Elastic high stable eql
Network Activity to a Suspicious Top Level Domain
Identifies DNS queries to commonly abused Top Level Domains by common LOLBINs or executables running from world writable directories or unsigned binaries. This behavior matches on common malware C2 abusing less formal domain names.
Detection Logic
network where host.os.type == "windows" and dns.question.name != null and
(
process.name : ("MSBuild.exe", "mshta.exe", "wscript.exe", "powershell.exe", "pwsh.exe", "msiexec.exe", "rundll32.exe",
"bitsadmin.exe", "InstallUtil.exe", "python.exe", "regsvr32.exe", "dllhost.exe", "node.exe", "curl.exe",
"java.exe", "javaw.exe", "*.pif", "*.com", "*.scr") or
(?process.code_signature.trusted == false or ?process.code_signature.exists == false) or
?process.code_signature.subject_name : ("AutoIt Consulting Ltd", "OpenJS Foundation", "Python Software Foundation") or
?process.executable : (
"?:\\Users\\Public\\*.exe", "?:\\ProgramData\\*.exe", "?:\\Users\\*\\Downloads\\*.exe",
"\\Device\\HarddiskVolume*\\Users\\Public\\*.exe", "\\Device\\HarddiskVolume*\\ProgramData\\*.exe", "\\Device\\HarddiskVolume*\\Users\\*\\Downloads\\*.exe"
)
) and
dns.question.name regex """.*\.(top
| buzz
| xyz
| rest
| ml
| cf
| gq
| ga
| onion
| monster
| cyou
| quest
| cc
| bar
| cfd
| click
| cam
| surf
| tk
| shop
| club
| icu
| pw
| ws
| online
| fun
| life
| boats
| store
| hair
| skin
| motorcycles
| christmas
| lol
| makeup
| mom
| bond
| beauty
| biz
| live
| work
| zip
| country
| accountant
| date
| party
| science
| loan
| win
| men
| faith
| review
| racing
| download
| host
| zone)""" and
not process.executable : (
"?:\\ProgramData\\Microsoft\\Windows Defender\\platform\\*\\*.exe",
"\\Device\\HarddiskVolume*\\ProgramData\\Microsoft\\Windows Defender\\platform\\*\\*.exe"
) Field Validations
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