LoFP LoFP / various business process or userland applications and behavior.

Techniques

Sample rules

Suspicious Process Executed From Container File

Description

The following analytic identifies a suspicious process executed from within common container/archive file types such as ZIP, ISO, IMG, and others. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process names and command-line executions. This activity is significant as it is a common technique used by adversaries to execute scripts or evade defenses. If confirmed malicious, this behavior could allow attackers to execute arbitrary code, escalate privileges, or persist within the environment, posing a significant security risk.

Detection logic


| tstats `security_content_summariesonly`
count
min(_time) as firstTime
max(_time) as lastTime
from datamodel=Endpoint.Processes
where Processes.process IN (
    "*.ZIP\\*",
    "*.ISO\\*",
    "*.IMG\\*",
    "*.CAB\\*",
    "*.TAR\\*",
    "*.GZ\\*",
    "*.RAR\\*",
    "*.7Z\\*"
    )
    AND Processes.action="allowed"
by
    Processes.action
    Processes.dest
    Processes.original_file_name
    Processes.parent_process
    Processes.parent_process_exec
    Processes.parent_process_guid
    Processes.parent_process_id
    Processes.parent_process_name
    Processes.parent_process_path
    Processes.process
    Processes.process_exec
    Processes.process_guid
    Processes.process_hash
    Processes.process_id
    Processes.process_integrity_level
    Processes.process_name
    Processes.process_path
    Processes.user
    Processes.user_id
    Processes.vendor_product

| `drop_dm_object_name(Processes)`

| regex process="(?i).*\.(zip
|iso
|img
|cab
|tar
|gz
|rar
|7z)\\\\.+\.(bat
|bin
|cab
|cmd
|com
|cpl
|ex_
|exe
|gadget
|inf1
|ins
|inx
|htm
|html
|isu
|jar
|job
|js
|jse
|lnk
|msc
|msi
|msp
|mst
|paf
|pif
|ps1
|reg
|rgs
|scr
|sct
|shb
|shs
|u3p
|vb
|vbe
|vbs
|vbscript
|ws
|wsf
|wsh)\"?$"

| rex field=process "(?i).+\\\\(?<file_name>[^\\\\]+\.(?:zip
|iso
|img
|cab
|tar
|gz
|rar
|7z))\\\\(?:.+\\\\)?(?<container_file_name>[^\\\\\"]+\.(?:bat
|bin
|cab
|cmd
|com
|cpl
|ex_
|exe
|gadget
|inf1
|ins
|inx
|htm
|html
|isu
|jar
|job
|js
|jse
|lnk
|msc
|msi
|msp
|mst
|paf
|pif
|ps1
|reg
|rgs
|scr
|sct
|shb
|shs
|u3p
|vb
|vbe
|vbs
|vbscript
|ws
|wsf
|wsh))\"?$"

| `security_content_ctime(firstTime)`

| `security_content_ctime(lastTime)`

| `suspicious_process_executed_from_container_file_filter`