[BUSHWALK](https://attack.mitre.org/software/S1118) is a web shell written in Perl that was inserted into the legitimate querymanifest.cgi file on compromised Ivanti Connect Secure VPNs during [Cutting Edge](https://attack.mitre.org/campaigns/C0029).(Citation: Mandiant Cutting Edge Part 2 January 2024)(Citation: Mandiant Cutting Edge Part 3 February 2024)