TROJ_CAHYNA.A

January 02, 2013

ALIASES:

Trojan:Win32/Cahyna (Microsoft); Bruja (McAfee); Trojan Horse (Symantec); Trojan.Win32.Cahyna (Kaspersky); BehavesLike.Win32.Malware.sfd (mx-v) (Sunbelt); Trojan.Cahyna.A (FSecure)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

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.

TECHNICAL DETAILS

File Size: 24,576 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 24 Dec 2012

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.

Other System Modifications

This Trojan deletes the following files:

%Desktop%.INI
%Temporary Internet Files%\CONTENT.IE5\2TPM8950\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\4H9MXTT9\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\SMCZPN4M\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\X9QQH2D9\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\DESKTOP.INI
%Temporary Internet Files%\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\ACCESSIBILITY\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\ENTERTAINMENT\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\DESKTOP.INI
%User Startup%\DESKTOP.INI
%Start Menu%\PROGRAMS\DESKTOP.INI
%Start Menu%\DESKTOP.INI
%User Profile%\NTUSER.INI
%User Profile%\PBK\SHAREDACCESS.INI
%Start Menu%\PROGRAMS\ACCESSORIES\COMMUNICATIONS\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\SYSTEM TOOLS\DESKTOP.INI
%Start Menu%\PROGRAMS\ADMINISTRATIVE TOOLS\DESKTOP.INI
%Start Menu%\PROGRAMS\GAMES\DESKTOP.INI
%Common Startup%\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\2BAREZOP\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\IX09SXE9\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\M94XI96V\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\O7EHUPCN\DESKTOP.INI
%System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-1003\DESKTOP.INI
%System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-500\DESKTOP.INI
%Windows%\DOWNLOADED PROGRAM FILES\DESKTOP.INI
%Windows%\FONTS\DESKTOP.INI
%Windows%\OFFLINE WEB PAGES\DESKTOP.INI
%Windows%\PREFETCH\LAYOUT.INI
%System%\CONFIG\SYSTEMPROFILE\APPLICATION DATA\MICROSOFT\INTERNET EXPLORER\QUICK LAUNCH\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\APPLICATION DATA\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\FAVORITES\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\HISTORY\HISTORY.IE5\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\HISTORY\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\0XIJ0DEZ\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\2TPM8950\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\4H9MXTT9\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\8XQVK9U7\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\K96JWPA7\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\OLQ78TEZ\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\SMCZPN4M\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\X9QQH2D9\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\MY DOCUMENTS\MY MUSIC\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\MY DOCUMENTS\MY PICTURES\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\MY DOCUMENTS\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\RECENT\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\SENDTO\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\START MENU\PROGRAMS\ACCESSORIES\ACCESSIBILITY\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\START MENU\PROGRAMS\ACCESSORIES\ENTERTAINMENT\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\START MENU\PROGRAMS\ACCESSORIES\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\START MENU\PROGRAMS\STARTUP\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\START MENU\PROGRAMS\DESKTOP.INI
%System%\CONFIG\SYSTEMPROFILE\START MENU\DESKTOP.INI
%System%\DIRECTX\DINPUT\ACTC094.INI
%System%\DIRECTX\DINPUT\GLMDA.INI
%System%\DIRECTX\DINPUT\GLMDIGGP.INI
%System%\DIRECTX\DINPUT\GR3001.INI
%System%\DIRECTX\DINPUT\GR3001_G.INI
%System%\DIRECTX\DINPUT\GR4001.INI
%System%\DIRECTX\DINPUT\GR4001_G.INI
%System%\DIRECTX\DINPUT\GR4003.INI
%System%\DIRECTX\DINPUT\GR4005.INI
%System%\DIRECTX\DINPUT\HAMMER.INI
%System%\DIRECTX\DINPUT\IA3002.INI
%System%\DIRECTX\DINPUT\LGC202.INI
%System%\DIRECTX\DINPUT\LGC207.INI
%System%\DIRECTX\DINPUT\LGC209.INI
%System%\DIRECTX\DINPUT\LGC20A.INI
%System%\DIRECTX\DINPUT\LGC291.INI
%System%\DIRECTX\DINPUT\MS1B.INI
%System%\DIRECTX\DINPUT\MS26.INI
%System%\DIRECTX\DINPUT\MS27.INI
%System%\DIRECTX\DINPUT\MS28.INI
%System%\DIRECTX\DINPUT\MS34.INI
%System%\DIRECTX\DINPUT\MS3B.INI
%System%\DIRECTX\DINPUT\MS56.INI
%System%\DIRECTX\DINPUT\MS6.INI
%System%\DIRECTX\DINPUT\MS7.INI
%System%\DIRECTX\DINPUT\MS7_G.INI
%System%\DIRECTX\DINPUT\MS8.INI
%System%\DIRECTX\DINPUT\MS8_G.INI
