Menu
Data-stealing malware pretends to be Microsoft IIS server module

Data-stealing malware pretends to be Microsoft IIS server module

Most antivirus products aren't detecting the malware, called "INS"

Trustwave's SpiderLabs researchers have found a piece of malware that collects data entered into Web-based forms, pretending to be a module for Microsoft's Internet Information Services (IIS) web-hosting software.

The malware, which is dubbed "ISN," hasn't been widely seen, but its characteristics are interesting, wrote Josh Grunzweig, a Trustwave malware researcher, on a company blog.

ISN is a malicious DLL (dynamic link library), which is installed as a module for IIS, Grunzweig wrote. ISN's installer contains four versions of the DLL, one of which is served up depending on whether a victim uses the 32- or 64-bit version of IIS6 or IIS7+.

"This module is of particular concern as it is currently undetectable by almost all anti-virus products," Grunzweig wrote.

If ISN's installer is detected, it's usually through "general heuristic detection," Grunzweig wrote, which means security software is looking at aspects of it that are suspicious and flagging it, such as if it is sending data to another server.

"I'm using this post as a way of notifying anti-virus vendors so that specific detections for this malware may be written," he wrote, adding that he thinks the malware is "pretty neat."

ISN collects data from POST requests, Grunzweig wrote. The stolen information is lifted from within IIS itself, which circumvents encryption, and then sent elsewhere. The malicious module can be configured to monitor information from specific URIs (uniform resource identifier), he wrote.

The malware has so far been "seen targeting credit card data on e-commerce sites, however, it could also be used to steal logins, or any other sensitive information sent to a compromised IIS instance," he wrote.

"Overall, this malware does not appear to be widely spread and has only been seen in a few forensic case instances," Grunzweig wrote. "However, the extremely low detection rate in collaboration with the malware's targeted functionality makes this a very real threat."

Send news tips and comments to jeremy_kirk@idg.com. Follow me on Twitter: @jeremy_kirk


Follow Us

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags securitymalwaretrustwaveExploits / vulnerabilities

Featured

Slideshows

Meet the leading female front runners of the Kiwi channel

Meet the leading female front runners of the Kiwi channel

Reseller News honoured the leading female front runners of the New Zealand channel at the 2018 Women in ICT Awards (WIICTA) in Auckland. The awards honoured standout individuals across seven categories, spanning Entrepreneur; Innovation; Rising Star; Shining Star; Community; Technical and Achievement.

Meet the leading female front runners of the Kiwi channel
Meet the top performing customer-centric Microsoft channel partners

Meet the top performing customer-centric Microsoft channel partners

Microsoft honoured leading partners across the channel following a year of customer innovation and market growth in New Zealand. The 2018 Microsoft Partner Awards recognised excellence within the context of the end-user, spanning a host of emerging and established providers.

Meet the top performing customer-centric Microsoft channel partners
Reseller News launches new-look Awards at 2018 Judges’ Lunch

Reseller News launches new-look Awards at 2018 Judges’ Lunch

Introducing the Reseller News Innovation Awards, launched to the channel at the 2018 Judges’ Lunch in Auckland. With more than 70 judges now part of the voting panel, the new-look awards will reflect the changing dynamics of the channel, recognising excellence across customer value and innovation - spanning start-ups, partners, distributors and vendors.

Reseller News launches new-look Awards at 2018 Judges’ Lunch
Show Comments