Bumblebee 20230626 Files

KQL detection rule by reversinglabs · MIT

detect 20230626 BumbleBee file IOCs in CEF, MDE, and Sysmon logs

// detect 20230626 BumbleBee file IOCs in CEF, MDE, and Sysmon logs
let BumbleBeeHashes = externaldata(BumbleBeeHash:string)
[
    @"https://raw.githubusercontent.com/reversinglabs/reversinglabs-siem-rules/master/Malware/BumbleBee/20230626/KQL/bumblebee-20230626-hashes.txt"
];
(union isfuzzy=true
(CommonSecurityLog
| where isnotempty(FileHash)
| join kind=inner BumbleBeeHashes on $left.FileHash == $right.BumbleBeeHash
| extend timestamp = TimeGenerated, HostCustomEntity = SourceHostName),
(DeviceFileEvents
| where isnotempty(SHA256)
| join kind=inner BumbleBeeHashes on $left.SHA256 == $right.BumbleBeeHash
| extend timestamp = TimeGenerated, HostCustomEntity = DeviceName),
(DeviceFileEvents
| where ActionType == "FileCreated"
| where FolderPath matches regex @"C:\\Users\\.*\\AppData\\Roaming\\Microsoft\\Templates\\[0-9]{6}\.dat"
| extend timestamp = TimeGenerated, HostCustomEntity = DeviceName),
(SysmonParser
| where EventID == 11
| where TargetFilename matches regex @"C:\\Users\\.*\\AppData\\Roaming\\Microsoft\\Templates\\[0-9]{6}\.dat"))

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

97cdc91d-60b3-48fd-84c1-ae0096216d6c

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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

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

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

[[ currentRule.title ]]

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