Phishing for dollars

Our accounting team recently received an email ostensibly from one of our suppliers requesting payment. Fortunately it was noticed and not paid. But what would be the most likely route for a spammer to know one of our vendors? We're reviewing procedures but wanted to get feedback from EE too. Thanks.
LVL 2
amigan_99Network EngineerAsked:
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Dave BaldwinFixer of ProblemsCommented:
If you are selling to the public, all they have to do is look at your product.
Michael FowlerSolutions ConsultantCommented:
A couple of ideas

The vendor could advertise the fact that you're a customer
The spammer did not know as such but took an educated guess, e.g. the vender sells engineering tools so we will send this attack to all engineering firms in the area

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David Johnson, CD, MVPOwnerCommented:
this scam has been around for at least 20 years. one must always match invoices to purchase orders
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amigan_99Network EngineerAuthor Commented:
btanExec ConsultantCommented:
Hope the article also help in assessment of your use case - supposedly they are opportunistic and either through word of mouth (via main/sub contractor or customers), social network like LinkedIn or online advertisement), those spammer can harvest easily email and pull off any one whom replied and fall into their trap and scam. Even CEO is not spared with recent CEO Fraud scam (sender spoofed as CEO email and send to colleague to wire transfer...)

http://www.experts-exchange.com/articles/17548/Stop-Think-Decide-THEN-Click.html
amigan_99Network EngineerAuthor Commented:
Thank you!
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