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Detection rules › Sigma

Suspicious Execution From Outlook Temporary Folder

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects a suspicious program execution in Outlook temp folder

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1566.001 Phishing: Spearphishing Attachment

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: Suspicious Execution From Outlook Temporary Folder
id: a018fdc3-46a3-44e5-9afb-2cd4af1d4b39
status: test
description: Detects a suspicious program execution in Outlook temp folder
author: Florian Roth (Nextron Systems)
references:
    - Internal Research
date: 2019-10-01
modified: 2022-10-09
tags:
    - attack.initial-access
    - attack.t1566.001
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|contains: '\Temporary Internet Files\Content.Outlook\'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|contains: '\Temporary Internet Files\Content.Outlook\'

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.

FieldKindValues
Imagematch
  • \Temporary Internet Files\Content.Outlook\ corpus 2 (sigma 2)