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Detection rules › Sigma

SyncAppvPublishingServer Execution to Bypass Powershell Restriction

Status
test
Severity
medium
Log source
category ps_script, product windows
Author
Ensar Şamil, @sblmsrsn, OSCD Community
Source
github.com/SigmaHQ/sigma

Detects SyncAppvPublishingServer process execution which usually utilized by adversaries to bypass PowerShell execution restrictions.

Known false positives

  • App-V clients

MITRE ATT&CK coverage

TacticTechniques
Stealth

Telemetry coverage

ProviderRecord / event type
PowerShellEvent ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: SyncAppvPublishingServer Execution to Bypass Powershell Restriction
id: dddfebae-c46f-439c-af7a-fdb6bde90218
related:
    - id: fde7929d-8beb-4a4c-b922-be9974671667
      type: derived
    - id: 9f7aa113-9da6-4a8d-907c-5f1a4b908299
      type: derived
status: test
description: Detects SyncAppvPublishingServer process execution which usually utilized by adversaries to bypass PowerShell execution restrictions.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Syncappvpublishingserver/
author: 'Ensar Şamil, @sblmsrsn, OSCD Community'
date: 2020-10-05
modified: 2022-12-25
tags:
    - attack.stealth
    - attack.t1218
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains: 'SyncAppvPublishingServer.exe'
    condition: selection
falsepositives:
    - App-V clients
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains: 'SyncAppvPublishingServer.exe'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ScriptBlockTextmatch
  • SyncAppvPublishingServer.exe
field:"ScriptBlockText" kind:match value:"SyncAppvPublishingServer.exe"