iertutil.dll

File Path: C:\Windows\system32\iertutil.dll
Description: Run time utility for Internet Explorer

Hashes

Type	Hash
MD5	`F0367DE97CFA284889266C521144670F`
SHA1	`913FC012981D2BEBA1CD039AA0B8F1580CCFB379`
SHA256	`7D80927EC6FA8CF98BE6BFDC50C8C9DE221DF452E1144D6BF91F9EFA74264B77`
SHA384	`29C9633D51BE5CF08E01D8BDB15B08944191373CC4DAAD4319B3A45E167EA561ADB962104ECFEEDEC907941E8C675AC2`
SHA512	`4A2DAEA2A52C334FA673EC0448642D59BCF67237779A30FF28A59F6BDD5BB8E92D34EF7418C491335827C111DB3404AB95A548DFC108868BDF59977BB9BF9A5F`
SSDEEP	`24576:vEOh5bMDJ7U1uXt56kNIfg3iJapoyDBU7NnPbwY34neqJ7oaK6X:vd5gJ+UE0Mbf4lJ7oaK6`
IMP	`B852FEA8B6523C4DCD675F6BB00E682C`
PESHA1	`C0A1C9DEDD7E2EEE57E52A1B33ADD4541D3ED69F`
PE256	`F701E823108AC92EE74FAA2FBD92F4A1FB1D24546CF6046927AF701D3F5945AF`

DLL Exports:

Function Name	Ordinal	Type
`IUriBuilderInternalCreateDomain`	103	Exported Function
`IsStringProperty`	185	Exported Function
`OutOfProcessExceptionEventDebuggerLaunchCallback`	105	Exported Function
`OutOfProcessExceptionEventCallback`	104	Exported Function
`IsDWORDProperty`	184	Exported Function
`IEGetTabWindowExports`	47	Exported Function
`IEGetProcessModule`	31	Exported Function
`IntlPercentEncodeNormalize`	183	Exported Function
`ImpersonateUser`	182	Exported Function
`OutOfProcessExceptionEventSignatureCallback`	106	Exported Function
`RetiredOrdinal`	900	Exported Function
`ResetIERegistrySettings`	109	Exported Function
`UriFromHostAndScheme`	113	Exported Function
`RevertImpersonate`	189	Exported Function
`ResetIEExtensibility`	108	Exported Function
`PrivateCoInternetCombineIUri`	187	Exported Function
`PrivateCoInternetCanonicalizeIUri`	186	Exported Function
`ResetIDNLanguageData`	107	Exported Function
`PrivateCoInternetParseIUri`	188	Exported Function
`IEGetFrameUtilExports`	27	Exported Function
`DllCanUnloadNow`	119	Exported Function
`CreateUriWithFragment`	118	Exported Function
`DllGetClassObject`	121	Exported Function
`DllGetActivationFactory`	120	Exported Function
`CreateUriPriv`	117	Exported Function
`CreateStringHashN`	22	Exported Function
`CreateIUriBuilder`	114	Exported Function
`CreateUriFromMultiByteString`	116	Exported Function
`CreateUri`	115	Exported Function
`FastMimeGetFileExtension`	122	Exported Function
`GetPortFromUrlScheme`	179	Exported Function
`GetIUriPriv2`	145	Exported Function
`GetPropertyName`	181	Exported Function
`GetPropertyFromName`	180	Exported Function
`GetIUriPriv`	136	Exported Function
`FastMimeLookupKnownType`	132	Exported Function
`FastMimeGetIsMimeFilterEnabled`	131	Exported Function
`GetIDNSettingsForIE`	23	Exported Function
`FastMimeSetIsMimeFilterEnabled`	133	Exported Function

Signature

Status: Signature verified.
Serial: 3300000266BD1580EFA75CD6D3000000000266
Thumbprint: A4341B9FD50FB9964283220A36A1EF6F6FAA7840
Issuer: CN=Microsoft Windows Production PCA 2011, O=Microsoft Corporation, L=Redmond, S=Washington, C=US
Subject: CN=Microsoft Windows, O=Microsoft Corporation, L=Redmond, S=Washington, C=US

File Metadata

Original Filename: IeRtUtil.dll.mui
Product Name: Internet Explorer
Company Name: Microsoft Corporation
File Version: 11.00.19041.1 (WinBuild.160101.0800)
Product Version: 11.00.19041.1
Language: English (United States)
Legal Copyright: Microsoft Corporation. All rights reserved.
Machine Type: 64-bit

File Scan

VirusTotal Detections: 0/69
VirusTotal Link: https://www.virustotal.com/gui/file/7d80927ec6fa8cf98be6bfdc50c8c9de221df452e1144d6bf91f9efa74264b77/detection/

Possible Misuse

The following table contains possible examples of iertutil.dll being misused. While iertutil.dll is not inherently malicious, its legitimate functionality can be abused for malicious purposes.

Source	Source File	Example	License
sigma	win_dcom_iertutil_dll_hijack.yml	`title: T1021 DCOM InternetExplorer.Application Iertutil DLL Hijack`	DRL 1.0
sigma	win_dcom_iertutil_dll_hijack.yml	`description: Detects a threat actor creating a file named` iertutil.dll `in the` C:\Program Files\Internet Explorer` directory over the network for a DCOM InternetExplorer DLL Hijack scenario.`{:.highlight .language-yaml}	DRL 1.0
sigma	win_dcom_iertutil_dll_hijack.yml	`RelativeTargetName\\|endswith: '\Internet Explorer\iertutil.dll'`	DRL 1.0
sigma	sysmon_dcom_iertutil_dll_hijack.yml	`title: T1021 DCOM InternetExplorer.Application Iertutil DLL Hijack`	DRL 1.0
sigma	sysmon_dcom_iertutil_dll_hijack.yml	`description: Detects a threat actor creating a file named` iertutil.dll `in the` C:\Program Files\Internet Explorer` directory over the network and loading it for a DCOM InternetExplorer DLL Hijack scenario.`{:.highlight .language-yaml}	DRL 1.0
sigma	sysmon_dcom_iertutil_dll_hijack.yml	`TargetFilename\\|endswith: '\Internet Explorer\iertutil.dll'`	DRL 1.0
sigma	sysmon_dcom_iertutil_dll_hijack.yml	`ImageLoaded\\|endswith: '\Internet Explorer\iertutil.dll'`	DRL 1.0