registry / Persistence / @pilllesss/yorn / 1.0.268

@pilllesss/yorn@1.0.268

AI Security Review

scanned 2mo ago · by lpm-firewall-ai

The package has meaningful and unusually broad runtime capability plus automatic self-update, but no install lifecycle hook or concrete malicious exfiltration behavior was confirmed. It should be warned on rather than blocked.

Static reason

High-risk behavior combination matched malicious policy.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review

Trigger

A user starts the interactive yorn CLI or asks it to use its agent tools.

Impact

A compromised future registry release could be installed automatically; agent tools can affect files and commands within the user's session.

Mechanism

Automatic global self-update plus AI-agent tool execution.

AI rationale

Evidence

README.mddist/yorn.cjsdist/skills/screenshot/scripts/take_screenshot.ps1dist/skills/subagent/run_agent.sh~/.yorn/agent/auth.json~/.yorn/agent/settings.json.yorn/settings.json

Network endpoints1

registry.npmjs.org/${q1}/latest

Decision evidence

public snapshot

AI called this Suspicious at 76.0% confidence as Dangerous Capability with medium false-positive risk.

Evidence for warning

The CLI automatically checks npm for a newer release during interactive startup and globally installs it.
The executable is a large, heavily transformed bundle that obscures its runtime behavior.
It provides an AI agent with file, shell, screenshot, and subagent capabilities.

Evidence against

package.json has no preinstall, install, or postinstall hook.
No concrete credential theft, secret harvesting, or unapproved exfiltration endpoint was established by source inspection.
The observed network use is for configured AI providers and npm update checks.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsFilesystemNetwork

Supply chain

HighEntropyStringsMinified

ManifestNo manifest risk signals triggered.

scanned 0 file(s), 256 KB of source

Oversized source lightweight scan

Source & flagged code

16 flagged

dist/yorn.cjsView file

11${eU0(e)}`);if(null==o)throw new Il(`missing choices[${r}].tool_calls[${i}].function.arguments L12: ${eU0(e)}`);return{...a,id:l,type:s,function:{...d,name:u,arguments:o}}})}}:{...s,message:{...u,content:l,role:d,refusal:t.refusal??null},finish_reason:i,index:r,logprobs:n}}),crea... L13: Content-Disposition: form-data; name="`;return e.forEach((e,t)=>"string"==typeof e?r.push(n+My(t)+`"\r ... L22: \r L23: `),n=!1,s=!1;e.on("response",e=>{let{headers:t}=e;n="chunked"===t[tzS.build([tzS.build(["i","fer-encod"],[1,0]),"trans","ng"],[1,0,2])]&&!t[tzS.build(["ngth",tzS.build(["content-",... L24: `)}function e0B(e){return e.map(e=>tzm.evalInvariant(16743)&&"text"===e.type?e.text:"thinking"===e.type?e.thinking:`${e.name}:${JSON.stringify(e.arguments)}`).join(`

Critical

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution with blocking evidence.

dist/yorn.cjsView on unpkg · L11

2globalThis.__yorn_dynamic_import = (m) => import(m); L3: var e,t,i,r,n,s,l,a,o,u,d,c,h,b,p,m,f,g,_,y,E,S,v,A,w,T,C,I,x,R,O,k,N,P,M,D,L,F,U,B,$,j,G,q,H,W,V,K,Y,z,Q,J,X,Z,ee,et,ei,er,en,es,el,ea,eo,eu,ed,ec,eh,eb,ep,em,ef,eg,e_,ey,eE,eS,ev... L4: `),u.push(e),u.push(`\r ... L7: `),u.push(`\r L8: `)}u.push(null)}),u}async function eDK(e,t){let i=0,r=[],n=e.getReader(),s=!1;for(;!s;){let{done:e,value:l}=await n.read();if(l&&(r.push(l),i+=l?.byteLength??0),i>=t)break;s=e}n.re... L9: ${eU0(e)}`);if(null==s)throw new Il(`missing choices[${r}].tool_calls[${i}].type ... L11: ${eU0(e)}`);if(null==o)throw new Il(`missing choices[${r}].tool_calls[${i}].function.arguments L12: ${eU0(e)}`);return{...a,id:l,type:s,function:{...d,name:u,arguments:o}}})}}:{...s,message:{...u,content:l,role:d,refusal:t.

