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Detection rules › Sigma

Suspicious Ping/Del Command Combination

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Ilya Krestinichev
Source
github.com/SigmaHQ/sigma

Detects a method often used by ransomware. Which combines the "ping" to wait a couple of seconds and then "del" to delete the file in question. Its used to hide the file responsible for the initial infection for example

MITRE ATT&CK coverage

TacticTechniques
StealthT1070.004 Indicator Removal: File Deletion

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: Suspicious Ping/Del Command Combination
id: 54786ddc-5b8a-11ed-9b6a-0242ac120002
status: test
description: Detects a method often used by ransomware. Which combines the "ping" to wait a couple of seconds and then "del" to delete the file in question. Its used to hide the file responsible for the initial infection for example
references:
    - https://blog.sygnia.co/kaseya-ransomware-supply-chain-attack
    - https://media.kasperskycontenthub.com/wp-content/uploads/sites/43/2022/06/23093553/Common-TTPs-of-the-modern-ransomware_low-res.pdf
    - https://www.acronis.com/en-us/blog/posts/lockbit-ransomware/
    - https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/blackbyte-exbyte-ransomware
author: Ilya Krestinichev
date: 2022-11-03
modified: 2024-03-05
tags:
    - attack.stealth
    - attack.t1070.004
logsource:
    category: process_creation
    product: windows
detection:
    # Note: In the case of sysmon and similar logging utilities, see this discussion https://github.com/SigmaHQ/sigma/discussions/4277
    # Example: "C:\Windows\System32\cmd.exe"  /C ping 127.0.0.7 -n 3 > Nul & fsutil file setZeroData offset=0 length=524288 "C:\Users\User\Desktop\lockbit\lockbit.exe" & Del /f /q "C:\Users\User\Desktop\lockbit\lockbit.exe".
    selection_count:
        CommandLine|contains|windash: ' -n '
    selection_nul:
        CommandLine|contains: 'Nul' # Covers "> Nul" and ">Nul "
    selection_del_param:
        CommandLine|contains|windash:
            - ' -f '
            - ' -q '
    selection_all:
        CommandLine|contains|all:
            - 'ping' # Covers "ping" and "ping.exe"
            - 'del '
    condition: all of selection_*
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

all of selection_*

Stage 1: selection_count

selection_count:
    CommandLine|contains|windash: ' -n '

Stage 2: selection_nul

selection_nul:
    CommandLine|contains: 'Nul'

Stage 3: selection_del_param

selection_del_param:
    CommandLine|contains|windash:
        - ' -f '
        - ' -q '

Stage 4: selection_all

selection_all:
    CommandLine|contains|all:
        - 'ping'
        - 'del '

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.

FieldKindValues
CommandLinematch
  • -f transforms: windash corpus 8 (sigma 6, chronicle 2)
  • -n transforms: windash corpus 3 (sigma 3)
  • -q transforms: windash corpus 2 (sigma 2)
  • Nul
  • del corpus 5 (sigma 5)
  • ping corpus 6 (sigma 4, splunk 1, kusto 1)