Detection rules › Splunk
Mavinject Execution (EDR)
Mavinject is a legitimate Windows component that can be used, and abused, to perform arbitrary code injections inside any running process. As this is a common component on Windows, it can be leveraged to perform living-off-the-land attacks
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1055.001 Process Injection: Dynamic-link Library Injection |
| Stealth | T1055.001 Process Injection: Dynamic-link Library Injection, T1218 System Binary Proxy Execution |
| Credential Access | T1056.004 Input Capture: Credential API Hooking |
| Collection | T1056.004 Input Capture: Credential API Hooking |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
id: '7825.12629'
title: Mavinject Execution
description: 'Mavinject is a legitimate Windows component that can be used, and abused,
to perform arbitrary code injections inside any running process. As this is a common
component on Windows, it can be leveraged to perform living-off-the-land attacks.
Living Off the Land Binary and Scripts (LOLBAS) (LOLBIN) -- Threat Actor Assocaition:
Lancefly -- Atomics T1218 Test #1 Atomics T1055.001 Test#1 Atomics T1056.004 Test#1'
logic_format: Splunk
logic: ' `get_endpoint_data` `get_endpoint_data_edr` ((event_type IN ("childproc","netconn","proc"))
OR (TERM(ProcessRollup2) OR Type=Process) OR TERM(DeviceProcessEvents)) ("mavinject.exe")
OR TERM(/INJECTRUNNING) | table _time, host, user signature_id, process, process_*,
parent_* | bin span=1s | stats values(*) as * by _time, host `hec_collect`'
techniques:
- defense-evasion:process injection:dynamic-link library injection
- collection:input capture:credential api hooking
- defense-evasion:system binary proxy execution
- credential-access:input capture:credential api hooking
- privilege-escalation:process injection:dynamic-link library injection
technique_id:
- T1056.004
- T1218
- T1055.001
data_category:
- Process command-line parameters
- EDR Logs
references:
- https://lolbas-project.github.io/lolbas/Binaries/Mavinject/
- https://posts.specterops.io/mavinject-exe-functionality-deconstructed-c29ab2cf5c0e
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_edr` ((event_type IN ("childproc","netconn","proc")) OR (TERM(ProcessRollup2) OR Type=Process) OR TERM(DeviceProcessEvents)) ("mavinject.exe") OR TERM(/INJECTRUNNING)
Stage 2: table
| table _time, host, user signature_id, process, process_*, parent_*
Stage 3: bucket
| bin span=1s
Stage 4: stats
| stats values(*) as * by _time, host `hec_collect`
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 |
|---|---|---|
event_type | in |
|
Search terms
Bare-string tokens in the SPL search body. Splunk matches each token against _raw (the untyped raw event text) anywhere it appears, not against a specific field. These don't surface in the Indicators table because they aren't predicates on a known field.
| Stage | Term |
|---|---|
| 1 | TERM |
| 1 | ProcessRollup2 |
| 1 | TERM |
| 1 | DeviceProcessEvents |
| 1 | "mavinject.exe" |
| 1 | "/INJECTRUNNING" |