Django Framework Exceptions

Status: stable
Severity: medium
Log source: product django, category application
Author: Thomas Patzke
Source: github.com/SigmaHQ/sigma

Detects suspicious Django web application framework exceptions that could indicate exploitation attempts

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application

Rule body yaml

title: Django Framework Exceptions
id: fd435618-981e-4a7c-81f8-f78ce480d616
status: stable
description: Detects suspicious Django web application framework exceptions that could indicate exploitation attempts
references:
    - https://docs.djangoproject.com/en/1.11/ref/exceptions/
    - https://docs.djangoproject.com/en/1.11/topics/logging/#django-security
author: Thomas Patzke
date: 2017-08-05
modified: 2020-09-01
tags:
    - attack.initial-access
    - attack.t1190
logsource:
    category: application
    product: django
detection:
    keywords:
        - SuspiciousOperation
        # Subclasses of SuspiciousOperation
        - DisallowedHost
        - DisallowedModelAdminLookup
        - DisallowedModelAdminToField
        - DisallowedRedirect
        - InvalidSessionKey
        - RequestDataTooBig
        - SuspiciousFileOperation
        - SuspiciousMultipartForm
        - SuspiciousSession
        - TooManyFieldsSent
        # Further security-related exceptions
        - PermissionDenied
    condition: keywords
falsepositives:
    - Application bugs
level: medium

Stages and Predicates

Stage 0: `condition`

keywords

Stage 1: `keywords`

keywords:
    - SuspiciousOperation
    - DisallowedHost
    - DisallowedModelAdminLookup
    - DisallowedModelAdminToField
    - DisallowedRedirect
    - InvalidSessionKey
    - RequestDataTooBig
    - SuspiciousFileOperation
    - SuspiciousMultipartForm
    - SuspiciousSession
    - TooManyFieldsSent
    - PermissionDenied

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`f`	Follow link (`Shift` = new tab)
`/`	Focus search
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`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Django Framework Exceptions

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `keywords`

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Django Framework Exceptions

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: keywords

Stage 0: `condition`

Stage 1: `keywords`