시그마 룰: Sophos 방화벽 Asnarok 악성코드 캠페인

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Eugene Tkachenko

커뮤니티 프로그램 리드

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4월 29, 2020 · 2 분 읽기

Sophos XG Firewall에 대한 긴급 보안 업데이트가 이번 토요일에 출시되었습니다. 이 업데이트는 실제로 악용되고 있는 제로데이 SQL 인젝션 원격 코드 실행 취약점을 패치합니다. 이 취약점은 사이버 범죄자들이 Sophos 방화벽의 관리 인터페이스를 통해 이를 손상시키고 Asnarok 맬웨어를 배포할 수 있게 합니다. 이 트로이 목마는 방화벽의 라이선스와 일련번호, 사용자 이메일, 관리자의 솔트된 SHA256 해시, 암호화된 비밀번호를 훔칩니다. 위협으로부터 조직을 보호하기 위해 방화벽에서 핫픽스의 자동 설치가 활성화되어 있는지 확인하십시오: https://community.sophos.com/kb/en-us/135415우리의 SOC 팀은 Sophos의 보안 권고에 제공된 IOC를 기반으로 Sigma 규칙을 발표했습니다. 이를 사용하여 맬웨어의 흔적을 찾아내고 XG Firewall이 손상되었는지 확인할 수 있습니다. Uncoder를 사용하여 Sigma 규칙을 보안 플랫폼에 적합한 탐지 콘텐츠로 변환할 수 있습니다. 또한, Threat Detection Marketplace에서 모든 사용 가능한 번역과 함께 규칙을 확인할 수 있습니다: https://tdm.socprime.com/tdm/info/RN0oGcnrZfoU/HYulvHEB1-hfOQirCe1I/#Uncoder 링크: https://uncoder.io/Uncoder 사용자 가이드 여기에 있습니다: https://socprime.com/en/blog/uncoder-io-user-guide/Sigma:

title: Sophos Firewall Asnarok 맬웨어 캠페인 (IOC)
status: stable
description: 2020년 4월, Sophos 방화벽은 관리 인터페이스를 통해 Sophos 방화벽을 손상시키는 제로데이 SQLi 익스플로잇을 사용한 배우에 의해 표적이 되었습니다. 전달된 맬웨어는 “asnarok”이라고 명명되었습니다.
references:
– https://news.sophos.com/en-us/2020/04/26/asnarok/
author: SOC Prime 팀
logsource:
category: any
detection:
keyword:
– ‘736da16da96222d3dfbb864376cafd58239344b536c75841805c661f220072e5’
– ‘a226c6a641291ef2916118b048d508554afe0966974c5ca241619e8a375b8c6b’
– ‘4de3258ebba1ef3638642a011020a004b4cd4dbe8cd42613e24edf37e6cf9d71’
– ‘9650563aa660ccbfd91c0efc2318cf98bfe9092b4a2abcd98c7fc44aad265fda’
– ‘8e9965c2bb0964fde7c1aa0e8b5d74158e37443d857fc227c1883aa74858e985’
– ’31e43ecd203860ba208c668a0e881a260ceb24cb1025262d42e03209aed77fe4′
– ‘/sp/sophos.dat’
– ‘.post_MI’
– ‘filedownloaderserverx.com’
– ‘filedownloaderserver.com’
– ‘updatefileservercross.com’
– ‘43.229.55.44’
– ‘38.27.99.69’
– ‘sophosfirewallupdate.com’
– ‘filedownloaderservers.com’
– ‘ragnarokfromasgard.com’
– ‘sophosenterprisecenter.com’
– ‘sophoswarehouse.com’
– ‘sophosproductupdate.com’
– ‘sophostraining.org’
condition: keyword
falsepositives:
– 이 규칙은 위협 인텔리전스 피드에서 IOC 데이터에 트리거될 수 있습니다
level: critical

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PHPSESSID	Preserves user session state across page requests. Cookie generated by applications based on the PHP language. This is a general purpose identifier used to maintain user session variables. It is normally a random generated number, how it is used can be specific to the site, but a good example is maintaining a logged-in status for a user between pages.
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Name	Descripiton
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tuuid_last_update	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
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APID	Collects anonymous data related to the user's visits to the website.
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dpm	Via a unique ID that is used for semantic content analysis, the user's navigation on the website is registered and linked to offline data from surveys and similar registrations to display targeted ads.
acs	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.
clid	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.
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PUBMDCID	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
PugT	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
ssi	Registers a unique ID that identifies a returning user's device. The ID is used for targeted ads.
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wam-sync	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
wui	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
AFFICHE_W	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
B	Collects anonymous data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The registered data is used to categorise the users' interest and demographical profiles with the purpose of customising the website content depending on the visitor.
1P_JAR	These cookies are used to gather website statistics, and track conversion rates.
APISID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
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Name	Descripiton
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IDE	Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
r/collect	Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
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khaos	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
put_#	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
rpb	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
rpx	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
tap.php	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.

시그마 룰: Sophos 방화벽 Asnarok 악성코드 캠페인

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