Detection rules › Splunk
Wscript_Cscript Execution (Windows Event Log)
Monitor the execution of wscript or cscript processes as these are commonly utilized by threat actors to run malicious VBScript or JScript code
MITRE ATT&CK coverage
References
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Security-Auditing | Event ID 4688: A new process has been created. |
Rule body
id: '1029.1034'
title: Wscript_Cscript Execution
description: 'Monitor the execution of wscript or cscript processes as these are commonly
utilized by threat actors to run malicious VBScript or JScript code Threat Actor
Association: Actinium/Gamaredon/Primitive Bear, Andariel, Antlion, APT10/menuPass,
APT28/Fancy Bear, APT29/Nobelium/Cozy Bear, APT31, APT33, APT35, APT37/Chinotto,
APT43, Blind Eagle/APT-C-36, Carbanak, Evilnum, FIN7, Gamaredon Group/Shuckworm,
Kimsuky, Mustang Panda (aka. Stately Taurus//Earth Preta/BRONZE PRESIDENT/TA416/RedDelta),
NewsPenguin, Prophet Spider, TA2541, TA428, TA551, UAC-0057 (GhostWriter), WIRTE,
Witchetty Software Association: Agent Tesla, Astaroth, Avaddon, Black Basta, BazarLoader,
Cring, DarkGate, MirrorBlast, NanoCore, PoetRAT, QakBot, RATDispenser, SquirrelWaffle,
Trickbot, Remcos RAT, WhisperGate, Zloader Atomics T1105 Test #11 Atomics T1059.005
Test #1 Atomics T1082 Test #9 Atomics T1547.001 Test #5 -- #TrendingThreat #Russia
#Ukraine'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR
"<EventID>4688<" OR Type=Process) ("cscript.exe" OR "WScript.exe" OR "cscript" OR
"wscript") | regex process="(?i)(w|c)script.{1,}?\.\w{2,4}" | table _time, host,
user process, process_*, parent_*, signature_id | bin span=1s | stats values(*)
as * by _time, host '
techniques:
- execution:command and scripting interpreter:visual basic
- execution:command and scripting interpreter:javascript
technique_id:
- T1059.007
- T1059.005
data_category:
- Windows event logs
references:
- https://secure.anvilogic.com/use_cases?id=AVL_UC1029
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_winevent` (TERM(EventCode=4688) OR "<EventID>4688<" OR Type=Process) ("cscript.exe" OR "WScript.exe" OR "cscript" OR "wscript")
Stage 2: regex
| regex process="(?i)(w|c)script.{1,}?\.\w{2,4}"
Stage 3: table
| table _time, host, user process, process_*, parent_*, signature_id
Stage 4: bucket
| bin span=1s
Stage 5: stats
| stats values(*) as * by _time, host
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
EventCode | eq |
| field:"EventID" kind:eq value:"4688" |
process | regex_match |
| field:"CommandLine" kind:regex_match |
Search terms
These SPL tokens match against raw event text.
| Stage | Term |
|---|---|
| 1 | "<EventID>4688<" |
| 1 | "cscript.exe" |
| 1 | "WScript.exe" |
| 1 | "cscript" |
| 1 | "wscript" |