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March 22, 2023Severity Medium Analysis Summary Mekotio is a banking trojan that targets users in Latin America and Europe. It is primarily distributed via phishing emails and infected […]March 22, 2023Analysis Summary Overview – 23rd Mar – A Big Day – As we approach the 23rd of March, Pakistan Day, organizations and individuals should be aware […]March 22, 2023Severity High Analysis Summary CVE-2023-28684 CVSS:7.1 Jenkins remote-jobs-view-plugin Plugin could allow a remote authenticated attacker to obtain sensitive information, caused by improper handling of XML external […]Threat Insights
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Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
March 22, 2023Severity Medium Analysis Summary Mekotio is a banking trojan that targets users in Latin America and Europe. It is primarily distributed via phishing emails and infected […]March 22, 2023Analysis Summary Overview – 23rd Mar – A Big Day – As we approach the 23rd of March, Pakistan Day, organizations and individuals should be aware […]March 22, 2023Severity High Analysis Summary CVE-2023-28684 CVSS:7.1 Jenkins remote-jobs-view-plugin Plugin could allow a remote authenticated attacker to obtain sensitive information, caused by improper handling of XML external […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Rewterz Threat Alert – Buhtrap Group Recent Activity
July 17, 2019Rewterz Threat Alert – Sea Turtle Adopts New DNS Hijacking Techniques
July 18, 2019
Severity
Medium
Analysis Summary
A new, fully undetected Linux backdoor implant, containing rarely seen functionalities with regards to Linux malware, targeting desktop users. The evidence shows operational similarities between this implant and Gamaredon Group.
Gamaredon Group is an alleged Russian threat group. It has been active since at least 2013, and has targeted individuals likely involved with the Ukrainian government. Gamaredon Group infects victims using malicious attachments, delivered via spear phishing techniques. The group’s implants are characterized by the employment of information stealing tools—among them being screenshot and document stealers delivered via a SFX, and made to achieve persistence through a scheduled task.
Hosting Similarities
The operators of EvilGnome use a hosting provider that has been used by Gamaredon Group for years, and continues to be used by the group.
Technical Analysis
Deployment with Makeself SFX
This implant is delivered in the form of a self-extracting archive shell script created with makeself:
“makeself.sh is a small shell script that generates a self-extractable compressed tar archive from a directory. The resulting file appears as a shell script (many of those have a .run suffix), and can be launched as is. The archive will then uncompress itself to a temporary directory and an optional arbitrary command will be executed (for example an installation script). This is pretty similar to archives generated with WinZip Self-Extractor in the Windows world.”
As can be observed in the illustration above, the makeself script is instructed to run ./setup.sh after unpacking.
Using makeself’s options, we are able to instruct the script to unpack itself without executing:
The archive contains four files:
- gnome-shell-ext – the spy agent executable
- gnome-shell-ext.sh – checks if gnome-shell-ext is already running and if not, executes it
- rtp.dat– configuration file for gnome-shell-ext
- setup.sh – the setup script that is run by makeself after unpacking
Impact
- Information steal
- Exposure of sensitive information
Indicators of Compromise
URLs
- clsass[.]ddns[.]net
- gamework[.]ddns[.]net
- kotl[.]space
- rnbo-ua[.]ddns[.]net
- workan[.]ddns[.]net
Malware Hash (MD5/SHA1/SH256)
- 044e14f9a6766d116646914829282fe78784b55d031224a99b1ca68eb099bf30
- 49d967385e4e3a059fab5d6e5a844f7195ab9cf535ce075f5ba296d51036b710
- 6e4989a1b4625042e66c2e92500238ca9b2ed7f6d34d51ecb0c6f9c183e59e96
- 7ffab36b2fa68d0708c82f01a70c8d10614ca742d838b69007f5104337a4b869
- 82b69954410c83315dfe769eed4b6cfc7d11f0f62e26ff546542e35dcd7106b7
- 88b4d7f38d475aaaae4a72b402e65b6dc32cad6411cddff35e025826da08a5f4
- 8a644b1c8173745bf5909c4b53b39a66bd6a45673a2e10ae88b6990a96a77348
- 909a9e67517a49ac10e8859c2efa5a613166f2a36ec8761905e4b5a8c3a90f57
- a21acbe7ee77c721f1adc76e7a7799c936e74348d32b4c38f3bf6357ed7e8032
- a6c5709649eb2d053af82e70aa12b1fc2a8938959066c6bdfa0b92cd0db1fc85
- bfc8f56c28efa2a07844c6f9ff33556de0baf052b5ced421c9bb04a94f3ded0f
- c58168ca5ee709da20355ccd447f760d3fb6b63f372bd4344e0c824cfbc55ff1
- cec6e01b1e3097f8a80b892a091446230a7460292136d53ff12639bc0db82241
- ded4ea9f386226d93f2b5cd2af253bb8e33ca69cb130f5facba7545f142b6e1e
Remediation
It is recommended for the users to check “~/.cache/gnome-software/gnome-shell-extensions” directory for the “gnome-shell-ext” executable.