Windows.Carving.BumbleBee

This artficat will detect running BumbleBee processes and subsequently extract the command and control servers with the destination port 443.

name: Windows.Carving.BumbleBee
author: Angelo Violetti @SEC Defence
type: CLIENT
description: |
        This artficat will detect running BumbleBee processes and subsequently extract the command and control servers with the destination port 443.
reference:
  - sec-consult.com/blog/detail/bumblebee-hunting-with-a-velociraptor/
parameters:
  - name: TargetFileGlob
    default:
  - name: PidRegex
    default: .
  - name: ProcessRegex
    default: .
  - name: DetectionYara
    default: |
        rule BumbleBee_Unpacked{
            meta:
                author = "Angelo Violetti @ SEC Defence"
                date = "2023-02-23"
            
            strings:
                $s1 = {?? 83 ?? 18 10 72 03 ?? 8B ?? 44 8B ?? 48 8B ?? 48 8D 4C 24 30 E8 ?? ?? FF FF 90}
                $s2 = {48 8D 4C 24 30 E8 ?? ?? FF FF 90}
                $s3 = {48 8d 4c 24 30 e8 ?? ?? FF FF}
            
            condition:
                all of ($s*)
        }
        
  - name: ExtractIPsYara
    default: |
        rule BumbleBee_IPs{
            meta:
                author = "Angelo Violetti @ SEC Defence"
                date = "2023-02-23"
                description = "Extracts the IP addresses with the destination port equal to 443 from BumbleBee processes"
            
            strings:
            $IP = {?? ?? ?? 2e ?? ?? ?? 2e ?? ?? ?? 2e ?? ?? ?? 00 (?? | ?? ??) 00 00 00 00 00 00 00 0f 00 00 00 00 00 00 00 34 34 33 00 00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 0F 00 00 00 00 00 00 00}
          condition:
            $IP
        }

sources:
  - precondition:
      SELECT OS From info() where OS = 'windows'

    query: |
        -- Find velociraptor process
        LET me <= getpid()

        -- Find all processes and add filters
        LET processes = SELECT Name AS ProcessName, CommandLine, Pid
                        FROM pslist()
                        WHERE Name =~ ProcessRegex
                            AND Pid =~ PidRegex
                            AND NOT Pid in me.Pid

        -- Scan processes in scope with our DetectionYara
        LET processDetections = SELECT * FROM foreach(row=processes,
                                query={
                                    SELECT * FROM if(condition=TargetFileGlob="",
                                        then={
                                            SELECT *, ProcessName, CommandLine, Pid, Rule AS YaraRule
                                            FROM proc_yara(pid=Pid, rules=DetectionYara)
                                        })
                                })
                                
        -- Scan the process for the IP addresses
        LET ipaddressDetections = SELECT ProcessName, CommandLine, Pid, Strings.Data AS IPAddresses FROM foreach(row=processDetections, query={SELECT *, ProcessName, CommandLine, Pid FROM proc_yara(pid=Pid, rules=ExtractIPsYara)})
        
        -- Extract the command and control servers
        LET CommandandControlServers = SELECT * FROM foreach(row=ipaddressDetections, query={SELECT ProcessName, CommandLine, Pid, g1 FROM parse_records_with_regex(accessor="data", file=IPAddresses, regex='''(\d+\.\d+\.\d+\.\d+)''')})

        -- Output the command and control servers
        SELECT ProcessName, CommandLine, Pid, str(str=g1) AS BumbleBeeC2 FROM CommandandControlServers