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[{"id":483,"title":"Self-taught through trial and error","votes":547,"type":"x","order":1,"pct":78.48,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.3,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.88,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.34,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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74

Bagle Worm Overview: Evading Gateway Endpoints Using Zip Encryption

It is important to stress that the problem with infected password protected zip files is only manifest with gateway scanners. On client computers with up-to-date AV protection, the worm is detected once the user provides the password and decompresses/decrypts the zip file. This fact provides a graphic example why it is important to implement defense in-depth on all layers of your IT infrastructure. . . .. Although by now most vendors have implemented some kind of patch to combat the most recent variant of the Bagle worm, fact remains this malware managed to defeat a large number of vendors' gateway AV scanners. The culprit? A password protected zip file that carries the Bagle worm. According to antivirus vendors, this particular strain (Bagle.J, or .H or .K, depending on vendor) appeared in the wild on March 2nd. Besides the password protected zip "feature", it is in no way special as it uses well known techniques to spread via SMTP. However, only hours after it's been found in the wild, customers at many large enterprise sites began to notice Bagle carrying zip files slipping through their gateway defenses. Of course, the AV vendors had probably a hard time explaining why this was happening to an increasingly nervous IT personnel. To an antivirus scan engine password protection is in essence, encryption. The purpose of encrypting is to avoid prying eyes, including those of technology. And AV technology must have the key, that is password, to decompress the zip archive and scan it. No password, no scanning - simple as that. The idea is so simple and straightforward that it's really surprising it hasn't been exploited more often up until now. The link for this article located at net-security.org is no longer available. . Encrypted archives can evade antivirus detection, underscoring the necessity for multi-faceted security strategies in technology networks.. Malware Detection,Bagle Worm,Zip File Security,Antivirus Measures. . Anthony Pell

Calendar 2 Mar 04, 2004 User Avatar Anthony Pell Network Security
74

Mydoom Worm Threat: Email Tips for Securing Zip File Risks

E-mail users who were slow to update their antivirus software last week may have been surprised to receive a flood of e-mail messages containing .zip files from long-lost acquaintances, business partners and complete strangers. The e-mail was sent by the recent Mydoom e-mail worm. The zipped attachments were evidence of what antivirus experts say is a new trend in virus-writing circles: using compressed files to hide viruses and elude detection by antivirus engines. . . .. E-mail users who were slow to update their antivirus software last week may have been surprised to receive a flood of e-mail messages containing .zip files from long-lost acquaintances, business partners and complete strangers. The e-mail was sent by the recent Mydoom e-mail worm. The zipped attachments were evidence of what antivirus experts say is a new trend in virus-writing circles: using compressed files to hide viruses and elude detection by antivirus engines. Such files are containers for one or more compact files. Using programs such as WinZip for Windows or Unzip for Unix, users compressed files they want to store or transfer to others. The files must then be decompressed, or "unzipped," before they can be viewed. Long a staple of Internet and office communications, the .zip file has become embroiled in an arms race between virus writers and antivirus technology companies, experts said. "We're definitely seeing a trend," said Alex Shipp, an antivirus technology expert at MessageLabs Ltd. "It really took off in 2003. As soon as one virus was successful with technology like this, other virus writers took notice." Virus authors learned long ago to hide their creations in e-mail file attachments, often disguising viruses as Windows screen saver (.scr) files or Windows program information (.pif) files, said Mike Hrabik, chief technology officer at Solutionary Inc., a managed security services company in Omaha. While .zip files were occasionally used to mask virus payloads, the practice wasn't common in virus-writing circles because .zipfiles, unlike .scr and .pif files, required separate software to be installed on the receiving system before the files can be opened and run, he said. All that changed with the release of Microsoft Corp.'s Windows XP operating system, which included native support for opening .zip files. According to Gerhard Eschelbeck, CTO of security vulnerability scanning company Qualys Inc., embedded support for .zip files in modern systems makes them easy targets for worms like Mydoom. The link for this article located at computerworld.com is no longer available. . Unforeseen patterns in malware hiding through .zip archives are transforming the landscape of email protection.. Email Security, Malware Detection, Zip File Threats. . Anthony Pell

Calendar 2 Feb 09, 2004 User Avatar Anthony Pell Network Security
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[{"id":483,"title":"Self-taught through trial and error","votes":547,"type":"x","order":1,"pct":78.48,"resources":[]},{"id":484,"title":"Formal training or courses","votes":30,"type":"x","order":2,"pct":4.3,"resources":[]},{"id":485,"title":"A job that required it","votes":34,"type":"x","order":3,"pct":4.88,"resources":[]},{"id":486,"title":"Other","votes":86,"type":"x","order":4,"pct":12.34,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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