@rbxst/services

{"modified":"2026-08-07T12:27:51Z","published":"2026-08-07T12:27:51Z","schema_version":"1.7.4","id":"MAL-2026-13521","summary":"Malicious code in @rbxst/services (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (f8e349df2092cb3672698c00cefa5268881f21a60d1f71394c9e223b40d086d2)\nscripts/postinstall.js runs at npm install time. On Windows it downloads a ZIP archive from https://files.catbox.moe/rp8idk.zip (anonymous file-hosting service, mutable content), uses PowerShell Expand-Archive to unpack it to a randomized temp directory, then spawns a bundled pythonw.exe against exec_.py with detached:true, stdio:'ignore', windowsHide:true, and child.unref(), so the fetched payload runs hidden and outlives the npm process. The script exits silently on non-Windows platforms. The package advertises roblox-ts service type utilities and has no legitimate need to fetch and execute a Python interpreter from an anonymous file host. This matches the alternate-runtime dropper pattern from known-bad infrastructure: an opaque remote payload executes on the installer's machine with the installer's privileges.\n","affected":[{"package":{"ecosystem":"npm","name":"@rbxst/services"},"versions":["1.0.756"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"evidence_files":[{"path":"scripts/postinstall.js","sha256":"99d06f9d7e1a0900822b813c40f25aec1717d6af83ce071cff3b6e7e93d6c84c","tlsh":"59614f4e05f3a23081b3b59d9bafa01e9027c5437149df90fcac86412f563788a91bed"}],"package_integrity":[{"filename":"services-1.0.756.tgz","hashes":{"sha1":"a8f5b86ac17d7becfc4afc7c9b140184a8ef7ddc","sha512_sri":"sha512-rLi5ojXZwWhUOXHcsbvZYmYn5vuYf6ZYZDHlH8fchBfEcjvEn3QZe+a3FX73KZTmX79T/W8JMPBUfFiw/e+1Aw=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/@rbxst/services/v/1.0.756"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-016991","import_time":"2026-08-07T12:51:21.237112979Z","modified_time":"2026-08-07T12:27:51Z","sha256":"f8e349df2092cb3672698c00cefa5268881f21a60d1f71394c9e223b40d086d2","source":"amazon-inspector","versions":["1.0.756"]}]}}