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Ssh Rd Rev Jar
once a compromise has been discovered, there are more approaches to mitigating it. a proper mitigation plan typically includes: first establishing a handle on the location of the affected host(s), whether they’re web servers, file shares, printers, etc.; secondly, deciding which workloads and systems are affected by the compromise; thirdly, deciding where the data is being written to, and creating a plan for how to clean it; and finally, deciding what happens to the affected host(s) once the incident has been resolved.
according to our analysis, the attacks appear to be executed via ssh so this would indicate that the password, and possibly other credentials, were obtained via a phishing email campaign. one attack was a successful phishing attempt against one of the targeted companies to obtain an account username and password. the compromised credentials were then used to execute a lesser-known password cracking tool, known as crimson hex , against a windows system, here . the admin credentials that were obtained were most likely used to access the internal corporate network to execute the lzj which was later used to copy files to a different server. we believe the attacker used this second server to further propagate the threat and to support the exit portal. it is believed that this malicious server is the one that had the webshells as well as the credentials to login to the targeted systems. this particular webshell also contained a dropper, or first-stage dropper, from windows.
we have seen a lot of documentation from enterprising hackers and researchers who use tools available to test web servers to execute these commands. the benefit of using web-based technologies like these is that they make it easy to execute these commands from outside of a network, and they have many libraries available to make that easier to accomplish. tools like these are specifically designed to find weaknesses in web applications that allow access to the underlying file system and its contents. within a network, and especially inside an enterprise, due to organizational boundaries and the fact that every system is different, the ability to execute commands or create files is much more difficult.
this script was found with the same file we previously observed, but instead of giving the actor direct access to the webserver, it caused the actor to be part of a legitimate user on the server and was able to execute arbitrary code as the user.
this variant of the webshell is similar to the script included in the proof of concept, but there are some differences. the last three lines of the script show the string of characters the webshell expects as input for the command and the name of the parameter to use to send the string to the webserver. the first difference is the script expects an input string that is prefixed by the string “cmd2” instead of “cmd”. the script also changes the webshell’s user name to jenkins in order to hide the script’s activity.
the webshell hashes are below. both files are saved as /mnt/var/cache/www/wordpress/update.php.bz2 for the poc and /mnt/var/cache/www/wordpress/update.tar.gz for the live exploit. you can download either file and run it to get to the webshell.
if you aren’t quite sure why there’s a file named /home/jenkins/slave.jar there, you can check what files and directories are owned by the user who has the current effective user and group id. the effective user id is the uid of the user that you’re currently using.
the third script is used to upload a base64 encoded file to the server and then immediately extract the base64 encoded file from virustotal and then upload it to the server. the fourth script is used to upload a base64 encoded file to the server. after the file has been uploaded, the file is extracted from virustotal and then uploaded to the server.
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