Detect Prettier eslint-config-prettier Embedded Malicious Code (CVE-2025-54313) in CrowdStrike LogScale
Detects exploitation indicators related to CVE-2025-54313, a supply chain compromise affecting the eslint-config-prettier npm package (Prettier). The package was trojanized with embedded malicious code (CWE-506), enabling arbitrary code execution during npm install or build processes. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
MITRE ATT&CK
- Tactic
- Initial Access Execution Persistence
LogScale Detection Query
#event_simpleName IN (ProcessRollup2, NetworkConnectIP4, FileOpenInfo)
| $event_simpleName = "ProcessRollup2"
CommandLine = /(?i)eslint-config-prettier/
OR ParentCommandLine = /(?i)eslint-config-prettier/
| union (
#event_simpleName = "NetworkConnectIP4"
ImageFileName = /(?i)(node|npm)/
| LocalAddressIP4 != "127.0.0.1"
| RemoteAddressIP4 != "104.16.0.0/12"
)
| union (
#event_simpleName = "FileOpenInfo"
FilePath = /(?i)eslint-config-prettier/
| FileName = /\.(?:exe|dll|sh|ps1|bat)$/i
)
| select timestamp, ComputerName, UserName, CommandLine, ParentCommandLine, ImageFileName, RemoteAddressIP4, RemotePort, FilePath, FileName
| sort timestamp descCrowdStrike Falcon query detecting process execution referencing eslint-config-prettier, unexpected outbound network connections from node/npm processes, and binary file operations in package directories.
Data Sources
Required Tables
False Positives & Tuning
- Developer endpoints with eslint-config-prettier present before the malicious version was discovered
- CrowdStrike sensor telemetry from CI agents running npm install in sandboxed environments
- Legitimate node services connecting to corporate npm proxies not in the allowlist
Other platforms for CVE-2025-54313
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate Malicious postinstall Hook Execution via eslint-config-prettier
Expected signal: EDR should record: npm parent process spawning bash, bash executing malicious.sh, file creation of pwned.txt, outbound network attempt to 127.0.0.1:9999
- Test 2Detect eslint-config-prettier in Installed Node Modules
Expected signal: Process events showing find and python3 spawned from shell; file read events on node_modules/eslint-config-prettier/package.json across filesystem
- Test 3Simulate Outbound Exfiltration from Node Process Post-Install
Expected signal: EDR network telemetry showing node process initiating outbound TCP connection; process command line containing 'process.env' and network connection attempt
Unlock Pro Content
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