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Interlock: The New Kid on the Block (and It’s a Bad One)

Interlock: The New Kid on the Block (and It’s a Bad One)

Interlock, the newest kid on the ransomware block, is causing quite a stir. This sneaky little malware is targeting critical infrastructure, specifically FreeBSD servers. It’s like they’re going after the low-hanging fruit, but with a twist.

How does Interlock work its magic?

Virtual Machine Hijacking: Interlock targets VMware ESXi hypervisors, taking over virtual machines and encrypting their data. It’s like a digital heist, but instead of robbing a bank, they’re robbing your virtual servers.
Data Extortion: Not only do they encrypt your data, but they also steal it. It’s like a double whammy: pay the ransom or risk having your sensitive data leaked online.
So, how can you protect yourself from this nasty piece of malware?

Patch your systems: Keep your software and firmware up-to-date.
Implement strong access controls: Use multi-factor authentication and restrict access to critical systems.
Back up your data: Regularly back up your data and store it offline.
Use endpoint detection and response (EDR) solutions: These tools can help detect and respond to attacks.
Remember, cybersecurity is an ongoing battle. Don’t let your guard down. Stay vigilant, stay informed, and stay safe.

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Interlock, the newest kid on the ransomware block, is causing quite a stir. This sneaky little malware is targeting critical infrastructure, specifically FreeBSD servers. It's like they're going after the low-hanging fruit, but with a twist.

How does Interlock work its magic?

Remember, cybersecurity is an ongoing battle. Don't let your guard down. Stay vigilant, stay informed, and stay safe.
  • Virtual Machine Hijacking: Interlock targets VMware ESXi hypervisors, taking over virtual machines and encrypting their data. It's like a digital heist, but instead of robbing a bank, they're robbing your virtual servers.
  • Data Extortion: Not only do they encrypt your data, but they also steal it. It's like a double whammy: pay the ransom or risk having your sensitive data leaked online.
So, how can you protect yourself from this nasty piece of malware?
  • Use endpoint detection and response (EDR) solutions: These tools can help detect and respond to attacks.
  • Patch your systems: Keep your software and firmware up-to-date.
    Implement strong access controls: Use multi-factor authentication and restrict access to critical systems.
  • Back up your data: Regularly back up your data and store it offline.

Interlock Ransomware - Detailed report

Interlock is a relatively new ransomware operation first detected in late September 202412. The group behind Interlock has targeted organisations worldwide, with a particular focus on the healthcare sector.

Targeting and Attack Vectors

Interlock employs an unusual approach compared to other ransomware operations by specifically targeting FreeBSD servers, an operating system commonly used in critical infrastructure. This suggests that Interlock operators are seeking to disrupt vital services and potentially demand  higher ransoms due to the impact of their attacks.

Key attack vectors include:

  • Exploiting vulnerabilities within virtual environments.
  • Compromising VMware's ESXi hypervisors, which allows the attackers to gain control of virtual machines (VMs) without affecting physical servers and workstations.
  • Encrypting virtual disk files (VMDKs) and changing root passwords on ESXi hosts, making data recovery extremely difficult.

Ransomware Execution and Impact

Interlock has developed both Windows and FreeBSD encryptors69. The Windows version clears Windows event logs and can delete itself using a DLL10.

During an attack, Interlock performs the following actions:

  • Data exfiltration: Breaches the corporate network and steals data from servers before deploying the ransomware.
  • Lateral movement: Spreads to other devices on the network.
  • Encryption: Deploys the ransomware to encrypt all files on the network, appending the .interlock extension to encrypted filenames.
  • Ransom note: Creates a ransom note named !!.txt in each folder, containing instructions for contacting the attackers and making payment.
  • Double extortion: Uses stolen data as leverage, threatening to publicly leak it on their data leak site if the ransom is not paid.

Ransom demands range from hundreds of thousands to millions of dollars, depending on the victim organisation's size.

Command and Control

Interlock establishes command and control (C2) through a scheduled task over an anonymized network, using a reverse shell for communication78. This sophisticated approach helps the ransomware evade detection by traditional network monitoring tools.

