Sections such as http-stager, http-get, http-post and their corresponding uris, headers, prepend/append patterns, User-Agent are all used to distinguish between legitimate beacon's request and unrelated Internet noise or IR/AV/EDRs out of bound packets. It then parses supplied malleable profile sections to understand the contract and pass through only those inbound requests that satisfied it while misdirecting others. The RedWarden takes Malleable C2 profile and teamserver's hostname:port on its input. Sleepless nights spent on troubleshooting "why my Beacon doesn't work over CloudFlare/CDN/Domain Fronting" are over now thanks to detailed verbose HTTP(S) requests/responses logs.Can repair HTTP packets according to expected malleable contract in case some of the headers were corrupted in traffic.
Allows to define ProxyPass statemtents to pass requests matching specific URL onto other Hosts.Built-in Replay attacks mitigation enforced by logging accepted requests' MD5 hashsums into locally stored SQLite database and preventing requests previously accepted.Ability to query connecting peer's IPv4 address against IP Geolocation/whois information and confront that with predefined regular expressions to rule out peers connecting outside of trusted organizations/countries/cities etc.Grepable output log entries (in both Apache2 combined access log and custom RedWarden formats) useful to track peer connectivity events/issues.Integrated curated massive blacklist of IPv4 pools and ranges known to be associated with IT Security vendors.Ability to unfilter/repair unexpected and unwanted HTTP headers added by interim systems such as proxies and caches (think CloudFlare) in order to conform to a valid Malleable contract.Malleable C2 Profile parser able to validate inbound HTTP/S requests strictly according to malleable's contract and drop outlaying packets in case of violation (Malleable Profiles 4.0+ with variants covered).It's intended to supersede classical Apache2 + mod_rewrite setups used for that purpose. RedWarden was created to solve the problem of IR/AV/EDRs/Sandboxes evasion on the C2 redirector layer. htaccess file restrictions mandated in Apache2's mod_rewrite. This program acts as a HTTP/HTTPS reverse-proxy with several restrictions imposed upon inbound C2 HTTP requests selecting which packets to direct to the Teamserver and which to drop, similarly to the. Should any invalid inbound packet reach RedWarden - you can redirect, reset or just proxy it away! Abstract
This work combines many of those great ideas into a one, lightweight utility, mimicking Apache2 in it's roots of being a simple HTTP(S) reverse-proxy.Ĭombining Malleable C2 profiles understanding, knowledge of bad IP addresses pool and a flexibility of easily adding new inspection and misrouting logic - resulted in having a crafty repellent for IR inspections.
#Cobalt strike beacon bypass egress restrictions how to#
Red Teaming business has seen several different great ideas on how to combat incident responders and misdirect them while offering resistant C2 redirectors network at the same time. Let's raise the bar in C2 redirectors IR resiliency, shall we? (previously known as proxy2's malleable_redirector plugin) RedWarden - Flexible CobaltStrike Malleable Redirector
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