The malware called "narilam" by Symantec was an old malware, previously detected and reported online in 2010 by some other names. This malware has no sign of a major threat, nor a sophisticated piece of computer malware. The sample is not wide spread and is only able to corrupt the database of some of the products by an Iranian software company, those products are accounting software for small businesses. The simple nature of the malware looks more like a try to harm the software company reputation among their customers.
Anyway, this is not a threat for general users and need no special care. Only the customers of those accounting software could make backup of their database and scan their system by updated antivirus products.
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