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January 30, 2023

How Vidar Malware Spreads via Malvertising on Google

Discover how Vidar info stealer malware is distributed through malvertising on Google and the risks it poses to users and organizations.
Inside the SOC
Darktrace cyber analysts are world-class experts in threat intelligence, threat hunting and incident response, and provide 24/7 SOC support to thousands of Darktrace customers around the globe. Inside the SOC is exclusively authored by these experts, providing analysis of cyber incidents and threat trends, based on real-world experience in the field.
Written by
Roberto Martinez
Devalyst, Threat Researcher
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30
Jan 2023

In recent weeks, security researchers and cyber security vendors have noted an increase in malvertising campaigns on Google, aimed at infiltrating info-stealer malware into the systems of unsuspecting victims, as reported in sources [1] [2]. It has been observed that when individuals search for popular tools such as Notepad++, Zoom, AnyDesk, Foxit, Photoshop, and others on Google, they may encounter ads that redirect them to malicious sites. This report aims to provide a high-level analysis of one such campaign, specifically focusing on the delivery of the Vidar Info-stealer malware.

Campaign Details

On the 25th of January 2023, Darktrace researchers observed that the advertisement depicted in Figure 1 was being displayed on Google when searching for the term "Notepad++" from within the United States.

Figure 1: Google Ad shown when searching for Notepad++

As can be seen in Figure 2, the advertisement in question had no visible information regarding its publisher.

Figure 2: Advertisement information

Clicking on the advertisement would direct potential victims to the website notepadplusplus.site, which had been registered on the 4th of January and is hosted on IP address 37.140.192.11. Upon selecting the desired version of the software, a download button is presented to the visitor.

Figure 3: Malicious site with fake Notepad++
Figure 4: Malicious site with fake Notepad++

When clicking on Download, regardless of the version selected, the traffic is then redirected to https://download-notepad-plus-plus.duckdns.org/, and a .zip file with name “npp.Installer.x64.zip” is downloaded.

Figure 5: Traffic redirection

Upon extraction, the file "npp.Installer.x64.exe" has a file size of 684.1 megabytes. The significant size is attributed to the inclusion of an excessive number of null bytes, which serve to prevent the file from being scanned by some Antivirus and uploaded to malware analysis platforms such as VirusTotal, which has a file size limit of 650 megabytes.

Figure 6: npp.Installer.x64.zip

Initially, padding was incorporated at the end of the executable, enabling individuals to remove it while maintaining a fully functional file. However, in the sample analysed in this report, padding was inserted into the binary's central region. This method renders the removal of padding more challenging, as simply deleting the zeroes would compromise the integrity of the file and impede its functionality during dynamic analysis.

Figure 7: Beginning of null bytes padding

Figure 8: End of null bytes padding

After execution, the malware promptly establishes a connection to a Telegram channel to acquire its command and control (C2) address, specifically http://95.217.16.127. If Telegram is not available, the malware will then attempt to connect to a profile on video game platform Steam, in which case the C2 address was http://157.90.148.112/ at the time of initial analysis and http://116.203.6.107 later. It then proceeds to check-in and obtain its configuration file and subsequently downloads get.zip, an archive containing several legitimate DLL libraries, which are utilized to extract information and saved passwords from various applications and browsers. Through traffic analysis, the method by which the malware obtains its Command and Control (C2) location, and analysis of the configuration obtained, it can be assessed with high confidence that the malware in question is the info-stealer known as Vidar. Vidar has been extensively covered by various cybersecurity organizations. Further information regarding this info-stealer and its origins can be found here[3].

Figure 9: Telegram traffic
Figure 10: Telegram channel containing the location of Vidar’s C2 address
Figure 11: Steam profile containing the location of Vidar’s C2 address
Figure 12: Vidar C2 traffic
Figure 13: Vidar configuration obtained from the C2
Figure 14: Libraries downloaded by Vidar

Campaign ID 827

The domain download-notepad-plus-plus.duckdns.org, from which the malware is distributed, resolves to the IP address 185.163.204.10. Using passive DNS, it has been determined that multiple domains also resolve to this IP address. This information suggests that the threat group responsible for this campaign is also utilizing advertising to target individuals searching for specific applications besides Notepad++, including:

  • OBS Studio
  • Davinci Resolve
  • Sqlite
  • Rufus
  • Krita

Furthermore, it has been observed that all the malware samples obtained in this investigation connect to the same Telegram channel, utilize the same two Command and Control IP addresses, and share the same campaign ID of "827".

Conclusion 

The recent proliferation of malvertising campaigns, which are employed by cyber-criminals to distribute malware, has become a significant cause for concern. Unlike more traditional infection vectors, such as email, malvertising is harder to protect against. Furthermore, the use of padding techniques to inflate the size of malware payloads can make detection and analysis more challenging.

