{"Id":"89643454-e38b-41cb-853d-abf649a104a5","Tags":["DCRCVDrv.sys"],"Verified":"TRUE","Author":"Jose Hernandez","Created":"2026-08-27","MitreID":"T1068","CVE":[""],"Category":"vulnerable driver","Commands":{"Command":"","Description":"DCRCVDrv.sys exposes IOCTL 0x2205C0 to request kernel-mode process termination for a caller-supplied PID. The handler requires at least four input bytes and reaches ZwTerminateProcess through a process-handle acquisition helper. Access requires the driver to be loaded and its device to be accessible; successful termination of protected processes is not established. Abused by the Cruciferra MaaS loader, which writes the driver to C:\\Windows\\Temp\\DCRCVDrv.sys, creates a service for it, and opens a handle via the symbolic link \\\\.\\DCRCVDRV_U to kill AV/EDR processes.","OperatingSystem":"Windows","Privileges":"kernel","Usecase":"Terminate AV/EDR processes from kernel mode (BYOVD)"},"Resources":["https://www.esentire.com/blog/malware-as-a-service-cocktail-errtraffic-and-cruciferra-killing-your-edr-since-2025","https://github.com/magicsword-io/LOLDrivers/issues/412","https://www.elastic.co/security-labs/threat-command/dll-search-order-hijacking-elastic-defend","https://github.com/DeathShotXD/0xCr0ssCrush/blob/main/docs/dcrcv-analysis.md"],"Detection":[{"type":"","value":""}],"Acknowledgement":{"Handle":"@eSentire_TRU, @0xDeathShotXD","Person":"eSentire Threat Response Unit (TRU), DeathShotXD"},"KnownVulnerableSamples":[{"Filename":"DCRCVDrv.sys","MD5":"567c158ee0858f8e941d4ab7a6c18dbc","SHA1":"47d922b0fd5d704025d14ef98ded46e74830a423","SHA256":"87e8d39db624f37d3e77aedf487a2dfd197f71a4730ea74f4e7a4341deaec2ff","Signature":["Microsoft Windows Hardware Compatibility Publisher"],"Imphash":"3be3ab07a4108143e8c2d10beeaa1788","Authentihash":{"MD5":"d6f560a8e5f5476a632e83814ded5a7f","SHA1":"5b129c6f9669f1b33a42b9c0d5c970d5b4925bf6","SHA256":"2a7ed8d0be70e0667aa14e161ae1dc6b7daaeb1438b534d73b1093c0b44d78a2"},"RichPEHeaderHash":{"MD5":"bc65325e8b3839fa906e179124755b07","SHA1":"ed0e7b8ec6ed7bb3b100a17a9b4cad6ed59a7de0","SHA256":"e159e3a544aad40e47177ad1944598d8b621ab9333b226f59dfe1736bf3ea0c1"},"Sections":{".text":{"Entropy":6.382556518950604,"Virtual Size":"0x1c6a7"},".rdata":{"Entropy":5.015492178765635,"Virtual Size":"0x11a4"},".data":{"Entropy":0.5578716016060967,"Virtual Size":"0x8220"},".pdata":{"Entropy":5.072837753781875,"Virtual Size":"0xe1c"},"INIT":{"Entropy":5.278748055168351,"Virtual Size":"0xb86"},".rsrc":{"Entropy":3.295461349688772,"Virtual Size":"0x360"},".reloc":{"Entropy":1.2248474438670764,"Virtual Size":"0x84"}},"MagicHeader":"50 45 0 0","CreationTimestamp":"2022-12-15 20:19:37","Description":"DCRCV_U Driver (for SCM)","Company":"MOCOMSYS & DCRC","InternalName":"DCRCVDrv.sys","OriginalFilename":"DCRCVDrv.sys","FileVersion":"1, 0, 0, 0","Product":"DCRCV_U","ProductVersion":"1, 0, 0, 0","Copyright":"Copyright (C) MOCOMSYS & DCRC","MachineType":"AMD64","Imports":["ntoskrnl.exe","TDI.SYS","FLTMGR.SYS"],"ExportedFunctions":"","ImportedFunctions":["PsLookupProcessByProcessId","ZwQuerySymbolicLinkObject","IoGetRelatedDeviceObject","RtlInitUnicodeString","IoDeleteDevice","ExpInterlockedPushEntrySList","MmGetSystemRoutineAddress","ExpInterlockedPopEntrySList","ZwOpenSymbolicLinkObject","IoAllocateErrorLogEntry","ObQueryNameString","strncpy","IoFileObjectType","ZwCreateFile","wcsrchr","IoGetCurrentProcess","ExEventObjectType","ZwClose","ExQueryDepthSList","ObReferenceObjectByHandle","IoAttachDeviceToDeviceStack","PsGetVersion","ZwOpenProcess","ObfReferenceObject","ObfDereferenceObject","IoCreateDevice","ZwTerminateProcess","ObOpenObjectByPointer","DbgPrint","ExDeleteNPagedLookasideList","IoUnregisterFsRegistrationChange","IoRegisterFsRegistrationChange","IoDeleteSymbolicLink","IoIs32bitProcess","IofCompleteRequest","IoCreateSymbolicLink","_wcsicmp","PsSetLoadImageNotifyRoutine","_wcsnicmp","KeSetEvent","PsSetCreateThreadNotifyRoutine","ExInitializeNPagedLookasideList","PsSetCreateProcessNotifyRoutine","KeAcquireSpinLockRaiseToDpc","PsGetCurrentProcessId","ExReleaseFastMutex","ExAcquireFastMutex","KeInitializeEvent","KeWaitForSingleObject","ZwFsControlFile","wcsncpy","ZwSetInformationFile","wcsstr","ZwQueryDirectoryFile","ZwOpenFile","ZwQueryInformationFile","ZwReadFile","ZwQuerySecurityObject","ZwWriteFile","ZwCreateKey","ZwSetValueKey","ZwDeleteKey","ZwEnumerateKey","ZwOpenKey","IoDetachDevice","ZwQueryValueKey","PoStartNextPowerIrp","PoCallDriver","RtlCompareMemory","IofCallDriver","MmBuildMdlForNonPagedPool","IoFreeMdl","IoFreeIrp","IoAttachDevice","IoAllocateIrp","IoAllocateMdl","ZwEnumerateValueKey","ExGetPreviousMode","PsProcessType","KeBugCheckEx","IoWriteErrorLogEntry","ExFreePoolWithTag","ExAllocatePoolWithTag","_strnicmp","_stricmp","KeReleaseSpinLock","ZwOpenEvent","RtlAnsiCharToUnicodeChar","__C_specific_handler","TdiMapUserRequest","FltSetCallbackDataDirty","FltStartFiltering","FltRegisterFilter","FltGetVolumeName"],"Signatures":[{"CertificatesInfo":"","SignerInfo":"","Certificates":[{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Hardware Compatibility Publisher","ValidFrom":"2022-03-10 19:58:05","ValidTo":"2023-03-08 19:58:05","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":false,"SerialNumber":"33000000dc341a520fbbcf3d8c0000000000dc","Version":3,"CertificateType":"Leaf (Code Signing)","IsCodeSigning":true,"IsCA":false,"TBS":{"MD5":"a3320406647f4541c4f8e731342ced04","SHA1":"73f33ada4ceacbc289cffac339cdb36a01773a23","SHA256":"4e21391a41bf00d507b1ec6ea2a71fe57c28b022ec0c504b19f9e608c6b2acb5","SHA384":"e7f40fafff666298c5154ba64cdd1060454547233fb1d8a7982d4927d46e6e4038a40e581f33963401d6553f3ab97499"}},{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2012","ValidFrom":"2012-04-18 23:48:38","ValidTo":"2027-04-18 23:58:38","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":true,"SerialNumber":"610baac1000000000009","Version":3,"CertificateType":"CA","IsCodeSigning":false,"IsCA":true,"TBS":{"MD5":"a569061297e8e824767dbc3184a69bea","SHA1":"adbb26a587a8f44b4fccaecb306f980d1c55a150","SHA256":"cec1afd0e310c55c1dcc601ab8e172917706aa32fb5eaf826813547fdf02dd46","SHA384":"e947cac936803f5683196e4ff1b259096073395d0b908522ddce90d57597c9f7b57f7ddcdbe021ba863d843c340da8ba"}}],"Signer":[{"SerialNumber":"33000000dc341a520fbbcf3d8c0000000000dc","Issuer":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2012","Version":1}]}]}]}