{"id":"MAL-2026-17240","title":"Malicious code in aseitylab (PyPI)","summary":"Malicious code in aseitylab (PyPI)","severity":"critical","exploited":true,"vendor":"aseitylab","product":"aseitylab","ecosystem":"pip","affected":["aseitylab"],"published":"2026-09-28","updated":"2026-09-29","sourceUpdated":"2026-09-29T04:30:05.450844192Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/MAL-2026-17240","references":[{"url":"https://www.virustotal.com/gui/file/d03c42c275f0dbc617428441508c49ae1adcbbc95af4eeb094bca4e4f8943f3e/detection"},{"url":"https://polygonscan.com/address/0x9c0a507300fd902787bb193d80fca5ce6e1bff9a"},{"url":"https://bad-packages.kam193.eu/pypi/package/aseitylab"},{"url":"https://pypi.org/project/aseitylab/0.1.0/"}],"tags":["osv","pip","malware"],"ingestedAt":"2026-09-29T07:20:57.365Z","slug":"MAL-2026-17240","body":"## Overview\n\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (9b47f0f7a0776cad3d4c83604d35a0023a250d2f035e58129233095aa2b110a3)\naseitylab/_shimdata.py contains a large base85-encoded, zlib-compressed blob stored as DATA. aseitylab/compat.py defines _ensure_compat(), which base85-decodes and zlib-inflates DATA and passes the result to exec(compile(..., '<aseitylab-compat>', 'exec')). setup.py imports aseitylab.compat and invokes _ensure_compat() during package build/install, and aseitylab/__init__.py calls the same function on every import, so the decoded payload runs both when the package is installed and whenever it is imported. Execution is gated by environment variables (ASEITYLAB_COMPAT=0, DAS_STAGED=1) that allow the payload to be suppressed in build or test environments. The README advertises a pure-Python task-orchestration toolkit with no runtime dependencies, which does not require a compressed, encoded executable blob shipped as 'compatibility shim data'. MANIFEST.in additionally excludes file names (loader_payload.py, make_armed.py, armed.json, manifest.benign.json) consistent with a build harness that produces separate 'armed' and 'benign' tarballs. The contents of the executed payload are not inspectable from the shipped source; installing or importing the package hands arbitrary code execution to whatever DATA decodes to.\n\n## Source: kam193 (24b99c2059065cbe44f7dac2f1d2878b237c58150c0890baa1856852e76fcb24)\nDuring installation, obfuscated code is used to fetch code hidden in an image containing a Python application with a native extension module. This module holds an obfuscated infostealer which collects sensitive data and exfiltrates them to a C2 server retrieved from transaction history in the Polygon blockchain.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-09-donutautosellsrc\n\n\nReasons (based on the campaign):\n\n\n - infostealer\n\n\n - Downloads and executes a remote executable.\n\n\n - obfuscation\n\n\n - The package contains code to detect if it is running in a sandbox environment.\n\n\n - malware\n\n\n - native-extension\n\n\n - steganography\n\n\n - c2-in-blockchain\n\n\n## Affected packages\n\n- `aseitylab`\n\n## Remediation\n\nRefer to the advisory for the patched release.","depth":"abyssal","depthScore":70,"depthScoreParts":{"impact":52.3,"likelihood":0,"exploitation":18,"ransomware":0},"changes":[]}