SyncAppvPublishingServer Execute Arbitrary PowerShell Code

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

Executes arbitrary PowerShell code using SyncAppvPublishingServer.exe.

Known false positives

App-V clients

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1218` System Binary Proxy Execution

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: SyncAppvPublishingServer Execute Arbitrary PowerShell Code
id: fbd7c32d-db2a-4418-b92c-566eb8911133
related:
    - id: fde7929d-8beb-4a4c-b922-be9974671667
      type: obsolete
status: test
description: Executes arbitrary PowerShell code using SyncAppvPublishingServer.exe.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218/T1218.md
    - https://lolbas-project.github.io/lolbas/Binaries/Syncappvpublishingserver/
author: frack113
date: 2021-07-12
modified: 2022-10-04
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\SyncAppvPublishingServer.exe'
        - OriginalFileName: 'syncappvpublishingserver.exe'
    selection_cli:
        CommandLine|contains: '"n; '
    condition: all of selection_*
falsepositives:
    - App-V clients
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith: '\SyncAppvPublishingServer.exe'
    - OriginalFileName: 'syncappvpublishingserver.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains: '"n; '

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`"n;`	`field:"CommandLine" kind:match`
`Image`	ends_with	`\SyncAppvPublishingServer.exe`	`field:"Image" kind:ends_with value:"\SyncAppvPublishingServer.exe"`
`OriginalFileName`	eq	`syncappvpublishingserver.exe`	`field:"OriginalFileName" kind:eq value:"syncappvpublishingserver.exe"`

SyncAppvPublishingServer Execute Arbitrary PowerShell Code

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_cli

Indicators

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli`