39
Avoiding Detection on a Windows System	p. 40
Evading the Windows XP/Windows 2003 Server Firewall	p. 40
Example	p. 41
Making Firewall Exceptions using Netsh Commands	p. 41
Determining the State of the Firewall	p. 42
Evading Antivirus Detection	p. 44
Recompiling Netcat	p. 44
Creating a Netcat Backdoor on a Windows XP or Windows 2003 Server	p. 46
Backdoor Connection Methods	p. 47
Initiating a Direct Connection to the Backdoor	p. 47
Benefit of this Method	p. 48
Drawbacks to this Method	p. 48
Initiating a Connection from the Backdoor	p. 49
Benefits of this Connection Method	p. 50
Drawback to this Method	p. 50
Backdoor Execution Methods	p. 50
Executing the Backdoor using a Registry Entry	p. 50
Benefits of this Method	p. 52
Drawback to this Method	p. 52
Executing the Backdoor using a Windows Service	p. 52
Benefits of this Method	p. 54
Drawback to this Method	p. 54
Executing the Backdoor using Windows Task Scheduler	p. 54
Benefit to this Method	p. 56
Backdoor Execution Summary	p. 56
Summary	p. 57
Solutions Fast Track	p. 57
Frequently Asked Questions	p. 59
Enumeration and Scanning with Netcat and Nmap	p. 61
Introduction	p. 62
Objectives	p. 62
Before You Start	p. 62
Why Do This?	p. 63
Approach	p. 64
Scanning	p. 64
Enumeration	p. 65
Notes and Documentation	p. 66
Active versus Passive	p. 67
Moving On	p. 67
Core Technology	p. 67
How Scanning Works	p. 67
Port Scanning	p. 68
Going behind the Scenes with Enumeration	p. 71
Service Identification	p. 71
RPC Enumeration	p. 72
Fingerprinting	p. 72
Being Loud, Quiet, and All That Lies Between	p. 73
Timing	p. 73
Bandwidth Issues	p. 74
Unusual Packet Formation	p. 74
Open Source Tools	p. 74
Scanning	p. 75
Nmap	p. 75
Nmap: Ping Sweep	p. 75
Nmap: ICMP Options	p. 76
Nmap: Output Options	p. 77
Nmap: Stealth Scanning	p. 77
Nmap: OS Fingerprinting	p. 78
Nmap: Scripting	p. 79
Nmap: Speed Options	p. 80
Netenum: Ping Sweep	p. 83
Unicornscan: Port Scan and Fuzzing	p. 83
Scanrand: Port Scan	p. 84
Enumeration	p. 85
Nmap: Banner Grabbing	p. 85
Netcat	p. 87
P0f: Passive OS Fingerprinting	p. 88
Xprobe2: OS Fingerprinting	p. 88
Httprint	p. 89
Ike-scan: VPN Assessment	p. 91
Amap: Application Version Detection	p. 92
Windows Enumeration: Smbgetserverinfo/smbdumpusers/smbclient	p. 92
Banner Grabbing with Netcat	p. 97
Introduction	p. 98
Benefits of Banner Grabbing	p. 98
Benefits for the Server Owner	p. 99
Finding Unauthorized Servers	p. 99
Benefits for a Network Attacker	p. 101
Why Not Nmap?	p. 103
Basic Banner Grabbing	p. 104
Web Servers (HTTP)	p. 104
Acquiring Just the Header	p. 106
Dealing With Obfuscated Banners	p. 107
Apache ServerTokens	p. 109
Reading the Subtle Clues in an Obfuscated Header	p. 110
HTTP 1.0 vs. HTTP 1.1	p. 110
Secure HTTP servers (HTTPs)	p. 112
File Transfer Protocol (FTP) Servers	p. 116
Immense FTP Payloads	p. 118
E-mail Servers	p. 120
Post Office Protocol (POP) Servers	p. 120
Simple Mail Transport Protocol (SMTP) Servers	p. 121
So, Back to the Banner Grabbing	p. 122
Fingerprinting SMTP Server Responses	p. 124
How to Modify your E-mail Banners	p. 125
Sendmail Banners	p. 126
Microsoft Exchange SMTP Banners	p. 128
Microsoft Exchange POP and IMAP Banners	p. 129
Secure Shell (SSH) Servers	p. 130
Hiding the SSH Banner	p. 132
Banner Grabbing with a Packet Sniffer	p. 132
Summary	p. 137
Solutions Fast Track	p. 139
Frequently Asked Questions	p. 141
The Dark Side of Netcat	p. 143
Introduction	p. 144
Sniffing Traffic within a System	p. 145
Sniffing Traffic by Relocating a Service	p. 146
Sniffing Traffic without Relocating a Service	p. 151
Rogue Tunnel Attacks	p. 156
Connecting Through a Pivot System	p. 160
Transferring Files	p. 165
Using Secure Shell	p. 165
Using Redirection	p. 166
Man-in-the-middle Attacks	p. 167
Backdoors and Shell Shoveling	p. 168
Backdoors	p. 168
Shell Shoveling	p. 170
Shoveling with No Direct Connection to Target	p. 170
Shoveling with Direct Connection to Target	p. 173
Netcat on Windows	p. 174
Summary	p. 176
Transferring Files Using Netcat	p. 179
Introduction	p. 180
When to Use Netcat to Transfer Files	p. 180
Sometimes Less Really is Less	p. 181
Security Concerns	p. 181
Software Installation on Windows Clients	p. 182
Where Netcat Shines	p. 182
Speed of Deployment	p. 183
Stealth	p. 183
Small Footprint	p. 184
Simple Operation	p. 184
Performing Basic File Transfers	p. 185
Transferring Files with the Original Netcat	p. 185
Closing Netcat When the Transfer is Completed	p. 186
Other Options and Considerations	p. 187
Timing Transfers, Throughput, etc.	p. 188
Tunneling a Transfer Through an Intermediary	p. 189
Using Netcat Variants	p. 190
Cryptcat	p. 190
GNU Netcat	p. 192
SBD	p. 193
Socat	p. 194
Socat Basics	p. 194
Transferring Files with Socat	p. 195
Encryption	p. 196
Mixing and Matching	p. 197
Ensuring File Confidentiality	p. 198
Using OpenSSH	p. 198
Installing and Configuring Secure Shell	p. 199
Configuring OpenSSH Port Forwarding	p. 201
Using SSL	p. 202
Configuring Stunnel	p. 202
Using IPsec	p. 205
Configuring IPSec on Windows	p. 206
Configuring IPSec on Linux	p. 212
Ensuring File Integrity	p. 217
Hashing Tools	p. 217
Using Netcat for Testing	p. 219
Testing Bandwidth	p. 219
Testing Connectivity	p. 220
Summary	p. 221
Solutions Fast Track	p. 221
Frequently Asked Questions	p. 223
Troubleshooting with Netcat	p. 225
Introduction	p. 226
Scanning a System	p. 227
Testing Network Latency	p. 230
Using Netcat as a Listener on Our Target System	p. 231
Using a Pre-existing Service on Our Target System	p. 234
Using a UDP Service	p. 234
Using a TCP Service	p. 235
Application Connectivity	p. 236
Troubleshooting HTTP	p. 237
Troubleshooting FTP	p. 243
Troubleshooting Active FTP Transfers Using Netcat	p. 245
Troubleshooting Passive FTP Transfers using Netcat	p. 248
Summary	p. 251
Index	p. 253
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Netcat Power Tools

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