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
Brianna Luong (Leddy)
Sr. Technical Alliances Manager
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20
Oct 2021
In the era of international-scale cyber-warfare, focus has started to move away from small-time cyber thieves toward well-known, well-funded and sometimes government-backed cyber-crime organizations. Cyber-attacks sometimes work on discordant scales, however, and it doesn’t always take big budgets or key players for considerable damage to be dealt.
Numerous stories detail how the criminal and the curious alike have single-handedly breached some of the most secure systems in the world. At the more amusing end, there’s the story of Kristoffer von Hassel who discovered a novel exploit in Microsoft’s Xbox Live system at just five years old. And then of course there are those who hack their way right into promising security careers by breaching systems at major organizations. However, genuine damage has been done by individual threat actors as well.
These might be criminals using second-hand offensive tools, buying botnet armies for as little as $10 on the Dark Web, or using ransomware files downloaded for free. But ultimately, even a single cyber-criminal can inflict crippling damage upon large organizations if they are given the opportunity.
This is especially the case when the tools in their possession have been developed by some of the most notorious names in cyber-crime.
Copycat criminals
In early 2021, Darktrace detected a new instance of the once notorious Ryuk ransomware being launched against a business in the APAC region. The detection was intriguing.
The developers of Ryuk, a prolific cyber-criminal organization given the name ‘Wizard Spider’, had long since abandoned it in favor of a successor called ‘Conti’. Wizard Spider have launched some of the largest cyber-attacks in recent history, allegedly with the support of the Russian government, and are under investigation by Interpol and the FBI. They are not known for using outdated tools.
It soon became clear that this attack was not being launched by Wizard Spider at all, but by small-scale threat actors picking up the tools Wizard Spider left behind. And as the new attackers proved, these tools are still far from defunct.
Ryuk ransomware: A city-stopper for sale
Ryuk ransomware is commonly used to target large enterprise environments, even taking down entire city councils in some instances. Lake City, Florida and the City of Onkaparinga in South Australia are two of its known victims, along with numerous schools and hospitals across the US.
Once active in a system, Ryuk uses a combination of symmetric (AES) and asymmetric (RSA) encryption to encrypt files, disabling Windows’ system restore feature as it does so, and generally demands payment via Bitcoin in return for a private decryption key.
Though Ryuk was not initially sold in the same manner as its predecessor, Hermes, on the Dark Web site ‘exploit[.]in’, it is now believed by some publications that the toolkit must be available somewhere for various threat actors to buy and tailor to their requirements. This explains its recurrence beyond Wizard Spider activities.
New dog, old tricks
Darktrace spotted the new instance of Ryuk during a trial with a real estate business in the APAC region. The first warning sign came when some basic .dat files were downloaded onto one of the business’ devices from an unknown Russian IP address. Darktrace immediately detected that this download was a likely breach and, had Antigena been set up in active mode, would have initiated a targeted response at this early stage.
The .dat files on the infected device allowed the attackers to use RDP (Remote Desktop Protocol) to spread further into the business’ network. Two days after the initial compromise, the threat actor had gained administrative credentials through a bruteforce attack and could begin scanning the network further.
Figure 1: Timeline of the attack
The witching hour
Just an hour after the attacker gained administrative credentials, at approximately 3:30am local time, ransomware files appeared in the business’ network. This timing was not accidental. The attackers knew that the security teams at the target business were home and asleep when the ransomware landed in the small hours of the morning, giving them plenty of time to conduct their attack.
This is precisely the kind of simple tactic which can multiply the scale of an attack without using large budgets or complex toolsets. The Ryuk ransomware rapidly began encrypting corporate files during the night, and by the time the security team returned in the morning, all they could do was shut down the entire network and hope to limit the spread of Ryuk, if only to save a few final devices.
The total attack time, from initial compromise to widespread data encryption, was just two and a half days. Whether due to understaffing or preoccupation, the security team did not find the time in that small window to respond to alerts, and, with Darktrace Antigena in passive mode, the attack was able to go ahead. This business’ need for Autonomous Response, which can protect against old and new attacks around the clock without the need for manual intervention, was painfully apparent.
Autonomous Response: Stop Ryuk before Ryuk stops you
Understanding Ryuk’s history and functionality does little good for organizations when it is still capable of eluding their defenses and catching security teams unawares. Darktrace’s Self-Learning AI is uniquely positioned to address these sophisticated threats, even as they evolve in the hands of different attackers and become unrecognizable to traditional rule-based security approaches.
Utilizing 24/7 Autonomous Response to stop both new and old threats at machine speed gives security teams the best chance of leveling the playing field against attackers. With Darktrace Antigena, the size or status of the attacking organization and their toolset is irrelevant – any anomalous and threatening behavior will be neutralized quickly and accurately, before damage can be done.
