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Detection rules › Sigma

Elise Backdoor Activity

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

Detects Elise backdoor activity used by APT32

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1059.003 Command and Scripting Interpreter: Windows Command Shell

Event coverage

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

Rule body yaml

title: Elise Backdoor Activity
id: e507feb7-5f73-4ef6-a970-91bb6f6d744f
status: test
description: Detects Elise backdoor activity used by APT32
references:
    - https://community.rsa.com/community/products/netwitness/blog/2018/02/13/lotus-blossom-continues-asean-targeting
    - https://web.archive.org/web/20200302083912/https://www.accenture.com/t20180127T003755Z_w_/us-en/_acnmedia/PDF-46/Accenture-Security-Dragonfish-Threat-Analysis.pdf
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2018-01-31
modified: 2023-03-09
tags:
    - attack.g0030
    - attack.g0050
    - attack.s0081
    - attack.execution
    - attack.t1059.003
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection_other_svchost:
        Image|endswith: '\Microsoft\Network\svchost.exe'
    selection_other_del:
        CommandLine|contains|all:
            - '\Windows\Caches\NavShExt.dll'
            - '/c del'
    selection_dll_path:
        CommandLine|endswith:
            - '\AppData\Roaming\MICROS~1\Windows\Caches\NavShExt.dll'
            - '\AppData\Roaming\Microsoft\Windows\Caches\NavShExt.dll'
    selection_dll_function:
        CommandLine|contains: ',Setting'
    condition: 1 of selection_other_* or all of selection_dll_*
falsepositives:
    - Unlikely
level: critical

Stages and Predicates

Stage 0: condition

1 of selection_other_* or all of selection_dll_*

Stage 1: selection_other_svchost

selection_other_svchost:
    Image|endswith: '\Microsoft\Network\svchost.exe'

Stage 2: selection_other_del

selection_other_del:
    CommandLine|contains|all:
        - '\Windows\Caches\NavShExt.dll'
        - '/c del'

Stage 3: selection_dll_path

selection_dll_path:
    CommandLine|endswith:
        - '\AppData\Roaming\MICROS~1\Windows\Caches\NavShExt.dll'
        - '\AppData\Roaming\Microsoft\Windows\Caches\NavShExt.dll'

Stage 4: selection_dll_function

selection_dll_function:
    CommandLine|contains: ',Setting'

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
CommandLineends_with
  • \AppData\Roaming\MICROS~1\Windows\Caches\NavShExt.dll
  • \AppData\Roaming\Microsoft\Windows\Caches\NavShExt.dll
CommandLinematch
  • ,Setting
  • /c del
  • \Windows\Caches\NavShExt.dll
Imageends_with
  • \Microsoft\Network\svchost.exe