- Tactics
- Persistence
- Platforms
- Linux, macOS, Network Devices, Windows
- Reference
- attack.mitre.org/techniques/T1505.003
Description
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 access 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.(Citation: volexity_0day_sophos_FW)
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 (e.g. China Chopper Web shell client).(Citation: Lee 2013)
How GTK Cyber trains on this
GTK Cyber's Threat Hunting with Data Science course teaches you to build machine-learning detections for techniques like this across the MITRE ATT&CK framework, including the Persistence tactic this technique falls under. Practitioner-led, focused on real detections, not memorizing technique IDs.
Related techniques
- T1037 — Boot or Logon Initialization Scripts
- T1053 — Scheduled Task/Job
- T1078 — Valid Accounts
- T1098 — Account Manipulation
- T1112 — Modify Registry
- T1133 — External Remote Services
- T1136 — Create Account
- T1137 — Office Application Startup
- T1176 — Software Extensions
- T1197 — BITS Jobs
- T1205 — Traffic Signaling
- T1505 — Server Software Component