Category: SANS Internet Storm Center, InfoCON: green

CrowdStrike Outage Themed Maldoc, (Mon, Jul 29th)

I found a malicious Word document with VBA code using the CrowdStrike outage for social engineering purposes. It's an .ASD file (AutoRecover file). My tool oledump.py can analyze it: This article has been indexed from SANS Internet Storm Center, InfoCON:…

Quickie: Password Cracking & Energy, (Sun, Jul 28th)

When Johannes talked about my diary entry “Protected OOXML Spreadsheets” on his StormCast podcast, he mentioned that I privately shared data on the power consumption of my desktop with a NVIDIA GeForce RTX 3080 GPU when running Hashcat. This article…

Create Your Own BSOD: NotMyFault, (Sat, Jul 27th)

With all the Blue Screen Of Death screenshots we saw lately, I got the idea to write about Sysinternals' tool NotMyFault. This article has been indexed from SANS Internet Storm Center, InfoCON: green Read the original article: Create Your Own…

XWorm Hidden With Process Hollowing, (Thu, Jul 25th)

XWorm is not a brand-new malware family[1]. It's a common RAT (Remote Access Tool) re-use regularly in new campaigns. Yesterday, I found a sample that behaves like a dropper and runs the malware using the Process Hollowing technique[2]. The sample…

“Mouse Logger” Malicious Python Script, (Wed, Jul 24th)

Keylogging is a pretty common feature of many malware families because recording the key pressed on a keyboard may reveal a lot of interesting information like usernames, passwords, etc. Back from SANSFIRE, I looked at my backlog of hunting results and…

CrowdStrike: The Monday After, (Mon, Jul 22nd)

Last Friday, after Crowdstrike released a bad sensor configuration update that caused widespread crashes of Windows systems. The most visible effects of these crashes appear to have been mitigated. I am sure many IT workers had to spend the weekend…

Protected OOXML Spreadsheets, (Mon, Jul 15th)

I was asked a question about the protection of an .xlsm spreadsheet. I've written before on the protection of .xls spreadsheets, for example in diary entries “Unprotecting Malicious Documents For Inspection” and “16-bit Hash Collisions in .xls Spreadsheets”; and blog…

Wireshark 4.2.6 Released, (Sun, Jul 14th)

Wireshark release 4.2.6 fixes 1 vulnerability (SPRT parser crash) and 10 bugs. This article has been indexed from SANS Internet Storm Center, InfoCON: green Read the original article: Wireshark 4.2.6 Released, (Sun, Jul 14th)

16-bit Hash Collisions in .xls Spreadsheets, (Sat, Jul 13th)

A couple years ago, in diary entry “Unprotecting Malicious Documents For Inspection” I explain how .xls spreadsheets are password protected (but not encrypted). And in follow-up diary entry “Maldocs: Protection Passwords”, I talk about an update to my oledump plugin…

Microsoft Patch Tuesday July 2024, (Tue, Jul 9th)

Microsoft today released patches for 142 vulnerabilities. Only four of the vulnerabilities are rated as “critical”. There are two vulnerabilities that have already been discussed and two that have already been exploited. This article has been indexed from SANS Internet…

Handling BOM MIME Files, (Wed, Jun 19th)

A reader contacted me with an eml file (which turned out to be benign) that emldump.py could not parse correctly. This article has been indexed from SANS Internet Storm Center, InfoCON: green Read the original article: Handling BOM MIME Files,…

Video Meta Data: DJI Drones, (Sun, Jun 16th)

Many years ago, I wrote about the EXIF data in pictures taken with Smartphones. Smartphones often record extensive meta data including GPS and accelerometer data. This article has been indexed from SANS Internet Storm Center, InfoCON: green Read the original…

Overview of My Tools That Handle JSON Data, (Sat, Jun 15th)

I wrote a couple of diary entries showing my tools that produce and consume JSON data. Like “Analyzing PDF Streams”, “Another PDF Streams Example: Extracting JPEGs” and “Analyzing MSG Files”. This article has been indexed from SANS Internet Storm Center,…

Microsoft Patch Tuesday June 2024, (Tue, Jun 11th)

Microsoft's June 2024 update fixes a total of 58 vulnerabilities. 7 of these vulnerabilities are associated with Chromium and Microsoft's Brave browser. Only one vulnerability is rated critical. One of the vulnerabilities had been disclosed before today. This article has…

“K1w1” InfoStealer Uses gofile.io for Exfiltration, (Fri, May 31st)

Python remains a nice language for attackers and I keep finding interesting scripts that are usually not very well detected by antivirus solutions. The one I found has a VT score of 7/65! (SHA256:a6230d4d00a9d8ecaf5133b02d9b61fe78283ac4826a8346b72b4482d9aab54c[1]). I decided to call it “k1w1”…

Feeding MISP with OSSEC, (Thu, May 30th)

I'm a big fan of OSSEC[1] for years. OSSEC (“Open Source Security Event Correlator”) is a comprehensive, open-source host-based intrusion detection system (HIDS). It is designed to monitor and analyze system logs, detect suspicious activities, and provide real-time alerts for…