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Update third-party rules as of 2026-04-01 (#1447)
* Update third-party rules as of 2026-04-01 * add more third-party rules Signed-off-by: egibs <20933572+egibs@users.noreply.github.com> --------- Signed-off-by: egibs <20933572+egibs@users.noreply.github.com> Co-authored-by: Update third-party rules <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: egibs <20933572+egibs@users.noreply.github.com>
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‎rules/malware/supplychain/axios.yara‎

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import "hash"
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// start third-party
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// source: https://github.com/Neo23x0/signature-base/pull/395
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rule MAL_NPM_SupplyChain_Attack_Mar26: critical js {
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meta:
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description = "Detects package.json which include the malicious plain-crypto-js package as dependency"
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author = "Marius Benthin"
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date = "2026-03-31"
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reference = "https://www.stepsecurity.io/blog/axios-compromised-on-npm-malicious-versions-drop-remote-access-trojan"
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hash = "5e3e89c7351f385e36bb70286866a62957cc1aaab195539edb8c7bb62968a137"
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score = 80
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strings:
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$s1 = "\"dependencies\":"
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// This is the specific malicious package that was added to the npm registry, which is a typo-squatting of the popular crypto-js package
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$s2 = { 22 70 6C 61 69 6E 2D 63 72 79 70 74 6F 2D 6A 73 22 3A [0-3] 22 [0-2] 34 2E 32 2E } // "plain-crypto-js": "^4.2."
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condition:
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filesize < 10KB
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and all of them
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}
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// source: https://github.com/Neo23x0/signature-base/pull/395
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rule SUSP_JS_Dropper_Mar26: critical js {
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meta:
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description = "Detects suspicious JavaScript dropper used in plain-crypto-js supply chain attacks"
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author = "Marius Benthin"
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date = "2026-03-31"
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reference = "https://www.stepsecurity.io/blog/axios-compromised-on-npm-malicious-versions-drop-remote-access-trojan"
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hash = "e10b1fa84f1d6481625f741b69892780140d4e0e7769e7491e5f4d894c2e0e09"
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score = 70
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strings:
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$sa1 = "Buffer.from("
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$sa2 = "FileSync("
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$sa3 = ".replaceAll("
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$sb1 = ".arch()"
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$sb2 = ".platform()"
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$sb3 = ".release()"
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$sb4 = ".type()"
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condition:
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filesize < 10KB
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and all of ($sa*)
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and 2 of ($sb*)
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}
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/*
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* Axios npm Supply Chain Compromise - YARA Detection Rules
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* Date: 2026-03-31 | Version: 2
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* Author: Automated Analysis (Claude Code)
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* Reference: https://gist.github.com/N3mes1s/0c0fc7a0c23cdb5e1c8f66b208053ed6
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* Tested against all 5 payloads in isolated Lima VM
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*/
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// modified to include severity tags
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rule axios_dropper_setup_js: critical {
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meta:
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description = "Axios supply chain - obfuscated setup.js dropper"
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hash = "e10b1fa84f1d6481625f741b69892780140d4e0e7769e7491e5f4d894c2e0e09"
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date = "2026-03-31"
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strings:
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$xor = "OrDeR_7077"
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$entry = "_entry"
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$id = "6202033"
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condition:
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filesize < 10KB and $xor and $entry and $id
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}
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rule axios_win_stage1: critical windows {
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meta:
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description = "Axios supply chain - Windows download cradle (system.bat)"
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hash = "f7d335205b8d7b20208fb3ef93ee6dc817905dc3ae0c10a0b164f4e7d07121cd"
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date = "2026-03-31"
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strings:
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$cradle = "scriptblock]::Create"
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$post = "packages.npm.org/product1"
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condition:
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filesize < 500 and $cradle and $post
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}
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rule axios_win_ps_rat: critical windows {
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meta:
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description = "Axios supply chain - Windows PowerShell RAT"
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hash = "617b67a8e1210e4fc87c92d1d1da45a2f311c08d26e89b12307cf583c900d101"
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date = "2026-03-31"
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strings:
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$class = "Extension.SubRoutine"
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$var1 = "$rotjni"
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$var2 = "$daolyap"
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$rsp1 = "rsp_peinject"
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$rsp2 = "rsp_runscript"
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$rsp3 = "rsp_rundir"
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$rsp4 = "rsp_kill"
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condition:
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$class or ($var1 and $var2) or (3 of ($rsp*))
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}
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rule axios_macos_nukesped: critical macos {
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meta:
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description = "Axios supply chain - macOS NukeSped RAT"
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hash = "92ff08773995ebc8d55ec4b8e1a225d0d1e51efa4ef88b8849d0071230c9645a"
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date = "2026-03-31"
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strings:
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$mz = { CA FE BA BE }
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$build = "Jain_DEV"
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$project = "macWebT"
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$drop = "/private/tmp/.%s"
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$codesign = "codesign --force --deep --sign"
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$rsp1 = "rsp_peinject"
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$rsp2 = "rsp_runscript"
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condition:
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$mz at 0 and ($build or $project or ($drop and $codesign) or ($rsp1 and $rsp2))
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}
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rule axios_linux_python_rat: critical linux {
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meta:
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description = "Axios supply chain - Linux Python RAT (ld.py)"
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hash = "fcb81618bb15edfdedfb638b4c08a2af9cac9ecfa551af135a8402bf980375cf"
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date = "2026-03-31"
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strings:
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$fn1 = "do_action_ijt"
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$fn2 = "do_action_scpt"
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$fn3 = "do_action_dir"
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$rsp1 = "rsp_peinject"
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$rsp2 = "rsp_runscript"
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$rsp3 = "rsp_rundir"
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condition:
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($fn1 and $fn2 and $fn3) or (3 of ($rsp*))
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}
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rule axios_rat_generic: critical {
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meta:
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description = "Generic detection for any axios supply chain RAT"
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date = "2026-03-31"
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strings:
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$ua = "mozilla/4.0 (compatible; msie 8.0; windows nt 5.1; trident/4.0)"
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$b1 = "FirstInfo"
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$b2 = "BaseInfo"
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$b3 = "CmdResult"
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$r1 = "rsp_peinject"
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$r2 = "rsp_runscript"
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$r3 = "rsp_rundir"
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condition:
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($ua and 2 of ($b*)) or (3 of ($r*))
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}
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rule axios_c2_indicators: critical {
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meta:
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description = "Axios supply chain C2 network indicators"
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date = "2026-03-31"
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strings:
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$c2 = "sfrclak.com"
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$path = "/6202033"
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$p0 = "packages.npm.org/product0"
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$p1 = "packages.npm.org/product1"
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$p2 = "packages.npm.org/product2"
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condition:
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$c2 or ($path and any of ($p*)) or (2 of ($p*))
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}
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rule axios_injector_dll: critical windows {
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meta:
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description = "Extension.SubRoutine .NET injection DLL (DLL not recovered)"
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date = "2026-03-31"
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strings:
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$mz = { 4D 5A }
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$class = "Extension.SubRoutine" wide
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$method = "Run2" wide
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condition:
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$mz at 0 and $class and $method
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}
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// end third-party
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rule axios_2026_03: critical {
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meta:
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description = "Contains IOCs from the 2026/03/19 Axios -> plain-crypto-js compromise"
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strings:
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$artifact1 = "/Library/Caches/com.apple.act.mond"
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$artifact2 = "%PROGRAMDATA%\\wt.exe"
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$artifact3 = "/tmp/ld.py"
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$c2 = "sfrclak.com:8000/6202033"
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$domain1 = "sfrclak.com"
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$ip = "142.11.206.73"
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$url = "packages.npm.org/product2"
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condition:
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(hash.sha256(0, filesize) == "f7d335205b8d7b20208fb3ef93ee6dc817905dc3ae0c10a0b164f4e7d07121cd")
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or (hash.sha256(0, filesize) == "617b67a8e1210e4fc87c92d1d1da45a2f311c08d26e89b12307cf583c900d101")
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or (hash.sha256(0, filesize) == "92ff08773995ebc8d55ec4b8e1a225d0d1e51efa4ef88b8849d0071230c9645a")
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or (hash.sha256(0, filesize) == "fcb81618bb15edfdedfb638b4c08a2af9cac9ecfa551af135a8402bf980375cf")
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or any of them
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}

‎rules/malware/supplychain/litellm.yara‎

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// source: https://github.com/Neo23x0/signature-base/pull/394
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rule MAL_LiteLLM_SupplyChain_Mar26: critical python {
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meta:
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description = "Detects malicious indicators used in LiteLLM supply chain attack"
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author = "Marius Benthin"
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date = "2026-03-28"
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reference = "https://github.com/BerriAI/litellm/issues/24512"
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hash = "71e35aef03099cd1f2d6446734273025a163597de93912df321ef118bf135238"
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score = 80
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strings:
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$s1 = "exec(base64.b64decode("
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$s2 = "litellm." base64
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$s3 = "subprocess.DEVNULL"
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condition:
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filesize < 500KB
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and all of them
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}

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