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Volexity Blames ‘DriftingCloud’ APT For Sophos Firewall Zero-Day

By Ryan Naraine on June 16, 2022

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Massive-game malware hunters at Volexity are shining the highlight on a classy Chinese language APT caught just lately exploiting a Sophos firewall zero-day to plant backdoors and launch man-in-the-middle assaults.

The Sophos firewall vulnerability — tracked as CVE-2022-1040 — was patched in March this yr however solely after Volexity intercepted a classy zero-day that uncovered Sophos customers to distant code execution assaults.

“This explicit assault leveraged a zero-day exploit to compromise the [victim company] firewall. Volexity noticed the attacker implement an attention-grabbing webshell backdoor, create a secondary type of persistence, and finally launch assaults in opposition to the [victim’s] workers,” Volexity stated in a analysis report.

“These assaults aimed to additional breach cloud-hosted internet servers internet hosting the group’s public-facing web sites. Such a assault is uncommon and tough to detect, the corporate stated in a analysis observe with technical particulars on the incident.

Volexity stated its community safety monitoring service flagged the problem after noticing anomalous exercise emanating from a buyer’s Sophos Firewall. The corporate’s  forensic investigation led to the invention of a backdoor on the firewall, in addition to proof of exploitation relationship again to March 5, 2022. 

[ READ: Sophos Firewall Customers Hit by Zero-Day Assaults ]

As soon as it found the attacker was utilizing entry to the firewall to conduct man-in-the-middle (MITM) assaults, Volexity’s researchers expanded the probe and located the APT group utilizing knowledge collected from these MITM assaults to compromise extra techniques exterior of the community the place the firewall resided.

The corporate attributed the assault to an APT group tracked a ‘DriftingCloud’ and launched IOCs (indicators of compromise) to assist defenders hunt for indicators of compromise.

The Volexity analysis report included a blow-by-blow of the assault path used to backdoor the Sophos Firewall with a webshell that may very well be accessed by way of any URL of the attacker’s selecting. 

Along with this webshell element, Volexity stated it discovered a number of different actions carried out by the attacker on the Sophos Firewall that additional compromised the sufferer and ensured persistence. For instance, the group created VPN person accounts and related certificates pairs on the firewall to facilitate authentic distant community entry. 

[ READ: Essential Distant Code Execution Vulnerability in Sophos Firewall ]

“Whereas having access to the goal’s Sophos Firewall was probably a main goal, it seems this was not the attacker’s solely goal. Volexity found that the attacker used their entry to the firewall to switch DNS responses for specifically focused web sites in an effort to carry out MITM assaults,” the corporate stated.

The modified DNS responses have been for hostnames that belonged to the sufferer group and for which they administered and managed the content material. This allowed the attacker to intercept person credentials and session cookies from administrative entry to the web sites’ content material administration system (CMS).

In a number of circumstances, Volexity caught the attacker accessing the CMS admin pages of the sufferer group’s web sites with legitimate session cookies they’d hijacked.

The Sophos firewall product has been a serious goal for superior attackers focusing on companies. During the last yr, Sophos has been busy responding to main safety defects in its firewall merchandise.  The British safety know-how vendor has beforehand acknowledged its firewall zero-day attae.

Associated: Sophos Warns of Assaults Exploiting Current Firewall Vulnerability

Associated: Essential Distant Code Execution Vulnerability in Sophos Firewall

Associated: Malware Delivered to Sophos Firewalls through Zero-Day Vulnerability

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