Many Malware Samples Found on Pastebin

Published: 2017-02-05
Last Updated: 2017-02-05 10:21:09 UTC
by Xavier Mertens (Version: 1)
1 comment(s)

pastebin.com is a wonderful website. I'm scrapping all posted pasties (not only from pastebin.com) and pass them to a bunch of regular expressions. As I said in a previous diary[1], it is a good way to perform open source intelligence. Amongst many configuration files, pieces of code with hardcoded credentials, dumps of databases or passwords, sometimes it pays and you find more interesting data.

For a few days, I'm finding many pasties that contain only Base64 data. The decoded data are malicious PE files. Some files were posted multiple times, others were unique. Some examples from my list:

  • hxxp://pastebin.com/cW0zR4St
  • hxxp://pastebin.com/QTEd5Eqe
  • hxxp://pastebin.com/Zfhtnk9X
  • hxxp://pastebin.com/nVRhzRxJ
  • hxxp://pastebin.com/8U5beggH

Most of the malicious files are known on VT (submitted a few hours ago), others are unknown. I also detected some obfuscated pasties:The Base64 code is reversed:

  • hxxp://pastebin.com/C7YYaUZB

Another technique is the hex-encode the Base64 data:

  • hxxp://pastebin.com/GeNX7DYP
  • hxxp://pastebin.com/15en56ZE

This technique has already been seen in the past[2]. Powershell or Javascript scripts download malicious content from pastebin.com. But, until now, I was not able to find any reference to the pasties above. Please share with us if you have more information!

In the meantime, it could be a good idea to keep an eye on your logs and search for HTTP requests to these URLs (or globally to pastebin.com if this service is not used in your environment).

[1] https://isc.sans.edu/forums/diary/Hunting+for+Juicy+Information/20555
[2] https://blog.malwarebytes.com/cybercrime/2016/10/get-your-rat-on-pastebin/

Xavier Mertens (@xme)
ISC Handler - Freelance Security Consultant
PGP Key

1 comment(s)

Comments

cwqwqwq
eweew<a href="https://www.seocheckin.com/edu-sites-list/">mashood</a>
WQwqwqwq[url=https://www.seocheckin.com/edu-sites-list/]mashood[/url]
dwqqqwqwq mashood
[https://isc.sans.edu/diary.html](https://isc.sans.edu/diary.html)
[https://isc.sans.edu/diary.html | https://isc.sans.edu/diary.html]
What's this all about ..?
password reveal .
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure:

<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.

<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
https://thehomestore.com.pk/

Diary Archives