This is the latest in a series of monthly charts counting down
the ten most frequently occurring viruses and hoaxes as compiled by
Sophos, a global leader in anti-virus protection for
For August 2003, the chart is as follows, with the most
frequently occurring virus at number one:
"August 2003 will be remembered as one of the worst months in
the history of computer security. A series of different viruses
have bombarded computer systems around the globe, culminating in
the newest member of the Sobig family which swamped internet email
traffic and took the pole position in the chart. The top four
viruses are all new entries - any of which would have been number
one in a normal month," said Graham Cluley, senior technology
consultant at Sophos Anti-Virus. "The Sobig-F worm clogged up
inboxes and crippled networks with the sheer volume of email
traffic it produced. Users and companies should remain on guard and
put systems in place to protect against future attacks."
Sophos analysed and protected against 778 new viruses in August.
The total number it now protects against is 84,277.
The top ten hoaxes reported to Sophos during August 2003 are as