{"Id":"ee6fa2de-d388-416c-862d-24385c152fad","Tags":["msr.sys"],"Verified":"TRUE","Author":"Michael Haag","Created":"2023-12-02","MitreID":"T1068","Category":"vulnerable driver","Commands":{"Command":"sc.exe create msr.sys binPath=C:\\windows\\temp\\msr.sys type=kernel && sc.exe start msr.sys","Description":"Identified on the MSFT Driver Block list, non-admin can write MSR. ","Usecase":"Elevate privileges","Privileges":"kernel","OperatingSystem":"Windows 10"},"Resources":["https://twitter.com/wdormann/status/1699878227261411699","https://learn.microsoft.com/en-us/windows/security/application-security/application-control/windows-defender-application-control/design/microsoft-recommended-driver-block-rules"],"Detection":[],"Acknowledgement":{"Person":"","Handle":""},"KnownVulnerableSamples":[{"Filename":"msr.sys","Libraries":["ntoskrnl.exe","HAL.dll"],"ImportedFunctions":["IofCompleteRequest","IoDeleteSymbolicLink","IoDeleteDevice","IoCreateSymbolicLink","KeSetSystemGroupAffinityThread","KeRevertToUserGroupAffinityThread","KeBugCheckEx","IoCreateDevice","KeGetProcessorNumberFromIndex","RtlInitUnicodeString","HalSetBusDataByOffset","HalGetBusDataByOffset"],"ExportedFunctions":"","MD5":"808d2bcad62afa82a2b4fdd0fec6d9c6","SHA1":"14c6e52e1ed19cdaac5a82da6051de89be06c334","SHA256":"ede9a3858a12d5ddea21a310e5721bf86c2248539f42c9e0c3c29ae5b0148ba5","Imphash":"ddffac000a9ce8309fadca5939bd6b19","Machine":"AMD64","MagicHeader":"50 45 0 0","CreationTimestamp":"2019-02-07 09:46:11","RichPEHeaderMD5":"d4f3dea543c7d1110de608833ff941e6","RichPEHeaderSHA1":"ca0a39ffadb3f6c0106d0be3b3f7f08a3a153dd1","RichPEHeaderSHA256":"e94f754b1eb264a935896cf00f5dd78aeb61f6e8448841eb5ee3150f1d8d85d5","AuthentihashMD5":"dc5d6e5c4884d33d8e85acbb295982b0","AuthentihashSHA1":"2146bf058139453c0447786d6f6d5fc454ab955f","AuthentihashSHA256":"1f8812611cf7120e89e769cc908fabc0c9e49b27fded8dde6a3de51d9ce34f09","Sections":{".text":{"Entropy":5.183293718914335,"Virtual Size":"0xfd"},".rdata":{"Entropy":4.194281523340796,"Virtual Size":"0x128"},".data":{"Entropy":0.5096713223407059,"Virtual Size":"0x114"},".pdata":{"Entropy":3.132230438014181,"Virtual Size":"0x60"},"PAGE":{"Entropy":5.788463310734859,"Virtual Size":"0x2e4"},"INIT":{"Entropy":5.363130494284849,"Virtual Size":"0x36e"}},"CompanyName":"","FileDescription":"","InternalName":"","OriginalFilename":"","FileVersion":"","ProductName":"","LegalCopyright":"","ProductVersion":"","Signatures":[{"CertificatesInfo":"","SignerInfo":"","Certificates":[{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Hardware Compatibility Publisher","ValidFrom":"2023-04-06 19:16:30","ValidTo":"2024-04-03 19:16:30","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":false,"SerialNumber":"3300000062f45cf99e58a96a89000000000062","Version":3,"CertificateType":"Leaf (Code Signing)","IsCodeSigning":true,"IsCA":false,"TBS":{"MD5":"93c79f426eb2f2a03b74a6275cac238f","SHA1":"e3ae60577ad97b4113d71845e11bd33a1ef2bea8","SHA256":"0f06228de7bacfbf65d426df80c4e40c5abfe5a2a402e6221dea03b18897de2b","SHA384":"4fcbd8696874577fdeed02d6f1245fb7f45d477850cbfdac0db27f478ed500665247ca122157f2678949f85e5386aa71"}},{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014","ValidFrom":"2014-10-15 20:31:27","ValidTo":"2029-10-15 20:41:27","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":true,"SerialNumber":"330000000d690d5d7893d076df00000000000d","Version":3,"CertificateType":"CA","IsCodeSigning":false,"IsCA":true,"TBS":{"MD5":"83f69422963f11c3c340b81712eef319","SHA1":"0c5e5f24590b53bc291e28583acb78e5adc95601","SHA256":"d8be9e4d9074088ef818bc6f6fb64955e90378b2754155126feebbbd969cf0ae","SHA384":"260ad59ba706420f68ba212931153bd89f760c464b21be55fba9d014fff322407859d4ebfb78ea9a3330f60dc9821a63"}}],"Signer":[{"SerialNumber":"3300000062f45cf99e58a96a89000000000062","Issuer":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014","Version":1}]}],"Authentihash":{"MD5":"dc5d6e5c4884d33d8e85acbb295982b0","SHA1":"2146bf058139453c0447786d6f6d5fc454ab955f","SHA256":"1f8812611cf7120e89e769cc908fabc0c9e49b27fded8dde6a3de51d9ce34f09"},