Alert: Please be aware of new zero-day vulnerability!

Trend Micro issue a warning today as follows:
Dear All,
Please be advised of another Zero-Day attack affecting Microsoft Office Excel.
Please be careful with following action:
a. Do not open or save email attachment from Unknown or Untrusted sources.
b. Avoid opening or saving MS Excel files that you receive unexpectedly from trusted sources.
c. Practice extreme caution when browsing the internet or clicking on links in emails especially on “Untrusted websites”.
Impact:
An unspecified remote code-execution vulnerability has been identified in Microsoft Office Excel, which could be exploited by remote attackers to take complete control of an affected system, or cause the application to crash.
This issue affects all versions of Microsoft Office Excel, with a potential to allow arbitrary malicious code to run in the context of the user running the application and leads to a crash in Excel.
There is currently NO vendor-released patch available for all affected versions to address this threat.
However, malware containing exploits for this vulnerability will be detected as TROJ_MDROPPER.XR with OPR 5.861.00
Applications under Zero-Day Attack:
1. Microsoft Excel – http://www.microsoft.com/technet/security/advisory/968272.mspx (new)
2. Microsoft WordPad – http://www.microsoft.com/technet/security/advisory/960906.mspx

