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Detection rules › Sigma

PCRE.NET Package Temp Files

Status
test
Severity
high
Log source
category file_event, product windows
Author
Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
Source
github.com/SigmaHQ/sigma

Detects processes creating temp files related to PCRE.NET package

MITRE ATT&CK coverage

TacticTechniques
Execution

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 11: FileCreate

Rule body

title: PCRE.NET Package Temp Files
id: 6e90ae7a-7cd3-473f-a035-4ebb72d961da
status: test
description: Detects processes creating temp files related to PCRE.NET package
references:
    - https://twitter.com/rbmaslen/status/1321859647091970051
    - https://twitter.com/tifkin_/status/1321916444557365248
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
date: 2020-10-29
modified: 2022-10-09
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|contains: \AppData\Local\Temp\ba9ea7344a4a5f591d6e5dc32a13494b\
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetFilename|contains: \AppData\Local\Temp\ba9ea7344a4a5f591d6e5dc32a13494b\

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
TargetFilenamematch
  • \AppData\Local\Temp\ba9ea7344a4a5f591d6e5dc32a13494b\
field:"TargetFilename" kind:match value:"\AppData\Local\Temp\ba9ea7344a4a5f591d6e5dc32a13494b\"