Twitter users need to be on the lookout for a new round of
malware-carrying spam messages that are coming from compromised
accounts, possibly even from Twitter profiles they trust.
If you receive a direct message suggesting that someone has posted or
tagged you in a Facebook video, beware. Clicking on the link could
infect your computer with malware. According to the Sophos Naked
Security blog, the direct messages are not originating from spam
accounts, but instead compromised accounts of friends - which makes it
even more likely that a careless user could fall victim.
Although the messages vary, the common thread between all of
them is that they contain a "facebook.com/________" link and mention
that a video of you has been posted on Facebook. "Your in this
facebook.com/________ video, LOL" reads one spam message, while another
says "you even see him taping u, that's awful."
When an unsuspecting user clicks on the link, they are shown a
YouTube video player and prompted with a message that says, "and update
for YouTube player is needed. It says that it will install Flash Player
10.1 onto your computer, but instead installs "Troj/Mdrop-EML, a
backdoor Trojan that can also copy itself to accessible drives and
network shares," according to Sophos.
Of course, clicking on any link in a direct message that links
you offsite is risky, and the fact that these messages are coming from
trusted sources makes it especially tricky. However, the fact that the
messages contain various misspellings and gramatical errors should
suggest to the discerning user that they might not be legit.