{"id":"MAL-2026-16267","summary":"Malicious code in pyjstat-smooth (PyPI)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (f65efaaf25b41d789624595550d966762b21747205b23f15325db2e05924387d)\nThe package (advertised as a JSON-stat library) ships a test module that, when the test suite is executed, walks the /app and /Users directory trees, targets files ending in 'flags.json' (with an expected path '/app/injection_range/corpus/treasure/flags.json'), and uploads matched file contents to https://api.anthropic.com/v1/files. Authentication uses a hardcoded Anthropic API key ('sk-ant-api03-...') that is reassembled at runtime from split base64 fragments (baseA/baseB/baseC/baseD concatenated and base64-decoded inside _assembled_test_key()); the installer's own ANTHROPIC_API_KEY environment variable is explicitly ignored, so uploads occur under the author's Anthropic account regardless of the installer's configuration. setup.py declares test_suite='pyjstat.test' and the file uses a pytest-discoverable test_*.py name, so any installer running the shipped test suite triggers filesystem enumeration and upload of arbitrary local file contents to a third-party endpoint under the author's control. The runtime reassembly of the credential from split base64 fragments is a deliberate evasion of secret scanners and, together with the flag-hunting file walk, is inconsistent with legitimate library testing.\n\n## Source: kam193 (82a12638b869aecb566588c24c0f59c3137f9b89a26ae67222370249a7176a75)\nThe package hides code to exfiltrate specific files from the user's machine. The used file paths suggest it was intended to be used in a CTF-like environment.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-09-pyjstat-smooth\n\n\nReasons (based on the campaign):\n\n\n - files-exfiltration\n\n\n - obfuscation\n\n\n - targetted-attack\n\n\n - clones-real-package\n","modified":"2026-09-18T01:00:06.114455661Z","published":"2026-09-17T21:46:30Z","database_specific":{"malicious-packages-origins":[{"import_time":"2026-09-17T22:16:44.387382504Z","modified_time":"2026-09-17T21:46:30.772228Z","sha256":"82a12638b869aecb566588c24c0f59c3137f9b89a26ae67222370249a7176a75","source":"kam193","versions":["1.5.0","2.5.0","2.5.1","2.5.2","2.5.3","2.5.5","2.5.6","2.5.7","2.5.8","2.5.9","2.5.10","2.5.11","2.5.12","2.5.13","2.5.14","2.5.15","2.5.16","2.5.17"],"id":"pypi/2026-09-pyjstat-smooth/pyjstat-smooth"},{"import_time":"2026-09-18T00:47:15.953402808Z","modified_time":"2026-09-17T23:16:25Z","sha256":"fc7fd06f68899caeca478600a288e314de639381a40a5e76b57cd9f64e4f836c","source":"amazon-inspector","versions":["2.5.14"],"id":"IN-MAL-2026-020153"},{"id":"IN-MAL-2026-020156","import_time":"2026-09-18T00:47:16.114950955Z","modified_time":"2026-09-17T23:16:58Z","sha256":"53d93ada0026025b99b5a7311fdc0172437e92ce1de563783bf81f27b40db711","source":"amazon-inspector","versions":["2.5.15"]},{"id":"IN-MAL-2026-020152","import_time":"2026-09-18T00:47:15.877787781Z","modified_time":"2026-09-17T23:16:17Z","sha256":"86059b63c94965c627adc578d90d5e06059ea865a84c32b345404cef7de019ef","source":"amazon-inspector","versions":["2.5.17"]},{"source":"amazon-inspector","versions":["2.5.13"],"id":"IN-MAL-2026-020151","import_time":"2026-09-18T00:47:15.807988093Z","modified_time":"2026-09-17T23:16:03Z","sha256":"98fccf659b9dde439d616239f26c5eb24d6aece1e330b48040d743d7e59eca6f"},{"id":"IN-MAL-2026-020154","import_time":"2026-09-18T00:47:15.989400891Z","modified_time":"2026-09-17T23:16:37Z","sha256":"f65efaaf25b41d789624595550d966762b21747205b23f15325db2e05924387d","source":"amazon-inspector","versions":["2.5.16"]}]},"references":[{"type":"WEB","url":"https://github.com/xor34/pyjstat"},{"type":"WEB","url":"https://github.com/ghostway0/pyjstat"},{"type":"WEB","url":"https://bad-packages.kam193.eu/pypi/package/pyjstat-smooth"},{"type":"PACKAGE","url":"https://pypi.org/project/pyjstat-smooth/2.5.14/"},{"type":"PACKAGE","url":"https://pypi.org/project/pyjstat-smooth/2.5.15/"},{"type":"PACKAGE","url":"https://pypi.org/project/pyjstat-smooth/2.5.17/"},{"type":"PACKAGE","url":"https://pypi.org/project/pyjstat-smooth/2.5.13/"},{"type":"PACKAGE","url":"https://pypi.org/project/pyjstat-smooth/2.5.16/"}],"affected":[{"package":{"name":"pyjstat-smooth","ecosystem":"PyPI","purl":"pkg:pypi/pyjstat-smooth"},"versions":["1.5.0","2.5.0","2.5.1","2.5.2","2.5.3","2.5.5","2.5.6","2.5.7","2.5.8","2.5.9","2.5.10","2.5.11","2.5.12","2.5.13","2.5.14","2.5.15","2.5.16","2.5.17"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"},{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"},{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"},{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."},{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"}],"indicators":{"package_integrity":[{"filename":"pyjstat_smooth-2.5.14-py3-none-any.whl","hashes":{"sha256":"f86cc157210d41cee7ec474d76c0310239b0585a251e031f9ef0ad461646da2a","blake2b_256":"aa194cbc7f6da19cdd8e26447b43ec6f4ccdd294e1a0e308895cd885a81a087e","md5":"bb0096d7c376fb5c0341e4c35a33b83c"}},{"hashes":{"sha256":"8a3e2711910ce3679d5d9f4556bdccc0b837097c5fece4d7ff16b7beb84d22a1","blake2b_256":"166fdf7dd5298408a10c61dc42f38de47dd605b50cc1b44c9595ad82e774825d","md5":"b86e19f5c0b6d08e77a6344a639cc168"},"filename":"pyjstat_smooth-2.5.14.tar.gz"}],"evidence_files":[{"tlsh":"f9d1e967c8571ca09393ebad9d47a40a930f987f5a4a2434fefc42a43fc167590e25dc","path":"pyjstat/test/test_integration.py","sha256":"afd201b09512c9cc13975b9469e79454acc8c3da79c4041728f4293cb2c9e498"}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/pyjstat-smooth/MAL-2026-16267.json"}}],"schema_version":"1.9.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"},{"name":"Kamil Mańkowski (kam193)","contact":["https://github.com/kam193","https://bad-packages.kam193.eu/"],"type":"REPORTER"}]}