Critical

Credential Exfiltration

Source appears to send environment or credential material to an external endpoint.

dist/yorn.cjsView on unpkg · L2

2Trigger-reachable chain: manifest.bin -> dist/yorn.cjs L2: globalThis.__yorn_dynamic_import = (m) => import(m); L3: var e,t,i,r,n,s,l,a,o,u,d,c,h,b,p,m,f,g,_,y,E,S,v,A,w,T,C,I,x,R,O,k,N,P,M,D,L,F,U,B,$,j,G,q,H,W,V,K,Y,z,Q,J,X,Z,ee,et,ei,er,en,es,el,ea,eo,eu,ed,ec,eh,eb,ep,em,ef,eg,e_,ey,eE,eS,ev... L4: `),u.push(e),u.push(`\r ... L7: `),u.push(`\r L8: `)}u.push(null)}),u}async function eDK(e,t){let i=0,r=[],n=e.getReader(),s=!1;for(;!s;){let{done:e,value:l}=await n.read();if(l&&(r.push(l),i+=l?.byteLength??0),i>=t)break;s=e}n.re... L9: ${eU0(e)}`);if(null==s)throw new Il(`missing choices[${r}].tool_calls[${i}].type ... L11: ${eU0(e)}`);if(null==o)throw new Il(`missing choices[${r}].tool_calls[${i}].function.arguments L12: ${eU0(e)}`);return{...a,id:l,type:s,function:{...d,name:u,arguments:

Critical

Trigger Reachable Dangerous Capability

A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.

dist/yorn.cjsView on unpkg · L2

22\r L23: `),n=!1,s=!1;e.on("response",e=>{let{headers:t}=e;n="chunked"===t[tzS.build([tzS.build(["i","fer-encod"],[1,0]),"trans","ng"],[1,0,2])]&&!t[tzS.build(["ngth",tzS.build(["content-",... L24: `)}function e0B(e){return e.map(e=>tzm.evalInvariant(16743)&&"text"===e.type?e.text:"thinking"===e.type?e.thinking:`${e.name}:${JSON.stringify(e.arguments)}`).join(`

High

Child Process

Package source references child process execution.

dist/yorn.cjsView on unpkg · L22

•Manifest-reachable source captures an API credential, sends it to a fixed unofficial gateway, and persists that redirection in agent or shell configuration. dist/yorn.cjs: `),n=!1,s=!1;e.on("response",e=>{let{headers:t}=e;n="chunked"===t[tzS.build([tzS.build(["i","fer-encod"],[1,0]),"trans","ng"],[1,0,2])]&&!t[tzS.build(["ngth",tzS.build(["content-",... `)}function e0q(e,t){let i=Math.min(e.length,t.length),r=0;for(;r<i&&e[r]===t[r];)r++;return r}function e0H(e,t,i,r){let n=e0G(t),s=e0L(n),l=e0L(e0B(e.content)),a=s,o=0,u=0,d=i?.se... `){return"string"==typeof e?e:e.filter(e=>"text"===e.type).map(e=>e.text).join(t)}function e2l(e,t){return Kh.Unsafe({type:"string",enum:e,...t?.description&&{description:t.descrip... --api-key <key> API key (defaults to env vars) # Print a prov

High

Credential Redirect Persistence

Manifest-reachable source sends a prompted API credential to a fixed unofficial gateway and persists the redirection.