Malware Analysis and Detection

Foresiet, a digital security firm, has analysed Interlock's processes and identified several components that facilitate its malicious activities:

  • Processes: Leverages common system processes like rundll32.exe to load malicious DLLs from temporary directories.
  • Signatures: Displays unusual network requests associated with processes like rundll32.exe, serving as an indicator of compromise (IoC).
  • Network activity: Communicates with a C2 server over HTTPS (TLS-encrypted), concealing its traffic within legitimate web traffic.
  • Detecting Interlock requires advanced signature-based methods. Foresiet recommends using YARA rules to identify specific ELF binaries based on their internal structure, string patterns, and file size.

MITRE ATT&CK Techniques

Interlock utilises various techniques mapped to the MITRE ATT&CK framework. Some notable examples include:

  • Resource hijacking: Compromises virtual environments to control and disrupt crucial system resources.
  • Impair defenses: Deletes local backups and modifies security settings to prevent recovery efforts.
  • Signed binary proxy execution: Employs rundll32.exe to execute malicious DLLs and maintain persistence.
  • Obfuscated files or information: Uses encryption and anonymized networks to hide its communications and actions.
  • Application layer protocol: Communicates with C2 servers over HTTPS, concealing its traffic within legitimate web traffic.

Prevention and Mitigation

Organisations can take the following steps to protect themselves from Interlock ransomware:

  • Patch management: Regularly update systems, particularly those running virtual environments, to address known vulnerabilities.
  • Access controls and MFA: Enforce multifactor authentication (MFA) and robust access controls to prevent unauthorised access.
  • Backup strategy: Ensure regular backups and store them offline to protect against encryption and deletion.
  • Endpoint detection & response (EDR): Deploy EDR solutions to monitor for suspicious activities like unusual process execution or network traffic.

By implementing a multi-layered security approach, organisations can significantly reduce their risk of falling victim to Interlock and other sophisticated ransomware threats.

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CISO Blog

The Scourge of Vulnerabilities and Our Ever-Vigilant Duty

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Hold onto your hats, folks! We're diving headfirst into the murky waters of cyber vulnerabilities—a relentless scourge that’s as persistent as the Monday morning blues. In a world where everything and everyone is connected, staying vigilant isn’t just a best practice; it’s a downright necessity.

Let’s face it: vulnerabilities in our digital systems are the gifts that keep on giving—to cybercriminals, that is. Nobody wants to hear that their latest software update shipped with a gaping hole just begging to be exploited, yet here we are, playing an eternal game of cybersecurity whack-a-mole.

The problem is simple: as technology evolves, so do the avenues for attack. Every new feature, line of code, or interconnected device is a potential weak point waiting to be discovered. Don't get me wrong—I love new tech as much as the next person, but security needs to evolve with it, preferably at twice the speed.

Think back to the headlines: massive data breaches, ransomware attacks, and even critical infrastructure takedowns. These aren’t just abstract incidents happening elsewhere; they’re reality checks demanding our constant attention. And with the Internet of Things (IoT) ushering in a tech revolution, we’re adding new devices faster than ever, increasing our attack surface exponentially. Who knew your smart toaster could be the weak link in your home network’s defense?

So, what’s the takeaway here? Vigilance, cloud partners, is key. Ensuring the security of our systems isn’t a one-time affair—it requires ongoing diligence and a proactive approach. Here are some golden nuggets to keep in mind:

  1. Patch, Patch, Patch: It sounds like a broken record, but timely updates and patches are your first line of defense against newly discovered vulnerabilities. Outdated software is a cybercriminal’s playground.
  2. Comprehensive Monitoring: Keep tabs on your networks and systems with robust monitoring tools. The sooner you detect an anomaly, the faster you can respond before it snowballs into a crisis.
  3. Security Education: Arm your workforce with knowledge. Regular training sessions, phishing simulations, and awareness campaigns should be part of your innate company culture. The more your people know, the less likely they are to be the unwitting door-opener for an attack.
  4. Zero Trust Approach: Treat every connection as a potential threat. Implement identity verification at every access point and minimize trust zones within your network.
  5. Incident Response Plans: Like a fire drill, everybody should know what to do when the alarm sounds. A well-rehearsed incident response plan can mean the difference between a minor hiccup and a major meltdown.
  6. Community Sharing: The cybersecurity community thrives on collaboration. Sharing intelligence about vulnerabilities and attack vectors can help us bolster defenses collectively. Be part of the conversation.

In this age of rampant connectivity, imperfections are the norm. Vulnerabilities will exist, but our approach to managing them dictates whether we become sitting ducks or remain at the forefront of defense. The threat landscape is ever-changing, but so too is our capacity to adapt, innovate, and strengthen our digital fortresses.

