Greenbug Espionage Group Indicators

SIGMA detection rule by Florian Roth (Nextron Systems) · NOASSERTION

Detects tools and process executions used by Greenbug in their May 2020 campaign as reported by Symantec

title: Greenbug Espionage Group Indicators
id: 3711eee4-a808-4849-8a14-faf733da3612
status: test
description: Detects tools and process executions used by Greenbug in their May 2020 campaign as reported by Symantec
references:
    - https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/greenbug-espionage-telco-south-asia
author: Florian Roth (Nextron Systems)
date: 2020-05-20
modified: 2023-03-09
tags:
    - attack.stealth
    - attack.g0049
    - attack.execution
    - attack.t1059.001
    - attack.command-and-control
    - attack.t1105
    - attack.t1036.005
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        Image|endswith:
            - ':\ProgramData\adobe\Adobe.exe'
            - ':\ProgramData\oracle\local.exe'
            - '\revshell.exe'
            - '\infopagesbackup\ncat.exe'
            - ':\ProgramData\comms\comms.exe'
    selection_msf:
        CommandLine|contains|all:
            - '-ExecutionPolicy Bypass -File'
            - '\msf.ps1'
    selection_ncat:
        CommandLine|contains|all:
            - 'infopagesbackup'
            - '\ncat'
            - '-e cmd.exe'
    selection_powershell:
        CommandLine|contains:
            - 'system.Data.SqlClient.SqlDataAdapter($cmd); [void]$da.fill'
            - '-nop -w hidden -c $k=new-object'
            - '[Net.CredentialCache]::DefaultCredentials;IEX '
            - ' -nop -w hidden -c $m=new-object net.webclient;$m'
            - '-noninteractive -executionpolicy bypass whoami'
            - '-noninteractive -executionpolicy bypass netstat -a'
    selection_other:
        CommandLine|contains: 'L3NlcnZlcj1'  # base64 encoded '/server='
    condition: 1 of selection_*
falsepositives:
    - Unlikely
level: critical

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

c8b1b0bb-a8f9-474a-8eb3-fcfb607e8c91

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

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