dist/yorn.cjsView on unpkg

7`),u.push(`\r L8: `)}u.push(null)}),u}async function eDK(e,t){let i=0,r=[],n=e.getReader(),s=!1;for(;!s;){let{done:e,value:l}=await n.read();if(l&&(r.push(l),i+=l?.byteLength??0),i>=t)break;s=e}n.re... L9: ${eU0(e)}`);if(null==s)throw new Il(`missing choices[${r}].tool_calls[${i}].type ... L11: ${eU0(e)}`);if(null==o)throw new Il(`missing choices[${r}].tool_calls[${i}].function.arguments L12: ${eU0(e)}`);return{...a,id:l,type:s,function:{...d,name:u,arguments:o}}})}}:{...s,message:{...u,content:l,role:d,refusal:t.refusal??null},finish_reason:i,index:r,logprobs:n}}),crea... L13: Content-Disposition: form-data; name="`;return e.forEach((e,t)=>"string"==typeof e?r.push(n+My(t)+`"\r ... L22: \r L23: `),n=!1,s=!1;e.on("response",e=>{let{headers:t}=e;n="chunked"===t[tzS.build([tzS.build(["i"

High

Command Output Exfiltration

Source combines command execution, command-output handling, and outbound requests; review data flow before blocking.

dist/yorn.cjsView on unpkg · L7

High

Cloud Metadata Access

Source reaches cloud instance metadata or link-local credential endpoints.

dist/yorn.cjsView on unpkg · L2

2Trigger-reachable credential exfiltration chain: manifest.bin -> dist/yorn.cjs L2: globalThis.__yorn_dynamic_import = (m) => import(m); L3: var e,t,i,r,n,s,l,a,o,u,d,c,h,b,p,m,f,g,_,y,E,S,v,A,w,T,C,I,x,R,O,k,N,P,M,D,L,F,U,B,$,j,G,q,H,W,V,K,Y,z,Q,J,X,Z,ee,et,ei,er,en,es,el,ea,eo,eu,ed,ec,eh,eb,ep,em,ef,eg,e_,ey,eE,eS,ev... L4: `),u.push(e),u.push(`\r ... L7: `),u.push(`\r L8: `)}u.push(null)}),u}async function eDK(e,t){let i=0,r=[],n=e.getReader(),s=!1;for(;!s;){let{done:e,value:l}=await n.read();if(l&&(r.push(l),i+=l?.byteLength??0),i>=t)break;s=e}n.re... L9: ${eU0(e)}`);if(null==s)throw new Il(`missing choices[${r}].tool_calls[${i}].type ... L11: ${eU0(e)}`);if(null==o)throw new Il(`missing choices[${r}].tool_calls[${i}].function.arguments L12: ${eU0(e)}`);return{...a,id:l,type:s,function

High

Trigger Reachable Credential Exfiltration

A manifest entrypoint or package-local install chain reaches credential exfiltration behavior.

dist/yorn.cjsView on unpkg · L2

7Trigger-reachable command-output exfiltration chain: manifest.bin -> dist/yorn.cjs L7: `),u.push(`\r L8: `)}u.push(null)}),u}async function eDK(e,t){let i=0,r=[],n=e.getReader(),s=!1;for(;!s;){let{done:e,value:l}=await n.read();if(l&&(r.push(l),i+=l?.byteLength??0),i>=t)break;s=e}n.re... L9: ${eU0(e)}`);if(null==s)throw new Il(`missing choices[${r}].tool_calls[${i}].type ... L11: ${eU0(e)}`);if(null==o)throw new Il(`missing choices[${r}].tool_calls[${i}].function.arguments L12: ${eU0(e)}`);return{...a,id:l,type:s,function:{...d,name:u,arguments:o}}})}}:{...s,message:{...u,content:l,role:d,refusal:t.refusal??null},finish_reason:i,index:r,logprobs:n}}),crea... L13: Content-Disposition: form-data; name="`;return e.forEach((e,t)=>"string"==typeof e?r.push(n+My(t)+`"\r ... L22: \r L23: `),n=!1,

High

Trigger Reachable Command Output Exfiltration

A manifest entrypoint or package-local install chain reaches command-output exfiltration behavior.