%System%\DIRECTX\DINPUT\MSE.INI
%System%\DIRECTX\DINPUT\MSE_G.INI
%System%\DIRECTX\DINPUT\MSF1F.INI
%System%\DIRECTX\DINPUT\MSPRW.INI
%System%\DIRECTX\DINPUT\RAIDERPD.INI
%System%\OOBE\OOBEINFO.INI
%System%\SPOOL\DRIVERS\W32X86\3\TPPS.INI
%System%\WBEM\PERFORMANCE\WMIAPRPL.INI
%System%\DESKTOP.INI
%System%\ESENTPRF.INI
%System%\MQPERF.INI
%System%\MSDTCPRF.INI
%System%\PERFCI.INI
%System%\PERFFILT.INI
%System%\PERFSTRINGBACKUP.INI
%System%\PERFWCI.INI
%System%\PRODSPEC.INI
%System%\PSCHDPRF.INI
%System%\RASCTRS.INI
%System%\RSVP.INI
%System%\TCPMON.INI
%System%\TSLABELS.INI
%Windows%\TASKS\DESKTOP.INI
%Temp%\HISTORY\HISTORY.IE5\DESKTOP.INI
%Temp%\TEMPORARY INTERNET FILES\CONTENT.IE5\36502Y5M\DESKTOP.INI
%Temp%\TEMPORARY INTERNET FILES\CONTENT.IE5\4NVMMLQI\DESKTOP.INI
%Temp%\TEMPORARY INTERNET FILES\CONTENT.IE5\OROODQAZ\DESKTOP.INI
%Temp%\TEMPORARY INTERNET FILES\CONTENT.IE5\YMT3YC75\DESKTOP.INI
%Temp%\TEMPORARY INTERNET FILES\CONTENT.IE5\DESKTOP.INI
%Windows%\CONTROL.INI
%Windows%\DESKTOP.INI
%Windows%\MSDFMAP.INI
%Windows%\ODBCINST.INI
%Windows%\SMSCFG.INI
%Windows%\VB.INI
%Windows%\VBADDIN.INI
%System Root%\BOOT.INI
%Temporary Internet Files%\CONTENT.IE5\4H9MXTT9\DROPDOWN[1].JPG
%Temporary Internet Files%\CONTENT.IE5\4H9MXTT9\HEADER02[1].JPG
%Temporary Internet Files%\CONTENT.IE5\X9QQH2D9\SUNBELTLABS_LOGO[1].JPG
%User Profile%\SAMPLE PICTURES\BLUE HILLS.JPG
%User Profile%\SAMPLE PICTURES\SUNSET.JPG
%User Profile%\SAMPLE PICTURES\WATER LILIES.JPG
%User Profile%\SAMPLE PICTURES\WINTER.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\CLEAR DAY BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\FIESTA BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\GLACIER BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\LEAVES BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\MAIZE BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\NATURE BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\PIE CHARTS BKGRD.JPG
%Program Files%\COMMON FILES\MICROSOFT SHARED\STATIONERY\SUNFLOWER BKGRD.JPG
%Program Files%\MOVIE MAKER\SHARED\SAMPLE1.JPG
%Program Files%\MOVIE MAKER\SHARED\SAMPLE2.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_ROAD.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_ROAD_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_ROAD_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_ROBUST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_ROBUST_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_ROBUST_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_SECURE.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_SECURE_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\BEST_SECURE_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_DATA.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_DATA_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_DATA_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_MULTIPLE.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_MULTIPLE_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_MULTIPLE_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_NETWORKS.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_NETWORKS_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_NETWORKS_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_WIZARD.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_WIZARD_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONNECTED_WIZARD_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\CONTROL_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\DESKTOP_SCREEN_SHOT.JPG
%Windows%\HELP\TOURS\HTMLTOUR\DESKTOP_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\END_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\FOLDER_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\GRADIENT.JPG
%Windows%\HELP\TOURS\HTMLTOUR\ICON_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG004B.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG014.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG033.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG033A.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG034.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG040.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG046.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG060.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG068.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG072.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG074A.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG089.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG100.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG103.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG109.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG110.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG116.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG121.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG123.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG126.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG136.JPG
