WORM_SDBOT.LM

Malware type: Worm

Aliases: Backdoor.Win32.SdBot.aad (Kaspersky), W32/Sdbot.worm.gen.bi (McAfee), W32.Spybot.Worm (Symantec), Worm/SdBot.38912.38 (Avira), W32/Tilebot-GG (Sophos),

In the wild: No

Destructive: Yes

Language: English

Platform: Windows 95, 98, ME, 2000, NT, and XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

High

Distribution potential:

High

Description: 

This memory-resident malware drops a copy of itself in the Windows System folder under the name MDIGITS.EXE.

It creates registry entries to ensure automatic execution at every Windows startup.

This malware gains full access to the system by using a long list of user names and passwords. It drops copies of itself on vulnerable systems in the network.

It terminates various processes on the system. Most of these processes are security and antivirus-related files. Some are even used by other malware.

This worm opens a random port and connects to the Internet Relay Chat (IRC) server LONDON.UK.EU.UNDERNET.ORG. It joins the channel #TIKA where it listens for commands from a remote malicious user.

Some of the commands it can perform on the system are:

  • Attempt email spoofing
  • Capture screen of the target machine
  • Create a clone of the Bot
  • Disable Network shares
  • Download, read, open, and execute a file
  • Flood a specific target host
  • Gather CD keys of various software on the system
  • Get system information
  • Join/Part a channel
  • Port scanning
  • Update a copy of itself

For additional information about this threat, see:

Description created: Apr. 12, 2004 9:11:12 PM GMT -0800
Description updated: Apr. 12, 2004 9:11:36 PM GMT -0800


TECHNICAL DETAILS


Size of malware: 115,680 Bytes (compressed)
585,728 Bytes (uncompressed)

Initial samples received on: Apr 12, 2004

Variant ofWORM_SDBOT

Payload 1: Terminates Processes

Trigger condition 1: upon execution

Payload 2: Compromises system security

Trigger condition 1: upon execution

Details:

Installation and Autostart Technique

This memory-resident worm drops a copy of itself as MDIGITS.EXE in the Windows system folder.

(Note: The Windows system folder is usually C:\Windows\System on Windows 95, 98 and ME, C:\WINNT\System32 on Windows 2000 and NT, and C:\Windows\System32 on Windows XP.)

To ensure automatic execution at every system startup, it creates the following registry entries:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
Microsoft Digital Cryptors = "mdigits.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsCurrentVersion\RunServices
Microsoft Digital Cryptors = "mdigits.exe"

Network Propagation

This malware gains full access to the system by using a list of user names and passwords.

User names:

  • academia
  • academic
  • administrator
  • aerobics
  • airplane
  • albany
  • albatross
  • algebra
  • alias
  • aliases
  • alphabet
  • amorphous
  • analog
  • anchor
  • andromache
  • angerine
  • animals
  • annette
  • answer
  • anthropogenic
  • anvils
  • anything
  • ariadne
  • arrow
  • asshole
  • atmosphere
  • aztecs
  • bacchus
  • backup
  • badass
  • banana
  • bananas
  • bandit
  • banks
  • barber
  • baritone
  • bartman
  • basic
  • bassoon
  • batch
  • batman
  • beach
  • beater
  • beauty
  • beaver
  • becky
  • beethoven
  • beloved
  • beowulf
  • berkeley
  • berlin
  • berliner
  • beryl
  • betsie
  • betty
  • bicameral
  • bitch
  • broadway
  • bumbling
  • burgess
  • campanile
  • candi
  • cantor
  • cardinal
  • caren
  • cascades
  • guest
  • jacob
  • matthew
  • michael
  • yohari
  • yomira
  • yubeli
  • yudelky
  • yudiria
  • yulibeth
  • yulissa
  • yulitza
  • yuneisy
  • yuridia
  • yuriria
  • yvonna
  • yvonne
  • yzabel
  • zabrina
  • zahtavia
  • zaidimar
  • zainab
  • zakaria
  • zakiya
  • zatowana
  • zelekah
  • zenaidalee
  • zenda
  • zennie
  • zepporah
  • ziahya
  • zirisoley
  • zjudeyah
  • zofia
  • zuleima
  • zulema
  • zulmarie
  • zurysarai
  • zusette

Passwords:

