What Happened
The Russia-aligned threat actor known as UAC-0099 has been attributed to a previously undocumented .NET infostealer and remote access trojan (RAT) codenamed ASHVEIN. According to TrendAI, the malware has been put to use in attacks targeting Ukrainian government personnel. The cybersecurity company is tracking the cluster under the name Earth Sirrush (previously SHADOW-EARTH-065). ASHVEIN,
Why It Matters
The report describes UAC-0099 using ASHVEIN, a .NET infostealer and remote-access trojan, to target Ukrainian government personnel. The malware reportedly steals browser credentials, captures screenshots, retrieves files, executes PowerShell commands, and hides tasking in invisible HTML elements. No use of artificial intelligence is reported; classification as malicious AI use is therefore a fallback based on the allowed categories, while RealGround analysis indicates that the primary threat is conventional malware and espionage requiring broader security governance and adversary simulation.
RealGround Analysis
This signal maps to malicious AI use. Organizations using AI agents, LLM APIs, SaaS integrations, or sensitive data workflows should review whether this class of issue could create unauthorized tool execution, data leakage, weak approval gates, or unmanaged supply-chain exposure.
Recommended Actions
- Restrict AI agent tool permissions and production write paths.
- Review sensitive data access across prompts, logs, embeddings, memory, and SaaS integrations.
- Add human approval workflows for high-impact or state-changing actions.
- Run prompt injection and indirect prompt injection tests against affected workflows.
- Document the owner, control gap, and remediation deadline for this risk class.
Source
https://thehackernews.com/2026/10/uac-0099-targets-ukrainian-government.html