Compress Data and Lock With Password for Exfiltration With WINZIP

Severity: medium
Author: frack113
Source: upstream

An adversary may compress or encrypt data that is collected prior to exfiltration using 3rd party utilities

MITRE ATT&CK coverage

Tactic	Techniques
Collection	`T1560.001` Archive Collected Data: Archive via Utility

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `all of selection_winzip`

or:
CommandLine|contains: winzip.exe
CommandLine|contains: winzip64.exe

Stage 2: `all of selection_password`

CommandLine|contains: '-s"'

Stage 3: `all of selection_other`

or:
CommandLine|contains: ' -a '
CommandLine|contains: ' -min '

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`-a` corpus 4 (sigma 4) `-min` `-s"` `winzip.exe` `winzip64.exe`