zeek October 2020

zeek@lists.zeek.org

22 participants
18 discussions

[Bro] Bro with PF_RING receive repeating data packets

by Bowen Li

Hi all, Recently I have some problems with Bro and PF_RING in cluster. On my server, when I have less than 32 worker threads(rings), everything is okay, but when I use worker threads more than 32, pf_ring start to receive repeating data packets. For example, rings less than 32, I send 400000 packets to server and pf_ring info in /proc shows there is 400000 packets in rings, but when rings greater than 32, I can get 800000 packets when 33 rings and 1200000 packets when 34 rings and so on. I guess if there is some rules that a pf_ring or a bro cluster can only support less than 32 rings or worker threads on a server or some other reasons? Any insight would be helpful.

5 months

Anyone using Intel X710 NICs?

by Vlad Grigorescu

We recently purchased some Intel XXV710 NICs for our Zeek systems. However, symmetric hashing does not seem to work on them, at least not completely. There was some discussion here regarding adding some functionality to the driver to make it work, however this never landed: https://sourceforge.net/p/e1000/mailman/message/35199068/ This post discusses how the X710 controller must be configured differently from the 82599 10G controller (used by the X520 cards): https://haryachyy.wordpress.com/2019/01/18/learning-dpdk-symmetric-rss/ The odd part is that following the SEPTun-MarkII guide[1] makes it *mostly* work, but we're consistently finding that ~1-2% of the traffic is not being symmetrically hashed. We're testing with can-i-use-afpacket-fanout[2] and Zeek 3.2. The most damning evidence is an Intel rep telling[3] a customer: > Unfortunately, we have been informed that the only support to setup symmetric RSS is via DPDK. Searching the mailing list archives, I found a couple of posts where people were encouraged to use X710-based cards, so I'm left wondering: Are there people using these? Are they also seeing this 1-2% asymmetry? Or am I missing a configuration tweak? Thanks, --Vlad [1] - < https://github.com/pevma/SEPTun-Mark-II/blob/master/SEPTun-Mark-II.rst> [2] - <https://github.com/JustinAzoff/can-i-use-afpacket-fanout> [3] - < https://community.intel.com/t5/Ethernet-Products/X-L-710-supports-symmetric… >

7 months, 2 weeks

zkg unbundle fails

by Jan Hugo Prins | BetterBe

Hello, I have a IDS cluster with Zeek and I try to add some packages using the Zeek Package Manager. The thing is that this cluster has not internet access, so I try to use the bundle/unbundle method. I have a different system with zeek installed where I have done the package installation, and then zkg bundle. When I do the unbundle on my Zeek Manager node I get the following error: [zeek@idslog01 ~]$ zkg -vvv unbundle zeek-packages.bundle 2020-10-19 18:00:38 DEBUG init Manager version 2.3.1 2020-10-19 18:00:38 DEBUG creating source clone of "zeek" at /opt/zeek/.zkg/clones/source/zeek 2020-10-19 18:00:38 WARNING failed to clone git repo: 'git clone --recursive --depth=1 https://github.com/zeek/packages /opt/zeek/.zkg/clones/source/zeek --no-single-branch' returned with exit code 128 stderr: 'fatal: unable to access 'https://github.com/zeek/packages/': Failed to connect to 140.82.118.4: Network is unreachable' warning: skipped using package source named "zeek": failed to clone git repo 2020-10-19 18:00:38 DEBUG getting bundle info for file "zeek-packages.bundle" 2020-10-19 18:00:38 DEBUG getting info for bundled package "hassh" 2020-10-19 18:00:38 DEBUG getting info on "/opt/zeek/.zkg/scratch/bundle/hassh" 2020-10-19 18:00:38 INFO getting info on "/opt/zeek/.zkg/scratch/bundle/hassh": invalid git repo path: 'git fetch --tags --no-recurse-submodules' returned with exit code 128 stderr: 'fatal: attempt to fetch/clone from a shallow repository fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.' 2020-10-19 18:00:38 INFO getting info on "/opt/zeek/.zkg/scratch/bundle/hassh": matched no source package 2020-10-19 18:00:38 DEBUG getting info for bundled package "ja3" 2020-10-19 18:00:38 DEBUG getting info on "/opt/zeek/.zkg/scratch/bundle/ja3" 2020-10-19 18:00:38 INFO getting info on "/opt/zeek/.zkg/scratch/bundle/ja3": invalid git repo path: 'git fetch --tags --no-recurse-submodules' returned with exit code 128 stderr: 'fatal: attempt to fetch/clone from a shallow repository fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists.' 2020-10-19 18:00:38 INFO getting info on "/opt/zeek/.zkg/scratch/bundle/ja3": matched no source package error: bundle zeek-packages.bundle contains invalid package /opt/zeek/.zkg/scratch/bundle/hassh: package name not found in sources and also not a usable git URL (invalid or inaccessible, use -vvv for details) Zeek itself and the package manager are installed using RPM. Zeek version 3.0.11 zkg version 2.3.1 Could someone help me getting this fixed, or help me understand what I'm doing wrong? -- Kind regards Jan Hugo Prins /DevOps Engineer/ <https://betterbe.com> Auke Vleerstraat 140 E 7547 AN Enschede CC no. 08097527 <https://www.kvk.nl/orderstraat/product-kiezen/?kvknummer=080975270000> *T* +31 (0) 53 48 00 694 <tel:+31534800694> *E* jprins(a)betterbe.com <mailto:jprins@betterbe.com> *M* +31 (0)6 263 58 951 <tel:+31 (0)6 263 58 951> www.betterbe.com <https://www.betterbe.com> BetterBe accepts no liability for the content of this email, or for the consequences of any actions taken on the basis of the information provided, unless that information is subsequently confirmed in writing. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.

