Category: Blog

Malvertising: Not all Java from java.com is legitimate

Isn't it ironic getting a Java exploit via java.com, the primary source for one of the most common used browser plugins? Current malvertising campaigns are able to do this. This blog post details a relatively new trend: real-time advertisement bidding platforms being infiltrated by cyber criminals spreading malware.   Conclusion Malvertising has changed over the years starting … Continue reading Malvertising: Not all Java from java.com is legitimate →

CryptoLocker ransomware intelligence report

In the beginning of September 2013, the CryptoLocker malware variant appeared in the wild, spread exclusively by the infamous P2P ZeuS (aka Gameover ZeuS) malware. CryptoLocker had a simple purpose: to act as ransomware, encrypting important files such as images and documents, and then asking the victim for money to unlock the files. Image source: … Continue reading CryptoLocker ransomware intelligence report →

OpenSSL ‘heartbleed’ bug live blog

A bug has been identified in OpenSSL, all details can be found at heartbleed.com. The bug has been assigned CVE-2014-0160. OpenSSL versions 1.0.1 – 1.0.1f are vulnerable. We advise to upgrade OpenSSL to version 1.0.1g or higher Test if you are vulnerable You can test if you are vulnerable by requesting a heartbeat response with … Continue reading OpenSSL ‘heartbleed’ bug live blog →

Building Bowser – A password cracking story

At Fox-IT we perform a lot of penetration tests. Invariably we encounter hashed versions of passwords that need to be tested for strength. We suspected that with a relatively small investment most passwords could be cracked, regardless of their complexity. It turns out this is true for any password of 8 characters or less.  This … Continue reading Building Bowser – A password cracking story →

Malicious advertisements served via Yahoo

Detection of the infection Fox-IT operates the shared Security Operations Center service ProtACT. This service monitors the networks of our clients for malicious activity. On January 3 we detected and investigated the infection of clients after they visited yahoo.com. Infection Clients visiting yahoo.com received advertisements served by ads.yahoo.com. Some of the advertisements are malicious. Those … Continue reading Malicious advertisements served via Yahoo →

Not quite the average exploit kit: Zuponcic

A couple of weeks ago at the FOX-IT SOC, we noticed Zuponcic attempting to infect one of our clients protected networks. The incident was caused by a person visiting the website of Suriname's Ministry of Finance, minfin.sr. This post connects three recent developments in the realm of malware infections: .htaccess server compromise, the Zuponcic exploit … Continue reading Not quite the average exploit kit: Zuponcic →

Large botnet cause of recent Tor network overload

Recently, Roger Dingledine described a sudden increase in Tor users on the Tor Talk mailinglist. To date there has been a large amount of speculation as to why this may have happened. A large number of articles seem to suggest this to be the result of the recent global espionage events, the evasion of the … Continue reading Large botnet cause of recent Tor network overload →

Analysis of malicious advertisements on telegraaf.nl

Starting on Wed, 31 July 2013, 18:54:50 Fox-IT's monitoring system detected a redirect occurring on telegraaf.nl. It was another case of advertisement provider abuse. One of the advertisement providers loaded ads from an outside resource which returned an exploit kit named "FlimKit" exploit kit. After first being removed from telegraaf.nl a second exploit kit redirect … Continue reading Analysis of malicious advertisements on telegraaf.nl →