To mitigate the risk of falling victim to such attacks, it is recommended to exercise caution when interacting with online advertisements. Specifically, it is advisable to avoid clicking on any advertisements while searching for free software on search engines and to instead download programs directly from official sources. This approach can reduce the likelihood of inadvertently downloading malware from untrusted sources. 

Another effective measure to counteract the threat of malicious ads is the utilization of ad-blocker software. The implementation of an ad-blocker can provide an additional layer of protection against malvertising campaigns and enhance overall cybersecurity.

Appendices

Indicators of Compromise

Filename        npp.Installer.x64.zip

SHA256 Hash  7DFD1D4FE925F802513FEA5556DE53706D9D8172BFA207D0F8AAB3CEF46424E8

Filename         npp.Installer.x64.exe

SHA256 Hash  368008b450397c837f0b9c260093935c5cef56646e16a375ba7c47fea5562bfd

Filename         rufus-3.21.zip

SHA256 Hash  75db4f8187abf49376a6ff3de0163b2d708d72948ea4b3d5645b86a0e41af084

Filename         rufus-3.21.exe

SHA256 Hash  169603a5b5d23dc2f02dc0f88a73dcdd08a5c62d12203fb53a3f43998c04bb41

Filename         DaVinci_Resolve_18.1.2_Windows.zip

SHA256 Hash  73f00e3b3ab01f4d5de42790f9ab12474114abe10cd5104f623aef9029c15b1e

Filename         DaVinci_Resolve_18.1.2_Windows.exe

SHA256 Hash  169603a5b5d23dc2f02dc0f88a73dcdd08a5c62d12203fb53a3f43998c04bb41

Filename         krita-x64-5.1.5-setup.zip

SHA256 Hash  85eb4b0e3922312d88ca046d89909fba078943aea3b469d82655a253e0d3ac67

Filename         krita-x64-5.1.5-setup.exe

SHA256 Hash  169603a5b5d23dc2f02dc0f88a73dcdd08a5c62d12203fb53a3f43998c04bb41

URL      http://95.217.16.127/827

URL      http://95.217.16.127/get.zip

URL      http://95.217.16.127/

URL      http://157.90.148.112/827

URL     http://157.90.148.112/

URL      http://157.90.148.112/get.zip

URL      http://116.203.6.107/

Domain           notepadplusplus.site

Domain           download-notepad-plus-plus.duckdns.org

Domain           download-obsstudio.duckdns.org

Domain           dowbload-notepadd.duckdns.org

Domain           dowbload-notepad1.duckdns.org

Domain           download-davinci-resolve.duckdns.org

Domain           download-davinci.duckdns.org

Domain           download-sqlite.duckdns.org

Domain           download-davinci17.duckdns.org

Domain           download-rufus.duckdns.org

Domain           download-kritapaint.duckdns.org

IP Address      37.140.192.11

IP Address      185.163.204.10

IP Address      95.217.16.127

IP Address       157.90.148.112

IP Address      116.203.6.107

URL      https://t.me/litlebey

URL      https://steamcommunity.com/profiles/76561199472399815

References

[1] https://www.bleepingcomputer.com/news/security/hackers-push-malware-via-google-search-ads-for-vlc-7-zip-ccleaner/

[2] https://www.bleepingcomputer.com/news/security/ransomware-access-brokers-use-google-ads-to-breach-your-network/

[3] https://www.team-cymru.com/post/darth-vidar-the-dark-side-of-evolving-threat-infrastructure

Inside the SOC
Darktrace cyber analysts are world-class experts in threat intelligence, threat hunting and incident response, and provide 24/7 SOC support to thousands of Darktrace customers around the globe. Inside the SOC is exclusively authored by these experts, providing analysis of cyber incidents and threat trends, based on real-world experience in the field.
Written by
Roberto Martinez
Devalyst, Threat Researcher

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June 1, 2026

Defend What You Trust: Stories from the Front Lines of Modern Cyber Defense

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Modern attacks don’t always announce themselves, follow obvious patterns, or rely on known malware. Often, they move quietly inside trusted systems, authenticated sessions, and everyday behavior.

They don’t break in. They blend in.

That’s why an AI-powered defense is essential. It turns invisible signals into actionable insights at a scale neither analysts nor traditional tools can achieve alone.

Confidence is creating risk

One of the most dangerous assumptions in cybersecurity today is that strong controls equal strong protection.

Multi-factor authentication (MFA), for example, is widely viewed as a foundational safeguard. But as the CISO for a professional sports organization explains, that confidence can be misplaced. “A lot of organizations assume that once you have MFA, those accounts are safe. That’s not true.”

