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Applications

  • Fast Fourier transform spectrum analyzer
  • Stereo, mid-side, surround spectrum analyzer
  • Stereo correlation meter
  • EBU R128, K-system meter
  • RMS, true peak level and clipping detector

SPAN is a free real-time “fast Fourier transform” audio spectrum analyzer AAX, AudioUnit and VST plugin for professional sound and music production applications.

SPAN provides you with a very flexible “mode” system which you can use to setup your spectrum analyzer preferences. You may specify Fourier block size in samples, FFT window overlap percentage, spectrum's visual slope. Beside that, you can choose to display secondary spectrum of a desired type (e.g. real-time maximum, all-time maximum). Spectrum can be smoothed out visually for an easier examination.

SPAN supports multi-channel analysis, and can be set to display spectrums from two different channels or channel groups at the same time. Spectrum's color can be chosen to taste.

SPAN also features output level metering with adjustable ballistics and integration time, EBU R128, K-system metering (including calibration K-system metering). SPAN displays level metering statistics, headroom estimation and true peak clipping detection. Correlation metering is available as well.

Hey !
today I'll present some research around a spambot named 'Onliner'. This spambot is actually used for spreading Gozi.
I've already talk about Onliner in another blogpost but because the spambot quickly evolve, and the botmaster seems to tries to avoid pwning attempst, I'll try to explain everything here :].

Original sample

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The first sample that I've grab come from email, dropped by JSDropper.
A quick dynamic analysis allow us to understand that it's a spambot (a lot of SMTP connections from the malicious process).
Before reversing it, let's look a the CNC communication.
Malware communicates over HTTP. An interesting thing is that the process doesn't contacts directly the CNC, it try to contact some proxy web page (PHP script uploaded on compromised websites).

Proxy - Good idea - Bad realization

Using proxy websites is a good idea only if you don't use poor pwned CMS. With poor pwned CMS it take around 3 minutes to anybody to retrieves your real CNC. Example:
I can make some supposition:
  • It's pretty sure that the bot master uses a script for updating all the proxies scripts
  • All the compromised websites are old: most probable infection vectors are FTP Bruteforce or CMS exploits
  • They have leave a php backdoor somewhere on the compromised website
I have try to found the PHP backdoor for using it to read the PHP proxy code. After some guessing I have saw that the PHP backdoor is a WSO webshell, uploaded always in the same locations:
  • /cgi-bin/terms.php
  • /cgi-bin/useterms.php
  • /css/terms.php
  • /css/useterms.php
the WSO webshell is protected by a poor password -> I can read the PHP proxy code :). The commented version below:
The real CNC is http://194.247.13.8/img/. I'll come back later on the $GET_['99'] / $_POST['99'] parameters, those parameters are really interesting in the pwning process :D.

Panel - Good idea - Bad realization


Funny, the authentication is not like in others panels.
I don't want to directly use brute force here because like in almost all panels it must have a vulnerability somewhere.
Come back to the malware communication. As you can see here, the malware download some dll (ssl and 7zip) from the CNC.
I'm not a good pentester but when you saw a full dll name ssleay32.dll in a GET parameter, it's smell something bad o/.
Thanks to that LFI we have access to all the panel (click on image bellow for the full album)
After looking around, I've found a reference to another IP: 194.247.13.178. This server host another onliner web panel: hxxp://194.247.13.178/naomi/login.php (click on image bellow for the full album)
By looking at the IP addresses (194.247.13.18 and 194.247.13.178) it seems that those guys really like 'DELTA-X' hoster (Ukraine).
You know, for science, I've try to scan 194.247.13.0-255 with Nmap on port 80 + some directory guessing with Patator.
And you know what? It works haha!
I've found another panel at hxxp://194.247.13.196/asus/login.php . Spam Bot For Mac Download

Panel V2 - Good idea - Bad realization

After releasing the first blogpost about onliner, the botmaster change some stuff. They start to use IP White listing for accessing the panel, they update some code, they don't patch the LFI, they add some others vulns x].
Now, due to IP White listing, when you try to access the web panel, you are kicked by the PHP script:
The LFI is still here so we can look at the code. We can see 4 IPs white listed (Please don't spoil yourself, ignore the 2 first foreach haha I'll discuss that below):
It looks bad. I can read the PHP code but I can't access the admin panel. It's time to understand the authentication process. Take a seat, it's wonderfull. This is a big picture of the process:
admin.php:
I cannot explain yet what the hell is that
if ($_GET['pass']'Lm7%Dv)ko4q') {
include('login.php');
}

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Anyway, the big picture show us that the situation looks bad, the IP White listing is done early. But the function for IP White listing is in fact... a backdoor o/:
Remember the $_GET['99'] in the PHP proxy script ? Look at the script. For bypassing IP White listing when an infected bot try to contacts the CNC, they use this parameters $_GET['99'] and $_POST['99']. Spam Bot For Mac Download
I just need the code (in config.php) + set the POST and GET variables and I can access to the CNC from any IPs.
curl --data 'code=70183619&99=backdoor' 'http://194.247.13.178/naomi/admin.php?99=backdoor&mailer=true' > onliner.html

Bonus

To finish, I just want to show you without comment 2 security features used in the Onliner panel.
SpamAnti-SQLi:
Spam Bot For Mac DownloadAnti-... I don't know what:

Malware binary

The malware himself is in fact a dropper. When you run it, it copy itself in C:windows and re-run as services.
The dropper try to drop 2 dlls:
  • http://cnc.com/MailerSMTP/dll.dll : the Spam module
  • http://cnc.com/CheckerSMTP/dll.dll : the SMTP credentials checker module
Those 2 dll are xored with the key
[0x37, 0x32, 0x44, 0x45, 0x34, 0x45, 0x35, 0x33, 0x36, 0x46, 0x35, 0x42, 0x32, 0x37, 0x39, 0x36, 0x31, 0x43, 0x43, 0x44, 0x41, 0x37, 0x30, 0x43, 0x32, 0x30, 0x39, 0x37, 0x38, 0x32, 0x46, 0x44, 0x44, 0x35, 0x31, 0x34, 0x43, 0x34, 0x36, 0x37, 0x44, 0x37, 0x39, 0x44, 0x30, 0x39, 0x39, 0x33, 0x38, 0x30, 0x33, 0x35, 0x31, 0x39, 0x43, 0x33, 0x32, 0x41, 0x46, 0x37, 0x33, 0x30, 0x34, 0x30, 0x00]
A little schema of the malware communication initialization: (the communication is encoded with base64 with $_GET parameters)
All the modules needed are copied in c:windows too.
After installation, the malware wait for command from the CNC.Here, an example with the CheckerSMTP Module:
  • The CNC send the 'control account', this account (mail+password+smtpserver) is used to be sure that the spamming process works. Valid SMTP credentials can be sends to this control account to
  • The CNC send a file a list of SMTP server + a list of compromised account in 2 zip files. mask.zip and 3746000.zip
  • The CNC wait until the bot finish his job and send another list of SMTP+Credentials

The sample is pretty good detected by AV industry (maybe due to the lot of debug strings present in the binary).

Conclusion

As reminded, this spam bot is used to spread Gozi in Italy and Canada.
Onliner has around 1000 infected bots, they don't spread to much sample of the spambot.
I look forward the next update of the panel.

Annexe

Onliner known IPs:
  • 194.247.13.8
  • 194.247.13.178
  • 194.247.13.196
  • 91.210.165.163

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Spambot sample:

Auto Spam Bot

Module samples: