avast! Free Antivirus for Mac was pitted against 35 other antivirus products designed for Mac OS, including plenty of pricey solutions, and came out in first place for detection of malware. Compared to Windows, Mac users have been relatively free from malware attacks. But cybercrooks are just as aware as antivirus vendors of the behavior […]
ZeroAccess ボットネットは、今なお活動中であることが広く知られているボットネットのひとつで、シマンテックが 2013 年 8 月に観測した時点では、1 日当たり 190 万台以上のコンピュータが影響されています。ZeroAccess ボットネットの大きな特徴は、P2P のコマンド & コントロール（C&C）通信アーキテクチャを使っていることです。これにより、ZeroAccess は高い可用性と冗長性を備えています。中央の C&C サーバーが存在しないため、攻撃に使われている一連のサーバーを無効化しても、それだけでボットネットを停止に追い込むことはできません。ZeroAccess に感染したコンピュータは、まず多数のピアに接続して、既知の P2P ネットワークの他のピアに関する情報を交換します。これでボットは他のピアを認識するようになり、ネットワークを通じて迅速かつ効率的に命令やファイルを拡散できるようになります。ZeroAccess ボットネットでは、ピア間で常に通信が行われています。各ピアが絶えず他のピアに接続してピアリストを交換し、ファイルの更新を確認しているので、停止の試みに対して非常に強い耐性を示します。
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The ZeroAccess botnet is one of the largest known botnets in existence today with a population upwards of 1.9 million computers, on any given day, as observed by Symantec in August 2013. A key feature of the ZeroAccess botnet is its use of a peer-to-pe…
AVAST is trusted by nearly 200 million people worldwide, and the trifecta of protection, performance, and usability work together to make it the most recommended antivirus protection in the world. If you don’t trust the experiences of 200 million people, how about research from an independent testing lab? During July and August, when the rest […]
Recently we found some new malware samples using AutoIt to hide themselves. On further analysis we found that those sample belong to the Vertexnet botnet. They use multiple layers of obfuscation; once decoded, they connect to a control server to accept commands and transfer stolen data. This sample is packed using a custom packer. On Read more…
“Sophistication” is generally viewed by most as a good thing… Dom Perignon, Kate Middleton, fresh-pressed slacks—you get the picture. Unfortunately, when it comes to sophisticated malware, you’ll find things are far from classy. And recently, researchers have discovered what they’re calling “the most sophisticated mobile Trojan to date.” They call it “Obad,” and its keepers Read more…
“Sophistication” is generally viewed by most as a good thing… Dom Perignon, Kate Middleton, fresh-pressed slacks—you get the picture. Unfortunately, when it comes to sophisticated malware, you’ll find things are far from classy. And recently, researchers have discovered what they’re calling “the most sophisticated mobile Trojan to date.” They call it “Obad,” and its keepers Read more…
Last month, I posted a blog about an increase in the use of AutoIt scripts by malware authors to carry out malicious activities. Attackers have used AutoIt scripts for a long time, and they are gaining in popularity due to their flexible and powerful nature. We have now come across another piece of malware (which Read more…
There have been over 50 million downloads of avast! Mobile Security from Google Play since it was released last year. Android users are becoming more aware of the security and theft issues surrounding their mobile devices, and putting their trust in AVAST. A few weeks ago, avast! Mobile Premium was introduced providing superior back-up and […]