{"Id":"c1265ee4-aed4-4e65-ac54-c64deb5e3b28","Tags":["fur.sys"],"Verified":"TRUE","Author":"Guus Verbeek","Created":"2023-05-07","MitreID":"T1068","Category":"malicious","Commands":{"Command":"sc.exe create fur.sys binPath=C:\\windows\\temp\\fur.sys type=kernel && sc.exe start fur.sys","Description":"SophosLabs has discovered that threat actors are using a new driver loader called BURNTCIGAR to install a malicious driver signed with Microsoft.","OperatingSystem":"Windows 10","Privileges":"kernel","Usecase":"Elevate privileges"},"Resources":["https://www.mandiant.com/resources/blog/hunting-attestation-signed-malware, https://news.sophos.com/en-us/2022/12/13/signed-driver-malware-moves-up-the-software-trust-chain/"],"Detection":[],"Acknowledgement":{"Handle":"","Person":""},"KnownVulnerableSamples":[{"Authentihash":{"MD5":"5c23bab622d6bbabd23d29b4adaa4ae0","SHA1":"9fbb6f9a22d1c676ff1b97a33d4c5e94f18aca5f","SHA256":"aab97fb324c883f1de71112e1d9fb716cef40636e39a3b9f4a5b8678cf7bde3f"},"Company":"","Copyright":"","CreationTimestamp":"2022-09-15 00:24:03","Date":"","Description":"","ExportedFunctions":"","FileVersion":"","Filename":"","ImportedFunctions":["ObQueryNameString","FltUnregisterFilter","WskRegister","WdfVersionBind","ExAllocatePool","NtQuerySystemInformation","ExFreePoolWithTag","IoAllocateMdl","MmProbeAndLockPages","MmMapLockedPagesSpecifyCache","MmUnlockPages","IoFreeMdl","KeQueryActiveProcessors","KeSetSystemAffinityThread","KeRevertToUserAffinityThread","DbgPrint","KeQueryPerformanceCounter"],"Imports":["ntoskrnl.exe","FLTMGR.SYS","NETIO.SYS","WDFLDR.SYS","ntoskrnl.exe","HAL.dll"],"InternalName":"","MD5":"6a066d2be83cf83f343d0550b0b8f206","MachineType":"AMD64","MagicHeader":"50 45 0 0","OriginalFilename":"","Product":"","ProductVersion":"","Publisher":"","RichPEHeaderHash":{"MD5":"ffdf660eb1ebf020a1d0a55a90712dfb","SHA1":"3e905e3d061d0d59de61fcf39c994fcb0ec1bab3","SHA256":"2b3f99a94b7a7132854be769e27b331419c53989ef42f686d6f5ba09ddefefd6"},"SHA1":"8e126f4f35e228fdd3aa78d533225db7122d8945","SHA256":"0d10c4b2f56364b475b60bd2933273c8b1ed2176353e59e65f968c61e93b7d99","Sections":{".text":{"Entropy":0,"Virtual Size":"0x37fc5"},".rdata":{"Entropy":0,"Virtual Size":"0x1db4"},".data":{"Entropy":0,"Virtual Size":"0x43c8"},".pdata":{"Entropy":0,"Virtual Size":"0x10a4"},"PAGE":{"Entropy":0,"Virtual Size":"0x13"},"INIT":{"Entropy":0,"Virtual Size":"0xdde"},".73h0":{"Entropy":0,"Virtual Size":"0x1b36a5"},".73h1":{"Entropy":0.5261478929039797,"Virtual Size":"0x4b8"},".73h2":{"Entropy":7.781889548207141,"Virtual Size":"0x30ee44"},".reloc":{"Entropy":3.799240213996674,"Virtual Size":"0xc8"}},"Signature":"","Signatures":[{"CertificatesInfo":"","SignerInfo":"","Certificates":[{"Subject":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Hardware Compatibility Publisher","ValidFrom":"2022-06-07 18:08:06","ValidTo":"2023-06-01 18:08:06","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.11","IsCertificateAuthority":false,"SerialNumber":"3300000057ee4d659a923e7c10000000000057","Version":3,"CertificateType":"Leaf (Code Signing)","IsCodeSigning":true,"IsCA":false,"TBS":{"MD5":"fdc11a5676aed4e9cc0c09eeb7450dfb","SHA1":"4902077d9a05d4231b791d3b05bafa4a79132f03","SHA256":"5db56c23d83bf67c7152e28ad4a684a7372b4ae4f52afe7a81ce91eef94caec3","SHA384":"c952d7f0e0ea5216ce4400601fb7c0829f0f3fcd6eb2b5b9112fbe45d133e00c4abd660f8e1794f7ac4ef95123e2c0ab"}},{"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":"3300000057ee4d659a923e7c10000000000057","Issuer":"C=US, ST=Washington, L=Redmond, O=Microsoft Corporation, CN=Microsoft Windows Third Party Component CA 2014","Version":1}]}],"Imphash":"28dc68bb6d6bf4f6b2db8dd7588b2511","LoadsDespiteHVCI":"FALSE"}]}