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Threat Encyclopedia

PE_QUERVAR.C-O

ANALYSIS BY

Jasen Sumalapao


ALIASES:

Virus:Win32/Quervar.gen!B (Microsoft), W32/XDocCrypt.b (NAI), Mal/Agent-AJK (Sophos), Gen:Variant.Zbot.10 (FSecure), TR/Crypt.EPACK.Gen8 (Antivir), Gen:Variant.Zbot.10 (Bitdefender), W32/Zbot.ACM!tr (Fortinet), Trojan-Downloader.Win32.Cbeplay (Ikarus), a variant of Win32/Kryptik.AKWU trojan (NOD32)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:

  • Threat Type:File infector

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.352.05

FIRST VSAPI PATTERN DATE:

27 Aug 2012

VSAPI OPR PATTERN File:

9.353.00

VSAPI OPR PATTERN Date:

28 Aug 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware/grayware files dropped/downloaded by PE_QUERVAR.C-O

Step 3

Scan your computer with your Trend Micro product and note files detected as PE_QUERVAR.C-O

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\Application Data\{Random Folder}

Step 6

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.


  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
    • From: Load = %User Profile%\Application Data\{Random Folder}\{Random File name}.EXE.LNK
      To: Load = ""

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PE_QUERVAR.C-O. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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