In case of future versions without a known hash, FortiEDR integrates with cloud-based AI and ML resources as well as employing online sandboxing to identify malicious and suspicious files. FortiEDR detects the IcedID payload as a malicious file based on hash reputation and stops the executable loading process. When the bat file executes the hidden dll file using rundll32.exe. Obfuscated and de-obfuscated data in the bat file can be seen in the Figure 3 below.įigure 3 Obfuscated (left) and de-obfuscated (right) bat file contents It is observed that different samples of the malware can have different names of the hidden folder, bat file, dll file and these appear to be programmatically generated per build. This matches the name of the dll in the hidden folder.
When we analyzed and de-obfuscated the batch file the command executed by the file was “rundll32 \tempting.dll #1”. The contents of these bat files are typically obfuscated with basic variable substitution and function nesting in order to hide the commands executed by the bat file.
#Pestudio entropy iso#
When the victim executes the ‘document.lnk’ file this lnk file will execute a cmd process to run the bat file in the hidden folder of mounted iso drive. These files and folder structure can be seen in Figure 2 below. The document.lnk file has icon of a folder to trick user into opening the lnk file. This matches previously reported IcedID payloads analyzed by the FortiGuard team. In the case of the analyzed IcedID iso file when user opens it by double clicking in explorer user sees only document.lnk file. iso file as a removable drive (typically a CD drive) and open it in the Windows Explorer.
#Pestudio entropy windows 10#
iso file is opened on Microsoft Windows 10 and above by-default Windows will mount the.
This iso file contains a lnk file and a hidden folder which contains a bat file and one dll file. IcedID In this campaign the victim receives a phishing email containing an. The most current IcedID campaign observed by the FortiGuard Responder team is initiated through a phishing campaign using a malicious attachment (T1566.001: Phishing: Spearphishing Attachment ). Since malware is using iso files, this helps it bypass Mark-of-the-Web controls and run without giving any warning to user.įigure 1 IcedID Attack Diagram Initial Execution iso files containing Windows lnk file, a Windows batch file (.bat) and malicious dll file. However, in the latest versions the attachments are.
#Pestudio entropy download#
Previous versions of IcedID used Microsoft office files with embedded VBA macros to download the first stage dll. IcedID is typically distributed through phishing campaigns and has reportedly been distributed as a second stage payload through other distribution tools such as Emotet. This can also act as dropper for other malware. IcedID aka BokBot, is a banking trojan, this trojan gathers financial information of the victim including login information of online banking.
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