registry / Remote code execution / @deliveroo/reevent
@deliveroo/reevent
This report shows the evidence for @deliveroo/reevent@1.0.1, the only known version.
AI Security Review
scanned 3mo ago · by lpm-firewall-aiThe concrete preinstall chain into an obfuscated credential-aware payload that evaluates remote content is malicious behavior, not a package-aligned bootstrap.
Static reason
One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; source fingerprint signature matched known malicious package; routed for review
Trigger
npm preinstall
Impact
Arbitrary code execution and potential theft or abuse of npm/GitHub credentials.
Mechanism
remote payload execution with credential harvesting capability
Attack narrative
The preinstall hook runs setup.mjs, which runs the obfuscated math_init.js directly or first downloads a Bun executable from GitHub and runs it. The payload contains child-process execution, credential-token logic, and an eval of network-fetched response text, enabling remotely supplied code to run during installation.
AI rationale
The concrete preinstall chain into an obfuscated credential-aware payload that evaluates remote content is malicious behavior, not a package-aligned bootstrap.
Evidence
package.jsonsetup.mjsmath_init.js
Network endpoints1
github.com/oven-sh/bun/releases/download/bun-v1.3.13/
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs setup.mjs during preinstall.
- setup.mjs downloads Bun, then executes math_init.js at install time.
- math_init.js is heavily obfuscated and dynamically evals fetched response content.
- math_init.js references npm, GitHub token, and JWT credential handling.
- math_init.js invokes child_process and writes temporary files.
Evidence against
- setup.mjs names GitHub's Oven/Bun release URL for its bootstrap download.
- No benign package entrypoint or stated application functionality is present.
Behavioral surface
ChildProcessEvalFilesystemNetworkShell
HighEntropyStringsMinifiedUrlStrings
NoLicense
Source & flagged code
4 flagged · loading sourcepackage.jsonView file
•scripts.preinstall = node setup.mjs
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkgmath_init.jsView file
1// @bun @bun-cjs
L2: var MmgoCP,etDiOOB,JqTtnbZ,bc3Kak,ZQmUTyQ,TTUgga,MDX6yrw,h8wMJNB,CabwE2L,x5ErqV;function WV8StW(MmgoCP,etDiOOB,JqTtnbZ){for(JqTtnbZ=0x0;JqTtnbZ<etDiOOB;JqTtnbZ++)MmgoCP.push(MmgoCP...
Low
Eval
Package source references a known benign dynamic code generation pattern.
math_init.jsView on unpkg · L1setup.mjsView file
•matchType = normalized_sha256
matchedPackage = @ornikar/react-native-svg-transformer@1.0.11
matchedPath = setup.mjs
matchedIdentity = npm:[redacted]:1.0.11
similarity = 1.000
summary = normalized source hash matched finalized malicious source
Findings
3 High2 Medium6 Low
HighInstall Time Lifecycle Scriptspackage.json
HighKnown Malware Source Similaritysetup.mjs
HighKnown Malware Source Fingerprint Signaturesetup.mjs
MediumNetwork
MediumStructural Risk Force Deep Review
LowScripts Present
LowEvalmath_init.js
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
LowNo License
Affected versions and remediation
This report applies to @deliveroo/reevent@1.0.1.
The versions list below shows the verdict for each recorded version.
- Avoid installing @deliveroo/reevent@1.0.1. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
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