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Detection rules › Sigma

HackTool - RemoteKrbRelay SMB Relay Secrets Dump Module Indicators

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

Detects the creation of file with specific names used by RemoteKrbRelay SMB Relay attack module.

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1219.002 Remote Access Tools: Remote Desktop Software

Event coverage

ProviderEventTitle
SysmonEvent ID 11FileCreate

Rule body yaml

title: HackTool - RemoteKrbRelay SMB Relay Secrets Dump Module Indicators
id: 3ab79e90-9fab-4cdf-a7b2-6522bc742adb
status: test
description: Detects the creation of file with specific names used by RemoteKrbRelay SMB Relay attack module.
references:
    - https://github.com/CICADA8-Research/RemoteKrbRelay/blob/19ec76ba7aa50c2722b23359bc4541c0a9b2611c/Exploit/RemoteKrbRelay/Relay/Attacks/RemoteRegistry.cs#L31-L40
author: Nasreddine Bencherchali (Nextron Systems)
date: 2024-06-27
tags:
    - attack.command-and-control
    - attack.t1219.002
logsource:
    product: windows
    category: file_event
detection:
    selection:
        TargetFilename|endswith:
            - ':\windows\temp\sam.tmp'
            - ':\windows\temp\sec.tmp'
            - ':\windows\temp\sys.tmp'
    condition: selection
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetFilename|endswith:
        - ':\windows\temp\sam.tmp'
        - ':\windows\temp\sec.tmp'
        - ':\windows\temp\sys.tmp'

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
TargetFilenameends_with
  • :\windows\temp\sam.tmp
  • :\windows\temp\sec.tmp
  • :\windows\temp\sys.tmp