(PC World) At least three security companies have scrubbed information related to Target from the Web, highlighting the ongoing sensitivity around one of the largest-ever data breaches.

How hackers broke into Target and installed malware on point-of-sale terminals that harvested up to 40 million payment card details is extremely sensitive. Now, details that give insight into the attack are being hastily removed or redacted, perhaps not to tip off hackers or jeopardize the investigation.

On Dec. 18, a malicious software sample was submitted to ThreatExpert.com, a Symantec-owned service. But the public report the service generated vanished.

The report was a technical description of how the Target malware functioned, including network drive maps, an IP address and a login and password for an internal company server.

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