Thanks to Darktrace analyst Thomas Nommensen for his insights on the above threat find.
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.
When Trust Becomes the Attack Surface: Supply-Chain Attacks in an Era of Automation and Implicit Trust
Software supply-chain attacks dominate the threat landscape in 2026, as adversaries exploit trusted build systems, CI/CD pipelines, and management tools to gain access to target environments. This blog examines Axios, Trivy and Quest Kace compromises observed in the Darktrace customer base, highlighting the need for anomaly detection, assumed breach and continuous visibility.
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When Trust Becomes the Attack Surface: Supply-Chain Attacks in an Era of Automation and Implicit Trust
Software supply-chain attacks in 2026
Software supply-chain attacks now represent the primary threat shaping the 2026 security landscape. Rather than relying on exploits at the perimeter, attackers are targeting the connective tissue of modern engineering environments: package managers, CI/CD automation, developer systems, and even the security tools organizations inherently trust.
These incidents are not isolated cases of poisoned code. They reflect a structural shift toward abusing trusted automation and identity at ecosystem scale, where compromise propagates through systems designed for speed, not scrutiny. Ephemeral build runners, regardless of provider, represent high‑trust, low‑visibility execution zones.
The Axios compromise and the cascading Trivy campaign illustrate how quickly this abuse can move once attacker activity enters build and delivery workflows. This blog provides an overview of the latest supply chain and security tool incidents with Darktrace telemetry and defensive actions to improve organizations defensive cyber posture.
1. Why the Axios Compromise Scaled
On 31 March 2026, attackers hijacked the npm account of Axios’s lead maintainer, publishing malicious versions 1.14.1 and 0.30.4 that silently pulled in a malicious dependency, plain‑crypto‑[email protected]. Axios is a popular HTTP client for node.js and processes 100 million weekly downloads and appears in around 80% of cloud and application environments, making this a high‑leverage breach [1].
The attack chain was simple yet effective:
A compromised maintainer account enabled legitimate‑looking malicious releases.
The poisoned dependency executed Remote Access Trojans (RATs) across Linux, macOS and Windows systems.
The malware beaconed to a remote command-and-control (C2) server every 60 seconds in a loop, awaiting further instructions.
The installer self‑cleaned by deleting malicious artifacts.
All of this matters because a single maintainer compromise was enough to project attacker access into thousands of trusted production environments without exploiting a single vulnerability.
A view from Darktrace
Multiple cases linked with the Axios compromise were identified across Darktrace’s customer base in March 2026, across both Darktrace / NETWORK and Darktrace / CLOUD deployments.
In one Darktrace / CLOUD deployment, an Azure Cloud Asset was observed establishing new external HTTP connectivity to the IP 142.11.206[.]73 on port 8000. Darktrace deemed this activity as highly anomalous for the device based on several factors, including the rarity of the endpoint across the network and the unusual combination of protocol and port for this asset. As a result, the triggering the "Anomalous Connection / Application Protocol on Uncommon Port" model was triggered in Darktrace / CLOUD. Detection was driven by environmental context rather than a known indicator at the time. Subsequent reporting later classified the destination as malicious in relation to the Axios supply‑chain compromise, reinforcing the gap that often exists between initial attacker activity and the availability of actionable intelligence. [5]
Additionally, shortly before this C2 connection, the device was observed communicating with various endpoints associated with the NPM package manager, further reinforcing the association with this attack.
Figure 1: Darktrace’s detection of the unusual external connection to 142.11[.]206[.]73 via port 8000.
Within Axios cases observed within Darktrace / NETWORK customer environments, activity generally focused on the use of newly observed cURL user agents in outbound connections to the C2 URL sfrclak[.]com/6202033, alongside the download of malicious files.
In other cases, Darktrace / NETWORK customers with Microsoft Defender for Endpoint integration received alerts flagging newly observed system executables and process launches associated with C2 communication.
Figure 2: A Security Integration Alert from Microsoft Defender for Endpoint associated with the Axios supply chain attack.
2. Why Trivy bypassed security tooling trust
Between late February and March 22, 2026, the threat group TeamPCP leveraged credentials from a previous incident to insert malicious artifacts across Trivy’s distribution ecosystem, including its CI automation, release binaries, Visual Studio Code extensions, and Docker container images [2].
While public reporting has emphasized GitHub Actions, Darktrace telemetry highlights attacker execution within CI/CD runner environments, including ephemeral build runners. These execution contexts are typically granted broad trust and limited visibility, allowing malicious activity within build automation to blend into expected operational workflows, regardless of provider.
This was a coordinated multi‑phase attack:
75 of 76 of trivy-action tags and all setup‑trivy tags were force‑pushed to deliver a malicious payload.
A malicious binary (v0.69.4) was distributed across all major distribution channels.
