A Supply Chain Rat Exfiltrating to HuggingFace
A malicious npm package named js-logger-pack has evolved into a sophisticated remote access trojan (RAT) called MicrosoftSystem64. This malware exfiltrates data through HuggingFace and targets various systems, including cryptocurrency wallets and browsers. Despite being reported, the threat remains active, with ongoing surveillance of victims.
- ▪The js-logger-pack npm package evolved through 29 versions, becoming a full WebSocket stealer and binary dropper.
- ▪MicrosoftSystem64 is a multi-platform RAT that exfiltrates data to HuggingFace datasets and can execute 24 distinct remote commands.
- ▪The malware targets over 80 cryptocurrency wallet extensions and includes features like a cross-platform keylogger and periodic screenshot capture.
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Story provenance
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | SafeDep - Real-time Open Source Software Supply Chain Security |
| Canonical URL | https://safedep.io/microsoftsystem64-binary-payload-analysis/ |
| Publication time | Fri, 29 May 2026 10:14:25 +0000 |
| Retrieval time | 2026-05-29T10:20:00.361Z |
| Last seen | 2026-05-29T10:20:00.361Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 7lB6tDqypv0C |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Back to Blog Inside MicrosoftSystem64: A Supply Chain RAT Exfiltrating to HuggingFaceMalware SafeDep Team• May 28, 2026 • 19 min readTable of Contentsfunction l(){const t=document.querySelectorAll(".prose h1, .prose h2"),e=document.getElementById("toc-nav");if(!e||0===t.length)return[];const n=Array.from(t).map(((t,e)=>{const n=t.id||`heading-${e}`;return t.id=n,{id:n,text:t.textContent||"",level:parseInt(t.tagName.charAt(1),10)}}));return e.innerHTML="",n.forEach((t=>{const n=document.createElement("a");n.href=`#${t.id}`,n.textContent=t.text,n.dataset.level=t.level.toString(),n.className=`\n block text-body1-regular font-body transition-colors duration-200 hover:text-primary-300 truncate lg:max-w-[228px]\n ${1===t.level?"pl-0 text-neutral-300 font-medium":"pl-4 text-neutral-400"}\n…
Excerpt limited to ~120 words for fair-use compliance. The full article is at SafeDep - Real-time Open Source Software Supply Chain Security.
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