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Before yesterdaySANS Internet Storm Center, InfoCON: green

VMware Patch Alert!, (Fri, Oct 25th)

Update Alert!  Patches are out for VMware VCSA (information disclosure in backups and restore) https://www.vmware.com/security/advisories/VMSA-2019-0018.html
  • October 25th 2019 at 16:16
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Wireshark 3.0.6 Released, (Sun, Oct 27th)

Wireshark version 3.0.6 was released.
  • October 27th 2019 at 09:19
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Unusual Activity with Double Base64 Encoding, (Sun, Oct 27th)

This week I found this traffic in my honeypot, my first impression, it didn't look that unusual since Base64 encoding is used quite a bit to encode traffic to a web server. Using CyberChef, I decoded the Base64 portion to see what it was all about only to find out it was further encoded in Base64. Decoding the second Base64 revealed two IP address in it.
  • October 27th 2019 at 12:59
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Using scdbg to Find Shellcode, (Sun, Oct 27th)

I've written a couple of diary entries about scdbg, a Windows 32-bit shellcode emulator.
  • October 28th 2019 at 07:02
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Generating PCAP Files from YAML, (Tue, Oct 29th)

The PCAP[1] file format is everywhere. Many applications generate PCAP files based on information collected on the network. Then, they can be used as evidence, as another data source for investigations and much more. There exist plenty of tools[2] to work with PCAP files. Common operations are to anonymize captured traffic and replay it against another tool for testing purposes (demos, lab, PoC).
  • October 29th 2019 at 07:00
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Keep an Eye on Remote Access to Mailboxes, (Wed, Oct 30th)

BEC or "Business Email Compromize" is a trending thread for a while. The idea is simple: a corporate mailbox (usually from a C-level member) is compromized to send legitimate emails to other employees or partners. That's the very first step of a fraud that could have huge impacts.
  • October 30th 2019 at 09:13
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EML attachments in O365 - a recipe for phishing, (Thu, Oct 31st)

I’ve recently come across interesting behavior of Office 365 when EML files are attached to e-mail messages, which can be useful for any red teamers out there but which can potentially also make certain types of phishing attacks more successful.
  • October 31st 2019 at 10:12
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Tip: Password Managers and 2FA, (Fri, Nov 1st)

I guess many of you use a password manager.
  • November 1st 2019 at 18:24
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Remark on EML Attachments, (Sat, Nov 2nd)

Jan Kopriva's interesting diary entry "EML attachments in O365 - a recipe for phishing" reminded me of another use of EML files for malicious purposes.
  • November 2nd 2019 at 11:33
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You Too? "Unusual Activity with Double Base64 Encoding", (Sun, Nov 3rd)

Last week, Guy wrote a diary entry "Unusual Activity with Double Base64 Encoding" describing unusual scanning activity he sees on his honeypot.
  • November 3rd 2019 at 22:09
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rConfig Install Directory Remote Code Execution Vulnerability Exploited, (Mon, Nov 4th)

Last week, Askar from Shells.Systems published two remote code execution (RCE) vulnerabilities in rConfig [1]. The blog post included details about these vulnerabilities and proof of concept code. Both vulnerabilities are trivially exploited by adding shell commands to specific URLs, and one of the vulnerabilities does not require authentication.
  • November 4th 2019 at 04:27
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Bluekeep exploitation causing Bluekeep vulnerability scan to fail, (Tue, Nov 5th)

I woke up this morning to the long anticipated news that Bluekeep exploitation is happening in the wild.  As some of you may recall, back in August I wrote a diary demonstrating a way to scan for Bluekeep vulnerable devices.  So the next thing I did was check my Bluekeep scan results and was presented with this graph.
  • November 5th 2019 at 02:06
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Getting the best value out of security assessments, (Thu, Nov 7th)

Since my day job is all about hacking, I get a lot of questions (and there appears to be a lot of confusion) about what a vulnerability scan, penetration test or red team assessment is.
  • November 7th 2019 at 10:16
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Microsoft Apps Diverted from Their Main Use, (Fri, Nov 8th)

This week, the CERT.eu[1] organized its yearly conference in Brussels. Across many interesting presentations, one of them covered what they called the "cat’n’mouse" game that Blue and Red teams are playing continuously. When the Blue team has detected an attack technique, they write a rule or implement a new control to detect or block it. Then, the Red team has to find an alternative attack path, and so one… A classic example is the detection of malicious via parent/child process relations. It’s quite common to implement the following simple rule (in Sigma[2] format):
  • November 8th 2019 at 07:02
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Fake Netflix Update Request by Text, (Sat, Nov 9th)

In the past week, I have received texts asking to update my Netflix account information. It is obvious the URL listed in the text isn't Netflix. The text looks like this:
  • November 9th 2019 at 16:36
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Did the recent malicious BlueKeep campaign have any positive impact when it comes to patching?, (Sun, Nov 10th)

After a news of "mass exploitation" of a specific vulnerability hits mainstream media, even organizations that don’t have a formal (or any) patch management process in place usually start to smell the ashes and try to quickly apply the relevant patches. Since media coverage of the recent BlueKeep campaign was quite extensive, I wondered whether the number of vulnerable machines would start diminishing significantly as a result.
  • November 10th 2019 at 10:53
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Are We Going Back to TheMoon (and How is Liquor Involved)?, (Mon, Nov 11th)

