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[clamav-users] Determine if ClamAV is looking for a specific piece of ransomware (Linux)
Greetings.

I’m somewhat new to the ClamAV world, so my apologies up front.

I’m attempting to determine if a specific ransomware, Friedex.d, a variant of Iencrypt, is being scanned for with the current definitions.
I came across an article that basically said to dump the database and search for the name. So I did,

# mkdir signatures
# cd signatures
# sigtool –unpack=/var/lib/clamav/main.cvd
# grep -i “ransom.win32.friedex.d” *
# grep -i “efc3418eb170c6bf503140cff504eec8” * ## MD5 hash of the Ransomware
# grep -i “be30850f25e01c84f218022199791911ce64b580” * ## SHA1 hash

No results from any of those greps. My immediate thought is that it’s not in the definition files. But then I can’t find anywhere on the website to submit data for a known piece of ransomware that ClamAV does not appear to have defined. Here’s the data that I have:

Threat Type
Targeted Ransomware
Virus Name
Ransom.Win32.FRIEDEX.D Variant of Iencrypt
Hash
MD5: efc3418eb170c6bf503140cff504eec8 SHA1: be30850f25e01c84f218022199791911ce64b580
IP Point of Origin
Empire C2: 185.92.74.215 Brute Force: 185.92.74.133
Other tools
Mimikatz PowerShell Empire PS-EXEC
Virus Details
SIZE: 135,168 FILE TYPE: EXE MEMORY RESIDENT: Yes ENCRYPTED: Yes

Perhaps I just am not looking correctly, or I’m not looking in the right place? Or maybe I’m just going about this hunt in the wrong way!

Thank you in advance!

Scott
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Re: [clamav-users] Determine if ClamAV is looking for a specific piece of ransomware (Linux) [ In reply to ]
Hi there,

On Mon, 4 Nov 2019, Scott Shannon via clamav-users wrote:

> I?m attempting to determine if a specific ransomware, Friedex.d, a
> variant of Iencrypt, is being scanned for ...

It isn't clear to me if you have a ClamAV installation or not. If you
do, you can presumably get a copy of the malware and scan for it. If
you don't, and you don't want to, then you could submit a sample to a
Website like Jotti's:

https://virusscan.jotti.org/

which will scan it using a couple of dozen scanners, ClamAV included.

> ... with the current definitions.

Please define "the current definitions". :) There are many third-party
signatures. Depending on requirements at a particular site, they may or
may not be in use at that site. For example, I'm mainly interested in
filtering mail for spam. So I use a lot of third party spam signatures
but I make little effort to add to ClamAV's 'official' virus database.

> I came across an article that basically said to dump the database
> and search for the name...

But which name? There's no universal naming convention for malware.
However, in this case, maybe you're in luck:

$ grep -ia friedex /var/lib/clamav/databases/*
daily.cld:Win.Ransomware.Friedex-6961100-0;Engine:81-255,Target:1;[snip]

Of course there could be a whole family of the little varmints.

> ... I can?t find anywhere on the website to submit data for a known
> piece of ransomware ...

My first search:

https://www.bing.com/search?q=clamav+submit+virus

The first hit:

https://www.clamav.net/reports/malware

But it would be as well to check first that it isn't already covered.

--

73,
Ged.

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