Adversaries may backdoor web servers with web shells to establish persistent access to systems. A Web shell is a Web script that is placed on an openly accessible Web server to allow an adversary to use the Web server as a gateway into a network. A Web shell may provide a set of functions to execute or a command-line interface on the system that hosts the Web server.
In addition to a server-side script, a Web shell may have a client interface program that is used to talk to the Web server (ex: China Chopper Web shell client).(Citation: Lee 2013)
View in MITRE ATT&CK®| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| action.hacking.variety.Use of backdoor or C2 | Use of Backdoor or C2 channel | related-to | T1505.003 | Server Software Component: Web Shell | |
| action.hacking.vector.Backdoor or C2 | Backdoor or command and control channel | related-to | T1505.003 | Server Software Component: Web Shell | |
| action.malware.variety.Backdoor | Backdoor (enable remote access). Child of 'RAT' when combined with 'Trojan' | related-to | T1505.003 | Server Software Component: Web Shell |