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Detection rules › Sigma

Chafer Malware URL Pattern

Status
test
Severity
high
Log source
category proxy
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects HTTP request used by Chafer malware to receive data from its C2.

MITRE ATT&CK coverage

TacticTechniques
Command & ControlT1071.001 Application Layer Protocol: Web Protocols

Rule body yaml

title: Chafer Malware URL Pattern
id: fb502828-2db0-438e-93e6-801c7548686d
status: test
description: Detects HTTP request used by Chafer malware to receive data from its C2.
references:
    - https://securelist.com/chafer-used-remexi-malware/89538/
author: Florian Roth (Nextron Systems)
date: 2019-01-31
modified: 2024-02-15
tags:
    - attack.command-and-control
    - attack.t1071.001
    - detection.emerging-threats
logsource:
    category: proxy
detection:
    selection:
        c-uri|contains: '/asp.asp\?ui='
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    c-uri|contains: '/asp.asp\?ui='

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
c-urimatch
  • /asp.asp\?ui=