Potential Atlassian Confluence CVE-2021-26084 Exploitation Attempt

calendar Jun 20, 2023 · attack.initial_access attack.execution attack.t1190 attack.t1059 cve.2021.26084 detection.emerging_threats  ·
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Detects spawning of suspicious child processes by Atlassian Confluence server which may indicate successful exploitation of CVE-2021-26084

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 1title: Potential Atlassian Confluence CVE-2021-26084 Exploitation Attempt
 2id: 245f92e3-c4da-45f1-9070-bc552e06db11
 3status: test
 4description: Detects spawning of suspicious child processes by Atlassian Confluence server which may indicate successful exploitation of CVE-2021-26084
 5references:
 6    - https://nvd.nist.gov/vuln/detail/CVE-2021-26084
 7    - https://confluence.atlassian.com/doc/confluence-security-advisory-2021-08-25-1077906215.html
 8    - https://github.com/h3v0x/CVE-2021-26084_Confluence
 9author: Bhabesh Raj
10date: 2021/09/08
11modified: 2023/02/13
12tags:
13    - attack.initial_access
14    - attack.execution
15    - attack.t1190
16    - attack.t1059
17    - cve.2021.26084
18    - detection.emerging_threats
19logsource:
20    category: process_creation
21    product: windows
22detection:
23    selection:
24        # Monitor suspicious child processes spawned by Confluence
25        ParentImage|endswith: '\Atlassian\Confluence\jre\bin\java.exe'
26        CommandLine|contains:
27            - 'certutil'
28            - 'cmd /c'
29            - 'cmd /k'
30            - 'cscript'
31            - 'curl'
32            - 'ipconfig'
33            - 'powershell'
34            - 'pwsh'
35            - 'regsvr32'
36            - 'rundll32'
37            - 'whoami'
38            - 'wscript'
39    condition: selection
40falsepositives:
41    - Unknown
42level: high

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