Suspicious PROCEXP152.sys File Created In TMP

Severity: medium
Author: xknow (@xknow_infosec), xorxes (@xor_xes)
Source: upstream

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 Evasion	`T1562.001` Impair Defenses: Disable or Modify Tools

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

TargetFilename|endswith: PROCEXP152.sys
TargetFilename|contains: '\AppData\Local\Temp\'

Stage 2: `not filter`

or:
Image|contains: '\procexp.exe'
Image|contains: '\procexp64.exe'
Image|contains: '\procmon.exe'
Image|contains: '\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
`Image`	match	`\procexp.exe` `\procexp64.exe` `\procmon.exe` `\procmon64.exe`
`TargetFilename`	ends_with	`PROCEXP152.sys`
`TargetFilename`	match	`\AppData\Local\Temp\` corpus 11 (sigma 11)