October 10, 2013 | Alberto Ortega

Yara rules for leaked KINS toolkit

Just a few days ago, the source code of the famous KINS banking trojan was leaked.KINS is a professional-grade banking trojan, destinated to infect as much computers as possible in order to steal credit cards, bank account credentials and related information from victims. Seen as a replacement to Citadel, it was identified in the wild not long ago. Now,…

October 4, 2013 | Alberto Ortega

How public tools are used by malware developers, the antivm tale

Malware authors are aware of new technologies and research made by the security community. This is palpable when they implement new vulnerability exploitation on their tools or even reuse source code that belongs to public projects.We have discussed antivm and antisandbox analysis tricks seen in malware samples several times.Not long ago we came across a malware sample that…

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October 2, 2013 | Jaime Blasco

Identifying suspicious domains using DNS records

Very often when cybercriminals are migrating to new infrastructure or when the previous has been taken down, they point their domain names (sleep) to temporary specific adresses including but not limited to:127.0.0.1 127.0.0.2 255.255.255.254 255.255.255.255 0.0.0.0 1.1.1.1Besides these, other common addresses where they point their domains are DNS servers and other infrastructure of big internet companies such as Google.We are going to describe…

September 26, 2013 | Jaime Blasco

Latest Internet Explorer 0day used against Taiwan targets

Last week, Microsoft published some details regarding a new zero-day vulnerability affecting Internet Explorer that was being used in targeted attacks against Japanese targets as Fireeye published last week.We have identified a version of the exploit hosted on a subdomain of Taiwan's Government e-Procurement System. When users visit the main webpage a Javascript code will redirect…

September 24, 2013 | Eduardo De la Arada

OSX/Leverage.a Analysis

A few days ago, a new OSX malware was detected in the wild. It looks like a picture and behaves like it when you click on it. Everything looks fine when the clicked picture is opened on the screen, but the malware also performs some other actions.After the first look, we saw that the malware copies itself to /Users…

September 17, 2013 | Jaime Blasco

Announcing a new free service: Reputation Monitor Alert

A few weeks ago we launched a new free service called Reputation Monitor Alert. The service aims to alert companies about potential compromised systems and other security problems in their infrastructure. To do this we use all the threat intelligence we gather using our IP reputation database among other external reputation sources.Once you login you just have to enter…

August 27, 2013 | Jaime Blasco

Several domains including New York Times and Twitter ones attacked by Syrian Electronic Army

During the last few hours several domains including the one from The New York Times have been redirected to a Syrian Electronic Army server. Here is the list of domains pointing to that server:Returned 39 RRs in 1.50 seconds. sokiland.fr.nf. A 141.105.64.37 sea.sy. A 141.105.64.37 m.sea.sy. A 141.105.64.37 mob.sea.sy. A 141.105.64.37 www.mob.sea.sy. A 141.105.64.37 leaks.sea…

July 1, 2013 | Jaime Blasco

Hunting for malware with undocumented instructions

A few days ago Microsoft Malware Protection Center published a great blog post about some undocumented instruction tricks being used by several malware families.As you can read in the post, they found some malware samples using FPU instructions  that lead to incorrect disassembly in several debuggers and disassemblers.I decided to write a small Python script to help us…

June 26, 2013 | Alberto Ortega

Take care of your server, or it will be hacked and sold

Have you ever had a server open to the internet with SSH service running? Then you know how common it is to receive break in attempts against your servers produced by automated bots that scan wide ranges of hosts trying weak combinations of user/password to log into remote machines.But what happens next? What is the business behind these…

June 17, 2013 | Alberto Ortega

Urausy ransomware family, a quick internals overview

Ransomware is popular among bad actors. Reveton malware family (based on Citadel) made a difference last year, now it is loosing popularity in favor of Urausy, just another lock-screen ransomware. There are a plenty of them living in the wild, but in this post we are going to focus on Urausy.These malware families are being spread by using exploit…

May 23, 2013 | Jaime Blasco

Yara rules and network detection for Operation Hangover

Last week, our friends from Norman published a great report on a cyber espionage campaign named Operation Hangover. We have released some Yara rules to detect most of the payloads mentioned on the paper. You can download the rules from our Github space:On the other hand the Hangover attackers have been using several payloads with network capabilities to steal…

May 5, 2013 | Jaime Blasco

New Internet Explorer zeroday was used in the DoL Watering Hole campaign

In our first analysis we reported that the exploited vulnerability was CVE-2012-4792 . Further analysis showed that the vulnerability exploited wasn’t CVE-2012-4792 but a new zeroday vulnerability affecting Internet Explorer 8 (CVE-2013-1347). It was confirmed by Microsoft that released a Security Advisory on Friday and also FireEye and Invincea.In addition we have…

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