Rewterz Threat Alert – STRRAT Malware – Active IOCs

December 21, 2022

Severity

High

Analysis Summary

Experts at the German cybersecurity firm identified the Java-based StrRAT malware in June 2020. This malware uses plugins to grant the attacker remote access. This malware steals login credentials from browsers and email clients, logs keystrokes, and exploits vulnerable Windows operating systems remotely. The malware adds the file extension (.crimson) to Notepad to show a bogus ransom message. STRRAT malware supports the browsers Firefox, Chrome, Foxmail, Outlook, Internet Explorer, and Thunderbird.
STRRAT permits threat actors to remotely control compromised machines/computers. According to research, this RAT can be used to run commands that let users upload files, download files, delete files, open files, restart computers, and carry out a variety of other tasks.
Furthermore, users who have the STRRAT installed on their computers run the risk of experiencing issues with online privacy, surfing security, financial loss, identity theft, account lockout, system infection with further infections, etc.

Impact

Unauthorized access
Information theft
Exposure of sensitive data

Indicators of Compromise

MD5

fb8ea8a407cc8a1a846d454a30bba3cd
4bb307f45c90b67e623e6e5a586c892c
c642cd645cce5ae2ca8edf526a6197e2

SHA-256

a5b9228892566983d00f37c99daf610d31a538e949c4f5d9eeda8ff57c1cf162
a445376b6f138af236eb753fb1d78bfa9c190605986b7def8e7823153ee94b82
34bd0e474627ce365ab235e1f7d0f3253360a044a1dcc0918caa8d271698bb33

SHA-1

8b2b82b7dae11460b4f304aa9696903c92282e98
7f3f86bec06a00215974f768209bac4e89953257
d32536e936b9588838e8d3e06194033ec7b1773c

Remediation

Block all threat indicators at your respective controls.
Search for IOCs in your environment.
Passwords – Ensure that general security policies are employed including: implementing strong passwords, correct configurations, and proper administration security policies.
Admin Access – limit access to administrative accounts and portals to only relevant personnel and make sure they are not publicly accessible.
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 in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets