added detect-malcious-use-of-msiexec.md

Author: martyav

Execution/detect-malcious-use-of-msiexec.md

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+# Detect malicious use of Msiexec
+
+This query was originally published in the threat analytics report, *Msiexec abuse*.
+
+*[Msiexec.exe](https://docs.microsoft.com/windows-server/administration/windows-commands/msiexec)* is a Windows component that installs files with the *.msi* extension. These kinds of files are Windows installer packages, and are used by a wide array of legitimate software. However, malicious actors can re-purpose msiexec.exe for living-off-the-land attacks, where they use legitimate system binaries on the compromised device to perform attacks.
+
+The following query detects activity associated with misuse of msiexec.exe, particularly alongside [mimikatz](https://www.varonis.com/blog/what-is-mimikatz/), a common credential dumper and privilege escalation tool.
+
+## Query
+
+```Kusto
+//Find possible download and execution using Msiexec
+DeviceProcessEvents
+| where Timestamp > ago(30d)
+//MSIExec
+| where FileName =~ "msiexec.exe" and 
+//With domain in command line
+(ProcessCommandLine has "http" and ProcessCommandLine has "return")//Find PowerShell running files from the temp folder
+DeviceProcessEvents
+| where Timestamp > ago(30d)
+//Looking for PowerShell
+| where FileName =~ "powershell.exe"
+//Looking for %temp% in the command line indicating deployment 
+and ProcessCommandLine contains "%temp%"//Find credential theft attempts using Msiexec to run Mimikatz commands
+DeviceProcessEvents
+| where Timestamp > ago(30d)
+| where InitiatingProcessFileName =~ "msiexec.exe"
+//Mimikatz commands
+and (ProcessCommandLine contains "privilege::" 
+or ProcessCommandLine has "sekurlsa" 
+or ProcessCommandLine contains "token::" 
+```
+
+## Category
+
+This query can be used to detect the following attack techniques and tactics ([see MITRE ATT&CK framework](https://attack.mitre.org/)) or security configuration states.
+
+| Technique, tactic, or state | Covered? (v=yes) | Notes |
+|------------------------|----------|-------|
+| Initial access |  |  |
+| Execution | v |  |
+| Persistence |  |  |
+| Privilege escalation | v |  |
+| Defense evasion |  |  |
+| Credential Access | v |  |
+| Discovery |  |  |
+| Lateral movement |  |  |
+| Collection |  |  |
+| Command and control |  |  |
+| Exfiltration |  |  |
+| Impact |  |  |
+| Vulnerability |  |  |
+| Misconfiguration |  |  |
+| Malware, component |  |  |
+
+## Contributor info
+
+**Contributor:** Microsoft Threat Protection team