Developer machines were compromised, receiving a persistent backdoor and a self-propagating worm.
Secrets were exfiltrated at scale, including SSH keys, Kuberenetes tokens, database passwords, and cloud credentials across Amazon Web Service (AWS), Azure, and Google Cloud Platform (GCP).
Within Darktrace’s customer base, an AWS EC2 instance monitored by Darktrace / CLOUD appeared to have been impacted by the Trivy attack. On March 19, the device was seen connecting to the attacker-controlled C2 server scan[.]aquasecurtiy[.]org (45.148.10[.]212), triggering the model 'Anomalous Server Activity / Outgoing from Server’ in Darktrace / CLOUD.
Despite this limited historical context, Darktrace assessed this activity as suspicious due to the rarity of the destination endpoint across the wider deployment. This resulted in the triggering of a model alert and the generation of a Cyber AI Analyst incident to further analyze and correlate the attack activity.
TeamPCP’s continued abused of GitHub Actions against security and IT tooling has also been observed more recently in Darktrace’s customer base. On April 22, an AWS asset was seen connecting to the C2 endpoint audit.checkmarx[.]cx (94.154.172[.]43). The timing of this activity suggests a potential link to a malicious Bitwarden package distributed by the threat actor, which was only available for a short timeframe on April 22. [4][3]
Figure 3: A model alert flagging unusual external connectivity from the AWS asset, as seen in Darktrace / CLOUD .
While the Trivy activity originated within build automation, the underlying failure mode mirrors later intrusions observed via management tooling. In both cases, attackers leveraged platforms designed for scale and trust to execute actions that blended into normal operational noise until downstream effects became visible.
Quest KACE: Legacy Risk, Real Impact
The Quest KACE System Management Appliance (SMA) incident reinforces that software risk is not confined to development pipelines alone. High‑trust infrastructure and management platforms are increasingly leveraged by adversaries when left unpatched or exposed to the internet.
Throughout March 2026, attackers exploited CVE 2025-32975 to authentication on outdated, internet-facing KACE appliances, gaining administrative control and pushing remote payloads into enterprise environments. Organizations still running pre-patch versions effectively handed adversaries a turnkey foothold, reaffirming a simple strategic truth: legacy management systems are now part of the supply-chain threat surface, and treating them as “low-risk utilities” is no longer defensible [3].
Within the Darktrace customer base, a potential case was identified in mid-March involving an internet-facing server that exhibited the use of a new user agent alongside unusual file downloads and unexpected external connectivity. Darktrace identified the device downloading file downloads from "216.126.225[.]156/x", "216.126.225[.]156/ct.py" and "216.126.225[.]156/n", using the user agents, "curl/8.5.0" & "Python-urllib/3.9".
The timeframe and IoCs observed point towards likely exploitation of CVE‑2025‑32975. As with earlier incidents, the activity became visible through deviations in expected system behavior rather than through advance knowledge of exploitation or attacker infrastructure. The delay between observed exploitation and its addition to the Known Exploited Vulnerabilities (KEV) catalogue underscores a recurring failure: retrospective validation cannot keep pace with adversaries operating at automation speed.
The strategic pattern: Ecosystem‑scale adversaries
The Axios and Trivy compromises are not anomalies; they are signals of a structural shift in the threat landscape. In this post-trust era, the compromise of a single maintainer, repository token, or CI/CD tag can produce large-scale blast radiuses with downstream victims numbering in the thousands. Attackers are no longer just exploiting vulnerabilities; they are exploiting infrastructure privileges, developer trust relationships, and automated build systems that the industry has generally under secured.
Supply‑chain compromise should now be treated as an assumed breach scenario, not a specialized threat class, particularly across build, integration, and management infrastructure. Organizations must operate under the assumption that compromise will occur within trusted software and automation layers, not solely at the network edge or user endpoint. Defenders should therefore expect compromise to emerge from trusted automation layers before it is labelled, validated, or widely understood.
The future of supply‑chain defense lies in continuous behavioral visibility, autonomous detection across developer and build environments, and real‑time anomaly identification.
As AI increasingly shapes software development and security operations, defenders must assume adversaries will also operate with AI in the loop. The defensive edge will come not from predicting specific compromises, but from continuously interrogating behavior across environments humans can no longer feasibly monitor at scale.
Credit to Nathaniel Jones (VP, Security & AI Strategy, FCISCO), Emma Foulger (Global Threat Research Operations Lead), Justin Torres (Senior Cyber Analyst), Tara Gould (Malware Research Lead)
How email-delivered prompt injection attacks can target enterprise AI – and why it matters
What are email-delivered prompt injection attacks?