  • !@#$%
  • 00000
  • 000000
  • 0000000
  • 00000000
  • 000000000
  • 0000000000
  • 111111
  • 11111111
  • 121212
  • 123123
  • 12345
  • 123456
  • 1234567
  • 12345678
  • 123456789
  • 12346
  • 123467
  • 1234678
  • 12346789
  • 123467890
  • 1234qwer
  • 123abc
  • 123asd
  • 123qwe
  • 54321
  • 55555
  • 654321
  • 666666
  • 7777777
  • 88888888
  • 999999999
  • abc123
  • access
  • admin
  • asdfgh
  • changeme
  • database
  • databasepass
  • databasepassword
  • db1234
  • dbpass
  • dbpassword
  • domainpass
  • domainpassword
  • enable
  • godblessyou
  • hackme
  • hackmybox
  • hackmypassword
  • hackmypwd
  • hackthisbox
  • ihavenopass
  • oracle
  • pass1234
  • passwd
  • password
  • password1
  • sqlpass
  • super
  • sybase
  • temp123

On vulnerable systems, it drops a copy of itself in the following network shares:

  • \ADMIN$
  • \ADMIN$\System32
  • \C$
  • \C$\Documents and Settings\All Users\Documents
  • \C$\WINDOWS\System32
  • \C$\WINNT\System32
  • \D$\WINDOWS\System32
  • \D$\WINNT\System32
  • \E$\WINDOWS\System32
  • \E$\WINNT\System32
  • \IPC$
  • \PRINT$

Process Termination

The malware terminates various processes on the system. Most of these processes are security and antivirus-related files. Some are even used by other malware.

Listed here are the some of the processes it terminates:

