Azure Sentinel
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This query identifies the launch pattern associated with wastedlocker ransomware.
Reference writeup: https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/wastedlocker-ransomware-us
Reference writeup: https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/wastedlocker-ransomware-us
Original Sigma Rule: https://github.com/Neo23x0/sigma/blob/master/rules/apt/apt_unidentified_nov_18.yml.
Questions via Twitter: @janvonkirchheim.
Questions via Twitter: @janvonkirchheim.
Query #1: Look for public IP addresses that failed to logon to a computer multiple times, using multiple accounts, and eventually succeeded.
Under some circumstances it is only allowed that users
from country X logon to devices from country X.
This query finds logon from users from other countries than X.
The query requires a property to identify the users from
country X. In this example a specific Email Address.
from country X logon to devices from country X.
This query finds logon from users from other countries than X.
The query requires a property to identify the users from
country X. In this example a specific Email Address.
Query for SmartScreen URL blocks, where the user has decided to run the malware nontheless.
An additional optional filter is applied to query only for cases where Microsoft Edge has downloaded a file shortly after the ignored block.
Read more about SmartScreen here: https://docs.microsoft.com/windows/security/threat-protection/windows-defender-smartscreen/windows-defender-smartscreen-overview.
Data availability: These events are available only on Windows 10 version 1703 and onwards.
Tags: #SmartScreen.
An additional optional filter is applied to query only for cases where Microsoft Edge has downloaded a file shortly after the ignored block.
Read more about SmartScreen here: https://docs.microsoft.com/windows/security/threat-protection/windows-defender-smartscreen/windows-defender-smartscreen-overview.
Data availability: These events are available only on Windows 10 version 1703 and onwards.
Tags: #SmartScreen.
These queries check telemetry from the Exploit Guard rule: Rule: Block Office applications from creating child processes.
(Rule ID d4f940ab-401b-4efc-aadc-ad5f3c50688a).
Read more about it here: https://docs.microsoft.com/windows/security/threat-protection/windows-defender-exploit-guard/attack-surface-reduction-exploit-guard.
Oftentimes organizations enable this rule in audit mode and check the results before setting block mode.
You can use query #2 to measure the rule impact on your network in audit mode before turning it to block mode.
Query #1 is used after setting it to block mode - to analyze the block stats.
Tags: #ASR.
Query #1: block stats.
(Rule ID d4f940ab-401b-4efc-aadc-ad5f3c50688a).
Read more about it here: https://docs.microsoft.com/windows/security/threat-protection/windows-defender-exploit-guard/attack-surface-reduction-exploit-guard.
Oftentimes organizations enable this rule in audit mode and check the results before setting block mode.
You can use query #2 to measure the rule impact on your network in audit mode before turning it to block mode.
Query #1 is used after setting it to block mode - to analyze the block stats.
Tags: #ASR.
Query #1: block stats.
This query was originally published in the threat analytics report, CVE-2018-8653 scripting engine vulnerability.
CVE-2018-8653 is a remote code execution vulnerability found in the scripting engine for several releases of Internet Explorer. An attacker exploiting this CVE could use a malicious webpage to gain the same access rights as the currently logged-in user -- which is particularly problematic if the user is an administrator.
Microsoft has since addressed this vulnerability.
The following queries detect possible exploitation of this CVE.
References:
https://nvd.nist.gov/vuln/detail/CVE-2018-8653
https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2018-8653
CVE-2018-8653 is a remote code execution vulnerability found in the scripting engine for several releases of Internet Explorer. An attacker exploiting this CVE could use a malicious webpage to gain the same access rights as the currently logged-in user -- which is particularly problematic if the user is an administrator.
Microsoft has since addressed this vulnerability.
The following queries detect possible exploitation of this CVE.
References:
https://nvd.nist.gov/vuln/detail/CVE-2018-8653
https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2018-8653
This query was originally published in the threat analytics report, Emulation-evading JavaScripts.
Attackers in several ransomware campaigns have employed heavily obfuscated JavaScript code, in order to implant malware or execute malicious commands. The obfuscation is intended to help the code evade security systems and potentially escape sandbox environments.
The following query detects when Word or File Explorer have launched files with a .jse extension. Attackers involved in various human-operated campaigns have been known to embed a heavily obfuscated JavaScript file in malicious Word docs. The loader is used to download and install the banking trojan, Trickbot.
See Detect .jse file creation events for a similar technique.
Reference - https://www.microsoft.com/security/blog/2020/03/05/human-operated-ransomware-attacks-a-preventable-disaster/
Attackers in several ransomware campaigns have employed heavily obfuscated JavaScript code, in order to implant malware or execute malicious commands. The obfuscation is intended to help the code evade security systems and potentially escape sandbox environments.
The following query detects when Word or File Explorer have launched files with a .jse extension. Attackers involved in various human-operated campaigns have been known to embed a heavily obfuscated JavaScript file in malicious Word docs. The loader is used to download and install the banking trojan, Trickbot.
See Detect .jse file creation events for a similar technique.
Reference - https://www.microsoft.com/security/blog/2020/03/05/human-operated-ransomware-attacks-a-preventable-disaster/
Search for processes modifying the registry to disable security features.
Search for the creation of a new user using a known DEV-0270 username/password schema.
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