rspamd/conf/scores.d/mime_types_group.conf

# Mime types rules scores
#
# Please don't modify this file as your changes might be overwritten with
# the next update.
#
# You can modify '$LOCAL_CONFDIR/rspamd.conf.local.override' to redefine
# parameters defined on the top level
#
# You can modify '$LOCAL_CONFDIR/rspamd.conf.local' to add
# parameters defined on the top level
#
# For specific modules or configuration you can also modify
# '$LOCAL_CONFDIR/local.d/file.conf' - to add your options or rewrite defaults
# '$LOCAL_CONFDIR/override.d/file.conf' - to override the defaults
#
# See https://rspamd.com/doc/tutorials/writing_rules.html for details

description = "Mime attachments rules";
# Define some limit for this group
max_score = 10.0;


symbols = {
    "MIME_GOOD" {
        weight = -0.1;
        description = "Known content-type";
        one_shot = true;
    }
    "MIME_BAD" {
        weight = 1.0;
        description = "Known bad content-type";
        one_shot = true;
    }
    "MIME_UNKNOWN" {
        weight = 0.1;
        description = "Missing or unknown content-type";
        one_shot = true;
    }
    "MIME_BAD_ATTACHMENT" {
        weight = 4.0;
        description = "Invalid attachment mime type";
        one_shot = true;
    }
    "MIME_ENCRYPTED_ARCHIVE" {
        weight = 2.0;
        description = "Encrypted archive in a message";
        one_shot = true;
    }
    "MIME_OBFUSCATED_ARCHIVE" {
        weight = 8.0;
        description = "Archive has files with clear obfuscation signs";
        one_shot = true;
    }
    "MIME_EXE_IN_GEN_SPLIT_RAR" {
        weight = 5.0;
        description = "EXE file in RAR archive with generic split extension (e.g. .001)";
        one_shot = true;
    }
    "MIME_ARCHIVE_IN_ARCHIVE" {
        weight = 5.0;
        description = "Archive within another archive";
        one_shot = true;
    }
    "MIME_DOUBLE_BAD_EXTENSION" {
        weight = 3.0; # This rule has dynamic weight up to 4.0
        description = "Bad extension cloaking";
        one_shot = true;
    }
    "MIME_BAD_EXTENSION" {
        weight = 2.0; # This rule has dynamic weight up to 4.0
        description = "Bad extension";
        one_shot = true;
    }
    "MIME_BAD_UNICODE" {
        weight = 8.0;
        description = "Filename with known obscured unicode characters";
        one_shot = true;
    }
}