Third Party Software DLL Sideloading

Status: test
Severity: medium
Log source: product windows, category image_load
Author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)
Source: github.com/SigmaHQ/sigma

Detects DLL sideloading of DLLs that are part of third party software (zoom, discord....etc)

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1574.001` Hijack Execution Flow: DLL
Stealth	`T1574.001` Hijack Execution Flow: DLL

Event coverage

Provider	Event	Title
Sysmon	Event ID 7	Image loaded

Rule body yaml

title: Third Party Software DLL Sideloading
id: f9df325d-d7bc-4a32-8a1a-2cc61dcefc63
status: test
description: Detects DLL sideloading of DLLs that are part of third party software (zoom, discord....etc)
references:
    - https://hijacklibs.net/ # For list of DLLs that could be sideloaded (search for dlls mentioned here in there)
author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)
date: 2022-08-17
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    # Lenovo
    selection_lenovo:
        ImageLoaded|endswith: '\commfunc.dll'
    filter_lenovo:
        - ImageLoaded|contains: '\AppData\local\Google\Chrome\Application\'
        - ImageLoaded|startswith:
              - 'C:\Program Files\Lenovo\Communications Utility\'
              - 'C:\Program Files (x86)\Lenovo\Communications Utility\'
    # Toshiba
    selection_toshiba:
        ImageLoaded|endswith: '\tosbtkbd.dll'
    filter_toshiba:
        ImageLoaded|startswith:
            - 'C:\Program Files\Toshiba\Bluetooth Toshiba Stack\'
            - 'C:\Program Files (x86)\Toshiba\Bluetooth Toshiba Stack\'
    # Zoom (FP with System32)
    # selection_zoom:
    #     ImageLoaded|endswith: '\version.dll'
    # filter_zoom:
    #     ImageLoaded|startswith: 'C:\Users\'
    #     ImageLoaded|contains: '\AppData\Roaming\Zoom\bin\'
    condition: (selection_lenovo and not filter_lenovo) or (selection_toshiba and not filter_toshiba)
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

(selection_lenovo and not filter_lenovo) or (selection_toshiba and not filter_toshiba)

Stage 1: `selection_lenovo`

selection_lenovo:
    ImageLoaded|endswith: '\commfunc.dll'

Stage 2: `not filter_lenovo`

filter_lenovo:
    - ImageLoaded|contains: '\AppData\local\Google\Chrome\Application\'
    - ImageLoaded|startswith:
          - 'C:\Program Files\Lenovo\Communications Utility\'
          - 'C:\Program Files (x86)\Lenovo\Communications Utility\'

Stage 3: `selection_toshiba`

selection_toshiba:
    ImageLoaded|endswith: '\tosbtkbd.dll'

Stage 4: `not filter_toshiba`

filter_toshiba:
    ImageLoaded|startswith:
        - 'C:\Program Files\Toshiba\Bluetooth Toshiba Stack\'
        - 'C:\Program Files (x86)\Toshiba\Bluetooth Toshiba Stack\'

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`ImageLoaded`	match	`\AppData\local\Google\Chrome\Application\`
`ImageLoaded`	starts_with	`C:\Program Files (x86)\Lenovo\Communications Utility\`
`ImageLoaded`	starts_with	`C:\Program Files\Lenovo\Communications Utility\`
`ImageLoaded`	starts_with	`C:\Program Files (x86)\Toshiba\Bluetooth Toshiba Stack\`
`ImageLoaded`	starts_with	`C:\Program Files\Toshiba\Bluetooth Toshiba Stack\`

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`ImageLoaded`	ends_with	`\commfunc.dll` `\tosbtkbd.dll`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`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)

Third Party Software DLL Sideloading

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_lenovo`

Stage 2: `not filter_lenovo`

Stage 3: `selection_toshiba`

Stage 4: `not filter_toshiba`

Exclusions

Indicators

Keyboard shortcuts

Search operators

Third Party Software DLL Sideloading

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_lenovo

Stage 2: not filter_lenovo

Stage 3: selection_toshiba

Stage 4: not filter_toshiba

Exclusions

Indicators

Stage 0: `condition`

Stage 1: `selection_lenovo`

Stage 2: `not filter_lenovo`

Stage 3: `selection_toshiba`

Stage 4: `not filter_toshiba`