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豊田孝の「IT談話館」 Windowsメモリダンプ解析を依頼する WinDbgとシステム分析



　本「IT談話館」一般公開記事は、10年以上の実務経験を持つ上級Windowsエンジニアを想定しています。
　本館は、Windowsカーネル深層を解析し、クラッシュ原因をはじめとするシステム内の「異様な動き」を検出・分析する
超高度な技術と実績を保有しています。


Windows 10 Active Memory DumpとDLL解析(応用)


　本「IT談話館」の「一般公開記事」は、「Active Memory Dump とカーネルメモリダンプ」の解析結果を基に起草されています。「本館」主筆の「豊田孝」はDKOM(Direct Kernel Object Manipulation)ベースの解析手法の第一人者であり、Windowsカーネル空間の解析分野では世界の先頭を走っています。

　現在、セキュリティー問題を無視することはできません。Microsoft社側の負担だけではなく、同社製品の利用者側の負担も増しています。困ったことではありますが、当面避けられません。セキュリティーの視点から「Windows10ソフトウェアセンサー」を見た場合、本「IT談話館」の確認範囲では、「カーネル層保護ロジック」に加え、次のような保護メカニズム階層が考案・実装されています。下記リンクはすべて本館記事を指しています。
  1. Silo/Server Silo
  2. Job
  3. Session
  4. Protected Process
  5. Mandatory Integrity Control(MIC)
  6. Windows API(+CPU)
  7. CPU
　本稿では、「Windows 10 Active Memory DumpとDLL解析(基礎)」に引き続き、Windows 10システムから導入されたActive Memory Dumpを解析し、上記の「Windows API(+CPU)」に関連するアプリケーション（プロセス）とライブラリ（DLL）の関係を解析します。今回の作業で使用する本館の独自解析コードは、次のような機能を実装し、最新OS環境で採取された「Windows 10 Active Memory Dumpとカーネルメモリダンプ」の解析にも無修正で適応できます。なお、解析コードの開発知識の習得には、「時間と予算の投資」が必要です。 　本稿で解析対象とするActive Memory Dumpは次のようなものです。 
0: kd> vertarget
Windows 10 Kernel Version 18362 MP (2 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 18362.1.amd64fre.19h1_release.190318-1202
Machine Name:
Kernel base = 0xfffff804`59a00000 PsLoadedModuleList = 0xfffff804`59e480b0
Debug session time: Sun Nov  3 09:56:47.110 2019 (UTC + 9:00)
System Uptime: 0 days 1:42:54.949
　このダンプの採取時にはGoogle社のChromeが動作中でしたから、ここでは、Chrome関連プロセスに関する情報を解析します。ChromeはSandboxベースで複数のインスタンスを起動しています。インスタンスの中にはすでに役割終え、動作を終了しているものあります。動作終了済みのインスタンスは解析できませんから、まずは、このあたりのシステム概要を把握し、本格的な解析作業を始める前の準備を整えます。 
Started..
	-0xFFFFC489270130C0	ProL->00	Peb->0x00000046b3b11000	VmDelete->1	SelfDelete->0	chrome.exe
+0xFFFFC48924B9A080	ProL->00	Peb->0x0000007194d17000	VmDelete->0	SelfDelete->0	chrome.exe
+0xFFFFC489267EE080	ProL->00	Peb->0x00000063d361e000	VmDelete->0	SelfDelete->0	chrome.exe
+0xFFFFC48924BF5080	ProL->00	Peb->0x00000002c0ce7000	VmDelete->0	SelfDelete->0	chrome.exe
+0xFFFFC48925830080	ProL->00	Peb->0x00000083aa7a7000	VmDelete->0	SelfDelete->0	chrome.exe
+0xFFFFC48925CCE080	ProL->00	Peb->0x000000ba99a14000	VmDelete->0	SelfDelete->0	chrome.exe
	-0xFFFFC489250EC080	ProL->00	Peb->0x0000007de87b9000	VmDelete->1	SelfDelete->0	chrome.exe
	-0xFFFFC48925437080	ProL->00	Peb->0x000000eff40ae000	VmDelete->1	SelfDelete->0	chrome.exe
	-0xFFFFC489264E1080	ProL->00	Peb->0x000000536f069000	VmDelete->1	SelfDelete->1	chrome.exe
	-0xFFFFC48920B72080	ProL->00	Peb->0x00000061df82c000	VmDelete->1	SelfDelete->1	chrome.exe
+0xFFFFC48926DEB080	ProL->00	Peb->0x0000003ff7c47000	VmDelete->0	SelfDelete->0	chrome.exe
Ended..
