Friday, March 29, 2024

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.

Keylogger

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.

Mitigation

— 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

Website

Latest articles

GoPlus’s Latest Report Highlights How Blockchain Communities Are Leveraging Critical API Security Data To Mitigate Web3 Threats

GoPlus Labs, the leading Web3 security infrastructure provider, has unveiled a groundbreaking report highlighting...

Wireshark 4.2.4 Released: What’s New!

Wireshark stands as the undisputed leader, offering unparalleled tools for troubleshooting, analysis, development, and...

Zoom Unveils AI-Powered All-In-One AI Work Workplace

Zoom has taken a monumental leap forward by introducing Zoom Workplace, an all-encompassing AI-powered...

iPhone Users Beware! Darcula Phishing Service Attacking Via iMessage

Phishing allows hackers to exploit human vulnerabilities and trick users into revealing sensitive information...

2 Chrome Zero-Days Exploited at Pwn2Own 2024: Patch Now

Google has announced a crucial update to its Chrome browser, addressing several vulnerabilities, including...

The Moon Malware Hacked 6,000 ASUS Routers in 72hours to Use for Proxy

Black Lotus Labs discovered a multi-year campaign by TheMoon malware targeting vulnerable routers and...
Balaji
Balaji
BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.

Mitigating Vulnerability Types & 0-day Threats

Mitigating Vulnerability & 0-day Threats

Alert Fatigue that helps no one as security teams need to triage 100s of vulnerabilities.

  • The problem of vulnerability fatigue today
  • Difference between CVSS-specific vulnerability vs risk-based vulnerability
  • Evaluating vulnerabilities based on the business impact/risk
  • Automation to reduce alert fatigue and enhance security posture significantly

Related Articles