Win32/sirefef.gen!e belongs to Trojan Family that makes its name by using stealthy method to open up a backdoor in the compromised system without your knowledge. So how to tell if you get infected by TrojanDropper:Win32/Sirefef.gen!E since some anti-virus programs will not be able to detect it.
Intensive CPU, memory is sapped, PC slows in general.
Firewall would not stay activated.
Browser would open itself automatically.
Pages with suspicious paid software prompt up during Internet surfing.
Some programs and files are gone somehow.
No Good to Delay Removal of Win32/sirefef.gen!e Trojan
The longer you have win32/sirefef.gen!e, the more likely your computer will be fatally wounded as more virus would be in. Based on the virus sample test we have done on our virtual machine, we have found that win32/sirefef.gen!e Trojan would help its family member Trojan:Win32/Sirefef!cfg to get into your computer after a short while. Exploit:Java/CVE-2012-0507 has been also found to help collect information stored in Java script. That’s why you are seeing more troubles like search page redirect and popup issue.
Being a Trojan dropper, win32/sirefef.gen!e opens up a backdoor on the system in a bid to receive command and download vicious items from a remote server for a complete infiltration as at the very first stage, win32/sirefef.gen!e carries few part to avoid easy detection by installed security utilities. Once TrojanDropper:Win32/Sirefef.gen!E anchors in the kernel part exploiting loophole in your system, there are tons of payloads waiting to be learned:
Copies itself to random subdirectory of %CurrentUser%\Application data\.
Creates new service value to systematic registries.
Injects itself into EXPLORER.exe. So, it can run if at least 1 process with name “explorer.exe” is running in the system; when infected, the Explorer.exe connects to remote host for receiving new commands.
Use crypto library to encrypt connections and to connect to remote command center via HTTPS.
At its core, win32/sirefef.gen!e Trojan is an information stealer serving to generate illegal income for the hacker behind it. To accomplish the information exchange, it firstly logs registry values and windows behavior for browsing history collection, it then inactivates firewall, anti-virus and other security applications to gather and forward confidential data to outside servers by using leaks in Windows security system. To stop the exchange and damages, an effective way is in desperate need before it is getting worse.
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