As guardians of the cyber realm, let’s commit to not only recognizing the challenges but rising to meet them head-on. Our vigilance today is an investment in the security of tomorrow. Stay sharp, stay aware, and remember: in cyberspace, complacency is not an option—it’s a liability. So gear up, troubleshooters, and let’s keep our networks safe and sound. Another day, another battle—let’s win it together!

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Troublemaker CISO

Silly Thoughts Lead to Epic Failures: The Cybersecurity Circus of 2025

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Welcome to the wild world of cybersecurity in 2025, where organizations are still finding new ways to trip over the same proverbial rake, all while the mainstream media sensationalizes each breach like it’s the latest blockbuster hit. You’d think by now that companies would realize the door isn’t just wide open; it’s practically got a neon sign flashing “Welcome, Hackers!” with an arrow pointing straight to their data vaults.

Let’s face it: sometimes, a silly thought leads to an epic failure—but sometimes, it’s the absence of thought that gets us into trouble! Just the other day, I stumbled upon a report about Company X getting breached through a poorly coded API. I mean, seriously, folks? It’s like someone threw caution to the wind and thought, “Hey, why not push this disaster to production? What could possibly go wrong?” Sure, hindsight is 20/20, but you can bet that the attackers didn’t find that open API just lying around; they probably spent ages scouting it like some kind of digital treasure hunt.

We defenders know the drill. There are countless layers of security designed to keep the bad guys at bay, but let’s be real: the only guarantees in life are death, taxes, and the fact that there is no such thing as a truly secure system. Period. Now, imagine this scenario: our crafty attacker finds that golden API and begins their meticulous exploration. We throw around terms like “lateral movement” and “privilege escalation,” but really, it’s no different than watching a fox in the henhouse.

Once they’ve sniffed out the jewels—your personal information, trade secrets, whatever they can turn into cash—they start assessing those defenses in what can only be described as a ruthless game of chess. They poke, they prod, and they wait to see how we react—like military strategists plotting their next grand operation, because let’s be honest, they want those spoils without ending up in a shiny orange jumpsuit.

Now, let’s talk about the fallout for the CISO, who likely spent months if not years building up their defense strategy only to find themselves in epic trouble the moment things go south. If the breach is public enough, CISO could find themselves facing the axe, their name dragged through the mud while everyone wonders how they let this happen. But let’s not forget: if the CISO did their job right (and wasn't slacking off), they probably have documentation proving they rang the alarm bells and recommended necessary investments. Spoiler alert: leadership doesn’t necessarily prioritize funding for these recommendations—those discussions rarely make the headlines.

What happens next? After signing a gag order—oops, I mean a mutual separation agreement—the CISO walks away with a nice little cash settlement while the rest of us roll our eyes. Because here’s the kicker: most breaches are far from “point-and-click” attacks. The more sophisticated ones involve years of planning and a deep understanding of corporate networks, not just random DDOS attacks meant to annoy.

The chilling reality is that information security departments are stretched thinner than ever, expected to be omnipresent and all-knowing while facing tighter budgets, a shrinking workforce, and an ever-evolving tech landscape. It’s a high-wire act that would leave any seasoned performer with their heart in their throat.

So, as we continue to navigate this crazy cybersecurity circus in 2025, remember this: the stakes are high, the threats are real, and while we can acknowledge that silly thoughts lead to epic failures, we must also ensure that we’re all pulling our weight to mitigate the inevitable risks. After all, in the digital realm, ignorance is not bliss—it's a recipe for disaster. Now, I’d love to chat about this more, but that might just be NSFW!

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CISO Blog

Salt Typhoon, an advanced persistent threat

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Sun Tzu made the statement "If you know the enemy and know yourself, you need not fear the result of a hundred battles."

This highlights the significance of knowledge and strategy in overcoming adversaries. The more you know about your opponent, the better equipped you are to achieve victory.

So, to help you achieve that goal, here is some research on Salt Typhoon.

Salt Typhoon, an advanced persistent threat (APT) group, is a Chinese state-sponsored entity known for its cyber espionage activities and strategic operations aiming to disrupt critical infrastructures. Active since at least 2019, Salt Typhoon, also referred to as Earth Estries, FamousSparrow, GhostEmperor, and UNC2286, has been linked to China's Ministry of State Security (MSS). This affiliation provides them with significant resources, protection, and strategic direction.

