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September 22, 2023
Severity High Analysis Summary Ducktail Malware is a malicious program designed by hackers to infiltrate computers and networks globally. Ducktail malware is typically delivered through a […]September 22, 2023Severity Medium Analysis Summary First discovered in 2016, Revenge RAT is a remote access trojan (RAT) designed to give an attacker complete control over an infected […]September 22, 2023Severity High Analysis Summary The Konni APT (Advanced Persistent Threat) group is a cyber espionage group that has been active since at least 2014. It is […]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
September 22, 2023Severity High Analysis Summary Ducktail Malware is a malicious program designed by hackers to infiltrate computers and networks globally. Ducktail malware is typically delivered through a […]September 22, 2023Severity Medium Analysis Summary First discovered in 2016, Revenge RAT is a remote access trojan (RAT) designed to give an attacker complete control over an infected […]September 22, 2023Severity High Analysis Summary The Konni APT (Advanced Persistent Threat) group is a cyber espionage group that has been active since at least 2014. It is […]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 – OpenSMTPD Vulnerability (CVE-2020-8794) Can Lead to Root Privilege Escalation and Remote Code Execution
March 13, 2020Rewterz Threat Alert – Coronavirus Campaigns – KBot, Azorult, CoronaVirus Ransomware, MBR Wiper
March 13, 2020
Severity
High
Analysis Summary
GuLoader is a downloader written partly in Visual Basic 6 and originally seen being used to deliver Parallax RAT. Multiple threat actors are currently using it to download a variety of RATs and information stealers. The executable is typically delivered either embedded in an ISO or RAR file or via direct download from cloud hosting platforms, such as Google Drive or Microsoft OneDrive. Once downloaded, the VB6 wrapper decrypts the shellcode that provides the main functionality. In order to do this while making analysis more difficult, the loader leverages sophisticated injection techniques. Once decrypted, the shellcode downloads a PE executable from a remote URL with a filename in the pattern of “_encrypted_XXXXXX.bin” where “XXXXXXX” are hexadecimal digits. The downloaded file is XOR-encoded with a XOR key stored in the GuLoader shellcode. Examples of dropped payloads include Agent Tesla/Origin Logger, FormBook, NanoCore RAT, Netwire RAT, Remcos RAT, Ave Maria/Warzone RAT and Parallax RAT.
Impact
- Unauthorized Remote Access
- System Takeover
- Credential Theft
- Command Execution
- Information Theft
Indicators of Compromise
Domain Name
- droptop1[.]com
- droptop2[.]com
- droptop3[.]com
- droptop4[.]com
- droptop5[.]com
- droptop6[.]com
- droptop7[.]com
- droptop8[.]com
- droptop9[.]com
- droptop10[.]com
MD5
- 913fc7a8a80e209997ad142ffce2d619
- b5479869c1ae14084526161cc002036c
SHA-256
- e8f8cc178425c55c03c76d0a2a11918371bba8f2d6f400752ca1cea5e663da2e
- 26f7bfe041a3d8a2b620d0ed2af4e2ef54b004202ec479362939b9154b1c8758
Source IP
185[.]140[.]53[.]134
URL
- https[:]//drive[.]google[.]com/uc?export=download&id=1N8gVOM5p8Ubm1HwolChxHidT7YoN29EE
- https[:]//drive[.]google[.]com/uc?export=download&id=1dtlMCyozUPBepc-AtEdirGENZBpWesAi
Remediation
- Block the threat indicators at their respective controls.
- Do not download unnecessary files from any source, whether emails or cloud hosting platforms.