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Identifying UserForms with Oledump and Olevba
Malware authors often find creative ways to obfuscate and store their data and malicious office documents are no exception. One such...
Josh Stroschein
Feb 28, 20242 min read
526 views


OneNote Malware: Hidden Payloads in Page Versions
While the abuse of OneNote documents is nothing new, a recent document I investigated revealed multiple payloads through the page...
Josh Stroschein
Feb 16, 20242 min read
937 views


How-To: Installing Oledump in Windows
In this video, we’ll look into installing OLEDUMP in Microsoft Windows. Microsoft office documents are a common vehicle used by malware...
Josh Stroschein
Feb 11, 20211 min read
32 views


Emotet Maldoc Analysis – Embedded DLL and CertUtil for Base64 Decoding
On 11/10/2020, AnyRun posted an Emotet maldoc that utilized CertUtil to decode a DLL payload that was used for unpacking and running the...
Josh Stroschein
Dec 2, 20201 min read
27 views

Maldoc drops DLL and executes via ExecuteExcel4Macro
Behavioral information is a key indicator used to determine if an office document is malicious or not. I’ve recently seen a series of...
Josh Stroschein
Mar 25, 20203 min read
14 views

Maldoc uses Windows API to perform process hollowing
A favorite technique by malware authors is to use macros in their office documents to utilize a normal system executable and replace the...
Josh Stroschein
Mar 18, 20205 min read
52 views

Maldoc uses RC4 to hide PowerShell script, retrieves payload from DNS TXT record
Malware authors are constantly coming up with new and clever techniques to help avoid detection. In this maldoc, the authors employed...
Josh Stroschein
Mar 10, 20203 min read
42 views

Malware Analysis – Triaging Emotet (Fall 2019)
This is a summary of initial (triage) analysis of Emotet droppers and the associated network traffic from the fall of 2019. This write-up...
Josh Stroschein
Feb 10, 20205 min read
28 views

Anti-Analysis in an Office Document
Please note: This was a blog post I originally authored for Bromium. Due to changes in how they host their blog content, it has fallen...
Josh Stroschein
Jul 15, 20193 min read
7 views

Identifying a User Form in an Office Document
In this post, we will be looking into ways to identify and analyze the presence of a user form in an office document. As I discussed in a...
Josh Stroschein
Jun 28, 20195 min read
9 views

Analyzing Malicious Office Documents with OLEDUMP
Microsoft office documents are a common vehicle used by malware authors to deliver malware. These documents, used for malicious purposes,...
Josh Stroschein
Jun 4, 20198 min read
218 views
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