Earlier today, we received an email from an analyst for a large corporation. He asked:
  • November 11th 2019 at 19:24
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November 2019 Microsoft Patch Tuesday, (Tue, Nov 12th)

Microsoft today patched a total of 74 vulnerabilities. This patch Tuesday release also includes two advisories. 15 of the vulnerabilities are rated critical.
  • November 12th 2019 at 18:23
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Some packet-fu with Zeek (previously known as bro), (Mon, Nov 11th)

During an incident response process, one of the fundamental variables to consider is speed. If a net capture is being made where we can presumably find evidence that who and how is causing an incident, any second counts in order to anticipate the attacker in the cyber kill chain sequence.
  • November 14th 2019 at 19:42
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SMS and 2FA: Another Reason to Move away from It., (Mon, Nov 18th)

Developing applications around SMS has become very popular, with several companies offering simple to use APIs and attractive pricing to send and receive SMS. One security-related application of these SMS APIs (for the right or wrong reasons) has been simple two-factor authentication. This time, I don't want to talk so much about the security reasons not to use SMS to authenticate to critical systems, but some of the technical changes that are happening with SMS in the US and Canada.
  • November 18th 2019 at 04:55
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Cheap Chinese JAWS of DVR Exploitability on Port 60001, (Tue, Nov 19th)

Looking at some local IP addresses in our database during class this week, I came across a host scanning exclusively for %%port:60001%%. Interestingly, we did see a marked increase in scans for this port in recent weeks. 
  • November 19th 2019 at 17:58
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Gathering information to determine unusual network traffic, (Thu, Nov 21st)

When working with threat intelligence, it's vital to collect indicators of compromise to be able to determine possible attack patterns. What could be catalogued as unusual network traffic? This is all traffic that is not being seen normally in the network, meaning that after building a frequence table all IP addresses shown less than 1% are suspicious and should be investigated.
  • November 21st 2019 at 21:45
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Abusing Web Filters Misconfiguration for Reconnaissance, (Fri, Nov 22nd)

Yesterday, an interesting incident was detected while working at a customer SOC. They use a “next-generation” firewall that implements a web filter based on categories. This is common in many organizations today: Users' web traffic is allowed/denied based on an URL categorization database (like “adult content”, “hacking”, “gambling”, …). How was it detected? 
  • November 22nd 2019 at 06:34
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Local Malware Analysis with Malice, (Sat, Nov 23rd)

This project (Malice) provides the ability to have your own locally managed multi-engine malware scanning system. The framework allows the owner to analyze files for known malware. It can be used both as a command tool to analyze samples and review the results via a Kibana web interface. The Command-Line Interface (CLI) is used to scan a file or directory or can be setup to watch and scan new files when copied into a write only directory.
  • November 23rd 2019 at 21:53
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My Little DoH Setup, (Mon, Nov 25th)

"DoH"[1], this 3-letters acronym is a buzzword on the Internet in 2019! It has been implemented in Firefox, Microsoft announced that Windows will support it soon. They are pro & con about encrypting DNS requests in  HTTPS but it's not the goal of this diary to restart the debate. In a previous diary, he explained how to prevent DoH to be used by Firefox[2] but, this time, I'll play on the other side and explain to you how to implement it in a way to keep control of your DNS traffic (read: how to keep an eye on DNS request performed by users and systems). For a while, I had the idea to test a DoH configuration but I had some requirements:
  • November 25th 2019 at 08:34
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Lessons learned from playing a willing phish, (Tue, Nov 26th)

Replying to phishing e-mails can lead to some interesting experiences (besides falling for the scams they offer, that is). Since it doesn’t require a deep technical know-how or any special expertise, it is something I recommend everyone to try out at least once, as it can lead to some funny moments and show us that the phishing trade doesn’t always operate in the way we might expect it to.
  • November 26th 2019 at 11:07
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Finding an Agent Tesla malware sample, (Wed, Nov 27th)

I was browsing through the Any Run sandbox looking through the public submissions of malware with pcaps of infection traffic from Tuesday 2019-11-26.  I found this one, and it's tagged agenttesla.  Agent Tesla is an information stealer.  Based on the file name, this Agent Tesla malware sample may have been disguised as an installer for Discord.
  • November 27th 2019 at 00:29
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ISC Snapshot: Search with SauronEye, (Fri, Nov 29th)

SauronEye is a search tool built to aid red teams in finding files containing specific keywords.
  • November 29th 2019 at 03:11
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Next up, what's up with TCP port 26?, (Mon, Dec 2nd)

Whenever I sign up for another shift, if I don't already have a diary topic in mind, I take a look at the top 10 ports in the dashboard when I login to isc.sans.edu. For the last few weeks, I've noticed %%port:26%% showing up, so I decided to see if I could figure out what was going on there.
  • December 2nd 2019 at 19:37
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Analysis of a strangely poetic malware, (Wed, Dec 4th)

Although given its name, one might expect this diary to be about the Elk Cloner[1], that is not the case. The malware we will take a look at is recent and much simpler, yet still interesting in its own way.
  • December 4th 2019 at 07:50
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