　この情報では、2ヶ所のデータが赤色で表示されています。2番目の赤色表示のChromeプロセス「0xFFFFC489250EC080」の割り当てられていたVM（仮想メモリ）はすでに削除されていますから、今回の解析対象プロセスからは除外することになります。第1の赤色表示プロセス「0xFFFFC48924B9A080」のVMは削除されていません。解析対象情報がメモリに残っていることになりますから、本稿ではこのプロセスが依存しているDLL群の情報を解析することにします。

　本館の独自解析コードを実行すると、次のような結果が返されてきます。 

+0xFFFFC48924B9A080	chrome.exe	Peb->0x0000007194d17000
	+000	Base:0x00007ff6e2c40000	Parent->0x0000000000000000	LdR->04	Flags->0x000022cc	chrome.exe
	+001	Base:0x00007ff880740000	Parent->0x0000000000000000	LdR->00	Flags->0x0000a2c4	ntdll.dll
	+002	Base:0x00007ff87fbe0000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	KERNEL32.DLL
	+003	Base:0x00007ff87dfa0000	Parent->0x00007ff87fbe0000	LdR->00	Flags->0x0008a2cc	KERNELBASE.dll
	+004	Base:0x00007ff870dc0000	Parent->0x00007ff6e2c40000	LdR->00	Flags->0x100822ec	chrome_elf.dll
	+005	Base:0x00007ff876fb0000	Parent->0x00007ff6e2c40000	LdR->00	Flags->0x0008a2ec	VERSION.dll
	+006	Base:0x00007ff8803f0000	Parent->0x00007ff876fb0000	LdR->00	Flags->0x0008a2ec	msvcrt.dll
	+007	Base:0x00007ff87fac0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	ADVAPI32.dll
	+008	Base:0x00007ff8805e0000	Parent->0x00007ff87fac0000	LdR->00	Flags->0x000ca2cc	sechost.dll
	+009	Base:0x00007ff87fdf0000	Parent->0x00007ff8805e0000	LdR->00	Flags->0x0008a2cc	RPCRT4.dll
	+010	Base:0x00007ff87d050000	Parent->0x00007ff87fac0000	LdR->02	Flags->0x0008a2cc	CRYPTBASE.DLL
	+011	Base:0x00007ff87e770000	Parent->0x00007ff87d050000	LdR->00	Flags->0x000ca2cc	bcryptPrimitives.dll
	+012	Base:0x00007ff871520000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	WINMM.dll
	+013	Base:0x00007ff8714e0000	Parent->0x00007ff871520000	LdR->00	Flags->0x000ca2cc	WINMMBASE.dll
	+014	Base:0x00007ff87d7a0000	Parent->0x00007ff8714e0000	LdR->00	Flags->0x000ca2cc	cfgmgr32.dll
	+015	Base:0x00007ff87e470000	Parent->0x00007ff87d7a0000	LdR->00	Flags->0x0008a2cc	ucrtbase.dll
	+016	Base:0x00007ff87edb0000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	user32.dll
	+017	Base:0x00007ff87d7f0000	Parent->0x00007ff87edb0000	LdR->00	Flags->0x0008a2cc	win32u.dll
	+018	Base:0x00007ff880500000	Parent->0x00007ff87edb0000	LdR->00	Flags->0x000ca2cc	GDI32.dll
	+019	Base:0x00007ff87e570000	Parent->0x00007ff880500000	LdR->00	Flags->0x000ca2cc	gdi32full.dll
	+020	Base:0x00007ff87e250000	Parent->0x00007ff87e570000	LdR->00	Flags->0x000ca2cc	msvcp_win.dll
	+021	Base:0x00007ff8803c0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	IMM32.DLL
	+022	Base:0x00007ff87f3d0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	SHELL32.dll
	+023	Base:0x00007ff8802b0000	Parent->0x00007ff87f3d0000	LdR->00	Flags->0x0008a2cc	shcore.dll
	+024	Base:0x00007ff87ff70000	Parent->0x00007ff8802b0000	LdR->00	Flags->0x0008a2cc	combase.dll
	+025	Base:0x00007ff87d820000	Parent->0x00007ff87f3d0000	LdR->00	Flags->0x0008a2cc	windows.storage.dll
	+026	Base:0x00007ff87d640000	Parent->0x00007ff87d820000	LdR->00	Flags->0x000ca2cc	profapi.dll
	+027	Base:0x00007ff87d680000	Parent->0x00007ff87d820000	LdR->00	Flags->0x000ca2cc	powrprof.dll
