Yara rule with uint32be not allowed by clamAV provided by cPanel

Hi! I want to use this yara rule to disable the reception of office files with macros rule Office_as_MHTML { meta: description = "Detects an Microsoft Office saved as a MHTML file (false positives are possible but rare; many matches on CVE-2012-0158)" license = "https://creativecommons.org/licenses/by-nc/4.0/" author = "Florian Roth" date = "2015-05-28" score = 40 reference = "https://www.trustwave.com/Resources/SpiderLabs-Blog/Malicious-Macros-Evades-Detection-by-Using-Unusual-File-Format/" hash1 = "8391d6992bc037a891d2e91fd474b91bd821fe6cb9cfc62d1ee9a013b18eca80" hash2 = "1ff3573fe995f35e70597c75d163bdd9bed86e2238867b328ccca2a5906c4eef" hash3 = "d44a76120a505a9655f0224c6660932120ef2b72fee4642bab62ede136499590" hash4 = "5b8019d339907ab948a413d2be4bdb3e5fdabb320f5edc726dc60b4c70e74c84" strings: $s1 = "Content-Transfer-Encoding: base64" ascii fullword $s2 = "Content-Type: application/x-mso" ascii fullword $x1 = "QWN0aXZlTWltZQA" ascii // Base64 encoded 'ActiveMime' $x2 = "0M8R4KGxGuE" ascii // Base64 encoded office header D0CF11E0A1B11AE1.. condition: uint32be(0) == 0x4d494d45 // "MIME" header and all of ($s*) and 1 of ($x*) }
The problem it's the yara parser on the clamAV package provided by cPanel doesn't accepts the variable type uint32be I use it in another machines running ubuntu and debian with previous versions of clamAv and it works perfectly. So I don't know if clamAV removed the support of that variable type or it's a problem with the compilation of yara into the clamAV package provided by cPanel.