Wady Ag

Beberapa hari ini, pada chat menggunakan Yahoo Messenger, aku sering dapat pesan :

Biet tin gi chua, vao day coi di http://nhattruongquang.0catch.com
E may, vao day coi co con nho nay ngon lam http://nhattruongquang.0catch.com
Vao day nghe bai nay di ban http://nhattruongquang.0catch.com
Vao day nghe bai nay di ban http://nhattruongquang.0catch.com
Biet tin gi chua, vao day coi di http://nhattruongquang.0catch.com
Trang Web nay coi cung hay, vao coi thu di http://nhattruongquang.0catch.com
Toi di lang thang lan trong bong toi buot gia, ve dau khi da mat em roi? Ve dau khi bao nhieu mo mong gio da vo tan… Ve dau toi biet di ve dau? http://nhattruongquang.0catch.com
Khoc cho nho thuong voi trong long, khoc cho noi sau nhe nhu khong. Bao nhieu yeu thuong nhung ngay qua da tan theo khoi may bay that xa…http://nhattruongquang.0catch.com
Tha nguoi dung noi se yeu minh toi mai thoi thi gio day toi se vui hon.
Gio nguoi lac loi buoc chan ve noi xa xoi, cay dang chi rieng minh toi…http://nhattruongquang.0catch.com
Loi em noi cho tinh chung ta, nhu doan cuoi trong cuon phim buon. Nguoi da den nhu la giac mo roi ra di cho anh bat ngo… http://nhattruongquang.0catch.com
Tra lai em niem vui khi duoc gan ben em, tra lai em loi yeu thuong em dem, tra lai em niem tin thang nam qua ta dap xay. Gio day chi la nhung ky niem buon http://nhattruongquang.0catch.com

Pesan tersebut pemakai YM tidak menyadari kalau mengirim pesan seperti itu. Apakah itu ?

Ini termasuk worm yang mulai muncul akhir 2006 dan mungkin sekarang muncul lagi dengan varian barunya…..

Virus / worm ini dikenal dengan berbagai nama antara lain :

Symantec : W32.Imaut.U
Avira : Worm/Sohanad.bm
Kaspersky: IM-Worm.Win32.Sohanad.bm
F-Secure: IM-Worm.Win32.Sohanad.bm
Sophos: W32/SillyFDC-G atau W32/Sohana-R
Panda: W32/Hakaglan.A.worm
Grisoft: I-Worm/Sohanad.J
Eset: Win32/Hakaglan.AH
Bitdefender: Trojan.AutoIt.TD
McAfee : w32/Yahlover.worm.gen.c

Platforms / OS :

Windows 95
Windows 98
Windows 98 SE
Windows NT
Windows ME
Windows 2000
Windows XP
Windows 2003

Imaut / sohanad / Hakaglan / AutoIt / Yahlover ini, menginfeksi lewat Yahoo! Instant Messenger, Microsoft Windows Live Messenger, dan AOL Instant Messenger. Worm akan download remote files di compromised computer dan disable Windows Task Manager dan Registry tools.

INFECTED

File

Copy di :

%SYSDIR%RVHOST.exe
%WINDIR%RVHOST.exe

Menulis schedule :

%WINDIR%TasksAt1.job File schedule task untuk run malware.

Dan melakukan download di lokasi http://nhatquanglan2.0catch.com/**********
Dan saved ke local hard drive di : %SYSDIR%setting.ini

Registry

Registry keys yg akan ditambahkan pada run the processes setelah reboot :

[HKCUSoftwareMicrosoftWindowsCurrentVersionRun]
• Yahoo Messengger=”%SYSDIR%RVHOST.exe”
[HKLMSOFTWAREMicrosoftWindows NTCurrentVersionWinlogon]
• Shell=”Explorer.exe RVHOST.exe”

Registry keys yang di add :

[HKLMSYSTEMControlSet001ServicesSchedule]
• AtTaskMaxHours=dword:00000000
[HKCUSoftwareMicrosoftWindowsCurrentVersionExplorer
WorkgroupCrawlerShares]
• shared=”%all shared folders%New Folder.exe”

Registry keys yang berubah :

Various Explorer settings :

[HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesExplorer]

Old value :
• NofolderOptions=%user defined settings%

New value :
• NofolderOptions=dword:00000001

Disable Regedit dan Task Manager :

[HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem]

Old value :
• DisableTaskMgr=%user defined settings%
• DisableRegistryTools=%user defined settings%

New value :
• DisableTaskMgr=dword:00000001
• DisableRegistryTools=dword:00000001

Network

Propaganda malware connect pada PC lain dengan cara :

copy sendiri pada network share :
• %all shared folders%New Folder.exe

Penyembuhan

Disable System Restore
Update antivirus
Scan dengan anti virus yang ter update.
Buat file UnHookExec.inf
[Version]
Signature=”$Chicago$”
Provider=Symantec
[DefaultInstall]
AddReg=UnhookRegKey
[UnhookRegKey]
HKLM, SoftwareCLASSESbatfileshellopencommand,,,”””%1?” %*”
HKLM, SoftwareCLASSEScomfileshellopencommand,,,”””%1?” %*”
HKLM, SoftwareCLASSESexefileshellopencommand,,,”””%1?” %*”
HKLM, SoftwareCLASSESpiffileshellopencommand,,,”””%1?” %*”
HKLM, SoftwareCLASSESregfileshellopencommand,,,”regedit.exe “”%1?””
HKLM, SoftwareCLASSESscrfileshellopencommand,,,”””%1?” %*”
HKCU, SoftwareMicrosoftWindowsCurrentVersionPoliciesSystem,DisableRegistryTools,0×00000020,0
Save file tersebut dan right click – install untuk mengembalikan fungsi regedit
Change dan Delete registry Windows yang telah diubah oleh worm.
Nilai registry yang dihapus :
1. HKLMSOFTWAREMicrosoftWindows NTCurrentVersionWinlogon”Shell” = “Explorer.exe ” RVHOST.exe”
2. HKCUSoftwareMicrosoftWindowsCurrentVersionRun”Yahoo Messengger” = “%System%RVHOST.exe”
3. HKCUSoftwareMicrosoftWindowsCurrentVersionExplorerWorkgroupCrawlerShares”shared” = “[SHARED DRIVE]New Folder.exe”
Ubah Registry ke nilai semula :
1. HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem”DisableTaskMgr” = “1?
2. HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem”DisableRegistryTools” = “1?
3. HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesExplorer”NofolderOptions” = “1?
4. HKLMSYSTEMCurrentControlSetServicesSchedule”AtTaskMaxHours” = “0?
5. HKLMSOFTWAREMicrosoftWindowsCurrentVersion”Run” = “BkavFw”
6. HKCUSoftwareMicrosoftWindowsCurrentVersion”Run” = “IEProtection”