Targets and Objectives

Salt Typhoon primarily targets telecommunications companies, government bodies, and technology firms to gather crucial intelligence and exert strategic influence. Their operations span globally, focusing on regions such as North America, Southeast Asia, and Africa. Key targets include:

  • Telecommunications Providers: Collecting call metadata, intercepting communications, and tracing target movements.
  • Hotels: Tracking locations and movements of significant individuals.
  • Government Agencies: Extracting sensitive information for intelligence purposes.
  • Internet Service Providers (ISPs): Compromising systems managing court-authorized wiretaps.

Additional targets include military institutions, solar energy companies, financial bodies, NGOs, engineering firms, and law practices, reflecting a broad interest in sectors holding strategic or sensitive data.

Tactics, Techniques, and Procedures (TTPs)

Salt Typhoon employs a range of sophisticated tactics to infiltrate and exploit targeted networks:

  • Exploiting Vulnerabilities: Using both known and zero-day vulnerabilities in public-facing systems to gain access. Notable exploits include ProxyLogon (CVE-2021-26855) and various vulnerabilities in VPN configurations.
  • "Living off the Land" Techniques: Employing legitimate tools like PowerShell for stealthy operations, including reconnaissance and data exfiltration.
  • Custom Malware: Deploying bespoke malware such as SparrowDoor, GhostSpider, and the Demodex rootkit to maintain persistence and evade detection.
  • DLL Search-order Hijacking: Used to covertly deploy backdoors like SparrowDoor.
  • Lateral Movement: Utilizing tools such as PsExec and WinRAR for network navigation and data compression; deploying Certutil and BITSAdmin for downloading malicious scripts.
  • Credential Harvesting: Employing tools like Mimikat_ssp and new NinjaCopy variants for credential extraction and file exfiltration.

Notable Campaigns

Salt Typhoon's operations have included high-impact campaigns:

  • ProxyLogon Exploitation (2021): A swift exploitation of Microsoft Exchange server vulnerabilities following patch releases.
  • Telecom Breaches (2024): Major breaches of US telecom giants like AT&T and Verizon, compromising sensitive communications data.
  • ISP Infiltration: Accessing sensitive ISP data, including information from legal wiretaps.
  • Political Targeting: Attempts to compromise phones of high-profile US political figures, indicating ambitions to influence political processes.

Government and Industry Responses

In response to Salt Typhoon's aggression, various measures have been implemented:

  • Cyber Unified Coordination Group: A US initiative to mitigate breaches and investigate security lapses.
  • Guidance Issuance: Recommendations for telecom sectors to detect, address vulnerabilities, and enhance cybersecurity.
  • China Telecom Ban: A move to limit possible espionage activities.
  • Enhanced Cybersecurity Measures: Promotion of zero-trust architecture, continuous monitoring, and collaboration between private and public entities.

Security agencies like CISA, NSA, and the FBI have also provided guidelines to strengthen defenses against such threats, emphasizing robust authentication processes and secure communications.

Impact and Implications

Salt Typhoon's espionage activities have significant ramifications:

  • Threatening Privacy and Security: Theft of communications records undermines privacy and security protocols.
  • Jeopardizing Law Enforcement: Breach of wiretap systems hampers law enforcement capabilities.
  • Critical Infrastructure Exposure: Endangers sectors crucial to national security and economic stability, highlighting vulnerabilities to external threats.
  • Political Process Influence: Attempts to compromise political figures imply a strategic approach to destabilize confidence in cybersecurity governance.

Defense Strategies

Organizations are advised to adopt comprehensive defense strategies to counteract Salt Typhoon:

  • Network Segmentation and Monitoring: Ensuring critical systems are isolated and network activity is consistently monitored.
  • Regular Patch Management: Keeping up-to-date with security patches to close vulnerability exploitation windows.
  • Zero Trust Architecture: Implementing strict access control, communication encryption, and principle of least privilege.
  • Threat Intelligence Utilization: Leveraging threat intelligence data to preemptively guard against known TTPs.
  • Secure by Design Principles: Encouraging integration of security measures throughout software development.

Salt Typhoon represents a significant cyber threat, equipped with sophisticated techniques and far-reaching strategic objectives. Their focus on espionage and infrastructure disruption urges a fortified global cybersecurity stance. Continuous vigilance strengthened cybersecurity protocols, and collaboration between public and private sectors.

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