In one instance, his team identified a sophisticated attack where a threat actor bypassed MFA entirely, not by breaking it, but by going around it. A user’s authenticated session was hijacked and re-used, allowing the attacker to impersonate them without triggering traditional controls.

“Darktrace picked up that a session had been re-injected by the hacker, and we were able to block it right away,” he explains.

Attackers anticipate what we miss

Even well-trained users can become entry points.

“An email bypassed our existing security tools,” shares the VP of IT at a U.S.-based risk management services provider.  “The user missed one signal and entered their credentials into a malicious site. That’s what the bad guys count on.”

The organization responded quickly, but not before damage was done. Crucially, this occurred while Darktrace was in “watch mode,” before autonomous response was fully enabled. “Darktrace would have seen that and shut it down immediately,” he notes.

Mistakes and oversights like misconfigurations, forgotten machines, and missed patches can create serious vulnerabilities.

The CIO of a utility services organization shares an instance when Darktrace detected a breach to a client’s network via their ZTNA VPN due to misconfigured MFA. “Darktrace alerted us and autonomously blocked the scanning, preventing what could have been a ransomware-type incident.”  

The most dangerous threats are already inside

The Head of Security at a global business services provider knows firsthand how blind spots can persist inside environments. His team uncovered evidence of dormant ransomware artifacts sitting unnoticed within a company’s environment ¬¬– long before modern detection was in place.

“During a routine file transfer, Darktrace flagged the suspicious activity, identified the ransomware, and immediately quarantined the server,” he recalls.  While the attack was never executed, the implication was significant: the risk existed long before it was finally detected.

Cyber threats are also successful because they take advantage of normal human behavior, exploiting moments of cognitive overload, urgency, and trust.

The Executive Director of IT and Business Applications at a pharmaceutical lab describes the time Darktrace flagged an employee logging into Microsoft 365 from Singapore, despite him being physically located in the U.S. Darktrace immediately cut off his access and within minutes revealed that the employee’s son was using a VPN to play a video game.

While the threat was benign, it demonstrated the strength of AI to use contextual information to detect threats other tools miss. The information also saved security analysts hours of investigation and minimized downtime for the employee. “That level of precision and speed isn’t just convenient, it’s game changing.”

“Unusual” behavior is the new red flag

Detecting modern threats requires an understanding of what “normal” looks like and recognizing when something subtly deviates.

One security leader  at an AI technology enterprise described a scenario in which an employee connected to a proxy service in China. The service itself was legitimate, and although traditional tools didn’t flag it, the behavior was unusual for that user specifically.

“That’s what Darktrace picked up on. The activity turned out to be benign, but without visibility into behavioral deviations, it could just as easily have been something more serious.”

AI shifts defense from reaction to anticipation

These stories point to a fundamental shift by cyber attackers, both tactically and strategically. Because traditional security tools were built to detect what’s already known, modern attacks are often:

  • Credential-based, not malware-based
  • Behavioral, not signature-based
  • Subtle, not overt

They may operate within the boundaries of what appears normal, exploiting what organizations trust, not what they block:

  • Trusted sessions
  • Legitimate services
  • Human error

This is where AI is changing the equation. Rather than relying on predefined rules or known threat signatures, AI can:

  • Establish a baseline of normal behavior
  • Detect subtle anomalies in real time
  • Act autonomously to contain potential threats

Resilience, not perfection, is the new security standard

As these frontline experiences show, the organizations that lead are those that move beyond reactive defense and embrace AI as a core part of their strategy.

It eliminates the blind spots and uncertainty, says the CISO of a professional sports organization. “If you lack visibility, you’re not managing risk, you’re assuming it. AI gives you the actionable insights needed to turn uncertainty into control.”

And it provides the speed and agility that are vital when seconds matter, says the Executive Director of IT and Business Applications. “When Darktrace alerted us at 3:00 am to a ransomware attack, it had already quarantined the affected systems, blocked the attacker’s access, and provided us with the critical details and time needed to investigate. That action likely saved us hundreds of thousands, if not millions, of dollars.”

The modern SOC has become a cornerstone of enterprise resilience, responsible for protecting data and operational continuity while enabling digital growth and innovation. For today’s security professional, that means success is no longer measured by what they keep out, but by what they protect: revenue, reputation, and trust.

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May 28, 2026

From Efficiency to Exposure: How AI Adoption Is Creating Unseen Vulnerabilities on the Factory Floor

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How AI agents impact the manufacturing industry

Security teams and IT personnel across the manufacturing industry are under constant pressure to protect production, maintain uptime, and safeguard critical assets but the rise of AI is bringing huge new opportunities alongside new cyber risks. Across manufacturing, AI is embedded into workflows, decision-making, and increasingly, autonomous AI agents are acting on behalf of employees and systems.  

