Trojan:Win32/Fifesock.gen!B is a component of Win32/Fifesock - a multiple component trojan family that injects code into Internet Explorer and Firefox in order to steal the user’s social networking credentials for sites such as Facebook, Twitter and Blogspot, and then uses these credentials to send spam to their contacts. It may also download and execute arbitrary files. Some variants have also been observed to install rogue security software such as Rogue:Win32/Winwebsec.

Windows Defender detects and removes this threat.

It is a trojan that downloads other malware onto your PC from a malicious or compromised SkyDrive account.

The malware author can put any files in the SkyDrive account; we have seen the trojan attempt to download files related to the following families:

• Rogue:Win232/Winwebsec
• Trojan:Win32/Clodow
• PWS:Win32/Fareit
• Worm:Win32/Gamarue

This threat might have downloaded onto your PC from a malicious website.

You can read more in the Trojan:AutoIt/Clodow family description.

Windows Defender detects and removes this threat.

It is a trojan that downloads other malware onto your PC from a malicious or compromised SkyDrive account.

The malware author can put any files in the SkyDrive account; we have seen the trojan attempt to download files related to the following families:

• Rogue:Win232/Winwebsec
• Trojan:Win32/Clodow
• PWS:Win32/Fareit
• Worm:Win32/Gamarue

This threat might have downloaded onto your PC from a malicious website.

You can read more in the Trojan:AutoIt/Clodow family description.

Virus:Win32/Cutwail.J is a member of Win32/Cutwail - a multi-component family of malware that downloads and executes arbitrary files. This functionality is mostly used to install additional Cutwail components, and other malware on an affected machine. In general, the Cutwail family is used to compromise machines and direct them in various ways at the attacker's will, usually for monetary gain. This could include using the affected machine to distribute additional malware, send spam, generate 'pay per click' advertising revenue, harvest e-mail addresses, and break CAPTCHAs. Its components are varied, but include trojan downloaders and droppers, spammers, rootkits and viruses. Cutwail also employs a rootkit and other defensive techniques to avoid detection and removal.

TrojanDownloader:Win32/Bredolab is a detection for malware that connects to a remote server to download and execute other files.

Windows Defender detects and removes this threat.

It is a trojan that downloads other malware onto your PC from a malicious or compromised SkyDrive account.

The malware author can put any files in the SkyDrive account; we have seen the trojan attempt to download files related to the following families:

• Rogue:Win232/Winwebsec
• Trojan:Win32/Clodow
• PWS:Win32/Fareit
• Worm:Win32/Gamarue

This threat might have downloaded onto your PC from a malicious website.

Spammer:Win32/Fifesock.A is a component of Win32/Fifesock - a multiple component trojan family that injects code into Internet Explorer and Firefox in order to steal the user’s social networking credentials for sites such as Facebook, Twitter and Blogspot, and then uses these credentials to send spam to their contacts. It may also download and execute arbitrary files. Some variants have also been observed to install rogue security software such as Rogue:Win32/Winwebsec.

Windows Defender Antivirus detects and removes this threat.  

This trojan tries to connect your PC to a remote server to receive instructions from a malicious hacker. The hacker can then tell the trojan to perform any number of actions, including to download and run files. We have seen this trojan download variants of the rogue security scanner Rogue:Win32/Winwebsec.

There is more information in the Win32/Kuluoz family description.

TrojanDownloader:Win32/Stegvob is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.

Trojan:Win32/Fifesock.A is a component of Win32/Fifesock - a multiple component trojan family that injects code into Internet Explorer and Firefox in order to steal the user’s social networking credentials for sites such as Facebook, and then uses these credentials to send spam to their contacts. It may also download and execute arbitrary files. Some variants have also been observed to install rogue security software such as Rogue:Win32/Winwebsec.

PWS:Win32/Fifesock.gen!A is a component of Win32/Fifesock - a multiple component trojan family that injects code into Internet Explorer and Firefox in order to steal the user’s social networking credentials for sites such as Facebook, Twitter and Blogspot, and then uses these credentials to send spam to their contacts. It may also download and execute arbitrary files. Some variants have also been observed to install rogue security software such as Rogue:Win32/Winwebsec.

Exploit:JS/Pdfjsc.Z is an obfuscated JavaScript often distributed through compromised websites. It is designed to exploit several vulnerabilities in the web browser.

Win32/Fifesock is a multiple component trojan family that injects code into Internet Explorer and Firefox in order to steal the user’s social networking credentials for sites such as Facebook, Twitter and Blogspot, and then uses these credentials to send spam to their contacts. It may also download and execute arbitrary files. Some variants have also been observed to install rogue security software such as Rogue:Win32/Winwebsec.

Win32/Bredolab is a downloader which is able to download and execute arbitrary files from a remote host.

TrojanDownloader:Win32/Stegvob.gen!A is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.

Windows Defender detects and removes this threat.

This trojan downloads other malware onto your PC. It also opens a text file to try and fool you into thinking it's harmless.

There is more information about this type of threat in the Win32/Kuluoz family description.

Find out ways that malware can get on your PC.  

TrojanDownloader:Win32/Stegvob.A is a trojan that silently downloads and installs other programs without consent. This could include the installation of additional malware or malware components to an affected computer.