Potentially Suspicious Electron Application CommandLine

calendar Mar 26, 2024 · attack.execution  ·
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Detects potentially suspicious CommandLine of electron apps (teams, discord, slack, etc.). This could be a sign of abuse to proxy execution through a signed binary.

Sigma rule (View on GitHub)

 1title: Potentially Suspicious Electron Application CommandLine
 2id: 378a05d8-963c-46c9-bcce-13c7657eac99
 3related:
 4    - id: f26eb764-fd89-464b-85e2-dc4a8e6e77b8
 5      type: similar
 6status: experimental
 7description: Detects potentially suspicious CommandLine of electron apps (teams, discord, slack, etc.). This could be a sign of abuse to proxy execution through a signed binary.
 8references:
 9    - https://positive.security/blog/ms-officecmd-rce
10    - https://lolbas-project.github.io/lolbas/Binaries/Teams/
11    - https://lolbas-project.github.io/lolbas/Binaries/Msedge/
12    - https://lolbas-project.github.io/lolbas/Binaries/msedgewebview2/
13    - https://medium.com/@MalFuzzer/one-electron-to-rule-them-all-dc2e9b263daf
14    - https://chromium.googlesource.com/chromium/chromium/+/master/content/public/common/content_switches.cc
15author: frack113, Nasreddine Bencherchali (Nextron Systems)
16date: 2023/09/05
17modified: 2023/11/09
18tags:
19    - attack.execution
20logsource:
21    category: process_creation
22    product: windows
23detection:
24    selection_img:
25        - Image|endswith:
26              # Add more electron based app to the list
27              - '\chrome.exe'
28              - '\code.exe'
29              - '\discord.exe'
30              - '\GitHubDesktop.exe'
31              - '\keybase.exe'
32              - '\msedge_proxy.exe'
33              - '\msedge.exe'
34              - '\msedgewebview2.exe'
35              - '\msteams.exe'
36              - '\slack.exe'
37              - '\Teams.exe'
38        - OriginalFileName:
39              # Add more electron based app to the list
40              - 'chrome.exe'
41              - 'code.exe'
42              - 'discord.exe'
43              - 'GitHubDesktop.exe'
44              - 'keybase.exe'
45              - 'msedge_proxy.exe'
46              - 'msedge.exe'
47              - 'msedgewebview2.exe'
48              - 'msteams.exe'
49              - 'slack.exe'
50              - 'Teams.exe'
51    selection_cli:
52        CommandLine|contains:
53            - '--browser-subprocess-path'
54            - '--gpu-launcher'
55            - '--renderer-cmd-prefix'
56            - '--utility-cmd-prefix'
57    condition: all of selection_*
58falsepositives:
59    - Legitimate usage for debugging purposes
60# Increase the level once FP rate is known better (see status)
61level: medium

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