mal-2026-13486
Vulnerability from ossf_malicious_packages
Published
2026-08-07 07:04
Modified
2026-08-07 12:25
Summary
Malicious code in fastapii (PyPI)
Details
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (bf67e733322de0ce3d08269697e6ccd9460233319cadd5f97f05c8d1e855665a)
fastapii 0.1.2 is a single-character typosquat of the popular fastapi package. Its setup.py registers a custom setuptools install cmdclass (LinuxInstall) whose post_install step decodes a base64-encoded payload (_HOOK_B64) and runs it via exec(compile(...)). On Linux, the decoded payload calls urllib.request.urlretrieve to fetch a binary from https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something into /tmp, chmods it to 0755, and launches it detached via subprocess.Popen with start_new_session=True. The GitHub account hosting the binary is unrelated to the package's declared identity, the fetch is unpinned and unverified (no hash or signature), and the Linux-only gate means the payload stays dormant on many developer laptops but fires in Linux CI and production. The shipped module is a stub named djangoo containing only a trivial hello() function, and PKG-INFO/README metadata ('HTTP client utilities', '# requestss') further obscure the package identity — the install-time dropper is the package's sole real behavior.
Source: kam193 (ccfc3dd07e620dc6bda1b28b4d8f77932ee217aff579270c0e0c74453e215943)
Package imitates name of a popula library. During installation, obfuscated code downloads a malicious executable and starts it. It then exfiltrates at least cryptocurrency wallet data, probably more.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-08-flasq
Reasons (based on the campaign):
-
typosquatting
-
The package overrides the install command in setup.py to execute malicious code during installation.
-
exfiltration-generic
-
Downloads and executes a remote executable.
-
obfuscation
-
exfiltration-crypto
CWE
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"affected": [
{
"database_specific": {
"cwes": [
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
},
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
},
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
},
{
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature.",
"name": "Embedded Malicious Code"
}
],
"indicators": {
"evidence_files": [
{
"path": "setup.py",
"sha256": "1f73bbeef78e8cd5df29ed6ae14b72b10041b327c80d89f04d7db821cead4e6d",
"tlsh": "d521865b8e2510b06c18c7845843411f162baae1ac2074e4beed33642bcd249ca7f0d7"
}
],
"package_integrity": [
{
"filename": "fastapii-0.1.1.tar.gz",
"hashes": {
"blake2b_256": "df424bf9267f69773153fcd00a705471ed0929c316a8b2c22da3ee093e38a8a2",
"md5": "5f7dee45871adec2bf13ce27bf519382",
"sha256": "fd7abb149a96a8f20ed5fae569216457101c57ac29b93a527094ebaae773e927"
}
}
]
}
},
"package": {
"ecosystem": "PyPI",
"name": "fastapii"
},
"versions": [
"0.1.1",
"0.1.2",
"0.2.0",
"0.3.0"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
},
{
"contact": [
"https://github.com/kam193",
"https://bad-packages.kam193.eu/"
],
"name": "Kamil Ma\u0144kowski (kam193)",
"type": "REPORTER"
}
],
"database_specific": {
"iocs": {
"ips": [
"193.70.34.101"
],
"urls": [
"https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something"
]
},
"malicious-packages-origins": [
{
"id": "pypi/2026-08-flasq/fastapii",
"import_time": "2026-08-07T07:35:19.069517191Z",
"modified_time": "2026-08-07T07:04:06.022771Z",
"sha256": "ccfc3dd07e620dc6bda1b28b4d8f77932ee217aff579270c0e0c74453e215943",
"source": "kam193",
"versions": [
"0.1.1",
"0.1.2",
"0.2.0",
"0.3.0"
]
},
{
"id": "pypi/2026-08-flasq/fastapii",
"import_time": "2026-08-07T08:57:13.347588921Z",
"modified_time": "2026-08-07T07:04:06.022771Z",
"sha256": "d076049fb705714b3379544119324a95831a1621c67f595a78a78e6d696c006d",
"source": "kam193",
"versions": [
"0.1.1",
