Rewterz Threat Alert – Wanna Cryptor aka WannaCry Ransomware – Active IOCs

Severity

High

Analysis Summary

WannaCry also called WCry or WanaCrptor ransomware malware, was discovered in May 2017, it infected networks running Microsoft Windows as part of a massive cyberattack. This ransomware can encrypt all your data files and demands payment to restore the stolen information, usually in bitcoin with a ransom amount. WannaCry is one of the most dangerous malware ever used for cyberattacks. The attackers behind WannaCry ransomware uses a tool called Eternal Blue to exploit a vulnerability in the Windows Server Message Block or SMB Protocol. The WannaCry attack spread so rapidly and infected so many computers worldwide that many industries were affected. This ransomware has caused serious disruptions in the healthcare sector and financial sector and locked out users from their data.

Impact

• File Encryption

Indicators of Compromise

MD5

• 8cd3171731732dc900132cfe52b33dd8
• 28593ef6b71cb06b04a179e911c6a059
• a3474f8a6e675b30dcf3e612390c614e

SHA-256

• b024d90cd12719f7fe82e8a0b4310f56e6769c2640acefc564e222deabf6a839
• a9b267ea23a944e317cbae01826907002dfbd2ec28b05960f3bfbb7f61b33948
• 9f22c80e2fcfb99e09464439ebb781cb01a9bb8890bcb646880d1b22cae21e9b

SHA-1

• d7b069c83988e60d6be8657401041ee02adb96d8
• 9fecd695a1ce5fe33ed461f23811f3c0eda80d49
• a1a2407c6a6e2dd533016334d7260446723e432f

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.