YARA · ESET malware-ioc

ESET_IIS_Group10

Detects Group 10 native IIS malware family

MalwareESET malware-iocBSD 2-Clause LicenseCompiles with YARA-X

Author: ESET Research
Date: 2021-08-04
Score / Quality: 75 / 80

What this rule detects

Detects Group 10 native IIS malware family

It defines 18 patterns (18 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 and 1 rule(s) it depends on needed to compile it on its own.

iis-group10.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* )
}

rule ESET_IIS_Group10
{
	meta:
		description = "Detects Group 10 native IIS malware family"
		author = "ESET Research"
		id = "31368b38-9128-594d-888d-e97d3edc7a1f"
		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#L389-L423"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "48701168d7da726222227ef757f1a4005a49c0bf300123319ce03db09445b3ef"
		score = 75
		quality = 80
		tags = ""
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$s1 = "IIS7.dll"
		$s2 = "<title>(.*?)title(.*?)>"
		$s3 = "<meta(.*?)name(.*?)=(.*?)keywords(.*?)>"
		$s4 = "<meta(.*?)name(.*?)=(.*?)description(.*?)>"
		$s5 = "js.breakavs.co"
		$s6 = "&#24494;&#20449;&#32676;&#45;&#36187;&#36710;&#80;&#75;&#49;&#48;&#32676;&#12304;&#36827;&#32676;&#24494;&#20449;&#102;&#117;&#110;&#53;&#55;&#54;&#52;&#52;&#12305;&#95;&#24184;&#36816;&#39134;&#33351;&#95;&#24184;&#36816;&#50;&#56;&#32676;"
		$s7 = "&#21271;&#20140;&#36187;&#36710;&#24494;&#20449;&#32676;&#44;&#21271;&#20140;&#24494;&#20449;&#36187;&#36710;&#32676;&#44;&#21271;&#20140;&#36187;&#36710;&#24494;&#20449;&#32676;&#44;&#80;&#75;&#49;&#48;&#32676;&#44;&#21271;&#20140;&#36187;&#36710;&#112;&#107;&#49;&#48;&#24494;&#20449;&#32676;&#44;&#80;&#75;&#49;&#48;&#24494;&#20449;&#32676;&#44;&#36187;&#36710;&#24494;&#20449;&#32676;&#44;&#21271;&#20140;&#36187;&#36710;&#32676;&#44;"
		$s8 = "&#21271;&#20140;&#36187;&#36710;&#24494;&#20449;&#32676;&#44;&#21271;&#20140;&#24494;&#20449;&#36187;&#36710;&#32676;&#12304;&#36827;&#32676;&#24494;&#20449;&#21495;&#102;&#117;&#110;&#53;&#55;&#54;&#52;&#52;&#12305;&#21271;&#20140;&#24494;&#20449;&#36187;&#36710;&#32676;&#44;&#21271;&#20140;&#24494;&#20449;&#36187;&#36710;"
		$e1 = "Baiduspider"
		$e2 = "Sosospider"
		$e3 = "Sogou web spider"
		$e4 = "360Spider"
		$e5 = "YisouSpider"
		$e6 = "sogou.com"
		$e7 = "soso.com"
		$e8 = "uc.cn"
		$e9 = "baidu.com"
		$e10 = "sm.cn"

	condition:
		ESET_IIS_Native_Module_PRIVATE and 2 of ( $e* ) and 3 of ( $s* )
}

Strings (18 patterns)

Identifier	Type	Value
$s1	text	"IIS7.dll"
$s2	text	"<title>(.?)title(.?)>"
$s3	text	"<meta(.?)name(.?)=(.?)keywords(.?)>"
$s4	text	"<meta(.?)name(.?)=(.?)description(.?)>"
$s5	text	"js.breakavs.co"
$s6	text	"微信群-赛车PK10群【进群微信fun57644&#1 …
$s7	text	"北京赛车微信群,北京微信赛车群,北京赛车&#244 …
$s8	text	"北京赛车微信群,北京微信赛车群【进群微信&# …
$e1	text	"Baiduspider"
$e2	text	"Sosospider"
$e3	text	"Sogou web spider"
$e4	text	"360Spider"
$e5	text	"YisouSpider"
$e6	text	"sogou.com"
$e7	text	"soso.com"
$e8	text	"uc.cn"
$e9	text	"baidu.com"
$e10	text	"sm.cn"

Condition

ESET_IIS_Native_Module_PRIVATE and 2 of ( $e* ) and 3 of ( $s* )

In plain words (Heuristic)

At least 2 patterns in ( $e* ) must match.
At least 3 patterns in ( $s* ) must match.
Depends on the rule ESET_IIS_Native_Module_PRIVATE.

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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: 31368b38-9128-594d-888d-e97d3edc7a1f

Metadata

version	1

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