Rewterz Threat Alert – GandCrab Ransomware – Active IOCs

Severity

High

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 discovery. GandCrab ransomware encrypts victim’s files and demands ransom money in exchange for decryption keys. GandCrab targets organisations and individuals that use Microsoft Windows-powered PCs. This ransomware has attacked a huge number of systems in India, Chile, Peru, the United States, and the Philippines. This ransomware has been linked to some of the most notorious ransomware outbreaks, resulting in enormous financial losses for victims. To effectively victimize the target, its operators frequently try to imitate reputable services. In January 2020, for example, GandCrab was transmitted in a word document labeled “Flu pandemic warning.doc” that purportedly came from the Centers for Disease Control. The virus is assigned various name by different antivirus software including Trojan.Ransom.GandCrab, Win32/Filecoder.GandCrab, Ransom: Win32/GandCrab, and others

Impact

• Files Encryption

Indicators of Compromise

MD5

85fab8174bc91d7c0538fb67336e852c
6d7044f7935d7f26ab90e1e60e6d42eb
ab051235b854ce3d7729a275b5833a5f

SHA-256

125f75320c80d5b4d73c000058f26e92207d28a3d7d88551041f7a62f2a59e3c
7a914a3d4eca34b0f4798548bcdb3a5b01634c64668b9c77e7acc6be4585416c
c30f6a1e5c9501b6e2dfae5c6c4e521438c3c7da795346ae9e05a75bf010684d

SHA-1

0c7fcf278d72608caf7443e8830f2365c67f9916
83c102769b3e6387d20b3d4b98907bc638e3ec86
7f8e733a2711089f26546bf0202cf3895c658373

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Along with network and system hardening, code hardening should be implemented within the organization so that their websites and software are secure. Use testing tools to detect any vulnerabilities in the deployed codes.
• Enable antivirus and anti-malware software and update signature definitions in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets