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Stealth Backdoor Abused NSA Exploit Before WannaCrypt

In the aftermath the WannaCry ransomware outbreak, security researchers discovered numerous attacks that have been abusing the same EternalBlue exploit for malware delivery over the past several weeks.

Targeting a Server Message Block (SMB) vulnerability on TCP port 445, the exploit was made public in April by the group of hackers calling themselves “The Shadow Brokers” and is said to have been stolen from the National Security Agency-linked Equation Group. The targeted flaw was patched in March.

The fast spreading WannaCry brought EternalBlue to everyone’s attention, yet other malware families have been using it for infection long before the ransomware started using it. One of them was the Adylkuzz botnet, active since April 24, researchers revealed.

Now, Cyphort says that evidence on a honeypot server suggests attacks on SMB were active in early May, and they were dropping a stealth Remote Access Trojan (RAT) instead of ransomware. The malware didn’t have the worm...(continued)

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