Finding malware in Adobe Flash files (.swf) is nothing new, but it usually affects personal computers, not servers. Typically, a hidden iFrame is used to drop a binary browser exploit with .SWF files, infecting the client machine. This time we saw the opposite, where a binary .SWF file injects an invisible iFrame. This is an […]
Tag Archives: Website Malware
Spotting Malicious Injections in Otherwise Benign Code
Being able to spot suspicious code, and then determine whether it is benign or malicious is a very important skill for a security researcher. Every day we scan through megabytes of HTML, JS and PHP. It’s quite easy to miss something bad, especially when it doesn’t visually stick out and follows patterns of a legitimate […]
Popular Brazilian Site “Porta dos Fundos” Hacked
A very well known Brazilian comedy site, “Porta dos Fundos,” was recently hacked and is pushing malware (drive-by-download) via a malicious Flash executable, as you can see from our Sitecheck results: SiteCheck Found Malware on Porta dos Fundos If you do not want the joke to be on you, do not visit this site (portadosfundos) […]
Manipulating WordPress Plugin Functions to Inject Malware
Most authors of website malware usually rely on the same tricks making it easy for malware researchers to spot obfuscated code, random files that don’t belong, and malicious lines injected at the top of a file. However, it can become difficult when the malware is buried deep within the lines of code on normal files.. […]
Malvertising Payload Targets Home Routers
A few weeks ago we wrote about compromised websites being used to attack your web routers at home by changing DNS settings. In that scenario the attackers embedded iFrames to do the heavy lifting, the short fall with this method is they require a website to inject the iFrame. As is often the case, tactics […]
Website Malware – Curious .htaccess Conditional Redirect Case
I really enjoy when I see different types of conditional redirects on compromised sites. They are really hard to detect and always lead to interesting investigations. Take a look at this last one we identified: The curious aspect about it is the usage of a not so common .htaccess feature: variables. Most conditional injections rely […]
Conditional Malicious iFrame Targeting WordPress Web Sites
We have an email, [email protected] where we receive multiple questions a day about various forms of malware. One of the most common questions happen when our Free Security Scanner, SiteCheck, detects a spam injection or a hidden iframe and the user is unable to locate the infection in the source code. It’s not until we […]
