Rule Digest: Detection Content by SOC Prime Team

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Eugene Tkachenko

커뮤니티 프로그램 리드

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5월 30, 2020 · 4 분 읽기

Rule Digest: Detection Content by SOC Prime Team

최신 Rule Digest를 여러분께 소개하게 되어 기쁩니다. 이번에는 이전 다이제스트와는 달리, SOC Prime 팀만의 규칙으로 구성되어 있습니다. 이 주제는 cmdline을 통해 sysmon 로그를 분석하여 악의적인 활동을 찾는 데 도움이 되는 모든 규칙을 포함하고 있습니다.

그러나 Rule Digest로 직접 이동하기 전에, SOC Prime Threat Bounty Program 멤버들의 규칙들이 이번 주 우리 블로그에 게시되었습니다.

이번 주의 규칙: Turla Group 아리엘 밀라훌: https://socprime.com/blog/rule-of-the-week-turla-group/

탐지 콘텐츠: Scarab 랜섬웨어 아리엘 밀라훌: https://socprime.com/blog/detection-content-scarab-ransomware/

위협 사냥 콘텐츠: PipeMon 악성코드 탐지 아리엘 밀라훌: https://socprime.com/blog/threat-hunting-content-pipemon-malware-detection/

IOC 시그마: GreenBug APT 그룹의 활동 에미르 에르도안: https://socprime.com/blog/ioc-sigma-greenbug-apt-group-activities/

탐지 콘텐츠: Malspam이 Zloader 악성코드를 다운로드함 에미르 에르도안: https://socprime.com/blog/detection-content-malspam-downloads-zloader-malware/

이제 이번 주의 다이제스트에 포함된 규칙을 살펴보겠습니다.

Impacket 파일 이름 가능성 (cmdline 활용) SOC Prime 팀

https://tdm.socprime.com/tdm/info/BPKo7b7xyKlM/0QphTHIBAq_xcQY4IElg/?p=1

Impacket은 프로그램적으로 네트워크 프로토콜을 구성하고 조작하기 위해 Python으로 작성된 오픈 소스 모듈 모음입니다. Impacket은 원격 서비스 실행, Kerberos 조작, Windows 자격 증명 덤핑, 패킷 스니핑 및 중계 공격 등을 위한 여러 도구를 포함합니다. 기본 파일 이름은 Windows 디렉터리(예: C:windows)에 있으며 __ + str(time.time())의 결과로 패턴 __#####를 포함합니다. 발견 항목은 비어 있을 수도 있으며 명령 결과(예: net/ipconfig/etc와 같은 발견 명령의 출력)를 포함할 수도 있습니다.

비정상적인 MMC 자식 프로세스 (cmdline 활용) SOC Prime 팀

https://tdm.socprime.com/tdm/info/x37MWadchVPb/M-ZlTHIBv8lhbg_iteTp/?p=1

Microsoft Management Console (MMC)는 시스템 관리자와 고급 사용자가 시스템을 구성하고 모니터링할 수 있는 인터페이스를 제공하는 Windows 운영 체제의 구성 요소입니다. MMC는 com/dcom을 통해 횡적 이동이나 프로세스 체인을 가장하는 데 악용될 수 있습니다.

Certutil을 사용한 데이터 인코딩 (cmdline 활용) SOC Prime 팀

https://tdm.socprime.com/tdm/info/NzzfJwxMu0xj/XeZvTHIBv8lhbg_iF-QM/?p=1

CertUtil.exe는 Microsoft에서 인증 기관(CA) 데이터와 구성 요소를 조작하기 위한 관리자 명령줄 도구입니다. 여기에는 인증서와 인증서 체인의 검증, CA 설정 정보의 덤프 및 디스플레이, 인증 서비스 구성 등이 포함됩니다. CertUtil을 실행하려면 항상 최소 하나의 명령 옵션이 필요합니다. 이 옵션은 일반적으로 인증서에 수행할 작업 유형을 지정합니다. 이 규칙은 생활 환경을 악용하는 기법으로서 certutil의 사용을 탐지합니다.

comsvcs.dll을 사용한 자격 증명 덤핑 가능성 (cmdline 활용) SOC Prime 팀

https://tdm.socprime.com/tdm/info/CrWJtnD4DfNE/ZeZwTHIBv8lhbg_iGeRr/?p=1

comsvcs.dll은 Microsoft Windows 운영 체제의 일부입니다. 악의적 사용자는 MiniDumpW라는 함수를 내보내는 이 Windows 기본 DLL을 악용할 수 있습니다. 따라서 rundll32.exe를 사용하여 LSASS를 포함한 프로세스의 MiniDump를 생성하는 것이 가능합니다. 이 규칙은 손상된 호스트에서 ‘comsvcs.dll’ 라이브러리를 사용하여 자격 증명을 덤핑할 때 이를 탐지합니다.

클립보드에서 데이터 수집 가능성 (cmdline 활용) SOC Prime 팀

https://tdm.socprime.com/tdm/info/Kh2BQYb5fTAC/ciFwTHIBjwDfaYjKlKIR/?p=1

적은 파워셸 cmdlet을 사용하여 타겟 호스트의 클립보드 내부 데이터를 수집할 수 있습니다. 이 규칙은 손상된 시스템을 나타내는 이러한 악의적인 활동을 탐지합니다.

