Rewterz Threat Alert – Agent Tesla Malware – Active IOCs

Severity

Medium

Analysis Summary

Agent Tesla is a very popular spyware Trojan built for the.NET framework. Since its initial appearance in 2014, this has been deployed in many forms, most notably via phishing attempts. AgentTesla is renowned for stealing data from a variety of target workstations’ apps, including browsers, FTP clients, and file downloaders. Agent Tesla grabs data from the victim’s clipboard, logs keystrokes, captures screenshots, and gains access to the victim’s webcam. It has the ability to terminate running analytic programs and anti-virus applications. In an attempt to disguise its capabilities and activities from researchers, the malware also runs simple checks to see if it is operating on a virtual machine or in debug mode. This can spread through various means, including phishing emails, malicious software downloads, or drive-by downloads. Once installed, it runs in the background and can bypass traditional security measures, making it a significant threat.

The malware employs various techniques to evade detection and analysis, including code obfuscation, anti-virtual machine and sandbox detection, and encryption of communication channels. It may also employ polymorphic techniques to generate unique variants to avoid detection by traditional antivirus solutions. Agent Tesla has been observed targeting individuals, small businesses, and organizations across multiple sectors, including finance, healthcare, manufacturing, and government. It is a global threat, impacting users and organizations worldwide.

Organizations and individuals can protect themselves against Agent Tesla and other types of malware by implementing strong cybersecurity measures, such as using up-to-date antivirus software, avoiding suspicious emails and attachments, and keeping all software and operating systems up to date with the latest security patches. Additionally, user education and awareness can be an effective tool in preventing successful phishing attempts and other types of social engineering attacks.

Impact

• Sensitive Data Theft
• Credentials Theft

Indicators of Compromise

MD5

• 8a1f3bd39aaf55d7a31ad4e86ca2a7ad
• 9608e5332caeeeb2d5b22951ab2815a5
• 19f72dddd2eaf0cdfffb42c727a7b5b2
• 9b2f5ef32b9412d5bbf8249d61456d19
• 5313d6e64482c697ea11c93b462cfc06

SHA-256

• a9b4d76d4ce03f4f076da2b44e771ce841a80a50363d3328a5fca8ee0ceaf7c4
• 7a3f9e8c7610b1b6bc6433234fcc92a41834657cbe2f0bf74442d772df664568
• 710fa86210820e8990d72fde020d01022c213ef03c036d1ed1ce96e8a07eb9ce
• 857d75d1fc8d218e230d8721329c3fc1f34c4fc8a3910dff8505fb18ce8f3a73
• 71e7dfba6cd94d1be1096f5d2ac0938c3bc4bedbe649f422eef44f9821f170ab

SHA-1

• 4c26a13700d7160d24696824f7f299435dbc5c1d
• 9e6df259ca094ae71bb5e0cbbef67ef565a4c14b
• 949b73557bef451c0ca6dc097584f62d5467064e
• 07b43f5db865740d215322c59827dd386905cde7
• 335505545c66a20f80729d9770c140d5e6a6fd6a

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
• Emails from unknown senders should always be treated with caution.