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March 25, 2023Severity Medium Analysis Summary GandCrab – a ransomware-as-a-service variant – was discovered in early 2018. At least five versions of GandCrab have been created since its […]March 25, 2023Severity Medium Analysis Summary NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple […]March 24, 2023Severity Medium Analysis Summary CVE-2023-20113 Cisco SD-WAN vManage Software is vulnerable to cross-site request forgery, caused by improper validation of user-supplied input. By persuading an authenticated […]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
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 25, 2023Severity Medium Analysis Summary GandCrab – a ransomware-as-a-service variant – was discovered in early 2018. At least five versions of GandCrab have been created since its […]March 25, 2023Severity Medium Analysis Summary NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple […]March 24, 2023Severity Medium Analysis Summary CVE-2023-20113 Cisco SD-WAN vManage Software is vulnerable to cross-site request forgery, caused by improper validation of user-supplied input. By persuading an authenticated […]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 Advisory – CVE-2019-10974 – NREL EnergyPlus Denial of Service and Code Execution Vulnerability
July 24, 2019Rewterz Threat Advisory – CVE-2018-0105 – Cisco Enterprise License Manager Information Disclosure Vulnerability
July 24, 2019
Severity
Medium
Analysis Summary
A white paper was published by Yoroi exploring the risks that users can encounter when downloading materials from P2P sharing network, such as the Torrent one. They discussed how crooks easily lure their victims to download malware along with the desired content.
Technical Analysis
As anticipated, the file downloaded from the BitTorrent network is an executable. A quick recon revealed it actually is an SFX archive containing several other files.
The archive contains more than a dozen of files. In detail it embeds:
- 16 temporary files used during execution;
- a Visual Basic Script;
- a batch script;
- and a setup file
It is possible to see the SFX configuration file. After the auto-extraction, the first file run is “run.vbs”. Its content is minimal and quickly redirect the execution to a small batch file, “installer.bat” contained in the same folder. Then it runs installer.bat (the filename) with the parameter “0? (WindowStyle hidden, to avoid hidden windows because it may trigger AntiViruses heuristics) and “true” (WaitOnReturn).
The content of “installer.bat” file is also minimal and points to a more complex text file “007.tmp”, later renamed as “007.bat”.
Impact
Exposure of sensitive information
Indicators of Compromise
Malware Hash (MD5/SHA1/SH256)
- 552a4cbd2628d16d1fc910c9fc24bc426cafdf0f755f7b4013484adbc0393ca7
- 73bc41504045e4e6de1b63ec40433afabf316141b1289c69905ee946e1b1a263
- 746d17e8d0b961f0c7733f155152fa54d2610fc6d117217d24f32d3ad370075e
- 7bd25bd3c0f003ffea67c846b4fefd8fb8b4f72d836544d0ef786c5c6c63b422
- a3574e73234e18be8d233c9e3fa3819600fc40341d8be8fc4449e4e73632ad6d
- b6080b2786d2e4ac30207fb2f177046cfd40fa6578c56f3dfd13abab7d62e2ea
- f9b2e61200addf760d7bd157c73201e97257b12d5177837a1bffb98f4064e76a
Remediation
- Always research before downloading any software from internet.
- Always scan your files.
- Always download from the publisher’s site.