	+028	Base:0x00007ff87d610000	Parent->0x00007ff87d680000	LdR->00	Flags->0x0008a2cc	UMPDC.dll
	+029	Base:0x00007ff87fb70000	Parent->0x00007ff87d820000	LdR->00	Flags->0x0008a2cc	shlwapi.dll
	+030	Base:0x00007ff87d620000	Parent->0x00007ff87d820000	LdR->00	Flags->0x0008a2cc	kernel.appcore.dll
	+031	Base:0x00007ff87d780000	Parent->0x00007ff87f3d0000	LdR->00	Flags->0x000ca2cc	cryptsp.dll
	+032	Base:0x00007ff854a50000	Parent->0x0000000000000000	LdR->04	Flags->0x000822cc	chrome.dll
	+033	Base:0x00007ff87b970000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	uxtheme.dll
	+034	Base:0x00007ff87d500000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	USERENV.dll
	+035	Base:0x00007ff87c240000	Parent->0x00007ff87dfa0000	LdR->03	Flags->0x0008a2cc	gpapi.dll
	+036	Base:0x00007ff8782c0000	Parent->0x00007ff8802b0000	LdR->03	Flags->0x000ca2cc	wkscli.dll
	+037	Base:0x00007ff87e440000	Parent->0x00007ff8782c0000	LdR->00	Flags->0x000ca2cc	bcrypt.dll
	+038	Base:0x00007ff87cbd0000	Parent->0x00007ff8802b0000	LdR->03	Flags->0x000ca2cc	netutils.dll
	+039	Base:0x00007ff87fca0000	Parent->0x00007ff8803c0000	LdR->03	Flags->0x0008a2cc	MSCTF.dll
	+040	Base:0x00007ff87e7f0000	Parent->0x00007ff87fca0000	LdR->00	Flags->0x0008a2cc	OLEAUT32.dll
	+041	Base:0x00007ff87ec50000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	ole32.dll
	+042	Base:0x00007ff875760000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	Secur32.dll
	+043	Base:0x00007ff87d530000	Parent->0x00007ff875760000	LdR->02	Flags->0x000ca2cc	SSPICLI.DLL
	+044	Base:0x00007ff86b710000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	DWrite.dll
	+045	Base:0x00007ff87eb10000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	WS2_32.dll
	+046	Base:0x00007ff8692f0000	Parent->0x0000000000000000	LdR->04	Flags->0x1008a2cc	COMCTL32.dll
	+047	Base:0x00007ff880530000	Parent->0x00007ff87ff70000	LdR->03	Flags->0x000ca2cc	clbcatq.dll
	+048	Base:0x00007ff87ba40000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	twinapi.appcore.dll
	+049	Base:0x00007ff87bf50000	Parent->0x00007ff87ba40000	LdR->00	Flags->0x0008a2cc	RMCLIENT.dll
	+050	Base:0x00007ff868000000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	twinapi.dll
	+051	Base:0x00007ff879330000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	NLAapi.dll
	+052	Base:0x00007ff87cb90000	Parent->0x00007ff879330000	LdR->00	Flags->0x000ca2cc	IPHLPAPI.DLL
	+053	Base:0x00007ff87fde0000	Parent->0x00007ff87cb90000	LdR->03	Flags->0x000ca2cc	NSI.dll
	+054	Base:0x00007ff878c00000	Parent->0x00007ff87cb90000	LdR->03	Flags->0x000ca2cc	dhcpcsvc6.DLL
	+055	Base:0x00007ff878be0000	Parent->0x00007ff87cb90000	LdR->03	Flags->0x000ca2cc	dhcpcsvc.DLL
	+056	Base:0x00007ff87cbe0000	Parent->0x00007ff87cb90000	LdR->03	Flags->0x000ca2cc	DNSAPI.dll
	+057	Base:0x00007ff86e0d0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imjptip.dll
	+058	Base:0x00007ff8768e0000	Parent->0x00007ff86e0d0000	LdR->00	Flags->0x0008a2cc	iertutil.dll
