Suspicious Child Process of SAP NetWeaver - Linux

Status: experimental
Severity: medium
Log source: product linux, category process_creation
Author: Elastic (idea), Swachchhanda Shrawan Poudel (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects suspicious child processes spawned by SAP NetWeaver on Linux systems that could indicate potential exploitation of vulnerability that allows arbitrary execution via webshells such as CVE-2025-31324.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application
Execution	`T1059.003` Command and Scripting Interpreter: Windows Command Shell

Event coverage

Provider	Event
Sysmon-for-Linux	Event ID 1

Rule body yaml

title: Suspicious Child Process of SAP NetWeaver - Linux
id: 69dea60b-2deb-4c9e-a685-ad542f4367f9
status: experimental
description: |
    Detects suspicious child processes spawned by SAP NetWeaver on Linux systems that could indicate potential
    exploitation of vulnerability that allows arbitrary execution via webshells such as CVE-2025-31324.
author: Elastic (idea), Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-04-28
tags:
    - attack.execution
    - attack.initial-access
    - attack.t1190
    - attack.persistence
    - attack.t1059.003
    - cve.2025-31324
    - detection.emerging-threats
references:
    - https://reliaquest.com/blog/threat-spotlight-reliaquest-uncovers-vulnerability-behind-sap-netweaver-compromise/
    - https://onapsis.com/blog/active-exploitation-of-sap-vulnerability-cve-2025-31324/
logsource:
    category: process_creation
    product: linux
detection:
    selection_parent_img:
        ParentImage|contains:
            - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/work'
            - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/root'
    selection_current_dict:
        CurrentDirectory|contains:
            - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/work'
            - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/root'
    selection_child:
        Image|endswith:
            - '/ash'
            - '/bash'
            - '/csh'
            - '/dash'
            - '/ksh'
            - '/sh'
            - '/tcsh'
            - '/zsh'
            - '/python'
            - '/python2'
            - '/python3'
            - '/perl'
            - '/ruby'
            - '/curl'
            - '/wget'
            - '/nc'
            - '/netcat'
            - '/ncat'
            - '/socat'
            - '/nmap'
            - '/telnet'
            - '/awk'
            - '/sed'
    condition: (selection_parent_img or selection_current_dict) and selection_child
falsepositives:
    - Legitimate administrative activities such as software updates
level: medium

Stages and Predicates

Stage 0: `condition`

(selection_parent_img or selection_current_dict) and selection_child

Stage 1: `selection_parent_img`

selection_parent_img:
    ParentImage|contains:
        - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/work'
        - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/root'

Stage 2: `selection_current_dict`

selection_current_dict:
    CurrentDirectory|contains:
        - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/work'
        - '/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/root'

Stage 3: `selection_child`

selection_child:
    Image|endswith:
        - '/ash'
        - '/bash'
        - '/csh'
        - '/dash'
        - '/ksh'
        - '/sh'
        - '/tcsh'
        - '/zsh'
        - '/python'
        - '/python2'
        - '/python3'
        - '/perl'
        - '/ruby'
        - '/curl'
        - '/wget'
        - '/nc'
        - '/netcat'
        - '/ncat'
        - '/socat'
        - '/nmap'
        - '/telnet'
        - '/awk'
        - '/sed'

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
`CurrentDirectory`	match	`/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/root` `/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/work`
`Image`	ends_with	`/ash` `/awk` `/bash` `/csh` `/curl` `/dash` `/ksh` `/nc` `/ncat` `/netcat` `/nmap` `/perl` `/python` `/python2` `/python3` `/ruby` `/sed` `/sh` `/socat` `/tcsh` `/telnet` `/wget` `/zsh`
`ParentImage`	match	`/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/root` `/j2ee/cluster/apps/sap.com/irj/servlet_jsp/irj/work`

`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)

Suspicious Child Process of SAP NetWeaver - Linux

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_parent_img`

Stage 2: `selection_current_dict`

Stage 3: `selection_child`

Indicators

Keyboard shortcuts

Search operators

Suspicious Child Process of SAP NetWeaver - Linux

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_parent_img

Stage 2: selection_current_dict

Stage 3: selection_child

Indicators

Stage 0: `condition`

Stage 1: `selection_parent_img`

Stage 2: `selection_current_dict`

Stage 3: `selection_child`