Origins Tracing™ against Android.SmsSend
22 August 2011
The conventional detection technique requires a unique signature for each malicious file, so an anti-virus can recognize such a file. Consequently, the size of a database containing such signatures increases when new entries are added. Meanwhile, to avoid detection virus makers often recompile malicious files or alter the source code insignificantly. So the malicious payload remains the same but the signature of such a malicious program will differ from the one present in the virus database and an anti-virus may fail to detect such malware.
Origins Tracing™ from Doctor Web works differently. A special file describing the behaviour pattern is created for each malicious program added into the database. One such an entry is enough for an entire family of malicious applications to be recognized by the anti-virus, which ensures prompt detection of new variants of one program and significantly reduces the size of virus databases.
Origins Tracing™ is a unique technology created by Doctor Web. It has been used in Dr.Web products for desktops for several years and has recently been incorporated into the new versions of Dr.Web for Android Anti-virus&Anti-spam and Dr.Web for Android Light. Yet with Origins Tracing™ these software products successfully neutralize Android.SmsSend Trojan horses. This type of malignant software offers users to send paid SMS to install free applications, such as the browser Opera Mini. Once this Trojan horse has been added as Android.SmsSend.47 into the Origins Tracing™ databases, virus writers have tried repeatedly to change the source code of the program, hoping to bypass the anti-virus defence, but it has not brought any results. Each new version is successfully detected by the anti-virus software automatically. It should be noted that in the near future the list of malignant programs for Android, detected with Origins Tracing™, will be expanded.