Ransom.Win32.OUROBOROS.AB
Trojan-Ransom.Win32.Crypren.afte (Kaspersky); Trojan-Ransom.Ouroboros (IKARUS)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Process Termination
This Ransomware terminates the following services if found on the affected system:
- SQLWriter
- SQLBrowser
- MSSQLSERVER
- MSSQL$CONTOSO1
- MSDTC
- SQLSERVERAGENT
- MSSQLSERVER
- SQLSERVERAGENT
- MySQL
It terminates the following processes if found running in the affected system's memory:
- sqlserver.exe
- msftesql.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlwriter.exe
- mysqld.exe
- mysqld-nt.exe
- mysqld-opt.exe
Other Details
This Ransomware connects to the following URL(s) to get the affected system's IP address:
- www.{BLOCKED}ev.org/ip-provider.php
It does the following:
- It deletes all shadow copies using the following command:
- vssadmin delete shadows /all
- It encrypts files in fixed, removable, and network drives.
- It avoids encrypting files with the following extension:
- .exe
Ransomware Routine
This Ransomware renames encrypted files using the following names:
- {file name}.{file extension}.Email=[BLOCKEDSupport@cock.li]ID=[{15 random characters}].KRONOS
It leaves text files that serve as ransom notes containing the following text:
- {Encrypted Directory}\HowToDecrypt.txt
SOLUTION
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Search and delete these files
- {Encrypted Directory}\HowToDecrypt.txt
Step 4
Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.OUROBOROS.AB. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:
Step 5
Enabling Volume Shadow Service
- Run the command prompt (cmd.exe) as administrator.
- Enable Volume Shadow Service by typing the following command:
net start vss
Step 6
Restore encrypted files from backup.
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