Category Archives: Compromise Detection

DeXRAY 2.03 update

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Added ‘handling’ of quarantine.qtn from Symantec products on MAC.

Saying ‘handling’, because at the moment there is no good perl library for encrypted .zip files, BUT…  we really don’t need such library since the decryption is trivial. If the quarantine.qtn is found, you will get a list of files inside the container + information how to extract each file (hint: the password is… a file name 🙂

You can download it here.

The full list of supported or recognized file formats is listed below:

  • AhnLab (V3B)
  • ASquared (EQF)
  • Avast (Magic@0=’-chest- ‘)
  • Avira (QUA)
  • Baidu (QV)
  • BitDefender (BDQ)
  • BullGuard (Q)
  • CMC Antivirus (CMC)
  • Comodo <GUID> (not really; Quarantined files are not encrypted 🙂
  • ESafe (VIR)
  • ESET (NQF)
  • F-Prot (TMP) (Magic@0=’KSS’)
  • Kaspersky (KLQ)
  • Lavasoft AdAware (BDQ) /BitDefender files really/
  • Lumension LEMSS (lqf)
  • MalwareBytes Data files (DATA)
  • MalwareBytes Quarantine files (QUAR)
  • McAfee Quarantine files (BUP) /full support for OLE format/
  • Microsoft Forefront|Defender (Magic@0=0B AD|D3 45) – D3 45 C5 99 header handled
  • Panda <GUID> Zip files
  • Spybot – Search & Destroy 2 ‘recovery’
  • SUPERAntiSpyware (SDB)
  • Symantec ccSubSdk files: {GUID} files and submissions.idx
  • Symantec Quarantine Data files (QBD)
  • Symantec Quarantine files (VBN)
  • Symantec Quarantine Index files (QBI)
  • Symantec Quarantine files on MAC (quarantine.qtn)
  • TrendMicro (Magic@0=A9 AC BD A7 which is a ‘VSBX’ string ^ 0xFF)
  • QuickHeal <hash> files
  • Vipre (<GUID>_ENC2)
  • Zemana <hash> files+quarantine.db
  • Any binary file (using X-RAY scanning)

Beyond good ol’ Run key, Part 66

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I discussed Winsock-based persistence in the past.

There is one more.

It is a bit unusual, as it has to do with automatic proxy configuration, so it’s a bit tricky to reproduce. I have honestly not made an attempt to fully understand the logic winsock uses to determine how to find the proxy, plus it’s pretty late and I only discovered it now so maybe some other time…

For the purpose of this post, one thing that is interesting is this key:

  • HKCR\AutoProxyTypes

The two standard entries underneath are:

  • Application/x-internet-signup
  • Application/x-ns-proxy-autoconfig

It turns out you can add your own e.g.:

Winsock will enumerate the AutoProxyTypes key children nodes while trying to find the proxy and will load DLLs located underneath.

I had luck reproducing it on Windows 7 while tinkering with the Internet Options/Lan Settings (enabling/disabling it), but could not make it work on Windows 10. I may come back to do some more testing later on, but for now this screenshot should suffice: