YARA · ESET malware-ioc

ESET_IIS_Native_Module_PRIVATE

Signature to match an IIS native module (clean or malicious)

GenericESET malware-iocBSD 2-Clause LicenseCompiles with YARA-Xprivate rule

Author: ESET Research
Date: 2021-08-04
Score / Quality: 75 / 55

What this rule detects

Signature to match an IIS native module (clean or malicious)

Targets: Windows PE.

It defines 44 patterns (44 text, 0 hex, 0 regex). YARA modules used: pe.

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

iis-native-module-private.yarBSD 2-Clause License

import "pe"

private rule ESET_IIS_Native_Module_PRIVATE : FILE
{
	meta:
		description = "Signature to match an IIS native module (clean or malicious)"
		author = "ESET Research"
		id = "e3bacdc8-fde1-5e83-ac94-79fc345e888d"
		date = "2021-08-04"
		modified = "2021-08-04"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/badiis/badiis.yar#L34-L92"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "5a388dc3253df606e2648d1f9c018e6dde373bbddce66dba69b7aecdd95bac18"
		score = 75
		quality = 55
		tags = "FILE"
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$e1 = "This module subscribed to event"
		$e2 = "CHttpModule::OnBeginRequest"
		$e3 = "CHttpModule::OnPostBeginRequest"
		$e4 = "CHttpModule::OnAuthenticateRequest"
		$e5 = "CHttpModule::OnPostAuthenticateRequest"
		$e6 = "CHttpModule::OnAuthorizeRequest"
		$e7 = "CHttpModule::OnPostAuthorizeRequest"
		$e8 = "CHttpModule::OnResolveRequestCache"
		$e9 = "CHttpModule::OnPostResolveRequestCache"
		$e10 = "CHttpModule::OnMapRequestHandler"
		$e11 = "CHttpModule::OnPostMapRequestHandler"
		$e12 = "CHttpModule::OnAcquireRequestState"
		$e13 = "CHttpModule::OnPostAcquireRequestState"
		$e14 = "CHttpModule::OnPreExecuteRequestHandler"
		$e15 = "CHttpModule::OnPostPreExecuteRequestHandler"
		$e16 = "CHttpModule::OnExecuteRequestHandler"
		$e17 = "CHttpModule::OnPostExecuteRequestHandler"
		$e18 = "CHttpModule::OnReleaseRequestState"
		$e19 = "CHttpModule::OnPostReleaseRequestState"
		$e20 = "CHttpModule::OnUpdateRequestCache"
		$e21 = "CHttpModule::OnPostUpdateRequestCache"
		$e22 = "CHttpModule::OnLogRequest"
		$e23 = "CHttpModule::OnPostLogRequest"
		$e24 = "CHttpModule::OnEndRequest"
		$e25 = "CHttpModule::OnPostEndRequest"
		$e26 = "CHttpModule::OnSendResponse"
		$e27 = "CHttpModule::OnMapPath"
		$e28 = "CHttpModule::OnReadEntity"
		$e29 = "CHttpModule::OnCustomRequestNotification"
		$e30 = "CHttpModule::OnAsyncCompletion"
		$e31 = "CGlobalModule::OnGlobalStopListening"
		$e32 = "CGlobalModule::OnGlobalCacheCleanup"
		$e33 = "CGlobalModule::OnGlobalCacheOperation"
		$e34 = "CGlobalModule::OnGlobalHealthCheck"
		$e35 = "CGlobalModule::OnGlobalConfigurationChange"
		$e36 = "CGlobalModule::OnGlobalFileChange"
		$e37 = "CGlobalModule::OnGlobalApplicationStart"
		$e38 = "CGlobalModule::OnGlobalApplicationResolveModules"
		$e39 = "CGlobalModule::OnGlobalApplicationStop"
		$e40 = "CGlobalModule::OnGlobalRSCAQuery"
		$e41 = "CGlobalModule::OnGlobalTraceEvent"
		$e42 = "CGlobalModule::OnGlobalCustomNotification"
		$e43 = "CGlobalModule::OnGlobalThreadCleanup"
		$e44 = "CGlobalModule::OnGlobalApplicationPreload"

	condition:
		uint16( 0 ) == 0x5A4D and pe.exports ( "RegisterModule" ) and any of ( $e* )
}