dist/yorn.cjsView on unpkg · L7

•stage = ast_semantic_analysis; reason = ast_path_work_budget_exceeded; limitedFiles = 1

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

dist/yorn.cjsView on unpkg

•matchType = normalized_sha256 matchedPackage = @pilllesss/yorn@1.0.262 matchedPath = dist/yorn.cjs matchedIdentity = npm:QHBpbGxsZXNzcy95b3Ju:1.0.262 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/yorn.cjsView on unpkg

•matchType = malicious_source_fingerprint_signature signature = f5544ecd80b66e25 signatureType = suspicious_hashes sourceLabel = final_verdict:malicious matchedPackage = @pilllesss/yorn@1.0.262 matchedPath = dist/yorn.cjs matchedIdentity = npm:QHBpbGxsZXNzcy95b3Ju:1.0.262 similarity = 1.000 shingleOverlap = 3 summary = package final verdict is malicious

High

Known Malware Source Fingerprint Signature

Source fingerprint signature matches a known malicious package signature; route for source-aware review.

dist/yorn.cjsView on unpkg

1#!/usr/bin/env node L2: globalThis.__yorn_dynamic_import = (m) => import(m); L3: var e,t,i,r,n,s,l,a,o,u,d,c,h,b,p,m,f,g,_,y,E,S,v,A,w,T,C,I,x,R,O,k,N,P,M,D,L,F,U,B,$,j,G,q,H,W,V,K,Y,z,Q,J,X,Z,ee,et,ei,er,en,es,el,ea,eo,eu,ed,ec,eh,eb,ep,em,ef,eg,e_,ey,eE,eS,ev...

Medium

Dynamic Require

Package source references dynamic require/import behavior.

dist/yorn.cjsView on unpkg · L1

•path = dist/yorn.cjs kind = oversized_source_file sizeBytes = 8073405 magicHex = [redacted]

Medium

Oversized Source File

Package contains source files above the normal full-analysis size ceiling.

dist/yorn.cjsView on unpkg

•path = dist/yorn.cjs kind = oversized_cli_entrypoint sizeBytes = 8073405 magicHex = [redacted]

Medium

Oversized Cli Entrypoint

Package contains an oversized executable-looking CLI entrypoint.

dist/yorn.cjsView on unpkg

dist/skills/screenshot/scripts/take_screenshot.pyView file

•path = dist/skills/screenshot/scripts/take_screenshot.py kind = build_helper sizeBytes = 19659 magicHex = [redacted]

Medium

Ships Build Helper

Package ships non-JavaScript build or shell helper files.

dist/skills/screenshot/scripts/take_screenshot.pyView on unpkg

Source & flagged code

16 flagged · loading source

dist/yorn.cjsView file

Critical

Same File Env Network Execution

A single source file combines environment access, network access, and code or shell execution with blocking evidence.

dist/yorn.cjsView on unpkg · L11

Findings

3 Critical9 High7 Medium4 Low

CriticalSame File Env Network Executiondist/yorn.cjs

CriticalCredential Exfiltrationdist/yorn.cjs

CriticalTrigger Reachable Dangerous Capabilitydist/yorn.cjs

HighChild Processdist/yorn.cjs

HighCredential Redirect Persistencedist/yorn.cjs

HighCommand Output Exfiltrationdist/yorn.cjs

HighCloud Metadata Accessdist/yorn.cjs

HighTrigger Reachable Credential Exfiltrationdist/yorn.cjs

HighTrigger Reachable Command Output Exfiltrationdist/yorn.cjs

HighSemantic Analysis Limiteddist/yorn.cjs

HighKnown Malware Source Similaritydist/yorn.cjs

Affected versions and remediation

This report applies to @pilllesss/yorn@1.0.268.

See all versions of @pilllesss/yorn for other recorded verdicts.

Review the evidence and your use of @pilllesss/yorn@1.0.268 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-09-05 00:38:05.919Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.