SPAM, VIRUSES AND PHISHING, OH MY! Michael Starks, CISSP, CISA ISSA Fellow 10/08/2015
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1 SPAM, VIRUSES AND PHISHING, OH MY! Michael Starks, CISSP, CISA ISSA Fellow 10/08/2015
2 The Usual Players Indebtedness for driving on toll road Transaction receipts Notice to appear
3 Major and Emerging Trends Large increase in Word macro malware AV doesn t detect Targeted phishing Malware hosted on file sharing sites Search engine redirect Small business site compromise New vanity name use Bitcoin extortion
4 Initial landing page of phishing campaign. URL is actually different than the one in the . Notice that they ask for address and phone number. The phone number is so they can control the account recovery process
5 After you enter these data, the page redirects here. This is where they capture your Google account password
6 Finally, a redirect to the real Google page so you are less likely to be suspicious that your account was just been Pwned. Attacker then logs into real account and continues campaign
7 DocuSign phishing campaigns on the rise
8 Fake scan with malicious Word document. From domain often spoofed to match target domain
9 Fake fax with malicious Word document
10 with domains in body ending in.ru and.cn always malicious
11 Malicious JavaScript in zip file
12 Phishing s often contain links to several different compromised sites, making response a challenge
13 Both attackers and spammers marketers use dotted-quad IPs, making blocking a challenge
14 IP address leak
15 Targeted phishing with link pointing to URL shortener, then to file sharing site
16 Attack from Bulgaria. Attachment was named SEC_Request_Eng_1_ _NS_MC_companyname. zip. and was encrypted with a simple password, which they sent in another to lend legitimacy to the scam
17 Targeted phishing after customer Gmail account was compromised. No links and no attachments
18 Targeted campaign with pretexting and multiple lesserknown file sharing sites
19 Search redirect to compromised or file sharing site
20 How the search engine redirect works Attacker compromises site or hosts malicious file on file sharing site Attacker computes usg= hash and constructs Google URL Security aware user believes link is safe and clicks. Redirect happens with no warning. User is Pwned Phishing campaign begins, with links to Google TLD More info:
21 Countermeasures
22 Develop a Policy for Macros Sandbox technology Quarantine Whitelist, rather than blacklist Group Policy to disable ability to enable Cryptographically signed internal documents
23 Aggressively Block Executable Content Not just.exes JavaScript, ActiveX, Flash and Java.MSI,.BAT..REG,.PS, etc.. Strip script elements Scan within archives Beware of nested archives Block password-protected archives, if possible
24 Security Awareness Some threats cannot be detected by filters Phish your users Communicate intent. Make users your ally, not your enemy Start with simple campaigns and progress Monthly seems to be the sweet spot Develop KPIs Focus on repeat offenders Build relationships. Encourage users to ask about suspicious s. BE NICE!
25 Consider SPF, DKIM and DMARC SPF: Sender Policy framework, tells others which mail servers are authorized to send for your domain. DKIM: Domain Keys Identified Mail, uses encryption and DNS to verify an sender and that it was not altered in transit DMARC: Domain based Message Authentication, Reporting and Conformance. Builds on SPF and DKIM and implements a policy and reporting system around them Source:
26 Use DLP In Reverse DLP is often used to inspect outbound mail Create custom dictionaries with regexes and near terms Take a policy based action on matches Beware of false-positives and possible delays for releasing legitimate mail
27 Simple regexes for common attacks Russian and Chinese domains: https?:\/\/([\da-z\.-]+)\.ru($ [\/]) https?:\/\/([\da-z\.-]+)\.cn($ [/]) Dotted quad IP (simple) :\/\/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} URL with another URL as a parameter https?:\/\/([\da-z\.-]+)\.([a-z\.]{2,63})\/url\?q=https? UNC path file:\/\/[\\]{0,2}([\da-z\.-]+){1,253}
28 Questions? (five bucks each)
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