{"Id":"636d30fd-2b95-4dc2-a413-be0e43d1482c","Author":"Michael Haag","Created":"2025-10-09","MitreID":"T1068","Category":"malicious","Verified":"TRUE","Commands":{"Command":"sc.exe create changsha binPath=C:\\windows\\temp\\changsha.sys type=kernel && sc.exe start changsha","Description":"Malicious rootkit masquerading as legitimate CrowdStrike Falcon Sensor driver (CSAgent.sys). Signed with stolen/expired Chinese certificate from 2015. Detected by 61.6% of AV engines as Rootkit.Win64.Agent and Trojan:Win64/AVTamper. Used to establish kernel-level persistence while evading detection by impersonating trusted security software.","Usecase":"Elevate privileges","Privileges":"kernel","OperatingSystem":"Windows 10"},"Resources":["https://www.virustotal.com/gui/file/06eccd102c9105957773b32538943531d9c39d0a504ceb3b9b155e97e3b0b134"],"Acknowledgement":{"Person":"","Handle":""},"Detection":[],"KnownVulnerableSamples":[{"Filename":"changsha.sys","MD5":"808568a7dbff8a982fbffec4a827eb4d","SHA1":"21a9ca6028992828c9c360d752cb033603a2fd93","SHA256":"06eccd102c9105957773b32538943531d9c39d0a504ceb3b9b155e97e3b0b134","Filesize":2187776,"Signature":"","Date":"","Publisher":"","Company":"CrowdStrike, Inc.","Description":"CrowdStrike Falcon Sensor Driver","Product":"CrowdStrike Falcon Sensor","ProductVersion":"6.34.14806.0","FileVersion":"6.34.14806.0","MachineType":"AMD64","OriginalFilename":"CSAgent.sys","InternalName":"CSAgent.sys","Copyright":"(c) CrowdStrike, Inc. All rights reserved.","Imports":["FLTMGR.SYS","ntoskrnl.exe","HAL.dll","ntoskrnl.exe","HAL.dll"],"ExportedFunctions":"","ImportedFunctions":["FltGetVolumeInformation","wcscat_s","HalReturnToFirmware","ExAllocatePool","NtQuerySystemInformation","ExFreePoolWithTag","IoAllocateMdl","MmProbeAndLockPages","MmMapLockedPagesSpecifyCache","MmUnlockPages","IoFreeMdl","KeQueryActiveProcessors","KeSetSystemAffinityThread","KeRevertToUserAffinityThread","DbgPrint","KeQueryPerformanceCounter"],"PDBPath":"","Authentihash":{"MD5":"a23891cdabc468d641005cb4e1dbea71","SHA1":"4d5fc3b8c73a83fe255680fbd9bd5effb3d897e6","SHA256":"aa65f8fcbaad575284db8f3f55958145a5548de0d9682bf9ac6e5d8c98efe000"},"Imphash":"7ab33df355e966e61729c7fae3a29564","RichPEHeaderHash":{"MD5":"ffdf660eb1ebf020a1d0a55a90712dfb","SHA1":"3e905e3d061d0d59de61fcf39c994fcb0ec1bab3","SHA256":"2b3f99a94b7a7132854be769e27b331419c53989ef42f686d6f5ba09ddefefd6"},"Sections":{".text":{"Entropy":0,"Virtual Size":"0xf622"},".rdata":{"Entropy":0,"Virtual Size":"0xd08"},".data":{"Entropy":0,"Virtual Size":"0x308"},".pdata":{"Entropy":0,"Virtual Size":"0x540"},"INIT":{"Entropy":0,"Virtual Size":"0xd20"},".Kd^":{"Entropy":0,"Virtual Size":"0x1077d4"},".-rl":{"Entropy":0.5191971708046649,"Virtual Size":"0x488"},".oXz":{"Entropy":7.777214701045453,"Virtual Size":"0x213d30"},".reloc":{"Entropy":3.6308295307050766,"Virtual Size":"0x68"},".rsrc":{"Entropy":3.3860055915938143,"Virtual Size":"0x3a8"}},"MagicHeader":"50 45 0 0","CreationTimestamp":"2024-11-09 07:33:54","Signatures":[{"CertificatesInfo":"","SignerInfo":"","Certificates":[{"Subject":"CN=长沙恒祥信息技术有限公司,O=长沙恒祥信息技术有限公司,L=长沙市,ST=湖南省,C=CN","ValidFrom":"2015-03-20 00:00:00","ValidTo":"2016-03-19 23:59:59","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.5","IsCertificateAuthority":false,"SerialNumber":"75e8e7b9043b13df60e76499663021c1","Version":3,"CertificateType":"Leaf (Code Signing)","IsCodeSigning":true,"IsCA":false,"TBS":{"MD5":"c744e90982da6083d0d56173dba4c9fa","SHA1":"633b38d9372b85e02e013beca47cf5b1b7b10bee","SHA256":"09a47ae5b166910e92028c035d2550ccec79b4c9b221bc476380ddb69b5b4770","SHA384":"240cbfa8fdb38172da35d1f761200717e8824a6eb58cf2be0421e825fc7ddf5c62a93136a6f844af06d2c5779d80841a"}},{"Subject":"CN=VeriSign Class 3 Public Primary Certification Authority , G5,OU=(c) 2006 VeriSign, Inc. , For authorized use only,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US","ValidFrom":"2011-02-22 19:25:17","ValidTo":"2021-02-22 19:35:17","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.5","IsCertificateAuthority":true,"SerialNumber":"611993e400000000001c","Version":3,"CertificateType":"CA","IsCodeSigning":false,"IsCA":true,"TBS":{"MD5":"78a717e082dcc1cda3458d917e677d14","SHA1":"4a872e0e51f9b304469cd1dedb496ee9b8b983a4","SHA256":"317fa1d234ebc49040ebc5e8746f8997471496051b185a91bdd9dfbb23fab5f8","SHA384":"b71052da4eb9157c8c1a5d7f55df19d69b9128598b72fcca608e5b7cc7d64c43c5504b9c86355a6dc22ee40c88cc385c"}},{"Subject":"CN=VeriSign Class 3 Code Signing 2010 CA,OU=Terms of use at https://www.verisign.com/rpa (c)10,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US","ValidFrom":"2010-02-08 00:00:00","ValidTo":"2020-02-07 23:59:59","Signature":"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","SignatureAlgorithmOID":"1.2.840.113549.1.1.5","IsCertificateAuthority":true,"SerialNumber":"5200e5aa2556fc1a86ed96c9d44b33c7","Version":3,"CertificateType":"CA","IsCodeSigning":true,"IsCA":true,"TBS":{"MD5":"b30c31a572b0409383ed3fbe17e56e81","SHA1":"4843a82ed3b1f2bfbee9671960e1940c942f688d","SHA256":"03cda47a6e654ed85d932714fc09ce4874600eda29ec6628cfbaeb155cab78c9","SHA384":"bbda8407c4f9fc4e54d772f1c7fb9d30bc97e1f97ecd51c443063d1fa0644e266328781776cd5c44896c457c75f4d7da"}}],"Signer":[{"SerialNumber":"75e8e7b9043b13df60e76499663021c1","Issuer":"CN=VeriSign Class 3 Code Signing 2010 CA,OU=Terms of use at https://www.verisign.com/rpa (c)10,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US","Version":1}]}]}],"Tags":["changsha"]}