이 컬렉션의 규칙은 다음 플랫폼에 대한 번역이 포함되어 있습니다:

SIEM: Azure Sentinel, ArcSight, QRadar, Splunk, Graylog, Sumo Logic, ELK Stack, RSA NetWitness, Logpoint, Humio

EDR: Carbon Black, Elastic Endpoint

MITRE ATT&CK:

전술: 방어회피, 실행, 지속성, 권한 상승, 발견, 횡적 이동, 데이터 유출, 자격 증명 접근

기술: Regsvr32 (T1117), Rundll32 (T1085), 소프트웨어 패킹 (T1027.002), 스크립팅 (T1064), 명령줄 인터페이스 (T1059), 레지스트리 실행 키 / 시작 폴더 (T1060), 프로세스 인젝션 (1055), 루트 인증서 설치 (T1130), 레지스트리 수정 (T1112), 레지스트리 조회 (T1012), 컴포넌트 객체 모델 및 분산 COM (T1175), Windows 관리 계측 (T1047), 파일 또는 정보의 난독화/디코드 (T1140), 데이터 암호화 (T1022), 자격증명 덤핑 (T1003)

다음 주에 있을 다이제스트를 기다려 주십시오.

다음 웹 세미나를 놓치지 마세요 MITRE ATT&CK™ 및 시그마 규칙을 사용하여 적극적인 위협 사냥 활성화: https://my.socprime.com/en/webinar-using-mitre-att/

안전하게 지내세요!

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Name	Descripiton
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.
sp_i	Used to store information about authenticated User.
sp_r	Used to store information about authenticated User.
sp_a	Used to store information about authenticated User.

Name	Descripiton
tuuid	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.
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.
um	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.
umeh	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.
na_sc_x	Used by the social sharing platform AddThis to keep a record of parts of the site that has been visited in order to recommend other parts of the site.
APID	Collects anonymous data related to the user's visits to the website.
IDSYNC	Collects anonymous data related to the user's visits to the website.
_cc_aud	Collects anonymous statistical 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 purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
_cc_cc	Collects anonymous statistical 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 purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
_cc_dc	Collects anonymous statistical 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 purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
_cc_id	Collects anonymous statistical 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 purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
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.
KRTBCOOKIE_#	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.
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.
_tmid	Registers a unique ID that identifies the user's device upon return visits. The ID is used to target ads in video clips.
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.
HSID	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.
NID	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.
SAPISID	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.
SID	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.
SIDCC	Security cookie to protect users data from unauthorised access.
SSID	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.
__utmx	This cookie is associated with Google Website Optimizer, a tool designed to help site owners improve their wbesites. It is used to distinguish between two varaitions a webpage that might be shown to a visitor as part of an A/B split test. This helps site owners to detemine which version of a page performs better, and therefore helps to improve the website.
__utmxx	This cookie is associated with Google Website Optimizer, a tool designed to help site owners improve their wbesites. It is used to distinguish between two varaitions a webpage that might be shown to a visitor as part of an A/B split test. This helps site owners to detemine which version of a page performs better, and therefore helps to improve the website.

Name	Descripiton
_hjid	Hotjar cookie. This cookie is set when the customer first lands on a page with the Hotjar script. It is used to persist the random user ID, unique to that site on the browser. This ensures that behavior in subsequent visits to the same site will be attributed to the same user ID.
_hjIncludedInSample	This cookie is associated with web analytics functionality and services from Hot Jar, a Malta based company. It uniquely identifies a visitor during a single browser session and indicates they are included in an audience sample.
intercom-id-[xxx]	This cookie is used by Intercom as a session so that users can continue a chat as they move through the site.
intercom-session-[xxx]	Used to keeping track of sessions and remember logins and conversations.
demdex	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.
CookieConsent	Stores the user's cookie consent state for the current domain.
__cfduid	Used by the content network, Cloudflare, to identify trusted web traffic.
ss	These cookies enable the website to provide enhanced functionality and personalisation . They may be set by us or by third party providers whose services we have added to our pages. These services may include the Live Chat facility, Contact Us form(s), the Product Quotation forms and submission process, and the Email Newsletter sign up functionality .

Name	Descripiton
_ga	This cookie name is asssociated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page. Registers a unique ID that is used to generate statistical data on how the visitor uses the website. request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.
_gat	Used by Google Analytics to throttle request rate. This cookie name is associated with Google Universal Analytics, according to documentation it is used to throttle the request rate - limiting the collection of data on high traffic sites. It expires after 10 minutes.
_gid	This cookie name is asssociated with Google Universal Analytics. This appears to be a new cookie and as of Spring 2017 no information is available from Google. It appears to store and update a unique value for each page visited. Registers a unique ID that is used to generate statistical data on how the visitor uses the website.
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.
test_cookie	Used to check if the user's browser supports cookies.
collect	Used to send data to Google Analytics about the visitor's device and behaviour. Tracks the visitor across devices and marketing channels.
ads/user-lists/#	These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites.
c	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.
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.

Rule Digest: Detection Content by SOC Prime Team

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