An email claiming to contain a video of one of the bombings of London instead hopes to lure victims into installing a Trojan Horse program onto their machines thereby handing control of their PCs to malicious parties.
This summary from Sophos seems to sum things up nicely.
Troj/Spexta-A may arrive as an email attachment in emails claiming to be from “CNN Newsletter” with subject line “TERROR HITS LONDON”. The Trojan is included as an attachment with filename “LondonTerrorMovie.zip”.
Every time tragedy reaches the headlines, the writers of these malicious programs use the headlines to try and use peoples curiosity against them (known as social engineering). You should by now know that every file attachment received in an email should be scanned by an up to date anti-virus program before it is run.
