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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
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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 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.
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Rewterz Threat Advisory – CVE-2018-10933 – libSSH authentication bypass vulnerability
October 19, 2018Rewterz Threat Advisory – CVE-2018-3253 – Oracle ‘Virtual Directory Manager’ Vulnerability
October 23, 2018
A new DNS hijacking campaign called GhostDNS is observed in Brazil, that redirects e-banking customers to phishing webpages.
IMPACT: MEDIUM
PUBLISH DATE: 22-10-2018
OVERVIEW
A DNS hijacking campaign arising from Brazil with the name GhostDNS was found to be affecting over 100,000 compromised home routers. The campaign aimed to redirect Brazilian e-banking customers to specially crafted phishing web pages.
Security researchers at Cybereason found out that trusted and signed binaries of companies like HP, NVIDIA, RealTek and VMware were also being misused. The attackers hid malicious code in them which was to be loaded by hijacking a DLL. They also went as far as directly injecting it into trusted programs.
ANALYSIS
To operate quietly, attackers are abusing trusted and signed binaries, and are hijacking DLLs, to utilize trusted programs as their “malware launchers”. The PowerShell scripts used for execution in this campaign are identical to those previously associated with Brazilian and Chilean campaigns. Some Portuguese references found in the scripts provide evidence that the attackers have Portuguese links.
A reference in an RTF file to two entries by the name of “Equation.3” indicates that attackers are exploiting a Microsoft Office Memory Corruption Vulnerability in their attacks (CVE-2017-11882).
The vulnerability is one of remote code execution which when exploited lets the attacker run arbitrary code in the context of the current user. This means that an attacker could take control of the affected system and install programs; view, change, or delete data; or create new accounts with full user rights if the current user is logged in with administrative privileges.
A list of threat indicators is available to make sure systems are fully protected against these threat indicators.
THREAT INDICATORS
Following is a list of threat indicators associated with the campaign.
- e0247073e68070413235a8aa92008de2970e1bf0
- 9B6016D9523DE39BF2E5F854549CED9A3F35BE85
- 4F66783ACE879E221C0DB62A92C21FFE587F7B3B
- 5C1AD7C4CD06316172E4AA579C9EB9159C72DBAA
- 08359247B1F9069AA07F015921035F362185D665
- 87358CC245FDF172EC532C2B1C729E1A6F9CB18E
- 9422FAFBC54983EFB10A75A18F039A149F3C1CB2
- 8E12FF6CFC217D5C9A6D1A7487634E50ABEB672E
- 75A29FEC62A95B4C820454CD82DDF70742A67602
- 0EA42E64F4C8653D865EEA79EB3B37B81206CAC1
- 934BF6E81040089253C209A6B4286A235C240473
- 7C5F9C7541FE56FA11703156086D9F9D9C735800
- BBC8628F92209364C79EC38284DC772B81100BD7
- 0EA42E64F4C8653D865EEA79EB3B37B81206CAC1
- 2203714D747145F9363A6F0DE0D5E7F2FEA792AA
- 222D89261CB18D5EB26AC84041BFA0E1B399A2D5
- B77DD8A56F480F052E262ABF9FB856E8B9F8757D
- 363E4734F757BDEB89868EFE94907774A327695E
- Cl[.]ly
- Flashplayers2018[.]com
- Javadownloadbrasil[.]site
- Musicalad[.]com[.]br
- Nfmicrosoft[.]com
- netframework2018-microsoft[.]com
- hxxp://185.135.9[.]102/suspiro/index.php
- hxxp://198.50.138[.]133/latex/index.php
- hxxp://198.50.138[.]131/hilton/index.php
- hxxp://corretorandremendes.com[.]br/images/contA/ponto.php
- hxxp://f.cl[.]ly/items/1k3W1B0G0a3P0O41220g/open.zip
- hxxp://flashplayers2018[.]com/WEBFLASH_IESS.DOC
- hxxp://x.ss2[.]us/x.cer – SSL certificate
- hxxps://cl.ly/390j3n40002a/download/new10[.]zip
- hxxps://cl[.]ly/0a5f7eb35382/download/flatrom.jpg
- hxxps://cl[.]ly/0b2E2g2c3y2L/download/newpepe.png
- hxxps://cl[.]ly/694965a97454/download/xalita.jpg
- hxxps://cl[.]ly/8a89ef6803d6/download/paulo.jpg
- hxxps://cl[.]ly/f6f5fac35d25/download/testepepeu.jpg
- hxxps://s3.amazonaws.com/f.cl[.]ly/items/2y1A3w3I3K12242b0r36/new10.zip?AWSAccessKeyId=AKIAJEFUZRCWSLB2QA5Q&Expires=1531388058&Signature=VDxQ29GFO%2FqanJvH0SZP3yH87CE%3D&response-content-disposition=attachment
- hxxps://supgmx.egnyte[.]com/dd/PPlFR0ONrE/
- 135.9[.]102
- 50.138[.]133
- 50.138[.]131
RECOMMENDATIONS
Organizations may consider to block these threat indicators as per their security rules. However, to avoid impacts on your organization, the IP/Domain blocking requires diligence. Moreover, the attackers seem to be exploiting an old Microsoft Office Memory Corruption Vulnerability (CVE 2017-11882) in order to execute code. Therefore, all users should ensure that this vulnerability is addressed and patched.
Since the phishing techniques are also evolving at an exponential rate, employee training and awareness programs about social engineering and phishing scams should be considered.
If you think you’re the victim of a cyber-attack, immediately send an e-mail to soc@rewterz.com