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reversing

Windows Anti-Debug techniques - OpenProcess filtering

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This week I took a break from SYSTEM chasing to review some anti-debugging techniques. With quite a few Bug Bounty programs available relying on client-side applications, I thought I'd share one of the techniques used by numerous security products (and apparently game anti-cheat engines) to stop you from debugging core components, and just how we can go about bypassing this. Obviously it goes without saying, but the technique shown in this post is not a vulnerability, if an attacker has this level of access to your system... it was already game over and they are likely just finishing up by ins…

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ExplodingCan - A vulnerability review

A few months ago, my colleagues over at Secarma released a review of ExplodingCan, one of the many exploits released as part of the ShadowBrokers dump. At the time I was asked to complete a review of the vulnerability, specifically how this affected a vulnerable server and if anything could be done to protect users. My analysis of the vulnerability can now be found over at Secarma Labs: https://www.secarma.co.uk/labs/explodingcan-a-vulnerability-review/ Enjoy :)…

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Analysis of APT28 hospitality malware (Part 2)

In the first part of this malware review, we looked at the VBA code used by APT28 to drop a DLL onto the victims' machine as part of their recently highlighted hospitality campaign. In this post, we will look at the dropped file, and understand just what it does, and how we can analyse it using IDA Pro. So we know from the first post that we have a DLL, which is run using the following command: rundll32.exe %APPDATA%\user.dat,#1 Loading the extracted DLL into IDA, the first thing that we notice is that we have an exported function of load with an ordinal of 1: We know from the rundll32.exe com…

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Analysis of APT28 hospitality malware

This week, FireEye published a writeup of yet another APT28 campaign, this time targeting the hospitality sector: Exposing Russian hackers #APT28 and their targeting of hotels & travelers. Also first targeted use of ETERNALBLUE.https://t.co/iiHh71UQeF pic.twitter.com/SIMeDd7MTM— Nick Carr (@ItsReallyNick) August 11, 2017 I'm always interested to see the latest APT group techniques, so I decided to review the malware to see how the dropper worked (and see if there were any goodies I could add to my toolkit). The dropper was shown to be a typical Word .docm file (MD5: 9b10685b774a783ea…

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