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HelloKitty is launching a DDoS attack by exploiting known vulnerabilities

Threat Level – Red | Vulnerability Report

For a detailed advisory, download the pdf file here.

The FBI has issued a warning to private businesses about a new feature of the HelloKitty ransomware group (aka FiveHands). The Hello Kitty/FiveHands actor (UNC2447) employs the double extortion strategy to place undue pressure on victims. If the victim fails to respond quickly or pay the ransom, the threat actors may launch a Distributed Denial of Service (DDoS) attack on the target company’s public website. HelloKitty achieves first access by exploiting known SonicWall flaws (CVE-2021-20016, CVE-2021-20021, CVE-2021-20022, CVE-2021-20023). Patches for these vulnerabilities are widely accessible.

Vulnerability Details

Actors Details

Indicators of Compromise (IoCs)

Patch Link

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0001

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0007

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010

References

https://www.ic3.gov/Media/News/2021/211029.pdf

https://apt.thaicert.or.th/cgi-bin/showcard.cgi?g=UNC2447

https://securityaffairs.co/wordpress/124059/malware/hellokitty-ransomware-fbi-alert.html

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