BKDR_NEUREVT.YO
Trojan:Win32/Neurevt.A (Microsoft), Trojan.Win32.Neurevt (Ikarus), Win32/Neurevt.A trojan (NOD32) Backdoor.Win32.ReggieWongBots (Alpha Gen), Trojan.Scar.AD (Bitdefender)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes commands from a remote malicious user, effectively compromising the affected system.
It modifies the Internet Explorer Zone Settings.
It retrieves specific information from the affected system.
TECHNICAL DETAILS
245,248 bytes
EXE
Yes
09 Aug 2013
Compromises system security, Terminates processes, Steals information
Arrival Details
This Trojan 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 Trojan injects codes into the following process(es):
- wuauclt.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
jewsdidit = "{malware path}\{malware filename}.exe"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer
TaskbarNoNotification = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Win7zip
Uuid = "{random values}"
Backdoor Routine
This Trojan connects to any of the following IRC server(s):
- http://imgay.{BLOCKED}s.cat
- http://imgay.{BLOCKED}s.es
- http://imgay.{BLOCKED}at.net
It executes the following commands from a remote malicious user:
- Download files
- Upload files
- Copy itself in removable drives
- Start or stop programs
- Delete files
Web Browser Home Page and Search Page Modification
This Trojan modifies the Internet Explorer Zone Settings.
Information Theft
This Trojan retrieves the following information from the affected system:
- Operating system version
- CPU information
- Information on installed FTPs
- Installed applications
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- update.microsoft.com
- microsoft.com
- windowsupdate.microsoft.com
- google.com
NOTES:
This malware queries the following registry key to get Microsoft Net Framework Version:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Net Framework setup\NDP
It queries the following registry key to get the processor information:
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor
It disables the following antivirus-related applications by adding the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ Windows NT\CurrentVersion\Image File Execution Options\{application} Debugger = "{application}_.exe"
Wherein the {application} can be any of the following:
- a2guard.exe
- a2service.exe
- a2start.exe
- adaware.exe
- ALUpdate.exe
- arcaclean.exe
- avastsvc.exe
- avastui.exe
- avcenter.exe
- AVENGINE.exe
- avgcfgex.exe
- avgdiagex.exe
- avgidsagent.exe
- avgmfapx.exe
- avgnt.exe
- avguard.exe
- avgui.exe
- avgupd.exe
- avgwdsvc.exe
- AVK.exe
- AVKTray.exe
- avshadow.exe
- BgScan.exe
- BullGuard.exe
- BullGuardBhvScanner.exe
- BullGuardScanner.exe
- BullGuardUpdate.exe
- BullGuardUpdate2.exe
- ccsvchst.exe
- ccupdate.exe
- CLPSLA.exe
- coreFrameworkHost.exe
- coreServiceShell.exe
- egui.exe
- ekrn.exe
- epavjobs.exe
- ForceField.exe
- FProtTray.exe
- FPWin.exe
- fshoster32.exe
- GDFirewallTray.exe
- GDSC.exe
- K7TSUpdT.exe
- mbam.exe
- mbamgui.exe
- mcagent.exe
- McPvTray.exe
- mcshell.exe
- mcshield.exe
- McSvHost.exe
- McUICnt.exe
- mcupdate.exe
- mcupdmgr.exe
- MSASCui.exe
- MsMpEng.exe
- msseces.exe
- niu.exe
- op_mon.exe
- pctsAuxs.exe
- pctsGui.exe
- pctsSvc.exe
- PSANHost.exe
- PSUAService.exe
- PSUNMain.exe
- RavMonD.exe
- rcfp.exe
- rsmain.exe
- RsMgrSvc.exe
- RsTray.exe
- SBAMTray.exe
- sbamui.exe
- sguardxup.exe
- starter_avp.exe
- symerr.exe
- uiSeAgnt.exe
- uiWatchDog.exe
- Update.exe
- update_tmp.exe
- updater.exe
- Upgrader.exe
- usrreq.exe
- uWinMgr.exe
- WRSA.exe
- zatray.exe
SOLUTION
9.300
10.206.04
09 Aug 2013
10.207.00
10 Aug 2013
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
Scan your computer with your Trend Micro product and note files detected as BKDR_NEUREVT.YO
Step 3
Restart in Safe Mode
Step 4
Delete this registry value
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\CurrentVersion\Explorer
- TaskbarNoNotification = "1"
- TaskbarNoNotification = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"
- ShowSuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Win7zip
- Uuid = "{random values}"
- Uuid = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- jewsdidit = "{malware path}\{malware filename}.exe"
- jewsdidit = "{malware path}\{malware filename}.exe"
Step 5
Reset Internet security settings
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_NEUREVT.YO. 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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