	+059	Base:0x00007ff8734b0000	Parent->0x00007ff86e0d0000	LdR->00	Flags->0x000ca2cc	OLEACC.dll
	+060	Base:0x00007ff879a20000	Parent->0x00007ff86e0d0000	LdR->00	Flags->0x000ca2cc	PROPSYS.dll
	+061	Base:0x00007ff87c650000	Parent->0x00007ff87fac0000	LdR->03	Flags->0x000ca2cc	ntmarta.dll
	+062	Base:0x00007ff86dce0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imjpapi.dll
	+063	Base:0x00007ff87e2f0000	Parent->0x00007ff86dce0000	LdR->00	Flags->0x0008a2cc	CRYPT32.dll
	+064	Base:0x00007ff87d660000	Parent->0x00007ff87e2f0000	LdR->00	Flags->0x000ca2cc	MSASN1.dll
	+065	Base:0x00007ff875b30000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imjkapi.dll
	+066	Base:0x00007ff878d80000	Parent->0x00007ff86dce0000	LdR->03	Flags->0x0008a2cc	policymanager.dll
	+067	Base:0x00007ff878cf0000	Parent->0x00007ff878d80000	LdR->00	Flags->0x0008a2cc	msvcp110_win.dll
	+068	Base:0x00007ff872af0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imjppred.dll
	+069	Base:0x00007ff87a090000	Parent->0x00007ff872af0000	LdR->00	Flags->0x000ca2cc	Cabinet.dll
	+070	Base:0x00007ff86dba0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imetip.dll
	+071	Base:0x00007ff86d9e0000	Parent->0x00007ff86dba0000	LdR->00	Flags->0x0008a2cc	DUI70.dll
	+072	Base:0x00007ff86d020000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imecfm.dll
	+073	Base:0x00007ff87be70000	Parent->0x00007ff86d020000	LdR->00	Flags->0x000ca2cc	wer.dll
	+074	Base:0x00007ff879b10000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	mscms.dll
	+075	Base:0x00007ff8799f0000	Parent->0x00007ff879b10000	LdR->00	Flags->0x0008a2cc	ColorAdapterClient.dll
	+076	Base:0x00007ff86fa30000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	Windows.UI.dll
	+077	Base:0x00007ff872850000	Parent->0x00007ff86fa30000	LdR->00	Flags->0x0008a2cc	TextInputFramework.dll
	+078	Base:0x00007ff86f910000	Parent->0x00007ff86fa30000	LdR->00	Flags->0x0008a2cc	InputHost.dll
	+079	Base:0x00007ff873620000	Parent->0x00007ff872850000	LdR->00	Flags->0x0008a2cc	CoreUIComponents.dll
	+080	Base:0x00007ff87b440000	Parent->0x00007ff872850000	LdR->00	Flags->0x0008a2cc	CoreMessaging.dll
	+081	Base:0x00007ff8776f0000	Parent->0x00007ff86f910000	LdR->00	Flags->0x0008a2cc	wintypes.dll
	+082	Base:0x00007ff879de0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	WTSAPI32.dll
	+083	Base:0x00007ff87c6c0000	Parent->0x00007ff879de0000	LdR->03	Flags->0x000ca2cc	WINSTA.dll
	+084	Base:0x00007ff877d10000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	MMDevApi.dll
	+085	Base:0x00007ff87d410000	Parent->0x00007ff877d10000	LdR->00	Flags->0x000ca2cc	DEVOBJ.dll
	+086	Base:0x00007ff876da0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	WINHTTP.dll
	+087	Base:0x00007ff87c500000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	FirewallAPI.dll
	+088	Base:0x00007ff87c210000	Parent->0x00007ff87c500000	LdR->03	Flags->0x0008a2cc	fwbase.dll
	+089	Base:0x00007ff87ca30000	Parent->0x00007ff87e2f0000	LdR->03	Flags->0x000ca2cc	DPAPI.dll
