Friday, December 8, 2023

Patched MS Office RCE Vulnerability Again Abused Windows Installer and Delivering a Keylogger

A Patched remote code execution Microsoft Office Vulnerability ( CVE-2017-11882) abusing again and using it for spreading a variety of  Malware such as  FAREIT, Ursnif and a Keylogger Loki info stealer that is used for stealing Crypto wallet password.

In this case, some of the uncommon methods has been reused by helping of  Windows Installer service Windows.

Previous Exploitation did using the Windows executable mshta.exe to run a Powershell script. but this attack using uses msiexec.exe  Exploit this Vulnerability.

Various other methods such as Wscript, Powershell, Mshta.exe, Winword.exe is very common methods and security software are easily monitoring these methods if other malware is abusing these function.

But use of msiexec.exe to download malware is not something regular way to abuse the victims.

Also Read: Beware: Dangerous Android Ransomware “LOKIBOT” Attacked Many Users & Earned $1.5Million From Compromised Victims

How Does this Office Vulnerability has Abused

The initial level of infection spreading via spam email Campaign that contains a malicious attachment file that claimed as a payment copy with order confirmation body content.

Body content is Written in Korean language and given fake warning as,” please check if your PC may be infected by a virus or malicious codes”.

An attacked Document file which claimed as payment copy  is an actual  exploit of CVE-2017-11882.


Later it uses the command that will instruct to Exploit this vulnerability and it leads to download and install the  malicious MSI package labeled zus.msi through Windows Installer.

According to Trend Micro, Later MSIL or Delphi binary will be installed by Windows Installer (msiexec.exe) and some time based on the MSI package it may contain either a heavily obfuscated Microsoft Intermediate Language (MSIL) or Delphi binary file, which then acts as a loader for the actual payload.

Moreover, it using obfuscation to evade the antivirus scanners and being detected by an anti-malware scanner is more difficult since its using heavily obfuscated MSIL or Delphi binary.

In this analyse it usually download and install the  LokiBot Keylogger variant but it capable to download and execute other malware as well.


— Always keep your OS and software updated
— Train staff never open attachments or click on a URL in unsolicited e-mails
— Use Anti Spam Gateway such as Comodo Anti spam Gateway for defense against spam, phishing emails, and virus-infected attachments
— Turn on Your Firewall
— Limit the user Privilege
— Use caution when clicking on links to web pages


Latest articles

Exploitation Methods Used by PlugX Malware Revealed by Splunk Research

PlugX malware is sophisticated in evasion, as it uses the following techniques to avoid...

TA422 Hackers Attack Organizations Using Outlook & WinRAR Vulnerabilities

Hackers exploit Outlook and WinRAR vulnerabilities because these widely used software programs are lucrative...

Bluetooth keystroke-injection Flaw: A Threat to Apple, Linux & Android Devices

An unauthenticated Bluetooth keystroke-injection vulnerability that affects Android, macOS, and iOS devices has been...

Atlassian Patches RCE Flaw that Affected Multiple Products

Atlassian has been discovered with four new vulnerabilities associated with Remote Code Execution in...

Reflectiz Introduces AI-powered Insights on Top of Its Smart Alerting System

Reflectiz, a cybersecurity company specializing in continuous web threat management, proudly introduces a new...

SLAM Attack Gets Root Password Hash in 30 Seconds

Spectre is a class of speculative execution vulnerabilities in microprocessors that can allow threat...

Akira Ransomware Exploiting Zero-day Flaws For Organization Network Access

The Akira ransomware group, which first appeared in March 2023, has been identified as...
BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.

Endpoint Strategies for 2024 and beyond

Converge and Defend

What's the pulse of Unified Endpoint Management and Security (UEMS) in Europe? Join us live to uncover the strategies that are defining endpoint security in the region.

Related Articles