Ramint is a dangerous and evasive malware that steals information and allows the authors to take control of Windows computers.

Below are some hdb signatures for current versions of the Ramnit malware.

Copy hdb signatures to a new Notepad or similar text writer file and save it in the ClamWin database folder as a file named Sigfile.hdb, with a file type of “All Files”. Do not save the file as a text file. The file name should be Sigfile.hdb and nothing else.

For multiple signatures, put each signature on a separate line in a Notepad or similar file. Put mdb and hdb signatures in separate files. You can add multiple signatures to the top of an existing mdb or hdb signature file. Copy the signatures, add one blank line to the top of the file and paste the signatures there—any additional lines needed will be added. Do not add signatures to the bottom of existing hdb and mdb signature files or you will get a ClamWin scanning error. Delete any blank lines between signatures in a file before saving the file.

After you save a signature file (.hdb, .mdb or .yar) in the ClamWin database folder, scan a file with ClamWin to make sure it works. If you get a scan error, accept my apology, and delete the signature file from the database folder or delete only those signatures that you just posted to an existing mdb or hdb file and re-save it after first removing any blank lines in the signature file. For multiple signature files, run a scan after you save each file to help you locate a file that could cause a scan error.

After 4 weeks, the malware will probably be updated, so you can delete mdb and hdb signatures then. The date (USA) and time (24 hr) are the last two items in each mdb and hdb signature. Yara signatures can be kept permanently if they are not for a specific malware—keep specific malware signatures for two or three months.

Thanks to Cisco Talos!

HDB Signatures
97e753870074899f9345b6ffccde9fb2:217520:Win.Trojan.Crypt-082422.1136
785d193f9f1add4649fb0c40c4b82dae:217520:Win.Trojan.Crypt-082422.1139
8debeca84ba352e85c8563e9c4bc6de1:217088:Win.Trojan.Crypt-082422.1141
902be9bf24fac32a739eabbaa95eb23b:222817:Win.Trojan.Crypt-082422.1144

Regards,