1 year, 7 months

Reading paps offline continuously with Seek 3.2.2

by Carlos Lopez

Hi all, Is it possible to read and process a pcap’s dir offline with Zeek version 3.2.2? Exists some option to analyze a pcap’s dir with several pcaps stored? Regards, C. L. Martinez

1 year, 8 months

problem zeek clusters

by qing wang

I have 2 workers. when after zeekctl deploy. successed worker-1 run crorrectly worker-2 did not run zeek script but those scripts has already synchronized from manager. why and how could i fixed it? -- С уважением

1 year, 8 months

ssh-detect-bruteforcing: auth_success and auth_attempts are not recorded in ssh.log

by seshu.pyla＠gmail.com

Hi, I am new to the bro(/zeek), and learning how it can be used as IDS in my Debian system. I have installed bro and trying a simple bro script for detecting ssh bruteforcing. bro version 2.5.5 used below command to monitor and check if it detects the ssh bruteforcing bro -C -i enp0s3 /usr/share/bro/policy/protocols/ssh/detect-bruteforcing.bro from second machine i have attempted to login the bro mornitoring system with wrong passwords. and i have checked ssh.log in the bro monitoring system, and i see empty fields for the fields auth_success and auth_attempts. =================== #separator \x09 #set_separator , #empty_field (empty) #unset_field - #path ssh #open 2020-10-19-17-53-39 #fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p version auth_success auth_attempts direction client server cipher_alg mac_alg compression_alg kex_alg host_key_alg host_key #types time string addr port addr port count bool count enum string string string string string string string string 1603110214.365582 CaH1Hl15NEBAytUr9 x.x.x.x 41312 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110225.733577 C8TODm3pZ4odMo4bwd x.x.x.x 41314 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110245.189601 CX9LRm3UYb547RPlpk x.x.x.x 41316 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110251.429585 CsBjxNleCthYGIjvi x.x.x.x 41318 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110257.117558 C4Rb6PFExiWeki4yi x.x.x.x 41320 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110261.973553 CQQqVFy8DTiWC1NR4 x.x.x.x 41322 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110269.885564 CceiaZ3Zs0wQPKQ3Sh x.x.x.x 41324 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110273.677558 CYApL72VvS3HvCbiEg x.x.x.x 41326 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110280.101578 CTEs0f1GXcynXhg5Bj x.x.x.x 41328 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110294.229556 CDrJFS3Y5NO3nDCFX8 x.x.x.x 41330 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110299.449560 CHhUZr3tFDYwn5z3e x.x.x.x 41332 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - 1603110304.985599 CQgpQM2k88Fx0b9od x.x.x.x 41334 y.y.y.y 22 2 - - - SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 chacha20-poly1305(a)openssh.com umac-64-etm(a)openssh.com none curve25519-sha256 rsa-sha2-512 - #close 2020-10-19-18-01-19 =================== so i could not understand how to detect the bruteforce attack from these logs? Could any one help me to understand or correct me if i am missing some thing here Thanks

