Kavremover Dropped Binary LOLBIN Usage

Status: test
Severity: high
Log source: category process_creation, product windows
Author: Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects the execution of a signed binary dropped by Kaspersky Lab Products Remover (kavremover) which can be abused as a LOLBIN to execute arbitrary commands and binaries.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1127` Trusted Developer Utilities Proxy Execution
Stealth	`T1127` Trusted Developer Utilities Proxy Execution

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

title: Kavremover Dropped Binary LOLBIN Usage
id: d047726b-c71c-4048-a99b-2e2f50dc107d
status: test
description: Detects the execution of a signed binary dropped by Kaspersky Lab Products Remover (kavremover) which can be abused as a LOLBIN to execute arbitrary commands and binaries.
references:
    - https://nasbench.medium.com/lolbined-using-kaspersky-endpoint-security-kes-installer-to-execute-arbitrary-commands-1c999f1b7fea
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-11-01
tags:
    - attack.execution
    - attack.stealth
    - attack.t1127
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        CommandLine|contains: ' run run-cmd '
    filter_main_legit_parents:
        ParentImage|endswith:
            - '\cleanapi.exe' # When launched from KES installer
            - '\kavremover.exe' # When launched from kavremover.exe
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection and not 1 of filter_main_*

Stage 1: `selection`

selection:
    CommandLine|contains: ' run run-cmd '

Stage 2: `not filter_main_legit_parents`

filter_main_legit_parents:
    ParentImage|endswith:
        - '\cleanapi.exe'
        - '\kavremover.exe'

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`ParentImage`	ends_with	`\cleanapi.exe`	`excludes:ParentImage` `field:"ParentImage" value:"\cleanapi.exe"`
`ParentImage`	ends_with	`\kavremover.exe`	`excludes:ParentImage` `field:"ParentImage" value:"\kavremover.exe"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`run run-cmd`	`field:"CommandLine" kind:match value:" run run-cmd "`