  • _AVP32.EXE
  • _AVPCC.EXE
  • _AVPM.EXE
  • ACKWIN32.EXE
  • ADVXDWIN.EXE
  • ALERTSVC.EXE
  • amon.exe
  • ANTITROJAN.EXE
  • ANTI-TROJAN.EXE
  • ANTS.EXE
  • APVXDWIN.EXE
  • AUTODOWN.EXE
  • AVCONSOL.EXE
  • AVE32.EXE
  • AVGCTRL.EXE
  • AVKSERV.EXE
  • AVNT.EXE
  • AVP.EXE
  • AVP32.EXE
  • AVPCC.EXE
  • AVPDOS32.EXE
  • AVPM.EXE
  • AVPTC32.EXE
  • AVPUPD.EXE
  • AVSCHED32.EXE
  • AVWIN95.EXE
  • AVWUPD32.EXE
  • BLACKD.EXE
  • BLACKICE.EXE
  • bot.exe
  • CCAPP.EXE
  • CCEVTMGR.EXE
  • CCPXYSVC.EXE
  • CFIADMIN.EXE
  • CFIAUDIT.EXE
  • CFINET.EXE
  • CFINET32.EXE
  • CLAW95.EXE
  • CLAW95CF.EXE
  • CLEANER.EXE
  • CLEANER3.EXE
  • COMMVIEW.EXE
  • COMMVIEW32.EXE
  • CONNECTIONMONITOR.EXE
  • CPD.EXE
  • CPDCLNT.EXE
  • dcomx.exe
  • DEFWATCH.EXE
  • DFW.EXE
  • drweb.exe
  • Drweb32w.exe
  • drweb386.exe
  • Drwebupw.exe
  • Drwebwcl.exe
  • DUMP.EXE
  • DUMP1.EXE
  • DUMPED.EXE
  • DUMPED1.EXE
  • DVP95.EXE
  • DVP95_0.EXE
  • ECENGINE.EXE
  • EETHERCAP.EXE
  • EETHERCAP32.EXE
  • enbiei.exe
  • ESAFE.EXE
  • ESPWATCH.EXE
  • ETHERCAP.EXE
  • ETHERCAP32.EXE
  • EXPLORER32.EXE
  • F-AGNT95.EXE
  • FINDVIRU.EXE
  • FPROT.EXE
  • F-PROT.EXE
  • F-PROT95.EXE
  • FP-WIN.EXE
  • FRW.EXE
  • F-STOPW.EXE
  • GUARDDOG.EXE
  • IAMAPP.EXE
  • IAMSERV.EXE
  • IBMASN.EXE
  • IBMAVSP.EXE
  • ICLOAD95.EXE
  • ICLOADNT.EXE
  • ICMON.EXE
  • ICSUPP95.EXE
  • ICSUPPNT.EXE
  • IFACE.EXE
  • index.exe
  • IOMON98.EXE
  • IRIS.EXE
  • JEDI.EXE
  • KILL.EXE
  • KILLER.EXE
  • KPF4GUI.EXE
  • KPF4SS.EXE
  • LDNETMON.EXE
  • LOCKDOWN.EXE
  • LOCKDOWN2000.EXE
  • lolx.exe
  • LOOKOUT.EXE
  • LordPE.EXE
  • LordPE32.EXE
  • LUALL.EXE
  • MINILOG.EXE
  • MOOLIVE.EXE
  • MPFTRAY.EXE
  • MSBLAST.EXE
  • MSCONFIG.EXE
  • mslaugh.exe
  • mspatch.exe
  • N32SCANW.EXE
  • NAVAPSVC.EXE
  • NAVAPW32.EXE
  • NAVLU32.EXE
  • NAVNT.EXE
  • NAVW32.EXE
  • NAVWNT.EXE
  • NDD32.EXE
  • NETSTAT.EXE
  • NETUTILS.EXE
  • NISSERV.EXE
  • NISUM.EXE
  • NMAIN.EXE
  • nod.exe
  • nod32.exe
  • NORMIST.EXE
  • NPROTECT.EXE
  • NPSSVC.EXE
  • NTVDM.EXE
  • NUPGRADE.EXE
  • NVC95.EXE
  • NVSVC32.EXE
  • NWTOOL16.EXE
  • OUTPOST.EXE
  • PADMIN.EXE
  • PAVCL.EXE
  • PAVSCHED.EXE
  • PAVW.EXE
  • PCCWIN98.EXE
  • PCFWALLICON.EXE
  • penis32.exe
  • PERSFW.EXE
  • PM.exe
  • POPROXY.EXE
  • PORTMONITOR.EXE
  • PRKILLER.EXE
  • PROC.EXE
  • PROCDUMP.EXE
  • PROCDUMP32.EXE
  • PROCEXP.EXE
  • PROCEXP32.EXE
  • PS.EXE
  • PSKILL.EXE
  • PSLIST.EXE
  • RAV7.EXE
  • RAV7WIN.EXE
  • REGEDIT.EXE
  • RESCUE.EXE
  • root32.exe
  • rpc.exe
  • rpctest.exe
  • RTVSCN95.EXE
  • RUNDDL31.EXE
  • SAFEWEB.EXE
  • SCAN32.EXE
  • SCAN95.EXE
  • SCANPM.EXE
  • SCRSCAN.EXE
  • scvhost.exe
  • SERV95.EXE
  • SMC.EXE
  • SPHINX.EXE
  • spider.exe
  • Spiderml.exe
  • spidernt.exe
  • SWEEP95.EXE
  • SWNETSUP.EXE
  • SymProxySvc.exe
  • SYSCFG32.EXE
  • SYSOTRAY32.EXE
  • TASKKILL.EXE
  • TASKLIST.EXE
  • TASKMGR.EXE
  • TBSCAN.EXE
  • TC.EXE
  • TCA.EXE
  • TCM.EXE
  • TCPDUMP.EXE
  • TCPDUMP32.EXE
  • TDS2-98.EXE
  • TDS2-NT.EXE
  • teekids.exe
  • tftpd.exe
  • VET95.EXE
  • VETTRAY.EXE
  • VPC32.EXE
  • VPTRAY.EXE
  • VSCAN40.EXE
  • VSECOMR.EXE
  • VSHWIN32.EXE
  • VSMON.EXE
  • VSSTAT.EXE
  • WEBSCANX.EXE
  • WFINDV32.EXE
  • WINDRIVER.EXE
  • WINEXEC.EXE
  • WINHEX.EXE
  • WINSOCK2.2.EXE
  • worm.exe
  • WRADMIN.EXE
  • WRCTRL.EXE
  • ZAPRO.EXE
  • zlclient.exe
  • ZLCLIENT.EXE
  • ZONEALARM.EXE

Information Theft

This malware steals CD keys of various software on the system.

