Detection rules › Sigma
Suspicious PROCEXP152.sys File Created In TMP
Detects the creation of the PROCEXP152.sys file in the application-data local temporary folder. This driver is used by Sysinternals Process Explorer but also by KDU (https://github.com/hfiref0x/KDU) or Ghost-In-The-Logs (https://github.com/bats3c/Ghost-In-The-Logs), which uses KDU.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Impairment | T1685 Disable or Modify Tools |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 11 | FileCreate |
Rule body yaml
title: Suspicious PROCEXP152.sys File Created In TMP
id: 3da70954-0f2c-4103-adff-b7440368f50e
status: test
description: |
Detects the creation of the PROCEXP152.sys file in the application-data local temporary folder.
This driver is used by Sysinternals Process Explorer but also by KDU (https://github.com/hfiref0x/KDU) or Ghost-In-The-Logs (https://github.com/bats3c/Ghost-In-The-Logs), which uses KDU.
references:
- https://web.archive.org/web/20230331181619/https://blog.dylan.codes/evading-sysmon-and-windows-event-logging/
author: xknow (@xknow_infosec), xorxes (@xor_xes)
date: 2019-04-08
modified: 2022-11-22
tags:
- attack.defense-impairment
- attack.t1685
logsource:
product: windows
category: file_event
detection:
selection:
TargetFilename|contains: '\AppData\Local\Temp\'
TargetFilename|endswith: 'PROCEXP152.sys'
filter:
Image|contains:
- '\procexp64.exe'
- '\procexp.exe'
- '\procmon64.exe'
- '\procmon.exe'
condition: selection and not filter
falsepositives:
- Other legimate tools using this driver and filename (like Sysinternals). Note - Clever attackers may easily bypass this detection by just renaming the driver filename. Therefore just Medium-level and don't rely on it.
level: medium
Stages and Predicates
Stage 0: condition
selection and not filterStage 1: selection
selection:
TargetFilename|contains: '\AppData\Local\Temp\'
TargetFilename|endswith: 'PROCEXP152.sys'
Stage 2: not filter
filter:
Image|contains:
- '\procexp64.exe'
- '\procexp.exe'
- '\procmon64.exe'
- '\procmon.exe'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
Image | match | \procexp.exe |
Image | match | \procexp64.exe |
Image | match | \procmon.exe |
Image | match | \procmon64.exe |
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 |
|---|---|---|
TargetFilename | ends_with |
|
TargetFilename | match |
|