1 year, 8 months

Missing stats.log file

by nuke＠pcshome.net

I have a SecurityOnion and when I installed the emailer I started getting messages about /nsm/bro/spool/stats.log No such file or directory reported by stats-to-csv manager. Any guidance on where to start tracking this down is appreciated. I tried adding the file manually but when the cron job runs it seems to remove it. I do see stats.log files in other places. /nsm/bro/logs/stats/stats.log /nsm/sensor_data/pcs-so-m1-enp0s26u1u3/stats.log /nsm/sensor_data/pcs-so-m1-enp21s0/stats.log /var/lib/docker/overlay2/f0b8b82e33704350d0271ad1abfee8eff55e312df1ff5ad84b65c0c6ba156d3d/diff/var/log/domain_stats/domain_stats.log Thanks,

1 year, 8 months

Zeek cluster weird logs

by Jan Hugo Prins | BetterBe

Hello fellow Zeek users, I have a Zeek cluster running and I monitor the inbound and outbound traffic at 3 different locations where I have my BGP connections. I have a lot of asymmetric on my BGP routers, which is completely normal. But in Zeek I see a lot of messages that indicate to me that Zeek is not able to handle this correctly. Is there are way to fix this? 3 locations 3 BGP routers 6 uplinks PF_Ring on every location where I pull both the outbound and the inbound traffic into the probe using a fibertab. In the probe I join the inbound and outbound traffic again in a zbalance_ipc cluster, and every zbalance_ipc cluster has 2 queues that are both handled by a Zeek process. So in total I have 12 Zeek workers, 1 proxy on the management node and a logging engine on the management node. I have almost no packet loss on my Zeek instances, so that works all fine. -- Kind regards Jan Hugo Prins /DevOps Engineer/ <https://betterbe.com> Auke Vleerstraat 140 E 7547 AN Enschede CC no. 08097527 <https://www.kvk.nl/orderstraat/product-kiezen/?kvknummer=080975270000> *T* +31 (0) 53 48 00 694 <tel:+31534800694> *E* jprins(a)betterbe.com <mailto:jprins@betterbe.com> *M* +31 (0)6 263 58 951 <tel:+31 (0)6 263 58 951> www.betterbe.com <https://www.betterbe.com> BetterBe accepts no liability for the content of this email, or for the consequences of any actions taken on the basis of the information provided, unless that information is subsequently confirmed in writing. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.

1 year, 8 months

Detecting CVE-2020-16898

by Aashish Sharma

Here is a take at detecting CVE-2020-16898 https://github.com/initconf/CVE-2020-16898-Bad-Neighbor.git Based of the blog post : https://www.mcafee.com/blogs/other-blogs/mcafee-labs/cve-2020-16898-bad-nei… While, I am running it on our cluster (s), I don't yet have pcaps to say if this is getting a hit or not. Any other feedback, improvements most welcome. Aashish

1 year, 8 months

BZAR Update - .zeek File Extensions and ATT&CK Sub-Techniques

by Mark I Fernandez

All - New update to BZAR is available. Summary of changes is listed below. For more information, see the CHANGES file. * [09/29/2020] Renamed .bro scripts to .zeek * [10/09/2020] Renamed eight (8) ATT&CK(r) Techniques, according to the new ATT&CK Sub-Techniques nomenclature in the July 2020 (v7) release of MITRE's Enterprise ATT&CK framework. Some techniques split apart into two or more sub-techniques. The new nomenclature is represented in BZAR-related entries in the Zeek Notice Log. For the new version, use the Zeek package manager or download from the following URL: https://github.com/mitre-attack/bzar Mark I. Fernandez The MITRE Corporation mfernandez(a)mitre.org<mailto:mfernandez@mitre.org>

1 year, 8 months

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zeek October 2020