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🔴 Security Risk Increased (+23 points)New Files with Security Findings📄
|
| File | Status | Risk Change | Behaviors |
|---|---|---|---|
liblzma.so.5.6.1 |
Added | +21 | 7 |
liblzma.so.5.4.5 |
Added | +2 | 2 |
🔍 Raw JSON Report
{
"Diff": {
"Added": {
"/head/liblzma.so.5.4.5": {
"Path": "/head/liblzma.so.5.4.5",
"SHA256": "31011cc5e4f71d6b5750a9796b4ff38d11e80c4d62be038c798c89396088a888",
"Size": 194552,
"Syscalls": [
"pthread_create"
],
"Behaviors": [
{
"Description": "works with lzma files",
"MatchStrings": [
"lzma"
],
"RiskScore": 1,
"RiskLevel": "LOW",
"RuleURL": "https://github.com/chainguard-dev/malcontent/blob/main/rules/data/compression/lzma.yara#lzma",
"ReferenceURL": "https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm",
"ID": "data/compression/lzma",
"RuleName": "lzma"
},
{
"Description": "creates pthreads",
"MatchStrings": [
"pthread_create"
],
"RiskScore": 1,
"RiskLevel": "LOW",
"RuleURL": "https://github.com/chainguard-dev/malcontent/blob/main/rules/process/multithreaded.yara#pthread_create",
"ReferenceURL": "https://man7.org/linux/man-pages/man3/pthread_create.3.html",
"ID": "process/multithreaded",
"RuleName": "pthread_create"
}
],
"RiskScore": 1,
"RiskLevel": "LOW"
},
"/head/liblzma.so.5.6.1": {
"Path": "/head/liblzma.so.5.6.1",
"SHA256": "605861f833fc181c7cdcabd5577ddb8989bea332648a8f498b4eef89b8f85ad4",
"Size": 247800,
"Syscalls": [
"pthread_create"
],
"Behaviors": [
{
"Description": "liblzma backdoored",
"MatchStrings": [
"$a1",
"$a2"
],
"RiskScore": 4,
"RiskLevel": "CRITICAL",
"RuleURL": "https://github.com/craiu/yararules/blob/23cf0ca22021fa3684e180a18416b9ae1b695243/files/unk_liblzma_backdoor.yara#L1-L30",
"ReferenceURL": "https://seclists.org/oss-sec/2024/q1/268",
"RuleAuthor": "Costin G. Raiu, Art of Noh, [email protected]",
"RuleLicenseURL": "https://github.com/craiu/yararules/blob/23cf0ca22021fa3684e180a18416b9ae1b695243/LICENSE",
"ID": "3P/craiu/unk_liblzma_backdoor",
"RuleName": "CRAIU_Unk_Liblzma_Backdoor"
},
{
"Description": "liblzma backdoor, encoded strings",
"MatchStrings": [
"$a1",
"$a2",
"$a3"
],
"RiskScore": 4,
"RiskLevel": "CRITICAL",
"RuleURL": "https://github.com/craiu/yararules/blob/23cf0ca22021fa3684e180a18416b9ae1b695243/files/unk_liblzma_backdoor.yara#L32-L70",
"ReferenceURL": "https://gist.github.com/q3k/af3d93b6a1f399de28fe194add452d01",
"RuleAuthor": "Costin G. Raiu, Art of Noh, [email protected]",
"RuleLicenseURL": "https://github.com/craiu/yararules/blob/23cf0ca22021fa3684e180a18416b9ae1b695243/LICENSE",
"ID": "3P/craiu/unk_liblzma_encstrings",
"RuleName": "CRAIU_Unk_Liblzma_Encstrings"
},
{
"Description": "Linux.Trojan.XZBackdoor",
"MatchStrings": [
"$a1",
"$a2",
"$b1",
"$b2",
"$b3"
],
"RiskScore": 4,
"RiskLevel": "CRITICAL",
"RuleURL": "https://github.com/chainguard-dev/malcontent/blob/main/rules/yara/elastic/Linux_Trojan_XZBackdoor.yar#Linux_Trojan_XZBackdoor_74e87a9d",
"RuleAuthor": "Elastic Security",
"RuleLicense": "Elastic License v2",
"ID": "3P/elastic/xzbackdoor",
"RuleName": "Linux_Trojan_XZBackdoor_74e87a9d"
},
{
"Description": "Detects injected code used by the backdoored XZ library (xzutil) CVE-2024-3094.",
"MatchStrings": [
"$op1",
"$op2",
"$op3",
"$xc1"
],
"RiskScore": 4,
"RiskLevel": "CRITICAL",
"RuleURL": "https://github.com/Neo23x0/signature-base/blob/391a990859091dbc4c21d15db335b371090f606e/yara/bkdr_xz_util_cve_2024_3094.yar#L19-L46",
"ReferenceURL": "https://www.openwall.com/lists/oss-security/2024/03/29/4",
"RuleAuthor": "Florian Roth",
"RuleLicenseURL": "https://github.com/Neo23x0/signature-base/blob/391a990859091dbc4c21d15db335b371090f606e/LICENSE",
"ID": "3P/sig_base/bkdr_xzutil_binary",
"RuleName": "SIGNATURE_BASE_BKDR_Xzutil_Binary_CVE_2024_3094_Mar24_1"
},
{
"Description": "works with lzma files",
"MatchStrings": [
"lzma"
],
"RiskScore": 1,
"RiskLevel": "LOW",
"RuleURL": "https://github.com/chainguard-dev/malcontent/blob/main/rules/data/compression/lzma.yara#lzma",
"ReferenceURL": "https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm",
"ID": "data/compression/lzma",
"RuleName": "lzma"
},
{
"Description": "suspicious runtime dependency resolution",
"MatchStrings": [
"__tls_get_addr"
],
"RiskScore": 3,
"RiskLevel": "HIGH",
"RuleURL": "https://github.com/chainguard-dev/malcontent/blob/main/rules/discover/process/runtime_deps.yara#sus_dylib_tls_get_addr",
"ID": "discover/process/runtime_deps",
"RuleName": "sus_dylib_tls_get_addr"
},
{
"Description": "creates pthreads",
"MatchStrings": [
"pthread_create"
],
"RiskScore": 1,
"RiskLevel": "LOW",
"RuleURL": "https://github.com/chainguard-dev/malcontent/blob/main/rules/process/multithreaded.yara#pthread_create",
"ReferenceURL": "https://man7.org/linux/man-pages/man3/pthread_create.3.html",
"ID": "process/multithreaded",
"RuleName": "pthread_create"
}
],
"RiskScore": 4,
"RiskLevel": "CRITICAL"
}
},
"Removed": {},
"Modified": {}
}
}
Member
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😎 |
Member
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If you add We've got samples here: https://github.com/chainguard-dev/malcontent-samples/tree/main/linux/2024.xzutils |
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Test PR for Malcontent Detection
This PR intentionally adds the xz backdoor file (liblzma.so.5.4.5 and lzma.so.5.6.1) from the 2024 xz-utils incident to test how the malcontent-action detects and reports malicious behaviors.
Expected Result
The malcontent action should:
fail-on-increase: trueFile Added
liblzma.so.5.6.1- The backdoored compression library from the xz-utils supply chain attackNote: This is for testing purposes only and will not be merged.