Detection rules › Kusto
Corelight - Multiple Compressed Files Transferred over HTTP
'Detects compressed archives transferre over HTTP.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Exfiltration |
Rule body
id: 4e55e306-3022-43a1-870a-41c4d5116079
name: Corelight - Multiple Compressed Files Transferred over HTTP
description: |
'Detects compressed archives transferre over HTTP.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: Corelight
dataTypes:
- Corelight_v2_http
- corelight_http
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- Exfiltration
relevantTechniques:
- T1567
query: |
let threshold = 25;
corelight_http
| where method in~ ('POST', 'PUT')
| where isempty(referrer)
| where orig_mime_types has_any ('application/vnd.ms-cab-compressed', 'application/warc', 'application/x-7z-compressed', 'application/x-ace', 'application/x-arc', 'application/x-archive', 'application/x-arj', 'application/x-compress', 'application/x-cpio', 'application/x-dmg', 'application/x-eet', 'application/x-gzip', 'application/x-lha', 'application/x-lrzip', 'application/x-lz4', 'application/x-lzma', 'application/x-lzh', 'application/x-lzip', 'application/x-rar', 'application/x-rpm', 'application/x-stuffit', 'application/x-tar', 'application/x-xz', 'application/x-zoo', 'application/zip')
| summarize count() by uri, id_orig_h, bin(TimeGenerated, 15m)
| where count_ > threshold
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: id_orig_h
version: 2.1.1
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 25;
Stage 1: source
corelight_http
Stage 2: where
| where method in~ ('POST', 'PUT')
Stage 3: where
| where isempty(referrer)
Stage 4: where
| where orig_mime_types has_any ('application/vnd.ms-cab-compressed', 'application/warc', 'application/x-7z-compressed', 'application/x-ace', 'application/x-arc', 'application/x-archive', 'application/x-arj', 'application/x-compress', 'application/x-cpio', 'application/x-dmg', 'application/x-eet', 'application/x-gzip', 'application/x-lha', 'application/x-lrzip', 'application/x-lz4', 'application/x-lzma', 'application/x-lzh', 'application/x-lzip', 'application/x-rar', 'application/x-rpm', 'application/x-stuffit', 'application/x-tar', 'application/x-xz', 'application/x-zoo', 'application/zip')
Stage 5: summarize
| summarize count() by uri, id_orig_h, bin(TimeGenerated, 15m)
Stage 6: where
| where count_ > threshold
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
count_ | gt |
| field:"count_" kind:gt value:"25" |
method | in |
| field:"method" kind:in |
orig_mime_types | match |
| field:"orig_mime_types" kind:match |
referrer | is_null | field:"referrer" kind:is_null |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
id_orig_h | summarize |
uri | summarize |