An unidentified group of hackers is utilizing a brand new fileless assault method, dubbed Kraken, that abuses the Microsoft Home windows Error Reporting (WER).

Malwarebytes researchers Hossein Jazi and Jérôme Segura have documented a brand new fileless assault method, dubbed Kraken, that abuses the Microsoft Home windows Error Reporting (WER) service. The hacking method was employed by an unidentified hacking group to keep away from detection.

“On September 17th, we found a brand new assault known as Kraken that injected its payload into the Home windows Error Reporting (WER) service as a protection evasion mechanism.” states the weblog publish printed by Malwarebytes.

“That reporting service, WerFault.exe, is often invoked when an error associated to the working system, Home windows options, or purposes occurs.”

Menace actors employed anti-analysis and evasion methods, together with, code obfuscation and performing some checks for sandbox or debugger environments.

The menace actor that employed the Kraken method, probably an APT group, launched a phishing assault that used messages with a .ZIP file attachment.

The .ZIP archive, titled, “Compensation handbook.doc,” claims to comprise info regarding employee compensation rights.

Microsoft Windows Error ReportingSecurity Affairs Abuses Kraken Fileless Attack Technique

Upon opening the doc, a macro is triggered, the malicious code makes use of a customized model of the CactusTorch VBA module to carry out a fileless assault.

Not like CactusTorch VBA that specifies the goal course of to inject the payload into it inside the macro, however the menace actor behind this marketing campaign modified the macro and specified the goal course of inside the .Internet payload.

The payload loaded is a .Internet DLL internally named “Kraken.dll” and compiled on 2020-06-12.

This DLL acts as a loader that injects an embedded shellcode into WerFault.exe. In keeping with the consultants the loader has two most important courses named “Kraken” and “Loader“.

The final shellcode within the assault chain consists of a set of directions that make an HTTP request to a hard-coded area to obtain a malicious payload and inject it right into a course of.

On the time of the evaluation, the hard-coded goal URL of the malware was not reachable making it inconceivable to attribute the Kraken method to a selected menace actor. Nevertheless, Malwarebytes researchers have discovered some hyperlinks with APT32, which is a Vietnam-linked cyberespionage group.

The APT32 group has been energetic since at the very least 2012, it has focused organizations throughout a number of industries and international governments, dissidents, and journalists.

Since at the very least 2014, consultants at FireEye have noticed APT32 focusing on international companies with an curiosity in Vietnam’s manufacturing, shopper merchandise, and hospitality sectors. The APT32 additionally focused peripheral community safety and expertise infrastructure companies, and safety companies that will have connections with international buyers.

Malwarebytes’s report consists of Indicators of Compromise (IoCs).

Pierluigi Paganini

(SecurityAffairs – hacking, Kraken)

 


 

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