ISS Security Brief: UPDATED Sobig.F Mass-Email Worm - Trojan Horse Functionality
From: X-Force (xforce_at_iss.net)
To: email@example.com Date: Fri, 22 Aug 2003 13:14:38 -0400 (EDT)
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Internet Security Systems Security Brief
August 22, 2003
Sobig.F Mass-Email Worm - Trojan Horse Functionality
The latest variant in the "Sobig" family, Sobig.F is propagating
aggressively across the Internet. Sobig.F is propagating via email only,
and it is not related to the recent spate of Internet worms. Sobig.F
employs some new techniques to attempt to evade anti-virus software, and
infected computers may be controlled by external third-parties. It
contains hidden functionality that attempts to download and execute a file
at a specific time.
Aggressive propagation of mass-email worms have been known to cause
localized email outages due to the load placed on email servers. Sobig.F
contains backdoor code which may allow the author or originator of the worm
to control infected computers. This may allow the author to steal
information, run specific Trojan horse programs, or install unsolicited
email (Spam) relays. The new file payload is currently unknown as the virus
receives a URL to the new file at a certain time (3:00pm EDT).
For the complete ISS X-Force Security Alert, please visit:
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