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Malvertising is a malicious form of Internet advertising used to spread malware.
Malvertising is usually executed by hiding malicious code within relatively safe online advertisements. These ads can lead a victim to unreliable content or directly infect a victim's computer with malware, which may damage a system, access sensitive information or even control the computer through remote access.
Malvertising relies on social network advertising or user-supplied content publishing services. Malvertising may include preinstalled malicious programs set to launch through payloads at specific dates and times.
Usually, malvertising ads include active scripts that are built to download malware or force undesirable content to the victim's computer. Malvertisers primarily use Flash and Adobe to spread malware because both applications are very popular with Internet users and highly prone to security vulnerabilities.
Malvertising is immune to encryption tools like Adobe's Shockwave Flash (SWF). Malicious ads contain Flash ActionScript exploit code that corrupts SWF files. The SWFIntruder tool is an analysis kit that helps software security administrators detect malvertising. It was developed by the Open Web Application Security Project (OWASP).
Ad rotators use geotargeting technology to run preassigned malvertisements, which target users from specific countries and further complicate attack detection.
Because malvertising is included in websites and SWF files, anti-malware tools must be used to avert malvertising's harmful effects, for the following reasons: