WORM_SDBOT.CEM

Step 1
For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2
Terminate this process

1. For Windows 98 and ME users, the Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3
Delete this registry value This step allows you to delete the registry value created by the malware.

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  • Windows Update=host.exe
    
• In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
  • Windows Update=host.exe
    
• In HKEY_CURRENT_USER\Software\Microsoft\OLE
  • Windows Update=host.exe
    
• In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
  • MaxConnectionsPer1_0Server=80
    
• In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
  • MaxConnectionsPerServer=80
    
• In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
  • EnableRemoteConnect=N
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT1.0\Server
  • Enabled=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
  • AutoShareWks=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
  • AutoShareServer=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TCP1320Opts=3
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • KeepAliveTime=144000
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • BcastQueryTimeout=750
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • BcastNameQueryCount=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • CacheTimeout=60000
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • Size/Small/Medium/Large=3
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • LargeBufferSize=4096
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • SynAckProtect=2
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • PerformRouterDiscovery=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • EnablePMTUBHDetect=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • FastSendDatagramThreshold=1024
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • StandardAddressLength=24
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DefaultReceiveWindow=16384
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DefaultSendWindow=16384
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • BufferMultiplier=512
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • PriorityBoost=2
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • IrpStackSize=4
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • IgnorePushBitOnReceives=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DisableAddressSharing=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • AllowUserRawAccess=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DisableRawSecurity=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DynamicBacklogGrowthDelta=50
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • FastCopyReceiveThreshold=1024
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • LargeBufferListDepth=10
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxActiveTransmitFileCount=2
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxFastTransmit=64
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • OverheadChargeGranularity=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • SmallBufferListDepth=32
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • SmallerBufferSize=128
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TransmitWorker=32
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DNSQueryTimeouts={random hex values}
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DefaultRegistrationTTL=20
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DisableReplaceAddressesInConflicts=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DisableReverseAddressRegistrations=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • UpdateSecurityLevel=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • QueryIpMatching=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • NoNameReleaseOnDemand=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • EnableDeadGWDetect=0
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • EnableFastRouteLookup=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxFreeTcbs=2000
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxHashTableSize=2048
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • SackOpts=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • Tcp1323Opts=3
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TcpMaxDupAcks=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TcpRecvSegmentSize=1413
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TcpSendSegmentSize=1413
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • DefaultTTL=48
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TcpMaxHalfOpen=75
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • TcpMaxHalfOpenRetried=80
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxNormLookupMemory=200000
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • FFPControlFlags=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • FFPFastForwardingCacheSize=200000
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxForwardBufferMemory=105975
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • MaxFreeTWTcbs=2000
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • GlobalMaxTcpWindowSize=512512
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • EnablePMTUDiscovery=1
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
  • ForwardBufferMemory=105975
    

To delete the registry value this malware created:

1. Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
2. In the left panel of the Registry Editor window, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run
3. In the right panel, locate and delete the entry:
   Windows Update=host.exe
4. In the left panel of the Registry Editor window, double-click the following:
   HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>RunServices
5. In the right panel, locate and delete the entry:
   Windows Update=host.exe
6. In the left panel of the Registry Editor window, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>OLE
7. In the right panel, locate and delete the entry:
   Windows Update=host.exe
8. In the left panel of the Registry Editor window, double-click the following:
   HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Internet Settings
9. In the right panel, locate and delete the entry:
   MaxConnectionsPer1_0Server=80
10. In the left panel of the Registry Editor window, double-click the following:
    HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Internet Settings
11. In the right panel, locate and delete the entry:
    MaxConnectionsPerServer=80
12. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Ole
13. In the right panel, locate and delete the entry:
    EnableRemoteConnect=N
14. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Control>SecurityProviders>SCHANNEL>Protocols>PCT1.0>Server
15. In the right panel, locate and delete the entry:
    Enabled=0
16. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>lanmanserver>parameters
17. In the right panel, locate and delete the entry:
    AutoShareWks=0
18. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>lanmanserver>parameters
19. In the right panel, locate and delete the entry:
    AutoShareServer=0
20. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
21. In the right panel, locate and delete the entry:
    TCP1320Opts=3
22. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
23. In the right panel, locate and delete the entry:
    KeepAliveTime=144000
24. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
25. In the right panel, locate and delete the entry:
    BcastQueryTimeout=750
26. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
27. In the right panel, locate and delete the entry:
    BcastNameQueryCount=1
28. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
29. In the right panel, locate and delete the entry:
    CacheTimeout=60000
30. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
31. In the right panel, locate and delete the entry:
    Size/Small/Medium/Large=3
32. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
33. In the right panel, locate and delete the entry:
    LargeBufferSize=4096
34. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
35. In the right panel, locate and delete the entry:
    SynAckProtect=2
36. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
37. In the right panel, locate and delete the entry:
    PerformRouterDiscovery=0
38. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
39. In the right panel, locate and delete the entry:
    EnablePMTUBHDetect=0
40. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
41. In the right panel, locate and delete the entry:
    FastSendDatagramThreshold=1024
42. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
43. In the right panel, locate and delete the entry:
    StandardAddressLength=24
44. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
45. In the right panel, locate and delete the entry:
    DefaultReceiveWindow=16384
46. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
47. In the right panel, locate and delete the entry:
    DefaultSendWindow=16384
48. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
49. In the right panel, locate and delete the entry:
    BufferMultiplier=512
50. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
51. In the right panel, locate and delete the entry:
    PriorityBoost=2
52. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
53. In the right panel, locate and delete the entry:
    IrpStackSize=4
54. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
55. In the right panel, locate and delete the entry:
    IgnorePushBitOnReceives=0
56. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
57. In the right panel, locate and delete the entry:
    DisableAddressSharing=0
58. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
59. In the right panel, locate and delete the entry:
    AllowUserRawAccess=0
60. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
61. In the right panel, locate and delete the entry:
    DisableRawSecurity=0
62. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
63. In the right panel, locate and delete the entry:
    DynamicBacklogGrowthDelta=50
64. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
65. In the right panel, locate and delete the entry:
    FastCopyReceiveThreshold=1024
66. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
67. In the right panel, locate and delete the entry:
    LargeBufferListDepth=10
68. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
69. In the right panel, locate and delete the entry:
    MaxActiveTransmitFileCount=2
70. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
71. In the right panel, locate and delete the entry:
    MaxFastTransmit=64
72. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
73. In the right panel, locate and delete the entry:
    OverheadChargeGranularity=1
74. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
75. In the right panel, locate and delete the entry:
    SmallBufferListDepth=32
76. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
77. In the right panel, locate and delete the entry:
    SmallerBufferSize=128
78. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
79. In the right panel, locate and delete the entry:
    TransmitWorker=32
80. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
81. In the right panel, locate and delete the entry:
    DNSQueryTimeouts={random hex values}
82. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
83. In the right panel, locate and delete the entry:
    DefaultRegistrationTTL=20
84. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
85. In the right panel, locate and delete the entry:
    DisableReplaceAddressesInConflicts=0
86. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
87. In the right panel, locate and delete the entry:
    DisableReverseAddressRegistrations=1
88. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
89. In the right panel, locate and delete the entry:
    UpdateSecurityLevel=0
90. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
91. In the right panel, locate and delete the entry:
    QueryIpMatching=0
92. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
93. In the right panel, locate and delete the entry:
    NoNameReleaseOnDemand=1
94. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
95. In the right panel, locate and delete the entry:
    EnableDeadGWDetect=0
96. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
97. In the right panel, locate and delete the entry:
    EnableFastRouteLookup=1
98. In the left panel of the Registry Editor window, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
99. In the right panel, locate and delete the entry:
    MaxFreeTcbs=2000
100. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
101. In the right panel, locate and delete the entry:
     MaxHashTableSize=2048
102. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
103. In the right panel, locate and delete the entry:
     SackOpts=1
104. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
105. In the right panel, locate and delete the entry:
     Tcp1323Opts=3
106. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
107. In the right panel, locate and delete the entry:
     TcpMaxDupAcks=1
108. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
109. In the right panel, locate and delete the entry:
     TcpRecvSegmentSize=1413
110. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
111. In the right panel, locate and delete the entry:
     TcpSendSegmentSize=1413
112. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
113. In the right panel, locate and delete the entry:
     DefaultTTL=48
114. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
115. In the right panel, locate and delete the entry:
     TcpMaxHalfOpen=75
116. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
117. In the right panel, locate and delete the entry:
     TcpMaxHalfOpenRetried=80
118. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
119. In the right panel, locate and delete the entry:
     MaxNormLookupMemory=200000
120. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
121. In the right panel, locate and delete the entry:
     FFPControlFlags=1
122. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
123. In the right panel, locate and delete the entry:
     FFPFastForwardingCacheSize=200000
124. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
125. In the right panel, locate and delete the entry:
     MaxForwardBufferMemory=105975
126. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
127. In the right panel, locate and delete the entry:
     MaxFreeTWTcbs=2000
128. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
129. In the right panel, locate and delete the entry:
     GlobalMaxTcpWindowSize=512512
130. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
131. In the right panel, locate and delete the entry:
     EnablePMTUDiscovery=1
132. In the left panel of the Registry Editor window, double-click the following:
     HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>Tcpip>Parameters
133. In the right panel, locate and delete the entry:
     ForwardBufferMemory=105975
134. Close Registry Editor.

Step 4
Restore this modified registry value This step allows you to undo a change done by the malware/grayware/spyware to a 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_LOCAL_MACHINE\SYSTEM\ControlSet\Services\wscsvc
  • From: Start=4
    To: Start=2
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
  • From: Start=4
    To: Start=3
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
  • From: Start=4
    To: Start=2
    
• In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
  • From: EnableDCOM=N
    To: EnableDCOM=Y
    
• In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
  • From: restrictanonymous=1
    To: restrictanonymous=0
    

To restore the registry value this malware/grayware/spyware modified:

1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
2. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SYSTEM>ControlSet>Services>wscsvc
3. In the right panel, locate the registry value:
   Start=4
4. Right-click on the value name and choose Modify. Change the value data of this entry to:
   Start=2
5. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SYSTEM>ControlSet>Services>wscsvc
6. In the right panel, locate the registry value:
   HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>SharedAccess
7. Right-click on the value name and choose Modify. Change the value data of this entry to:
   Start=4Start=3
8. In the left panel, double-click the following:
   HKEY_LOCAL_MACHINE>SYSTEM>ControlSet>Services>wscsvc
9. In the right panel, locate the registry value:
   HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Services>wuauserv
10. Right-click on the value name and choose Modify. Change the value data of this entry to:
    HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>OleEnableDCOM=NEnableDCOM=Y
11. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>SYSTEM>ControlSet>Services>wscsvc
12. In the right panel, locate the registry value:
    HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>Control>Lsa
13. Right-click on the value name and choose Modify. Change the value data of this entry to:
    restrictanonymous=1restrictanonymous=0
14. Close Registry Editor.

Step 5
Scan your computer with your Trend Micro product to delete files detected as WORM_SDBOT.CEM 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 6
Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors. http://www.microsoft.com/technet/security/bulletin/ms03-039.mspx
http://www.microsoft.com/technet/security/bulletin/ms03-026.mspx
http://www.microsoft.com/technet/security/bulletin/ms03-049.mspx
http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx
http://www.securityfocus.com/bid/1055/solution