Below is the list of software that this malware steals CD keys from:

  • Battlefield 1942
  • Battlefield 1942 The Road to Rome
  • Battlefield Vietnam
  • Command & Conquer Generals
  • Counter-Strike Retail
  • FIFA 2003
  • Half-Life
  • Microsoft Windows
  • Need For Speed Hot Pursuit 2
  • Neverwinter
  • Project IGI 2
  • Rainbow Six III RavenShield
  • Soldier of Fortune II - Double Helix
  • Unreal Tournament 2003
  • Unreal Tournament 2004

Backdoor Capabilities

This worm opens a random port and connects to the Internet Relay Chat (IRC) server LONDON.UK.EU.UNDERNET.ORG. It joins the channel #TIKA where it listens for commands from a remote malicious user.

Some of the commands it can perform on the system are:

  • Attempt email spoofing
  • Capture screen of the target machine
  • Create a clone of the Bot
  • Disable Network shares
  • Download, read, open, and execute a file
  • Flood a specific target host:
    • SYN flood
    • UDP flood
    • PING flood
  • Gather CD keys of various software on the system
  • Get system information like:
    • CPU information
    • memory information
    • Windows version
    • Dial-Up connection
    • IP address
    • Internet Provider
  • Join/Part a channel
  • Port scanning
  • Update a copy of itself

Other Details

These text strings are visible on the malware�s body:

� D-Bot
� Distributed Denial of Service Network Attack Suite. Vax Release by it



Analysis by: Gerald Carsula

Revision History:

First pattern file version: 1.856.16
First pattern file release date: Apr 12, 2004

SOLUTION


Minimum scan engine version needed: 7.500

Pattern file needed: 4.955.00

Pattern release date: Jan 21, 2008


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Malware Program

Before proceeding to remove this malware, first identify the malware program.

Scan your system with Trend Micro antivirus and NOTE all files detected as WORM_SDBOT.LM To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.

Restarting in Safe Mode

� On Windows 95

  1. Restart your computer.
  2. Press F8 at the Starting Windows 95 message.
  3. Choose Safe Mode from the Windows 95 Startup Menu then press Enter.

� On Windows 98 and ME

  1. Restart your computer.
  2. Press the CTRL key until the startup menu appears.
  3. Choose the Safe Mode option then press Enter.

� On Windows NT (VGA mode)

  1. Click Start>Settings>Control Panel.
  2. Double-click the System icon.
  3. Click the Startup/Shutdown tab.
  4. Set the Show List field to 10 seconds and click OK to save this change.
  5. Shut down and restart your computer.
  6. Select VGA mode from the startup menu.

� On Windows 2000

  1. Restart your computer.
  2. Press the F8 key, when you see the Starting Windows bar at the bottom of the screen.
  3. Choose the Safe Mode option from the Windows Advanced Options Menu then press Enter.

� On Windows XP

  1. Restart your computer.
  2. Press F8 after the Power-On Self Test (POST) is done. If the Windows Advanced Options Menu does not appear, try restarting and then pressing F8 several times after the POST screen.
  3. Choose the Safe Mode option from the Windows Advanced Options Menu then press Enter.

Note: After performing all the solutions for the removal of this malware, please restart your system normally, and run your Trend Micro antivirus product.

Editing the Registry

This malware modifies the system's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

  1. HOW TO: Backup, Edit, and Restore the Registry in Windows 95, Windows 98, and Windows ME
  2. HOW TO: Backup, Edit, and Restore the Registry in Windows NT 4.0
  3. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
  4. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and 2003

Removing Autostart Entries from the Registry

Removing autostart entries from registry prevents the malware from executing during startup. This is also an effective way to terminate its process. In this procedure, you will need the name/s of the file/s detected earlier.

  1. Open Registry Editor. Click Start>Run, type Regedit then hit Enter.
  2. In the left panel, double click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    Microsoft Digital Cryptors = "mdigits.exe"
  4. Again in the left panel, double click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete the entry:
    Microsoft Digital Cryptors = "mdigits.exe"
  6. Close Registry Editor.
NOTE: If you were not able to terminate the malware process from memory as described in the previous procedure, restart your system.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure set(s).

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete files detected as WORM_SDBOT.LM. To do this, Trend Micro customers must download the latest virus pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's online virus scanner.




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