Detection rules › Kusto Query Language

Deletion of data on multiple drives using cipher exe

Source: upstream

This query checks for attempts to delete data on multiple drives using cipher.exe. This activity is typically done by ransomware to prevent recovery of data after encryption.

MITRE ATT&CK coverage

Tactic	Techniques
Impact	`T1485` Data Destruction

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.
Defender-DeviceProcessEvents	9001000	Process activity (any)

Stages and Predicates

Stage 1: `source`

DeviceProcessEvents

Stage 2: `where`

FileName eq "cipher.exe"

Stage 3: `where`

ProcessCommandLine match "/w"

Stage 4: `summarize`

Stage 5: `where`

CipherCount gt "1"

Stage 6: `extend`

Stage 7: `extend`

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
`CipherCount`	gt	`1`
`FileName`	eq	`cipher.exe`
`ProcessCommandLine`	match	`/w`

Deletion of data on multiple drives using cipher exe

MITRE ATT&CK coverage

Event coverage

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: summarize

Stage 5: where

Stage 6: extend

Stage 7: extend