Help for Ukraine: Free decryptor for HermeticRansom ransomware

Avast - 

On February 24th, the Avast Threat Labs discovered a new ransomware strain accompanying the data wiper HermeticWiper malware,  which our colleagues at ESET found circulating in the Ukraine. Following this naming convention, we opted to name the strain we found piggybacking on the wiper, HermeticRansom. According to analysis done byCrowdstrike’s Intelligence Team, the ransomware contains a weakness in the crypto schema and can be decrypted for free.

If your device has been infected with HermeticRansom and you’d like to decrypt your files, click here to skip to the How to use the Avast decryptor to recover files


The ransomware is written in GO language. When executed, it searches local drives and network shares for potentially valuable files, looking for  files with one of the extensions listed below (the order is taken from the sample):

.docx .doc .dot .odt .pdf .xls .xlsx .rtf .ppt .pptx .one.xps .pub .vsd .txt .jpg .jpeg .bmp .ico .png .gif .sql.xml .pgsql .zip .rar .exe .msi .vdi .ova .avi .dip .epub.iso .sfx .inc .contact .url .mp3 .wmv .wma .wtv .avi .acl.cfg .chm .crt .css .dat .dll .cab .htm .html .encryptedjb

In order to keep the victim’s PC operational, the ransomware avoids encrypting files in Program

Read More: