Rewterz Threat Alert – Earth Preta aka Mustang Panda APT Group – Active IOCs

Severity

High

Analysis Summary

MustangPanda, aka Bronze President and TA416, has been active since at least 2012. This threat actor targeted government agencies, think tanks, NGOs, and even Vatican-affiliated religious institutions in the United States and Europe. Asian countries, such as Taiwan, Hong Kong, Mongolia, Tibet, and Myanmar, were the main focus of the past campaigns. The group is notorious for creating phishing lures based on current events that might interest its target, for example, the COVID-19 pandemic, political subjects, and most trending issues like Russian-Ukrainian cyber warfare.

The Trojan application PlugX has been the most popular malicious implant utilized by Mustang Panda and is still the preferred spying weapon for the group. The recent Mustang Panda activity involves the use of DLL side-loading to deliver PlugX. The initial infection vector is an executable downloaded from a remote URL. The executable is responsible for installing the malware by dropping the required files (a DLL loader, a legitimate binary, and the PlugX payload) onto the system. The legitimate binary is the Adobe CEF Helper which is vulnerable to DLL side-loading. When the installer runs the legitimate binary, the dropped DLL is loaded. This DLL is the loader for the final payload. First, it reads a hardcoded .dat file that contains the XOR key for decrypting the final payload, then it performs the decryption and loads the malware into memory. Once running in memory, the PlugX payload can decrypt its configuration data, which includes its installation location, the XOR key for C2 communication, and any C2 addresses and ports.

This APT group has been active for many years and is known to use a variety of tactics and techniques to compromise target systems, including spear-phishing campaigns, custom malware, and exploiting vulnerabilities in popular software. MustangPanda is considered to be one of the more sophisticated APT groups, and it is known for its ability to maintain a persistent presence within target networks and exfiltrate large amounts of sensitive data without being detected.

Impact

• Information Theft
• Exposure To Sensitive Data

Indicators of Compromise

MD5

• 602d71d51d266c805b8afd4289851218

SHA-256

• 02f4186b532b3e33a5cd6d9a39d9469b8d9c12df7cb45dba6dcab912b03e3cb8

SHA-1

• acee43e0e5fac81b299dfc9558ab4163ebb50c43

URL

• http://123.253.32.71/WindowsUpdate.exe
• http://123.253.32.71/EACore.dll

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls.
• Emails from unknown senders should always be treated with caution.
• Never trust or open links and attachments received from unknown sources/senders.
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Enable antivirus and anti-malware software and update signature definitions promptly. Using multi-layered protection is necessary to secure vulnerable assets.