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this may raise more alarms among the system users, but there are few other options besides grabbing the various log files from \winnt\system32 and altering them manually, a hit-or-miss proposition because of the complex NT log syntax The elsave utility from Jesper Lauritsen (http://wwwibtkudk/jesper/NTtools/) is a simple tool for clearing the event log For example, the following syntax using elsave will clear the Security Log on the remote server joel (correct privileges are required on the remote system):
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C:\> elsave -s \\joel -l "Security" -C
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Keeping a toolkit on the target system for later use is a great timesaver for malicious hackers However, these little utility collections can also be calling cards that alert wary system admins to the presence of an intruder Thus, steps will be taken to hide the various files necessary to launch the next attack
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attrib
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Hiding files gets no simpler than copying files to a directory and using the old DOS attrib tool to hide it, as shown with the following syntax:
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attrib +h [directory]
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This hides files and directories from command-line tools, but not if the Show All Files option is selected in Windows Explorer
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If the target system runs the Windows NT File System (NTFS), an alternate file hiding technique is available to intruders NTFS offers support for multiple streams of information within a file The streaming feature of NTFS is touted by Microsoft as a mechanism to add additional attributes or information to a file without restructuring the file system for example, when NT s Macintosh file compatibility features are enabled It can also be used to hide a malicious hacker s toolkit call it an adminkit in streams behind files The following example will stream netcatexe behind a generic file found in the winnt\system32\os2 directory so that it can be used in subsequent attacks on other remote systems This file was selected for its relative obscurity, but any file could be used To stream files, an attacker will need the POSIX utility cp from NTRK The syntax is simple, using a colon in the destination file to specify the stream
cp <file> oso001009:<file>
For example:
cp ncexe oso001009:ncexe
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This hides ncexe in the ncexe stream of oso001009 To unstream netcat
cp oso001009:ncexe ncexe
The modification date on oso001009 changes but not its size (some versions of cp may not alter the file date) Thus, hidden streamed files are very hard to detect Deleting a streamed file involves copying the front file to a FAT partition, then copying it back to NTFS Streamed files can still be executed while hiding behind their front Due to cmdexe limitations, streamed files cannot be executed directly (that is, oso001009:ncexe) Instead, try using the START command to execute the file:
start oso001009:ncexe
Finding Streams U Countermeasure: for ferreting out NTFS file streams is March Information Systems The only reliable tool
Streamfinder March was acquired by Internet Security Systems (ISS), who apparently no longer make the utility available on its European web site A copy can be obtained from http://wwwhackingexposedcom JD Glaser s sfind is also a great stream-finding tool (see http://wwwntobjectivescom)
SUMMARY
We have covered a tremendous range of possible attacks on Windows NT in this chapter, so many that most readers may be wondering aloud about the inherent security of the OS If so, then we haven t done our jobs let us reemphasize that little can be done remotely without the Administrator privilege, and that there are few ways to obtain this privilege other than the usual routes: guessing the password, eavesdropping on password exchanges, or social engineering it from gullible personnel Thus, our summary will be mercifully short after this long read If the following simple steps are taken, 9999 percent of Windows NT security problems just vanish Keep in mind, though, that the other 001 percent of problems probably haven t been thought up yet M Block access to TCP and UDP ports 135 139 This single step will prevent almost every remote NT problem we ve outlined in this book It should definitely be done at the perimeter security gateway for all networks and should be considered for internal access devices as well Individual hosts can have NetBIOS disabled on sensitive interfaces Scan your networks regularly for stragglers If you are running TCP/IP on NT, configure TCP/IP Filtering under Control Panel | Network | Protocols | TCP/IP | Advanced | Enable Security |
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