Potential Fake Instance Of Hxtsr.EXE Executed

 1title: Potential Fake Instance Of Hxtsr.EXE Executed
 2id: 4e762605-34a8-406d-b72e-c1a089313320
 3status: test
 4description: |
 5    HxTsr.exe is a Microsoft compressed executable file called Microsoft Outlook Communications.
 6    HxTsr.exe is part of Outlook apps, because it resides in a hidden "WindowsApps" subfolder of "C:\Program Files".
 7    Any instances of hxtsr.exe not in this folder may be malware camouflaging itself as HxTsr.exe    
 8references:
 9    - Internal Research
10author: Sreeman
11date: 2020/04/17
12modified: 2024/02/08
13tags:
14    - attack.defense_evasion
15    - attack.t1036
16logsource:
17    product: windows
18    category: process_creation
19detection:
20    # TODO: Link this to the more generic system process rule
21    selection:
22        Image|endswith: '\hxtsr.exe'
23    filter_main_hxtsr:
24        Image|contains: ':\program files\windowsapps\microsoft.windowscommunicationsapps_'
25        Image|endswith: '\hxtsr.exe'
26    condition: selection and not 1 of filter_main_*
27falsepositives:
28    - Unknown
29level: medium