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The original AppCompat (solving a 20-year-old mystery for me)

13

Aug

2013

DOS v5.0, released in 1991, introduced the concept of DOS loading “high”. That is, into the high memory area – that special 64kb area at the top of the first megabyte of memory.As a result of this change, programs now loaded to a much lower address in memory than they did before. This change also exposed […]

Category General Written by Microsoft Malware Protection Center 0 Comments

Analysis of a self-debugging Sirefef cryptor

29

May

2013

Recently I wrote a blog post about a legitimate website spreading Sirefef malware. Then I continued with a deeper analysis and noticed that it uses an interesting cryptor.Malware authors spread many new variants of malware every day. These variants often look completely different at the first glance. That’s why regular updates of your antivirus is […]

Category General Written by Avast! blog 0 Comments

PHP-CGI Vulnerability Exploited in the Wild

08

May

2012

When the PHP-CGI vulnerability was disclosed, we knew it would be just a matter of days before it started to be exploited in the wild. Well, it didn’t take long. Since the weekend, we started to see scanners looking for that vulnerability on our servers and honeypots. And now we are seeing sites getting compromised […]

Category Security Written by Sucuri 0 Comments

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The original AppCompat (solving a 20-year-old mystery for me)

Analysis of a self-debugging Sirefef cryptor

PHP-CGI Vulnerability Exploited in the Wild

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