BKDR_CYCBOT.NYZ
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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
287,232 bytes
Yes
25 Nov 2011
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system:
- %Program Files%\LP\7CCB\C29.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It drops the following files:
- %Application Data%\B0B2D\D6E3.0B2
- %Application Data%\Microsoft\CryptnetUrlCache\Content\A44F4E7CB3133FF765C39A53AD8FCFDD
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\A44F4E7CB3133FF765C39A53AD8FCFDD
- %Application Data%\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004
- %Application Data%\Microsoft\CryptnetUrlCache\Content\696F3DE637E6DE85B458996D49D759AD
- %Application Data%\Microsoft\CryptnetUrlCache\Content\7B2238AACCEDC3F1FFE8E7EB5F575EC9
- %Application Data%\Microsoft\CryptnetUrlCache\Content\A1377F7115F1F126A15360369B165211
- %Application Data%\Microsoft\CryptnetUrlCache\Content\A8FABA189DB7D25FBA7CAC806625FD30
- %Application Data%\Microsoft\CryptnetUrlCache\Content\C554DCF706A5AAB8B360FAD227EAB9C7
- %Application Data%\Microsoft\CryptnetUrlCache\Content\E8974A4669383843486E5AFDB09650F5
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\696F3DE637E6DE85B458996D49D759AD
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\7B2238AACCEDC3F1FFE8E7EB5F575EC9
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\A1377F7115F1F126A15360369B165211
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\A8FABA189DB7D25FBA7CAC806625FD30
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\C554DCF706A5AAB8B360FAD227EAB9C7
- %Application Data%\Microsoft\CryptnetUrlCache\MetaData\E8974A4669383843486E5AFDB09650F5
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It creates the following folders:
- %Application Data%\B0B2D
- %Program Files%\2D6E3
- %Program Files%\LP
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
C29.exe = "%Program Files%\LP\7CCB\C29.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\0open
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\0open
HWID = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyServer = "http=127.0.0.1:57677"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyEnable = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_CURRENT_CONFIG\Software\Microsoft\
windows\CurrentVersion\Internet Settings
ProxyEnable = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Hardware Profiles\0001\Software\
Microsoft\windows\CurrentVersion\
Internet Settings
ProxyEnable = "1"
(Note: The default value data of the said registry entry is 0.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Hardware Profiles\Current\Software\
Microsoft\windows\CurrentVersion\
Internet Settings
ProxyEnable = "1"
(Note: The default value data of the said registry entry is 0.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc