{"Id":"d827f7a6-1832-4ddb-90dd-7a8cf1c7f25e","Tags":["LcTkA.sys"],"Verified":"TRUE","Author":"Michael Haag","Created":"2023-03-04","MitreID":"T1068","Category":"malicious","Commands":{"Command":"sc.exe create LcTkA.sys binPath=C:\\windows\\temp\\LcTkA.sys type=kernel && sc.exe start LcTkA.sys","Description":"SentinelOne has observed prominent threat actors abusing legitimately signed Microsoft drivers in active intrusions into telecommunication, BPO, MSSP, and financial services businesses.\nInvestigations into these intrusions led to the discovery of POORTRY and STONESTOP malware, part of a small toolkit designed to terminate AV and EDR processes.\nWe first reported our discovery to Microsoft’s Security Response Center (MSRC) in October 2022 and received an official case number (75361). Today, MSRC released an associated advisory under ADV220005.\nThis research is being released alongside Mandiant, a SentinelOne technology and incident response partner. ","OperatingSystem":"Windows 10","Privileges":"kernel","Usecase":"Elevate privileges"},"Resources":["https://www.sentinelone.com/labs/driving-through-defenses-targeted-attacks-leverage-signed-malicious-microsoft-drivers/",""],"Detection":[],"Acknowledgement":{"Handle":"","Person":""},"KnownVulnerableSamples":[{"Authentihash":{"MD5":"b663d79a688800d84065ccc2809874b7","SHA1":"46a9d9e9904ba5f4c011ad69d0795969c721c662","SHA256":"675329ef7a63a7c58d3daa6cb5c6e299143decec7a149c36a6bfe204bbf0407e"},"Company":"","Copyright":"","CreationTimestamp":"2022-10-02 15:48:02","Date":"","Description":"","ExportedFunctions":"","FileVersion":"","Filename":"LcTkA.sys","ImportedFunctions":["KeInitializeEvent","HalReturnToFirmware","ExAllocatePool","NtQuerySystemInformation","ExFreePoolWithTag","IoAllocateMdl","MmProbeAndLockPages","MmMapLockedPagesSpecifyCache","MmUnlockPages","IoFreeMdl","KeQueryActiveProcessors","KeSetSystemAffinityThread","KeRevertToUserAffinityThread","DbgPrint","KeQueryPerformanceCounter"],"Imports":["ntoskrnl.exe","HAL.dll","ntoskrnl.exe","HAL.dll"],"InternalName":"","MD5":"909f3fc221acbe999483c87d9ead024a","MachineType":"AMD64","MagicHeader":"50 45 0 0","OriginalFilename":"","Product":"","ProductVersion":"","Publisher":"","RichPEHeaderHash":{"MD5":"ffdf660eb1ebf020a1d0a55a90712dfb","SHA1":"3e905e3d061d0d59de61fcf39c994fcb0ec1bab3","SHA256":"2b3f99a94b7a7132854be769e27b331419c53989ef42f686d6f5ba09ddefefd6"},"SHA1":"b2f955b3e6107f831ebe67997f8586d4fe9f3e98","SHA256":"c8f9e1ad7b8cce62fba349a00bc168c849d42cfb2ca5b2c6cc4b51d054e0c497","Sections":{".text":{"Entropy":0,"Virtual Size":"0x266e"},".rdata":{"Entropy":0,"Virtual Size":"0x68c"},".data":{"Entropy":0,"Virtual Size":"0x78"},".pdata":{"Entropy":0,"Virtual Size":"0x18c"},"INIT":{"Entropy":0,"Virtual Size":"0x550"},".\"!b":{"Entropy":0,"Virtual Size":"0x14e2da"},".t{f":{"Entropy":0.8144190015462619,"Virtual Size":"0x280"},".Kl$":{"Entropy":7.704385920634162,"Virtual Size":"0x2968c0"},".reloc":{"Entropy":3.7856601791711784,"Virtual Size":"0xc4"}},"Signature":["Microsoft Windows Hardware Compatibility Publisher","Microsoft Windows Third Party Component CA 2014","Microsoft Root Certificate Authority 2010"],"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":"96b5c33b31f27b6ba11f59dd742c3764b1bca093f9f33347e9f95df21d89f4579ee33f10a3595018053b142941b6a70e5b81a2ccbd8442c1c4bed184c2c4bd0c8c47bcbd8886fb5a0896ae2c2fdfbf9366a32b20ca848a6945273f732332936a23e9fffdd918edceffbd6b41738d579cf8b46d499805e6a335a9f07e6e86c06ba8086725afc0998cdba7064d4093188ba959e69914b912178144ac57c3ae8eae947bcb3b8edd7ab4715bba2bc3c7d085234b371277a54a2f7f1ab763b94459ed9230cce47c099212111f52f51e0291a4d7d7e58f8047ff189b7fd19c0671dcf376197790d52a0fbc6c12c4c50c2066f50e2f5093d8cafb7fe556ed09d8a753b1c72a6978dcf05fe74b20b6af63b5e1b15c804e9c7aa91d4df72846782106954d32dd6042e4b61ac4f24636de357302c1b5e55fb92b59457a9243d7c4e963dd368f76c728caa8441be8321a66cde5485c4a0a602b469206609698dcd933d721777f886dac4772daa2466eab64682bd24e98fb35cc7fec3f136d11e5db77edc1c37e1f6a4a14f8b4a721c671866770cdd819a35d1fa09b9a7cc55d4d728e74077fa74d00fcdd682412772a557527cda92c1d8e7c19ee692c9f7425338208db38cc7cc74f6c3a6bc237117872fe55596460333e2edfc42de72cd7fb0a82256fb8d70c84a5e1c4746e2a95329ea0fecdb4188fd33bad32b2b19ab86d0543fbff0d0f","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":"ce10082e1aa4c1c2bd953b4a7208e56a","LoadsDespiteHVCI":"FALSE"}]}