Strings (44 patterns)

Identifier	Type	Value
$e1	text	"This module subscribed to event"
$e2	text	"CHttpModule::OnBeginRequest"
$e3	text	"CHttpModule::OnPostBeginRequest"
$e4	text	"CHttpModule::OnAuthenticateRequest"
$e5	text	"CHttpModule::OnPostAuthenticateRequest"
$e6	text	"CHttpModule::OnAuthorizeRequest"
$e7	text	"CHttpModule::OnPostAuthorizeRequest"
$e8	text	"CHttpModule::OnResolveRequestCache"
$e9	text	"CHttpModule::OnPostResolveRequestCache"
$e10	text	"CHttpModule::OnMapRequestHandler"
$e11	text	"CHttpModule::OnPostMapRequestHandler"
$e12	text	"CHttpModule::OnAcquireRequestState"
$e13	text	"CHttpModule::OnPostAcquireRequestState"
$e14	text	"CHttpModule::OnPreExecuteRequestHandler"
$e15	text	"CHttpModule::OnPostPreExecuteRequestHandler"
$e16	text	"CHttpModule::OnExecuteRequestHandler"
$e17	text	"CHttpModule::OnPostExecuteRequestHandler"
$e18	text	"CHttpModule::OnReleaseRequestState"
$e19	text	"CHttpModule::OnPostReleaseRequestState"
$e20	text	"CHttpModule::OnUpdateRequestCache"
$e21	text	"CHttpModule::OnPostUpdateRequestCache"
$e22	text	"CHttpModule::OnLogRequest"
$e23	text	"CHttpModule::OnPostLogRequest"
$e24	text	"CHttpModule::OnEndRequest"
$e25	text	"CHttpModule::OnPostEndRequest"
$e26	text	"CHttpModule::OnSendResponse"
$e27	text	"CHttpModule::OnMapPath"
$e28	text	"CHttpModule::OnReadEntity"
$e29	text	"CHttpModule::OnCustomRequestNotification"
$e30	text	"CHttpModule::OnAsyncCompletion"
$e31	text	"CGlobalModule::OnGlobalStopListening"
$e32	text	"CGlobalModule::OnGlobalCacheCleanup"
$e33	text	"CGlobalModule::OnGlobalCacheOperation"
$e34	text	"CGlobalModule::OnGlobalHealthCheck"
$e35	text	"CGlobalModule::OnGlobalConfigurationChange"
$e36	text	"CGlobalModule::OnGlobalFileChange"
$e37	text	"CGlobalModule::OnGlobalApplicationStart"
$e38	text	"CGlobalModule::OnGlobalApplicationResolveModules"
$e39	text	"CGlobalModule::OnGlobalApplicationStop"
$e40	text	"CGlobalModule::OnGlobalRSCAQuery"
$e41	text	"CGlobalModule::OnGlobalTraceEvent"
$e42	text	"CGlobalModule::OnGlobalCustomNotification"
$e43	text	"CGlobalModule::OnGlobalThreadCleanup"
$e44	text	"CGlobalModule::OnGlobalApplicationPreload"

Condition

uint16( 0 ) == 0x5A4D and pe.exports ( "RegisterModule" ) and any of ( $e* )

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
At least one pattern in ( $e* ) must match.
Uses the pe module.
Checks exported functions or the DLL name.

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References

https://github.com/eset/malware-ioc/

Licence & attribution

Author: ESET Research

Source repository: ESET malware-ioc @ 17baf44964

Licence: BSD 2-Clause License (stated in the rule's own meta)

“BSD 2-Clause”

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: e3bacdc8-fde1-5e83-ac94-79fc345e888d

Metadata

version	1

Tags:FILE

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