WORM_KILLAV.WYA
Trojan-Dropper.Win32.Injector.gwqe(Kaspersky), VirTool:Win32/CeeInject.FE(Microsoft), a variant of Win32/Injector.ABAH trojan(Eset)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Propagates via removable drives
This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
271,872 bytes
EXE
No
19 Nov 2014
Connects to URLs/IPs, Terminates processes
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It 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 worm drops the following files:
- %Application Data%\Microsoft\_ZZZZCertifiededd\winenit.dll - also detected as WORM_KILLAV.WYA
- %Application Data%\Microsoft\_ZZZZCertifiededd\_E39winitinet32ss.dll - also detected as WORM_KILLAV.WYA
- {Drive}:\My Passwords.txt
- {Drive}:\Message.txt
- {Drive}:\Family Photos.lnk
- {Drive}:\Message.txt.lnk
- {Drive}:\My Girlfriend Images.lnk
- {Drive}:\My Passwords.txt.lnk
- {Drive}:\Sexy Photos.lnk
- {Drive}:\{folder or file name}.lnk - if folder / file exists in removable drives
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following non-malicious files:
- %Application Data%\Microsoft\Libraries\bystvu.dll - copy of urlmon.dll
- %Application Data%\Microsoft\Libraries\dpupula.dll - copy of wininet.dll
- %Application Data%\Microsoft\Libraries\dz5_65.dll - copy of ws2_32.dll
- %Application Data%\Microsoft\Libraries\hkchwp65.dll - copy of advapi32.dll
- %Application Data%\Microsoft\Libraries\pwoswhwp.dll - copy of iphlpapi.dll
- %Application Data%\Microsoft\Libraries\rlyuls65.dll - copy of kernel32.dll
- %Application Data%\Microsoft\Libraries\uakss.dll - copy of ntdll.dll
- %Application Data%\Microsoft\Libraries\Ulahwp65.dll - copy of netapi32.dll
- %Application Data%\Microsoft\Libraries\zolss65.dll - copy of shell32.dll
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Its DLL component is injected to the following process(es):
- all running processes
It creates the following folders:
- %Application Data%\Microsoft\Libraries
- %Application Data%\Microsoft\_ZZZZCertifiededd
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Run = "%Application Data%\Microsoft\_ZZZZCertifiededd\_E39msnmsgrskypess.exe"
Other System Modifications
This worm modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden
UncheckedValue = "0"
(Note: The default value data of the said registry entry is 1.)
Propagation
This worm creates the following folders in all removable drives:
- {Drive}:\Sexy Photos
- {Drive}:\My Girlfriend Images
- {Drive}:\Family Photos
It drops the following copy(ies) of itself in all removable drives:
- {Drive}:\RemovableDrive.exe
Other Details
This worm connects to the following URL(s) to get the affected system's IP address:
- api.wipmania.com
It connects to the following website to send and receive information:
- omar.{BLOCKED}l.net
NOTES:
This worm creates .LNK (shortcut) files using folder names found in removable drives. It then hides the original folder tricking users to click .LNK files. This .LNK files point out to a dropped copy of itself in the removable drive.
It may also terminate active windows with the following strings:
- AntiVir Desktop
- Avast
- AVAST software
- Avira
- Kasper
- Microsoft Security Client
- msseces.exe
SOLUTION
9.700
11.290.03
21 Nov 2014
11.291.00
21 Nov 2014
Step 1
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 2
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
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 NT\CurrentVersion\Windows
- Run = "%Application Data%\Microsoft\_ZZZZCertifiededd\_E39msnmsgrskypess.exe"
- Run = "%Application Data%\Microsoft\_ZZZZCertifiededd\_E39msnmsgrskypess.exe"
Step 5
Restore this modified 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\Advanced
- From: ShowSuperHidden = "0"
To: ShowSuperHidden = 1
- From: ShowSuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\SuperHidden
- From: UncheckedValue = "0"
To: UncheckedValue = 1
- From: UncheckedValue = "0"
Step 6
Search and delete these folders
- %Application Data%\Microsoft\Libraries
- %Application Data%\Microsoft\_ZZZZCertifiededd
- {Drive}:\Sexy Photos
- {Drive}:\My Girlfriend Images
- {Drive}:\Family Photos
Step 7
Search and delete this file
- {Drive}:\My Passwords.txt
- {Drive}:\Message.txt
- {Drive}:\Family Photos.lnk
- {Drive}:\Message.txt.lnk
- {Drive}:\My Girlfriend Images.lnk
- {Drive}:\My Passwords.txt.lnk
- {Drive}:\Sexy Photos.lnk
- {Drive}:\{folder or file name}.lnk - if folder / file exists in removable drives
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_KILLAV.WYA. 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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