Agentic systems are powerful because they can act independently, but that same autonomy also creates cyber and operational risk. Agents have extensive permissions and are capable of carrying out complex tasks, making decisions, and interacting with tools or external systems with little to no human intervention.

Unlike traditional AI models that perform predefined tasks, AI agents use advanced techniques to mimic human decision-making processes, dynamically adapting to new challenges, making decision and taking action based on their own judgement. They look like employees operationally but lack judgment, ethics, or fear of consequences like humans do. This means they can be easily manipulated by cybercriminals, and an AI agent embedded across an OT network creates threats that extend well beyond data exposure. For example, at BMW, AI identifies faults in welding processes as they occur. At its Spartanburg plant, AI monitors the weld of 300-400 metal studs onto every SUV frame to detect misplaced or faulty studs and correct them instantly. Corruption of BMW’s AI system could lead to catastrophic quality control errors.

Adopting agentic AI systems across manufacturing raises some concerns across security teams. New data from our State of AI Cybersecurity survey shows that 78% of manufacturing security professionals are worried about employee use of AI agents – their top concern. That’s followed by employee use of generative AI tools like CoPilot and ChatGPT, a worry for 76% of security professionals at manufacturing organizations. As these tools gain more access to business data and processes, and more autonomy within organizations, security teams, who today have minimal visibility of agent activity in their environments, increasingly have sensitive data exposure (a worry for 60%) and accidental policy and regulatory violations (59%) on their minds.

External AI-powered threats are evolving just as quickly

The same capabilities transforming manufacturing are also reshaping cyberattacks.

AI is enabling attackers to automate reconnaissance, refine targeting, and adapt in real time. What once required time and manual effort can now be executed continuously and at scale. Manufacturers are already seeing the impact. According to manufacturing security professionals we surveyed, 76% are already being impacted by AI-powered threats and 90% see AI increasing the success of social engineering attacks.

And the techniques themselves are evolving. Concerns across the manufacturing sector show growing anxiety about the range of AI-powered attack routes, most pressingly of adaptive malware that evolves in real-time – a prospect half (49%) of manufacturing security professionals we surveyed are worried by, a full 9% more than the average across industries. AI adaptive malware is followed by:

  • Automated vulnerability scanning and exploit chaining (48%) which has become even more pressing as Anthropic’s new Mythos AI Model supercharges vulnerability discovery
  • Hyper-personalized phishing campaigns (46%), which remain a mainstay in hackers’ arsenals, and AI has amplified their effectiveness by making phishing emails more convincing and harder to detect.

This is not just an increase in volume, it is a shift toward threats that evolve as they unfold - often faster than static defenses can respond.

Despite rising awareness, many manufacturers are not yet equipped to manage this shift. More than half (51%) say they are not adequately prepared for AI-driven threats, and only 37% have formal policies governing AI deployment.  

Securing AI through visibility, context, and guardrails

Addressing this challenge does not require manufacturers to slow innovation. It requires a different approach to security, one that can operate at the same speed and scale as AI. Three specific priorities are emerging for manufacturers looking to take advantage of the power of AI.

Visibility is foundational.  

Organizations need to understand where AI is being used, what it can access, and how it behaves across both IT and OT environments. Without that, risk cannot be measured or managed. It is no surprise that Darktrace’s research found that 91% of manufacturing security professionals said that they need to understand how AI makes decisions before trusting it. This is even more critical in operational settings where disruption has safety, environmental, financial, and reputational impacts.

Context is what turns visibility into action.  

In environments shaped by AI, normal behavior is constantly shifting. Detecting threats requires a behavioral approach; understanding patterns of life across the organization and identifying subtle deviations in real time – a step change in organizations’ traditional approach to security and risk management.

Guardrails ensure that agency does not become exposure  

As AI systems take on greater responsibility, organizations need clear boundaries around what they can do and when they can act independently. These controls must be embedded into systems themselves, not applied after the fact.  

Securing AI Agents Across Manufacturing IT and OT

The rise of agentic AI is transforming manufacturing - powering next-generation operations while reshaping the security landscape. This is not just an increase in threats, but a shift to autonomous systems, continuously evolving behaviors, and risks moving at machine speed. For organizations trying to grapple with the challenge of enabling AI while managing the risk, visibility, context and guardrails should be foundational.

Darktrace helps manufacturers build secure AI approaches by making those foundations possible. It provides visibility and real-time detection and response to unusual activity across IT and OT environments and allows organizations to understand AI activity from the prompts employees use and the agents they build to how those agents are behaving across the environment. For manufacturers scaling AI, this delivers a foundation for innovation without sacrificing control.

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