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94 lines
3.4 KiB
Plaintext
94 lines
3.4 KiB
Plaintext
/*
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Yara Rule Set
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Author: Cylance
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Date: 2017-02-09
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Identifier: StreamEx Shell Crew (Cylance Report)
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*/
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/* Rule Set ----------------------------------------------------------------- */
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rule StreamEx_ShellCrew {
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meta:
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description = "Detects a "
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author = "Cylance"
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reference = "https://blog.cylance.com/shell-crew-variants-continue-to-fly-under-big-avs-radar"
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date = "2017-02-09"
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score = 80
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strings:
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$a = "0r+8DQY97XGB5iZ4Vf3KsEt61HLoTOuIqJPp2AlncRCgSxUWyebhMdmzvFjNwka="
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$b = {34 ?? 88 04 11 48 63 C3 48 FF C1 48 3D D8 03 00 00}
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$bb = {81 86 ?? ?? 00 10 34 ?? 88 86 ?? ?? 00 10 46 81 FE D8 03 00 00}
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$c = "greendll"
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$d = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36" wide
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$f = {26 5E 25 24 23 91 91 91 91}
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$g = "D:\\pdb\\ht_d6.pdb"
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condition:
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$a or $b or $bb or ($c and $d) or $f or $g
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}
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/*
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Yara Rule Set
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Author: Florian Roth
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Date: 2017-02-10
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Identifier: ShellCrew StreamEx
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*/
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/* Rule Set ----------------------------------------------------------------- */
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rule ShellCrew_StreamEx_1 {
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meta:
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description = "Auto-generated rule - file 81f411415aefa5ad7f7ed2365d9a18d0faf33738617afc19215b69c23f212c07"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://blog.cylance.com/shell-crew-variants-continue-to-fly-under-big-avs-radar"
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date = "2017-02-10"
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hash1 = "81f411415aefa5ad7f7ed2365d9a18d0faf33738617afc19215b69c23f212c07"
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strings:
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$x1 = "cmd.exe /c \"%s\"" fullword wide
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$s3 = "uac\\bin\\install_test.pdb" fullword ascii
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$s5 = "uncompress error:%d %s" fullword ascii
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$s7 = "%s\\AdobeBak\\Proc.dat" fullword wide
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$s8 = "e:\\workspace\\boar" fullword ascii
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$s12 = "$\\data.ini" fullword wide
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condition:
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( uint16(0) == 0x5a4d and filesize < 1000KB and 4 of them )
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}
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rule ShellCrew_StreamEx_1_msi {
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meta:
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description = "Auto-generated rule - file msi.dll"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://blog.cylance.com/shell-crew-variants-continue-to-fly-under-big-avs-radar"
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date = "2017-02-10"
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hash1 = "8c9048e2f5ea2ef9516cac06dc0fba8a7e97754468c0d9dc1e5f7bce6dbda2cc"
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strings:
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$x1 = "msi.dll.eng" fullword wide
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$s2 = "ahinovx" fullword ascii
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$s3 = "jkpsxy47CDEMNSTYbhinqrwx56" fullword ascii
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$s4 = "PVYdejmrsy12" fullword ascii
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$s6 = "FLMTUZaijkpsxy45CD" fullword ascii
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$s7 = "afhopqvw34ABIJOPTYZehmo" fullword ascii
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condition:
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( uint16(0) == 0x5a4d and filesize < 20KB and 3 of them )
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}
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rule ShellCrew_StreamEx_1_msi_dll {
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meta:
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description = "Auto-generated rule - file msi.dll.eng"
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license = "https://creativecommons.org/licenses/by-nc/4.0/"
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author = "Florian Roth"
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reference = "https://blog.cylance.com/shell-crew-variants-continue-to-fly-under-big-avs-radar"
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date = "2017-02-10"
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hash1 = "883108119d2f4db066fa82e37aa49ecd2dbdacda67eb936b96720663ed6565ce"
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hash2 = "5311f862d7c824d13eea8293422211e94fb406d95af0ae51358accd4835aaef8"
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hash3 = "191cbeffa36657ab1ef3939da023cacbc9de0285bbe7775069c3d6e18b372c3f"
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strings:
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$s1 = "NDOGDUA" fullword ascii
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$s2 = "NsrdsrN" fullword ascii
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condition:
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( uint16(0) == 0x4d9d and filesize < 300KB and all of them )
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}
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