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Ever because the WannaCry assault in 2017, ransomware has remained some of the vital cyber threats worldwide. Ransomware is a kind of malicious software program that encrypts knowledge on a sufferer’s machine, rendering it inaccessible. The attacker then calls for a ransom, normally within the type of cryptocurrency, to revive the information.
Cisco Talos, one of many largest non-public menace intelligence groups in world, tracks ransomware tendencies throughout all their incident response engagements. Ransomware and pre-ransomware have been concerned in 20% of Talos engagements in Q1 2023. Pre-ransomware is an assault the place ransomware is current however by no means executes and encrypts knowledge.
There are numerous alternative ways to fight ransomware, however Safety Service Edge (SSE) options have a selected benefit as a result of they’ll disrupt ransomware actions throughout quite a few factors within the kill chain. SSE is a single, cloud-delivered answer centered on offering customers safe entry to the Web, cloud providers, and personal apps. And it could actually present these advantages to customers no matter whether or not they’re situated remotely, at a department workplace, or company headquarters.
SSE disrupts ransomware throughout a number of layers
SSE can assist fight ransomware with a spread of safety features similar to
DNS safety enforces insurance policies on area identify resolutions, stopping customers from accessing domains related to malicious actions. This blocks malicious web sites that trick customers into downloading ransomware. It additionally blocks entry on the DNS stage to command-and-control (C2) servers, that are utilized by the menace actor to speak with their malware. This interruption of the C2 channel hampers the attacker’s capacity to regulate the contaminated machine and might stop the encryption course of from being initiated.
DNS safety may also block DNS tunneling, a method by which the ransomware surreptitiously makes use of the DNS protocol to speak with its C2 servers or exfiltrate knowledge. There are a couple of methods to do that, and detecting the approach usually requires defenders to dig via logs and search for anomalous queries or different indicators. It’s engaging for attackers as a result of it’s comparatively easy to do and gained’t be detected by many safety instruments.
Along with DNS, SWG protects customers from ransomware by inspecting internet visitors in real-time. This consists of SSL decryption, which ensures that ransomware communications can’t cover in encrypted visitors.
Cloud-delivered firewalls examine visitors on the IP layer, enabling organizations to dam visitors to identified malicious IP addresses over non-web ports. For instance, many ransomware menace actors make the most of distant desktop protocol on port 3389 or safe shell protocol on port 22. Famously, the WannaCry variant of ransomware utilized the server message block protocol on port 445. Cloud-delivered firewalls permit defenders to watch and management visitors on these ports and protocols, and block communication over these ports to malicious IP addresses.
In Q1 2023, Talos additionally noticed for the primary time engagements involving Daxian ransomware, a more moderen ransomware-as-a-service (RaaS) household. This attacker usually compromises VPNs to realize preliminary entry to a community after which makes use of that VPN entry to unfold ransomware all through the community, in response to the U.S. Cybersecurity and Infrastructure Safety Company (CISA). In a single occasion, the attacker exploited a vulnerability within the VPN. In one other one, they have been in a position to brute power weak VPN credentials to realize entry.
This menace actor highlights the shortcomings of VPN. As soon as an attacker can compromise a company VPN, they’ll achieve wide-ranging entry to something on the community, permitting them to extensively unfold ransomware. The way in which to forestall any such assault is to undertake a zero-trust structure, the place customers are given entry solely to the assets that they want as an alternative of all the pieces on the community.
SSE makes use of ZTNA to create a zero-trust strategy to non-public app entry. ZTNA supplies safe distant entry to non-public apps primarily based on application-specific entry management insurance policies. If an attacker is ready to compromise this mechanism, they solely get entry to that software – not the whole community. This prevents the attacker from spreading ransomware in all places all through the community.
Conclusion
Ransomware assaults can have lengthy, sophisticated kill chains that embody quite a few methods to realize preliminary entry, obtain persistence, unfold the malware, and at last execute the encryption. SSE successfully disrupts this kill chain at a number of factors. It blocks customers from accessing malicious web sites which will infect their machine with malware, prevents the ransomware from speaking with its C2 servers throughout a number of layers, and limits ransomware unfold by imposing zero belief community entry for personal purposes.
Learn extra about how Cisco can shield you towards ransomware, or study extra about Safety Service Edge (SSE).
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