新闻来源:solidot
在Flame恶意程序上周曝光之后,幕后攻击者立即关闭了80多个命令控制服务器。服务器域名是采用化名注册,每个化名最多注册4个域名。上传到服务器的数据包括了计算机辅助软件绘制图纸、电子邮件和PDF文档。域名最早注册时间是在2008年,使用至少22个不同IP地址,服务器运行Ubuntu Linux发行版。卡巴斯基与GoDaddy和OpenDNS合作,将域名重定向到其控制的服务器上,收集到了恶意程序上传的数据。

安全研究人员发现,Flame和Duqu有许多共同特征,都对受感染机器上的AutoCAD绘图文件感兴趣。为了限制窃取的文件数量和避免上传无关的文件,Flame会从PDF、电子表格和Word文档中提取1KB样本,压缩和上传样本到命令控制服务器,然后攻击者发出指令抓取他们感兴趣的特定文档。




与Duqu不同之处是,Duqu会利用SSH端口转发伪装攻击者的真实身份,而Flame则是直接上传到服务器,换句话说,它的幕后攻击者没有Duqu的操作者谨慎。
|
Duqu | Flame |
Server OS | CentOS Linux | Ubuntu Linux |
Control scripts | Running on remote server, shielded through SSH port forwarding | Running on servers |
Number of victims per server | 2-3 | 50+ |
Encryption of connections to server | SSL + proprietary AES-based encryption | SSL |
Compression of connections | No | Yes, Zlib and modified PPMD |
Number of known C&C’s domains | n/a | 80+ |
Number of known C&C IPs | 5 | 15+ |
Number of proxies used to hide identity | 10+ | Unknown |
Time zone of C&C operator | GMT+2 / GMT+3 | Unknown |
Infrastructure programming | .NET | Unknown |
Locations of servers | India, Vietnam, Belgium, UK, Netherlands, Switzerland, Korea, etc... | Germany, Netherlands, UK, Switzerland, Hong Kong, Turkey, etc... |
Number of built-in C&C IPs/domain in malware | 1 | 5, can update list |
SSL certificate | self-signed | self-signed |
Servers status | Most likely hacked | Most likely bought |
SSH connections | no | yes |