The WannaCry journey from a SOC point of view – internal sinkholing of killswitch servers

[ see also: The WannaCry journey from a SOC point of view ]

In the previous post I described how our Security Operation Center managed the WannaCry news.

We also made a lot of side activities in the past hours and one of these was to implement an internal sinkholing of the killswitch servers in case some clients where infected; with a working local sinkholing we where able to avoid the ransomware spreading in case of infection.

Killswitch for WonnaCry ransomware
Killswitch for WonnaCry ransomware

How? Let me explain.

Continue reading “The WannaCry journey from a SOC point of view – internal sinkholing of killswitch servers”

Advertisements

The WannaCry journey from a SOC point of view

#WCry at University of Milano-Bicocca
#WCry at University of Milano-Bicocca

[ see also: how and why we implemented local sinkholed killswitch servers ]

In the past hours a new ransomware called WannaCry (or WCry or WannaCrypt0) spread very fast on Internet and targeted a lot of public and private organizations. The ransomware make use of public exploits related to the last Shadow Brokers leak, in particular MS17-010 vulnerability that was fixed by Microsoft on March 14 (2 months ago). You can read very good tech posts here, here, here and here and I suggest you also to follow on twitter Hacker Fantastic and  Malware Tech.

Here I try to summarize my approach to the news, mainly highlighting what we did  in my company in the past months and how we monitored WCry from our SOC (Security Operation Center).

There was (and there is also now) a lot of hysteria, but for people like me that work in a SOC this is not an acceptable mood; you need to relax, really understand what’s happening and verify that what you did before is enough and, if not, apply emergency countermeasures. Continue reading “The WannaCry journey from a SOC point of view”

[ITA] Di ritorno da HackInBo Spring Edition 2017

#HiB17
#HiB17

[ Video del mio intervento ]

Il 6 e 7 Maggio ho partecipato come relatore alla Spring Edition di HackInBo e per me sono stati tre giorni molto molto intensi e carichi di emozioni.

Prima di tutto orgogliosamente abbiamo raccolto 1700€ per i progetti della Onlus “Non Basta un Sorriso“; questo è il vero successo di questa edizione (il target prefissato era di 1200€). Kudos a Gianluca Varisco che si è trasformato in chierichetto acaro e ha raccolto le offerte da tutta la platea (quasi 500 persone). Bravi tutti!!!!

Poi i necessari ringraziamenti a Mario Anglani, instancabile organizzatore, e a tutti i ragazzi dell’organizzazione (povero Riccardo che mi ha sopportato più degli altri). Questa volta il gadget per i partecipanti era una bottiglia di birra al miele (e coordinato boccale) prodotta dal birrificio Valsusa in collaborazione con la Onlus Educatamente. Per tutti i partecipanti poi a disposizione uno stand per degustare la suddetta birra gratuitamente.

HiB beer
HiB beer

Le slides del mio intervento “L’evoluzione del SOC di un’infrastruttura critica” sono state pubblicate insieme a quelle di tutti gli altri relatori sul sito di HackInBo e le riporto anche qui di seguito.

Insieme a me hanno presentato in rigoroso ordine di apparizione 🙂 Continue reading “[ITA] Di ritorno da HackInBo Spring Edition 2017”

[ITA] HackInBo Spring Edition 2017

HackInBo
HackInBo

[ Qui potete trovare slides e video del mio intervento ]

Il 6 e 7 Maggio prossimi parteciperò come relatore ad HackInBo, un evento sulla Sicurezza Informatica totalmente gratuito che si svolge due volte l’anno a Bologna, ed organizzato in maniera del tutto volontaria dal buon Mario ed il suo staff.

HackInBo si differenzia in maniera netta dagli eventi organizzati qua e la dai vari vendor ed integratori di soluzioni di Sicurezza in quanto viene “dal basso”, è organizzato cioè da un gruppo di amici che lo fa per pura passione. Per dire: gli sponsor non possono parlare, saranno ovviamente (e giustamente) ringraziati ma l’unico vantaggio è il posto in prima fila. Continue reading “[ITA] HackInBo Spring Edition 2017”

Configure Linux High Availability Cluster in Ubuntu with Corosync and DRBD file sync

Synchronization by Taxydromos69
Synchronization by Taxydromos69

I already wrote how to configure a basic High Availability Ubuntu cluster. The steps to setup a basic cluster are detailed in the previous post, so please read the post if you don’t know how to make the cluster up&running. Same conventions are used here.

One of the topic I didn’t covered on the old post was “application replication/synchronization between the nodes“. Now it’s time to show you how to keep in sync files between cluster nodes, using DRBD software. DRBD is a powerful component of Linux kernel and is designed to keep in sync data via TCP/IP between nodes volumes. In this post we will setup a clustered freeradius service that sync /etc/freeradius/clients.conf file between nodes. Continue reading “Configure Linux High Availability Cluster in Ubuntu with Corosync and DRBD file sync”

Fix OTRS compatibility problems with Internet Explorer via Active Directory GPO

OTRS4 just works with Firefox and Chrome/Chromium but I had a lot of trouble trying to allow people that use Microsoft Internet Explorer to work with OTRS.

Pietro Forti on flickr
Interoperability

Why? Because IE forces by default Compatibility View mode for Intranet web sites and – of course – OTRS is in my company Intranet. With this option forced by IE, OTRS don’t work. I don’t want to go deeper why IE uses Compatibility View mode for Intranet, it’s something legacy and crazy, but a solution exists (or at least works for me now). Continue reading “Fix OTRS compatibility problems with Internet Explorer via Active Directory GPO”

Block Flash content on Squid proxy

No more flash
No more flash

One of the trending topic I discuss regularly with my company IT department is the need to block Flash content on our navigation proxies.

As a Security people I have no doubt about, Flash must be blocked. Period.

Because I manage some Squid proxy I made this simple and effective configuration in squid.conf  file. Continue reading “Block Flash content on Squid proxy”