20 lines
1.1 KiB
Text
20 lines
1.1 KiB
Text
rule Backdoor_Win_C3_1
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{
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meta:
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author = "FireEye"
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date_created = "2021-05-11"
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description = "Detection to identify the Custom Command and Control (C3) binaries."
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reference = "https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations"
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md5 = "7cdac4b82a7573ae825e5edb48f80be5"
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strings:
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$dropboxAPI = "Dropbox-API-Arg"
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$knownDLLs1 = "WINHTTP.dll" fullword
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$knownDLLs2 = "SHLWAPI.dll" fullword
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$knownDLLs3 = "NETAPI32.dll" fullword
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$knownDLLs4 = "ODBC32.dll" fullword
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$tokenString1 = { 5B 78 5D 20 65 72 72 6F 72 20 73 65 74 74 69 6E 67 20 74 6F 6B 65 6E }
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$tokenString2 = { 5B 78 5D 20 65 72 72 6F 72 20 63 72 65 61 74 69 6E 67 20 54 6F 6B 65 6E }
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$tokenString3 = { 5B 78 5D 20 65 72 72 6F 72 20 64 75 70 6C 69 63 61 74 69 6E 67 20 74 6F 6B 65 6E }
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condition:
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filesize < 5MB and uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550 and (((all of ($knownDLLs*)) and ($dropboxAPI or (1 of ($tokenString*)))) or (all of ($tokenString*)))
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}
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