PE_QUERVAR.E-O
Trojan.Win32.Rimecud.d (v) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: File infector
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This malware downloads a ransomware that pretends to enforce copyright laws and locks the affected system, preventing users from using it.
To get a one-glance comprehensive view of the behavior of this File infector, refer to the Threat Diagram shown below.
![](https://documents.trendmicro.com/images/pe_quervar_e_o2.gif)
This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It injects its dropped file/component to specific processes.
It creates an infection marker in infected files.
TECHNICAL DETAILS
Arrival Details
This file infector arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This file infector drops the following copies of itself into the affected system:
- %User Profile%\Application Data\{random folder name}\{random file name}.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It drops the following component file(s):
- %User Profile%\Application Data\{random folder name}\{random file name}.exe.lnk
- %User Profile%\Application Data\{random folder name}\{random file name}.exe.ini
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It creates the following folders:
- %User Profile%\Application Data\{random folder name}
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It injects its dropped file/component to the following processes:
- csrss.exe
It terminates the execution of the copy it initially executed and executes the copy it drops instead.
It terminates itself if it finds the following processes in the affected system's memory:
- taskmgr.exe
Autostart Technique
This file infector modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
load = "%User Profile%\Application Data\{random folder name}\{random filename}.exe.lnk"
(Note: The default value data of the said registry entry is "".)
File Infection
This file infector infects the following file types:
- exe
- doc
- docx
- xls
- xlsx
It creates an infection marker in infected files.
Download Routine
This file infector connects to the following website(s) to download and execute a malicious file:
- http://{BLOCKED}l.ru/33797470/2a06754.50664748/3052832ace10d474336096b36fbd49f05f190.exe?{random characters} - detected by Trend Micro as TROJ_SIREFEF.SZP
- http://{BLOCKED}0.com/c/osnovnoj2.exe?{random number} - detected by Trend Micro as TROJ_RANSOM.CMY
Other Details
This file infector connects to the following possibly malicious URL:
- http://{BLOCKED}ewidea1.ru/1.php?{random characters}&pin={random characters}&crc={random characters}
- http://www. {BLOCKED}oservisi.com/test/php/way.php?{random characters}&pin=58252D00982BC1DA&crc={random characters}
NOTES:
This file infector rename the extension of the infected file as follows:
- .doc to .cod.scr
- .docx to .xcod.scr
- .xls to .slx.scr
- .xlsx to .xslx.scr
It then deletes the original copy of the infected files.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Remove malware/grayware files dropped/downloaded by PE_QUERVAR.E-O
Step 3
Scan your computer with your Trend Micro product and note files detected as PE_QUERVAR.E-O
Step 4
Restart in Safe Mode
Step 5
Search and delete these folders
- %User Profile%\Application Data\{random folder name}
Step 6
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out 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 name}\{random filename}.exe.lnk"
To: load = ""
- From: load = "%User Profile%\Application Data\{random folder name}\{random filename}.exe.lnk"
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as PE_QUERVAR.E-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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