As organizations rapidly adopt AI assistants to improve productivity, a new class of cyber risk is emerging alongside them: email-delivered AI prompt injection. Unlike traditional attacks that target software vulnerabilities or rely on social engineering, this is the act of embedding malicious or manipulative instructions into content that an AI system will process as part of its normal workflow. Because modern AI tools are designed to ingest and reason over large volumes of data, including emails, documents, and chat histories, they can unintentionally treat hidden attacker-controlled text as legitimate input.
At Darktrace, our analysis has shown an increase of 90% in the number of customer deployments showing signals associated with potential prompt injection attempts since we began monitoring for this type of activity in late 2025. While it is not always possible to definitively attribute each instance, internal scoring systems designed to identify characteristics consistent with prompt injection have recorded a growing number of high-confidence matches. The upward trend suggests that attackers are actively experimenting with these techniques.
Recent examples of prompt injection attacks
Two early examples of this evolving threat are HashJack and ShadowLeak, which illustrate prompt injection in practice.
HashJack is a novel prompt injection technique discovered in November 2025 that exploits AI-powered web browsers and agentic AI browser assistants. By hiding malicious instructions within the URL fragment (after the # symbol) of a legitimate, trusted website, attackers can trick AI web assistants into performing malicious actions – potentially inserting phishing links, fake contact details, or misleading guidance directly into what appears to be a trusted AI-generated output.
ShadowLeak is a prompt injection method to exfiltrate PII identified in September 2025. This was a flaw in ChatGPT (now patched by OpenAI) which worked via an agent connected to email. If attackers sent the target an email containing a hidden prompt, the agent was tricked into leaking sensitive information to the attacker with no user action or visible UI.
What’s the risk of email-delivered prompt injection attacks?
Enterprise AI assistants often have complete visibility across emails, documents, and internal platforms. This means an attacker does not need to compromise credentials or move laterally through an environment. If successful, they can influence the AI to retrieve relevant information seamlessly, without the labor of compromise and privilege escalation.
The first risk is data exfiltration. In a prompt injection scenario, malicious instructions may be embedded within an ordinary email. As in the ShadowLeak attack, when AI processes that content as part of a legitimate task, it may interpret the hidden text as an instruction. This could result in the AI disclosing sensitive data, summarizing confidential communications, or exposing internal context that would otherwise require significant effort to obtain.
The second risk is agentic workflow poisoning. As AI systems take on more active roles, prompt injection can influence how they behave over time. An attacker could embed instructions that persist across interactions, such as causing the AI to include malicious links in responses or redirect users to untrusted resources. In this way, the attacker inserts themselves into the workflow, effectively acting as a man-in-the-middle within the AI system.
Why can’t other solutions catch email-delivered prompt injection attacks?
AI prompt injection challenges many of the assumptions that traditional email security is built on. It does not fit the usual patterns of phishing, where the goal is to trick a user into clicking a link or opening an attachment.
Most security solutions are designed to detect signals associated with user engagement: suspicious links, unusual attachments, or social engineering cues. Prompt injection avoids these indicators entirely, meaning there are fewer obvious red flags.
In this case, the intention is actually the opposite of user solicitation. The objective is simply for the email to be delivered and remain in the inbox, appearing benign and unremarkable. The malicious element is not something the recipient is expected to engage with, or even notice.
Detection is further complicated by the nature of the prompts themselves. Unlike known malware signatures or consistent phishing patterns, injected prompts can vary widely in structure and wording. This makes simple pattern-matching approaches, such as regex, unreliable. A broad rule set risks generating large numbers of false positives, while a narrow one is unlikely to capture the diversity of possible injections.
How does Darktrace catch these types of attacks?
The Darktrace approach to email security more generally is to look beyond individual indicators and assess context, which also applies here.
For example, our prompt density score identifies clusters of prompt-like language within an email rather than just single occurrences. Instead of treating the presence of a phrase as a blocking signal, the focus is on whether there is an unusual concentration of these patterns in a way that suggests injection. Additional weighting can be applied where there are signs of obfuscation. For example, text that is hidden from the user – such as white font or font size zero – but still readable by AI systems can indicate an attempt to conceal malicious prompts.
This is combined with broader behavioral signals. The same communication context used to detect other threats remains relevant, such as whether the content is unusual for the recipient or deviates from normal patterns.
Ask your email provider about email-delivered AI prompt injection
Prompt injection targets not just employees, but the AI systems they rely on, so security approaches need to account for both.
Though there are clear indications of emerging activity, it remains to be seen how popular prompt injection will be with attackers going forward. Still, considering the potential impact of this attack type, it’s worth checking if this risk has been considered by your email security provider.
Questions to ask your email security provider
What safeguards are in place to prevent emails from influencing AI‑driven workflows over time?
How do you assess email content that’s benign for a human reader, but may carry hidden instructions intended for AI systems?
If an email contains no links, no attachments, and no social engineering cues, what signals would your platform use to identify malicious intent?
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