"RichPEHeaderHash":{"MD5":"d4f3dea543c7d1110de608833ff941e6","SHA1":"ca0a39ffadb3f6c0106d0be3b3f7f08a3a153dd1","SHA256":"e94f754b1eb264a935896cf00f5dd78aeb61f6e8448841eb5ee3150f1d8d85d5"},"Description":"","Company":"","Product":"","Copyright":"","MachineType":"AMD64","Imports":["ntoskrnl.exe","HAL.dll"],"LoadsDespiteHVCI":"FALSE"},{"Filename":"msr.sys","Libraries":["ntoskrnl.exe","HAL.dll"],"ImportedFunctions":["IofCompleteRequest","IoDeleteSymbolicLink","IoDeleteDevice","KeGetProcessorNumberFromIndex","IoCreateSymbolicLink","KeRevertToUserGroupAffinityThread","ZwMapViewOfSection","ZwUnmapViewOfSection","KeBugCheckEx","DbgPrint","ZwOpenSection","IoCreateDevice","KeSetSystemGroupAffinityThread","RtlInitUnicodeString","HalSetBusDataByOffset","HalFreeHardwareCounters","HalAllocateHardwareCounters","HalGetBusDataByOffset"],"ExportedFunctions":"","MD5":"d90251456195433abcb63ff579a8dda8","SHA1":"0a02625927613c9a492a9eac3ea943ddf6f64028","SHA256":"6c6a4d07e95ab4212c2afefcb0ce37dc485fa56120b0419b636bd8bd326038c1","Imphash":"90862ed3cb06642744e5aff0d881f694","Machine":"AMD64","MagicHeader":"50 45 0 0","CreationTimestamp":"2023-03-13 08:03:45","RichPEHeaderMD5":"a9a5e090dd2f0faae708d12243a6beb2","RichPEHeaderSHA1":"89fb87aed185c809cd36b07ac5f9e7a5830925a2","RichPEHeaderSHA256":"aa3af1f1ddf9ec78ac1569ee1f30193f9636ed216fbe99e5d3f3167807749249","AuthentihashMD5":"b6bb37bc17ea29b0edac914de37518e6","AuthentihashSHA1":"381cc2b974d440edea0bbc010c4bef4cdc2169b7","AuthentihashSHA256":"d23f28169d6e5c09a89e5136a4ff899a3b6f886535bb0254a27dd00a2753c412","Sections":{".text":{"Entropy":5.020611101197345,"Virtual Size":"0x121"},".rdata":{"Entropy":4.134658643685672,"Virtual Size":"0x16c"},".data":{"Entropy":0.5096713223407059,"Virtual Size":"0x114"},".pdata":{"Entropy":3.1007767920907034,"Virtual Size":"0x60"},"PAGE":{"Entropy":6.135370120580779,"Virtual Size":"0x474"},"INIT":{"Entropy":5.4171130453837355,"Virtual Size":"0x520"}},"CompanyName":"","FileDescription":"","InternalName":"","OriginalFilename":"","FileVersion":"","ProductName":"","LegalCopyright":"","ProductVersion":"","Signatures":[{"CertificatesInfo":"","SignerInfo":"","Certificates":[{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Hardware Compatibility Publisher","ValidFrom":"2023-04-06 19:16:30","ValidTo":"2024-04-03 19:16:30","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":false,"SerialNumber":"3300000062f45cf99e58a96a89000000000062","Version":3,"CertificateType":"Leaf (Code Signing)","IsCodeSigning":true,"IsCA":false,"TBS":{"MD5":"93c79f426eb2f2a03b74a6275cac238f","SHA1":"e3ae60577ad97b4113d71845e11bd33a1ef2bea8","SHA256":"0f06228de7bacfbf65d426df80c4e40c5abfe5a2a402e6221dea03b18897de2b","SHA384":"4fcbd8696874577fdeed02d6f1245fb7f45d477850cbfdac0db27f478ed500665247ca122157f2678949f85e5386aa71"}},{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014","ValidFrom":"2014-10-15 20:31:27","ValidTo":"2029-10-15 20:41:27","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":true,"SerialNumber":"330000000d690d5d7893d076df00000000000d","Version":3,"CertificateType":"CA","IsCodeSigning":false,"IsCA":true,"TBS":{"MD5":"83f69422963f11c3c340b81712eef319","SHA1":"0c5e5f24590b53bc291e28583acb78e5adc95601","SHA256":"d8be9e4d9074088ef818bc6f6fb64955e90378b2754155126feebbbd969cf0ae","SHA384":"260ad59ba706420f68ba212931153bd89f760c464b21be55fba9d014fff322407859d4ebfb78ea9a3330f60dc9821a63"}}],"Signer":[{"SerialNumber":"3300000062f45cf99e58a96a89000000000062","Issuer":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014","Version":1}]}],"Authentihash":{"MD5":"b6bb37bc17ea29b0edac914de37518e6","SHA1":"381cc2b974d440edea0bbc010c4bef4cdc2169b7","SHA256":"d23f28169d6e5c09a89e5136a4ff899a3b6f886535bb0254a27dd00a2753c412"},"RichPEHeaderHash":{"MD5":"a9a5e090dd2f0faae708d12243a6beb2","SHA1":"89fb87aed185c809cd36b07ac5f9e7a5830925a2","SHA256":"aa3af1f1ddf9ec78ac1569ee1f30193f9636ed216fbe99e5d3f3167807749249"},"Description":"","Company":"","Product":"","Copyright":"","MachineType":"AMD64","Imports":["ntoskrnl.exe","HAL.dll"],"LoadsDespiteHVCI":"FALSE"}]}