covid19_themed_malware_via_chm_file

rule covid19_themed_malware_via_chm_file {
 meta:
    author = "Emir Erdogan"
    description = "rundll32 downloads covid-19 malware over chm file  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/n0COmCxxqXD5"
    version = "0.01"
    created = "2021-03-09"
    product = "windows"
    service = "sysmon"
    mitre = "T1059, T1204, T1012"

  events:
(($selection1.target.process.file.full_path = "C:\\Windows\\System32\\cmd.exe" and $selection1.principal.process.file.full_path = "C:\\Windows\\hh.exe" and re.regex($selection1.target.process.command_line, `.*for %i in \(.*\.chm\) do \(hh -decompile %temp% %~i\)&&cmd /c %temp%/~tmp6\.cab`)) or ($selection1.principal.process.file.full_path = "C:\\Windows\\System32\\cmd.exe" and $selection1.target.process.file.full_path = "C:\\Windows\\hh.exe" and re.regex($selection1.target.process.command_line, `hh -decompile .*COVID-19\.chm.*`)))

  condition:
    $selection1
}