In this blog post, we will look at one method that has proved to be useful to achieving this level of customization by patching Cobalt Strike’s beacon payload on target. ![]() Unfortunately, this kind of technique isn’t supported out-of-the-box on frameworks like Cobalt Strike. That way, we can be sure that everything will work and look as benign as possible before we let our agent work its magic. One effective technique is offloading the configuration of our command and control (C2) profile to the target by analysing the execution environment and checking our potential connectivity before we ever kick off a beacon. Here on the TrustedSec Adversary Emulation team, we’ve spent a lot of time coming up with ways to ensure that our first payload execution attempt has as much chance of succeeding as possible. But we can’t really afford to lose what could be our only avenue for gaining access to a target, right? Phishing is getting harder and rightly so-as an industry, we’ve spent years sending campaign after campaign, openly publishing research on how to evade that new security product with that obscure fronting technique. OK, so maybe that’s a tad specific, but you get the point. But it’s too late, a Slack message has been sent, warning everyone to be careful of opening suspicious emails… ![]() You can see from your DNS diagnostic callbacks that the beacon executed, so what gives? You quickly make a few changes to your payload and resend your phish. Then it’s time, you send in your email aaaaaand…nothing. We’ve all been there: you’ve completed your initial recon, sent in your emails to gather those leaked HTTP headers, spent an age configuring your malleable profile to be just right, set up your CDNs, and spun up your redirectors.
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