Detectionmediumtest
Potential Fake Instance Of Hxtsr.EXE Executed
HxTsr.exe is a Microsoft compressed executable file called Microsoft Outlook Communications. HxTsr.exe is part of Outlook apps, because it resides in a hidden "WindowsApps" subfolder of "C:\Program Files". Any instances of hxtsr.exe not in this folder may be malware camouflaging itself as HxTsr.exe
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Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic2 selectors
detection:
# TODO: Link this to the more generic system process rule
selection:
Image|endswith: '\hxtsr.exe'
filter_main_hxtsr:
Image|contains: ':\program files\windowsapps\microsoft.windowscommunicationsapps_'
Image|endswith: '\hxtsr.exe'
condition: selection and not 1 of filter_main_*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
1
Resolving title…
Internal ResearchMITRE ATT&CK
Tactics
Techniques
Rule Metadata
Rule ID
4e762605-34a8-406d-b72e-c1a089313320
Status
test
Level
medium
Type
Detection
Created
Fri Apr 17
Modified
Thu Feb 08
Author
Path
rules/windows/process_creation/proc_creation_win_hxtsr_masquerading.yml
Raw Tags
attack.defense-evasionattack.t1036