	+090	Base:0x00007ff876750000	Parent->0x00007ff87f3d0000	LdR->03	Flags->0x000ca2cc	LINKINFO.dll
	+091	Base:0x00007ff872160000	Parent->0x00007ff87c500000	LdR->03	Flags->0x0008a2cc	FWPolicyIOMgr.dll
	+092	Base:0x00007ff86e4d0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	MsSpellCheckingFacility.dll
	+093	Base:0x00007ff873b60000	Parent->0x00007ff86e4d0000	LdR->00	Flags->0x0008a2cc	Bcp47Langs.dll
	+094	Base:0x00007ff86fb90000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	OneCoreUAPCommonProxyStub.dll
	+095	Base:0x00007ff86f040000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	dataexchange.dll
	+096	Base:0x00007ff87ad80000	Parent->0x00007ff86f040000	LdR->00	Flags->0x000ca2cc	d3d11.dll
	+097	Base:0x00007ff87aba0000	Parent->0x00007ff86f040000	LdR->00	Flags->0x0008a2cc	dcomp.dll
	+098	Base:0x00007ff87c320000	Parent->0x00007ff87ad80000	LdR->00	Flags->0x000ca2cc	dxgi.dll
	+099	Base:0x00007ff87c290000	Parent->0x00007ff880500000	LdR->01	Flags->0x000ca2cc	dxcore.dll
	+100	Base:0x00007ff84d940000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	Windows.Media.dll
	+101	Base:0x00007ff862f00000	Parent->0x00007ff84d940000	LdR->00	Flags->0x0008a2cc	RTWorkQ.DLL
	+102	Base:0x00007ff875550000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	atlthunk.dll
	+103	Base:0x00007ff860f50000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	directmanipulation.dll
	+104	Base:0x00007ff87bd90000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	dwmapi.dll
	+105	Base:0x00007ff86c3b0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	explorerframe.dll
	+106	Base:0x00007ff875a80000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	imesearchdll.dll
	+107	Base:0x00007ff867050000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	wpnapps.dll
	+108	Base:0x00007ff877e20000	Parent->0x00007ff867050000	LdR->00	Flags->0x0008a2cc	XmlLite.dll
	+109	Base:0x00007ff877a60000	Parent->0x00007ff867050000	LdR->03	Flags->0x0008a2cc	usermgrcli.dll
	+110	Base:0x00007ff87ce80000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	mswsock.dll
	+111	Base:0x00007ff871e80000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	wbemprox.dll
	+112	Base:0x00007ff875460000	Parent->0x00007ff871e80000	LdR->00	Flags->0x000ca2cc	wbemcomn.dll
	+113	Base:0x00007ff8782e0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	wlanapi.dll
	+114	Base:0x00007ff871a90000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	wbemsvc.dll
	+115	Base:0x00007ff871b50000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	fastprox.dll
	+116	Base:0x00007ff870d20000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	amsi.dll
	+117	Base:0x00007ff870c20000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	MpOav.dll
	+118	Base:0x00007ff871970000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	wmiutils.dll
	+119	Base:0x00007ff8767a0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	WmiPerfInst.dll
	+120	Base:0x00007ff879820000	Parent->0x00007ff8767a0000	LdR->00	Flags->0x000ca2cc	pdh.dll
