Category: SANS Full Feed

This week, I noticed some new HTTP request headers that I had not seen before: X-Request-Purpose: Research and X-Hackerone-Research: plusultra X-Bugcrowd-Ninja: plusultra X-Bug-Hunter: true The purpose of these headers appears to be to identify them as being sent as part of a bug bounty. Some companies request the use of these headers as part of…

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I’ve been doing Unix/Linux IR and Forensics for a long time. I logged into a Unix system for the first time in 1983. That’s one of the reasons I love teaching FOR577[1], because I have stories that go back to before some of my students were even born that are still relevant today. In recent…

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While reviewing malicious messages that were delivered to our handler inbox over the past few days, I noticed that the “subject” of one phishing e-mail looked quite strange when displayed in the Outlook message list… As you can see, once the message was open, the subject was displayed as a normal, readable text. This suggested…

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I was intrigued when Johannes talked about malware that uses BASE64 over DNS to communicate. Take a DNS request like this: label1.label2.tld. Labels in a request like this can only be composed with letters (not case-sensitive), digits and a hyphen character (-). While BASE64 is encoded with letters (uppercase and lowercase), digits and special characters +…

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When I have a binary file to analyze, I often use tools like 010 Editor or format-bytes.py (a tool I develop). Sometimes I also use Kaitai Struct. What I did not know, is that Kaitai Struct also has a WebIDE, that allows you to parse all kinds of binary file formats in your browser. I…

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