Reha ransomware targeting Arabic speaking countries.
The SonicWall Capture Labs threat research team observed reports of a new variant family of Reha ransomware [Reha.RSM] actively spreading in the wild.
The Reha ransomware encrypts the victim’s files with a strong encryption algorithm until the victim pays a fee to get them back.
The ransomware targeting Arabic speaking countries and designed for very specific region.
Infection Cycle:
The ransomware adds the following files to the system:
- Malware.exe
- %App.path%\ [Name]. < .Try2Cry >
- %App.path%\ [Name]. < .txt > recovery instruction
Once the computer is compromised, the ransomware runs the following commands:
The ransomware encrypts all the files with following extensions and appends the [Try2Cry] extension onto each encrypted file’s filename.
*.doc,*.ppt,*.jpg,*.xls,*.pdf,*.docx,*.pptx,*.xlsx
During our analysis, we have noticed the malware using a packer called DNSgaurd to avoid detection by sandboxes in the wild.
This makes our jobs harder to create a Decryptor tool for this ransomware.
However with some dynamic techniques we were able to inject our tool into the ransomware process and extract some valuable data that proves this is a ransomware.
After encrypting all personal documents, the ransomware shows the following picture containing a message reporting that the computer has been encrypted and to contact its developer for unlock instructions.
Translated to English:
We have been monitoring varying hits over the past few days for the signature that blocks this threat:
SonicWall Capture Labs threat research team provides protection against this threat via the following signatures:
- GAV: REHA.RSM (Trojan)
- GAV: Invader.H_176 (Trojan)
- GAV: Pitit.A (Trojan)
This threat is also detected by SonicWall Capture ATP w/RTDMI and the Capture Client endpoint solutions.