%Windows%\HELP\TOURS\HTMLTOUR\IMG149.JPG
%Windows%\HELP\TOURS\HTMLTOUR\INTRO_LOGO.JPG
%Windows%\HELP\TOURS\HTMLTOUR\LOGO.JPG
%Windows%\HELP\TOURS\HTMLTOUR\PEN_ICON.JPG
%Windows%\HELP\TOURS\HTMLTOUR\QUESTION_ICON.JPG
%Windows%\HELP\TOURS\HTMLTOUR\READ_ICON.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_BETTER.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_BETTER_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_BETTER_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_EASIER.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_EASIER_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_EASIER_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_FASTER.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_FASTER_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\SAFE_EASY_FASTER_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\START_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\TASKBAR_UP.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UL_LOGO.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_BUILT.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_BUILT_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_BUILT_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_OPTIMIZED.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_OPTIMIZED_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_OPTIMIZED_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_PLAYING.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_PLAYING_BIG.JPG
%Windows%\HELP\TOURS\HTMLTOUR\UNLOCK_PLAYING_GHOST.JPG
%Windows%\HELP\TOURS\HTMLTOUR\WINDOW_UP.JPG
%Windows%\PCHEALTH\HELPCTR\SYSTEM\DVDUPGRD\STRIPE.JPG
%Windows%\PCHEALTH\HELPCTR\SYSTEM\SYSINFO\GRAPHICS\GREENDOT.JPG
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\4H9MXTT9\DROPDOWN[1].JPG
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\4H9MXTT9\HEADER02[1].JPG
%System%\CONFIG\SYSTEMPROFILE\LOCAL SETTINGS\TEMPORARY INTERNET FILES\CONTENT.IE5\X9QQH2D9\SUNBELTLABS_LOGO[1].JPG
%System%\OOBE\HTML\MOUSE\IMAGES\BULZANO.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\BULZANOM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\HEIDELB.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\HEIDELBM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\PARIS.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\PARISM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\PISA.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\PISAM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\PRAGUE.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\PRAGUEM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\TYROL.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\TYROLM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\VENICE.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\VENICEM.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\VERONA.JPG
%System%\OOBE\HTML\MOUSE\IMAGES\VERONAM.JPG
%System%\OOBE\IMAGES\BACKDOWN.JPG
%System%\OOBE\IMAGES\BACKOFF.JPG
%System%\OOBE\IMAGES\BACKOVER.JPG
%System%\OOBE\IMAGES\BACKUP.JPG
%System%\OOBE\IMAGES\MSLOGO.JPG
%System%\OOBE\IMAGES\NEWBTM1.JPG
%System%\OOBE\IMAGES\NEWBTM8.JPG
%System%\OOBE\IMAGES\NEWMARK1.JPG
%System%\OOBE\IMAGES\NEWMARK8.JPG
%System%\OOBE\IMAGES\NEWTOP1.JPG
%System%\OOBE\IMAGES\NEWTOP8.JPG
%System%\OOBE\IMAGES\NEXTDOWN.JPG
%System%\OOBE\IMAGES\NEXTOFF.JPG
%System%\OOBE\IMAGES\NEXTOVER.JPG
%System%\OOBE\IMAGES\NEXTUP.JPG
%System%\OOBE\IMAGES\OEMCOA.JPG
%System%\OOBE\IMAGES\SKIPDOWN.JPG
%System%\OOBE\IMAGES\SKIPOFF.JPG
%System%\OOBE\IMAGES\SKIPOVER.JPG
%System%\OOBE\IMAGES\SKIPUP.JPG
%System%\OOBE\IMAGES\WPABACK.JPG
%System%\OOBE\IMAGES\WPABTM.JPG
%System%\OOBE\IMAGES\WPAFLAG.JPG
%System%\OOBE\IMAGES\WPAKEY.JPG
%System%\OOBE\IMAGES\WPATOP.JPG
%Windows%\WEB\WALLPAPER\ASCENT.JPG
%Windows%\WEB\WALLPAPER\AUTUMN.JPG
%Windows%\WEB\WALLPAPER\AZUL.JPG
%Windows%\WEB\WALLPAPER\CRYSTAL.JPG
%Windows%\WEB\WALLPAPER\FOLLOW.JPG
%Windows%\WEB\WALLPAPER\FRIEND.JPG
%Windows%\WEB\WALLPAPER\HOME.JPG
%Windows%\WEB\WALLPAPER\MOON FLOWER.JPG
%Windows%\WEB\WALLPAPER\PEACE.JPG
%Windows%\WEB\WALLPAPER\POWER.JPG
%Windows%\WEB\WALLPAPER\PURPLE FLOWER.JPG
%Windows%\WEB\WALLPAPER\RADIANCE.JPG
%Windows%\WEB\WALLPAPER\RED MOON DESERT.JPG
%Windows%\WEB\WALLPAPER\RIPPLE.JPG
%Windows%\WEB\WALLPAPER\STONEHENGE.JPG
%Windows%\WEB\WALLPAPER\TULIPS.JPG
%Windows%\WEB\WALLPAPER\VORTEC SPACE.JPG
%Windows%\WEB\WALLPAPER\WIND.JPG
%Windows%\WEB\WALLPAPER\WINDOWS XP.JPG
%System%.ini

