suspicious_curl_usage

rule suspicious_curl_usage {
 meta:
    author = "Emir Erdogan"
    description = "cURL is a command line browser, and often used by attackers to download malware.  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/NTrME73OyT8w"
    version = "0.01"
    created = "2021-03-09"
    product = "windows"
    service = "sysmon"
    mitre = "T1059, T1188, T1079, T1041"

  events:
($selection.target.process.file.full_path = "C:\\Windows\\System32\\curl.exe" and $selection.principal.process.file.full_path = "C:\\Windows\\System32\\cmd.exe" and (re.regex($selection.target.process.command_line, `.*curl ftp.*`) or re.regex($selection.target.process.command_line, `.*curl --socks5 torproxy.*`) or re.regex($selection.target.process.command_line, `.*curl -F .*\.exe.*`) or re.regex($selection.target.process.command_line, `.*curl --dns-ipv4-addr.*`) or re.regex($selection.target.process.command_line, `.*curl --dns-interface eth1.*`) or re.regex($selection.target.process.command_line, `.*curl --resolve.*`) or re.regex($selection.target.process.command_line, `.*curl --header \"X-Application: BotClient\".*`)))

  condition:
    $selection
}