Rewterz Threat Alert – 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

• 01bdc6fb077098f4a3b60f4b0e479a7f
• 0ab2aeda90221832167e5127332dd702

SHA-256

• 35c0e0c0e70565cfdc78ac708e122c2f65059ea337216418d674a343da90927e
• 64bb708b31b4b043018457c1098465ea83da7d6408c7029b2f68c333fc25891c

SHA-1

• 61acc362327a7df8f7672b905c62414f769beb61
• f370045d8ac3f4ba78acf8bfe4c4d35758d5ea05

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implement 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.