	+121	Base:0x00007ff866070000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	Windows.Devices.Bluetooth.dll
	+122	Base:0x00007ff86ee90000	Parent->0x00007ff866070000	LdR->00	Flags->0x0008a2cc	Windows.Networking.HostName.dll
	+123	Base:0x00007ff85a780000	Parent->0x00007ff866070000	LdR->00	Flags->0x0008a2cc	Windows.Networking.dll
	+124	Base:0x00007ff864de0000	Parent->0x00007ff866070000	LdR->00	Flags->0x0008a2cc	BiWinrt.dll
	+125	Base:0x00007ff86a780000	Parent->0x00007ff85a780000	LdR->00	Flags->0x0008a2cc	Windows.Networking.Connectivity.dll
	+126	Base:0x00007ff8654f0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	Windows.Devices.Enumeration.dll
	+127	Base:0x00007ff87a1d0000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	Windows.Devices.Radios.dll
	+128	Base:0x00007ff878680000	Parent->0x0000000000000000	LdR->04	Flags->0x000ca2cc	NETAPI32.dll
	+129	Base:0x00007ff876fc0000	Parent->0x00007ff878680000	LdR->02	Flags->0x000ca2cc	SAMCLI.DLL
	+130	Base:0x00007ff876d30000	Parent->0x00007ff876fc0000	LdR->03	Flags->0x000ca2cc	SAMLIB.dll
	+131	Base:0x00007ff875800000	Parent->0x0000000000000000	LdR->04	Flags->0x0008a2cc	webauthn.dll
	+132	Base:0x00007ff86f080000	Parent->0x0000000000000000	LdR->04	Flags->0x000822cc	psmachine_64.dll
Ended..
　かなりの情報量が返されています。実務解析を進める場合には、解析目的に応じて、DLLのPEフォーマット情報、DLL間の親子関係、DLLロードの理由、あるいは、微妙に異なるFlags値などを基に事実を確認しながら、いろいろな角度からデータ分析を行うことになります。この作業は創造的であり、かつ、たいへん魅力的なものです。次の出力情報は、Flags値に着目し、標準的な値を除外した結果です。 
+0xFFFFC48924B9A080	chrome.exe	Peb->0x0000007194d17000
	+000	Base:0x00007ff6e2c40000	Parent->0x0000000000000000	LdR->04	Flags->0x000022cc	chrome.exe
	+001	Base:0x00007ff880740000	Parent->0x0000000000000000	LdR->00	Flags->0x0000a2c4	ntdll.dll
	+004	Base:0x00007ff870dc0000	Parent->0x00007ff6e2c40000	LdR->00	Flags->0x100822ec	chrome_elf.dll
	+005	Base:0x00007ff876fb0000	Parent->0x00007ff6e2c40000	LdR->00	Flags->0x0008a2ec	VERSION.dll
	+006	Base:0x00007ff8803f0000	Parent->0x00007ff876fb0000	LdR->00	Flags->0x0008a2ec	msvcrt.dll
	+032	Base:0x00007ff854a50000	Parent->0x0000000000000000	LdR->04	Flags->0x000822cc	chrome.dll
	+046	Base:0x00007ff8692f0000	Parent->0x0000000000000000	LdR->04	Flags->0x1008a2cc	COMCTL32.dll
	+132	Base:0x00007ff86f080000	Parent->0x0000000000000000	LdR->04	Flags->0x000822cc	psmachine_64.dll
Ended..
　2つのDLLが赤色で表示されています。これらのDLLのFlags値の8桁目を見ると、構成ファイル内の情報を基に動的に切り替えロードされています。インターネットを検索してみると、「chrome_elf.dll」に関する障害報告が結構あります。Flags値は「0x100822ec」となっており、下2桁目の「e」は静的インポートを示し、このDLLが存在しない、あるいは、改ざんされているなどの問題を抱えている場合には、Chromeは動作を開始できなかったり、異様な動きになるでしょう。「COMCTL32.dll」も同じように切り替えロードが発生していますが、Flags値「0x1008a2cc」の下4桁目の「a」はこのDLLが次のようにガードされていることを示しています。 
4160  DLL characteristics
            High entropy VA supported
            Dynamic base
            NX compatible
            Guard
　「COMCTL32.dll」は改ざんへの不安は軽減されますが、構成ファイルの設定ミスには注意が必要になります。一方、「chrome_elf.dll」にはこのGuardは設定されていませんから、構成ファイルの設定ミスに加え、第3者による改ざんへの不安が残ります。

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本日は2024-11-23です。