rule: removed Zebrocy rule because it doesn't work that way

reason: command line gets split up at the '&' character, which results in two command lines

rules/apt/apt_sofacy_zebrocy.yml

@@ -1,20 +0,0 @@
-title: Sofacy Zebrocy
-id: 8545cb01-102e-41ee-babd-46bd24e8cb97
-author: Florian Roth
-description: Detects Sofacy's Zebrocy malware execution
-references:
-    - https://app.any.run/tasks/54acca9a-394e-4384-a0c8-91a96d36c81d
-tags:
-    - attack.execution
-    - attack.g0020
-    - attack.t1059
-logsource:
-    category: process_creation
-    product: windows
-detection:
-    selection:
-        CommandLine: '*cmd.exe /c SYSTEMINFO & TASKLIST'
-    condition: selection
-falsepositives:
-    - Unknown
-level: critical