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Weevely 3 Weaponized PHP Web Shell ((HOT))

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Weevely 3 Weaponized PHP Web Shell ((HOT))

A web shell is a script that can be uploaded to a web server to enable remote administration of the machine. Infected web servers can be either Internet-facing or internal to the network, where the web shell is used to pivot further to internal hosts.

A web-shell is a malicious script used by an attacker with the intent to escalate and maintain persistent access on an already compromised web application. A web-shell itself cannot attack or exploit a remote vulnerability, so it is always the second step of an attack (this stage is also referred to as post-exploitation).

An attacker can take advantage of common vulnerabilities such as SQL injection, remote file inclusion (RFI), FTP, or even use cross-site scripting (XSS) as part of a social engineering attack in order to upload the malicious script. The common functionality includes but is not limited to shell command execution, code execution, database enumeration and file management.

As we have seen, coding and using a web-shell is not difficult. Unfortunately, many web servers are setup in such a way where even a simple script is enough to cause significant damage. This is the main reason as to why there are thousands of publicly available web-shells. The fact that so many variations exist, make it difficult for intrusion detection and intrusion prevention systems (IDS/IPS) to detect them; especially if they are using signatures to detect such web shells. Some web-shells are very sophisticated and they are almost impossible to be detected, even with behavioral analysis.

Having said this, early on in this article series, we had established that web-shells are post-exploitation tools. This means that the best way to prevent exploitation, is to prevent them from being uploaded in the first place.

The main point of using backdoor shells is to persist access for as long as possible. We do this in the post exploitation phase, which focuses on identifying the value of our target as well as extending and elevating our access.

Considering that this weevely.php file is just one of thousands of files on this system, depending on how sophisticated your target is, it could be that they never find this file. You could even change this to be a filename that blends in even more. For example, there are a bunch of files in here that start with classic_, so you could name yours classic_advanced_auth.php and it would blend right in.

I am a beginner and have just started working on pentesting engagements. I have a case where I have a victim IIS server (without PHP support) where I have aspx based web shell ( -WebShell) running with "iis apppool\defaultapppool" user rights. The victim server is behind NAT. Similary our ISP does not give us a dedicated IP for a given session of Internet use and we are also behind ISP's NAT (so dynamic DNS also would not work).Since we cannot afford a static IP or a private VPN Server because of the budget , technically reverse shell is also not possible in this situation with whatever I knowledge I have and googled. So I was just thinking if there is any aspx based web shell whose url in the victim server can be used as a communication channel for a session aware shell and then finally upgrade it to a meterpreter session retaining the same url as a communication channel to integrate with the metasploit for further post exploitation excercises.

An aspx web shell (to be uploaded to the victim server) acting as a communicating channel for a session aware shell in the victim server with a static URL which can be used for having an interactive terminal session from attacker's machine and finally upgrading to meterpreter for further post exploitation (having the same static url as a communicating channel without any other port's dependancy).

I suggest you purchase a Linux Droplet on Digital Ocean instead, cost friendly. And execute a netcat, ncat command to your Droplet from the shell from the shell uploaded server. I


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