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %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.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Dropping Routine

This Trojan drops the following files:

%System%.new

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine: 9.300

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

Search and delete this file

[ Learn More ]

There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.

%System%.new

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_CAHYNA.A. 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.

Step 4

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

%Desktop%.INI
%Temporary Internet Files%\CONTENT.IE5\2TPM8950\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\4H9MXTT9\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\SMCZPN4M\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\X9QQH2D9\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\DESKTOP.INI
%Temporary Internet Files%\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\ACCESSIBILITY\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\ENTERTAINMENT\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\DESKTOP.INI
%User Startup%\DESKTOP.INI
%Start Menu%\PROGRAMS\DESKTOP.INI
%Start Menu%\DESKTOP.INI
%User Profile%\NTUSER.INI
%User Profile%\PBK\SHAREDACCESS.INI
%Start Menu%\PROGRAMS\ACCESSORIES\COMMUNICATIONS\DESKTOP.INI
%Start Menu%\PROGRAMS\ACCESSORIES\SYSTEM TOOLS\DESKTOP.INI
%Start Menu%\PROGRAMS\ADMINISTRATIVE TOOLS\DESKTOP.INI
%Start Menu%\PROGRAMS\GAMES\DESKTOP.INI
%Common Startup%\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\2BAREZOP\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\IX09SXE9\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\M94XI96V\DESKTOP.INI
%Temporary Internet Files%\CONTENT.IE5\O7EHUPCN\DESKTOP.INI
%System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-1003\DESKTOP.INI
%System Root%\RECYCLER\S-1-5-21-436374069-362288127-839522115-500\DESKTOP.INI
%Windows%\DOWNLOADED PROGRAM FILES\DESKTOP.INI
%Windows%\FONTS\DESKTOP.INI
%Windows%\OFFLINE WEB PAGES\DESKTOP.INI
%Windows%\PREFETCH\LAYOUT.INI
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%System%.ini

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