corelight/petitpotam-notest
A Zeek package for detecting some attempts to trigger NTLM relay attacks via the Petit Potam exploit. This package will detect what appear to be successful and unsuccessful exploit attempts. It makes a distinction between them by examining the return code for the EFS DCERPC function calls.
NOTE: This package only detects exploit attempts that are transported over unencrypted SMB. DCERPC calls over encrypted SMB will not be detected. In these cases it is sometimes possible to examin the ntlm.log output for signs of a successful NTLM relay attack in progress.
The easiest way to install this package is through zkg:
zkg install corelight/petitpotam
Use ./testing/Traces/UnPatchedDCOpenFileRaw.pcapng and you can follow along
% zeek -Cr ./testing/Traces/UnPatchedDCOpenFileRaw.pcapng ./scripts/main.zeek
% cat ./notice.log
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path notice
#open 2021-09-08-09-40-22
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p fuid file_mime_type file_desc proto note msg sub src dst p n peer_descr actions email_dest suppress_for remote_location.country_code remote_location.region remote_location.city remote_location.latitude remote_location.longitude
#types time string addr port addr port string string string enum enum string string addr addr port count string set[enum] set[string] interval string string string double double
1630594391.099325 CyNNkV2Rl7jrlWadG7 192.168.0.15 33524 192.168.0.85 445 - - - tcp PetitPotam::PetitPotam Successful PetitPotam NTLM relay attack: efsrpc2 EfsRpcOpenFileRaw() - 192.168.0.15 192.168.0.85 445 - - Notice::ACTION_LOG (empty) 3600.000000 - - - - -
#close 2021-09-08-09-40-22
% cat ./dce_rpc.log
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path dce_rpc
#open 2021-09-08-09-40-22
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p rtt named_pipe endpoint operation
#types time string addr port addr port interval string string string
1630594365.186353 Cdyntb1vGsZnt6aus7 192.168.0.85 57206 192.168.0.80 49677 0.001003 49677 drsuapi DRSUnbind
1630594365.187814 Cdyntb1vGsZnt6aus7 192.168.0.85 57206 192.168.0.80 49677 0.000819 49677 drsuapi DRSUnbind
1630594390.076173 CyNNkV2Rl7jrlWadG7 192.168.0.15 33524 192.168.0.85 445 1.023152 \\pipe\\lsass efsrpc2 EfsRpcOpenFileRaw
1630594416.810307 CDjrA835p6W6vhm4sg 192.168.0.85 57210 192.168.0.80 49677 0.001444 49677 drsuapi DRSGetNCChanges
#close 2021-09-08-09-40-22
Copyright (c) 2021, Corelight, Inc. All rights reserved.
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