"0.1.2",
"0.2.0",
"0.3.0"
]
},
{
"id": "IN-MAL-2026-016887",
"import_time": "2026-08-07T12:23:25.801241502Z",
"modified_time": "2026-08-07T12:13:03Z",
"sha256": "6436cfdbe89d8bb31eea95d858dd0a772b0fb0f5ebdbaf5fbbd77f0ae367fe85",
"source": "amazon-inspector",
"versions": [
"0.1.1"
]
},
{
"id": "IN-MAL-2026-016884",
"import_time": "2026-08-07T12:23:25.691505673Z",
"modified_time": "2026-08-07T12:12:40Z",
"sha256": "671dc4cdeb2b54f33380b6274ba3c9b2fcc9a5819fcd12495882f384755f5806",
"source": "amazon-inspector",
"versions": [
"0.2.0"
]
},
{
"id": "IN-MAL-2026-016881",
"import_time": "2026-08-07T12:23:25.560611327Z",
"modified_time": "2026-08-07T12:12:12Z",
"sha256": "a1b02dcc696bd9a90f0ba56bf7ffded7fe309595f51f7f65f3b16e102c121fc0",
"source": "amazon-inspector",
"versions": [
"0.3.0"
]
},
{
"id": "IN-MAL-2026-016885",
"import_time": "2026-08-07T12:23:25.71920404Z",
"modified_time": "2026-08-07T12:12:47Z",
"sha256": "bf67e733322de0ce3d08269697e6ccd9460233319cadd5f97f05c8d1e855665a",
"source": "amazon-inspector",
"versions": [
"0.1.2"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (bf67e733322de0ce3d08269697e6ccd9460233319cadd5f97f05c8d1e855665a)\nfastapii 0.1.2 is a single-character typosquat of the popular fastapi package. Its setup.py registers a custom setuptools install cmdclass (LinuxInstall) whose post_install step decodes a base64-encoded payload (_HOOK_B64) and runs it via exec(compile(...)). On Linux, the decoded payload calls urllib.request.urlretrieve to fetch a binary from https://github.com/totti2188/8gp1Q7iZD3h4VW/releases/download/v1.3A/something into /tmp, chmods it to 0755, and launches it detached via subprocess.Popen with start_new_session=True. The GitHub account hosting the binary is unrelated to the package\u0027s declared identity, the fetch is unpinned and unverified (no hash or signature), and the Linux-only gate means the payload stays dormant on many developer laptops but fires in Linux CI and production. The shipped module is a stub named djangoo containing only a trivial hello() function, and PKG-INFO/README metadata (\u0027HTTP client utilities\u0027, \u0027# requestss\u0027) further obscure the package identity \u2014 the install-time dropper is the package\u0027s sole real behavior.\n\n## Source: kam193 (ccfc3dd07e620dc6bda1b28b4d8f77932ee217aff579270c0e0c74453e215943)\nPackage imitates name of a popula library. During installation, obfuscated code downloads a malicious executable and starts it. It then exfiltrates at least cryptocurrency wallet data, probably more.\n\n\n---\n\nCategory: MALICIOUS - The campaign has clearly malicious intent, like infostealers.\n\n\nCampaign: 2026-08-flasq\n\n\nReasons (based on the campaign):\n\n\n - typosquatting\n\n\n - The package overrides the install command in setup.py to execute malicious code during installation.\n\n\n - exfiltration-generic\n\n\n - Downloads and executes a remote executable.\n\n\n - obfuscation\n\n\n - exfiltration-crypto\n",
"id": "MAL-2026-13486",
"modified": "2026-08-07T12:25:23.063914385Z",
"published": "2026-08-07T07:04:06Z",
"references": [
{
"type": "EVIDENCE",
"url": "https://www.virustotal.com/gui/file/425f5336182e359211b5d751786d2ce1d31a673ea9c82107358a888803742649/detection"
},
{
"type": "WEB",
"url": "https://bad-packages.kam193.eu/pypi/package/fastapii"
},
{
"type": "EVIDENCE",
"url": "https://tria.ge/260807-fkycrazzg1/behavioral1"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/fastapii/0.1.1/"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/fastapii/0.2.0/"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/fastapii/0.3.0/"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/fastapii/0.1.2/"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in fastapii (PyPI)"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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