Rewterz Threat Alert – CrySIS aka Dharma Ransomware – Active IOCs

Severity

High

Analysis Summary

CrySIS, also known as Dharma, is a group of ransomware that has been developing starting around 2016. We have seen that this ransomware has become progressively dynamic of late, expanding by an edge of 148% from February until April 2019. The increase in discoveries might be because of CrySIS’ powerful utilization of different assault vectors. Italian Windows users are being targeted by a spam campaign that is spreading the Dharma ransomware as the end payload. Researchers indicate the spam emails attempt to disguise themselves as invoice emails. In reality, the spam is being used to infect users with the Ursnif keylogger or the Dharma ransomware. The emails claim that the included URL is a link to invoice documents that need the reader’s approval. The URL references a OneDrive page where a file named “New documento 2.zip” is automatically downloaded as soon as the page is displayed. The zip file contains a Visual Basic script and an image file. Should the user execute the Visual Basic script, infection begins.

Impact

• Data Encryption

Indicators of Compromise

MD5

• b2f083ee365141030c49ddffc325f6be

SHA-256

• 231bba5652f6fbdbab3016362fb7925fc4e4489fff5e6a4a98c37fba5bd0cfe9

SHA-1

• f1091be7e566d068403a87b0e7ed4b959c952c8e

Remediation

• Block all threat indicators at your respective controls. 
• Always be suspicious about emails sent by unknown senders. 
• Never click on the links/attachments sent by unknown senders.