TSPY_TEPFER.AMN
PWS:Win32/Zbot (Microsoft); Trojan-Spy.Win32.Zbot.izqt (Kaspersky)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes itself after execution.
TECHNICAL DETAILS
309,760 bytes
EXE
Yes
08 May 2013
Arrival Details
This spyware 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 spyware creates the following folders:
- %User Profile%\Application Data\Zaatfo
- %User Profile%\Microsoft\Address Book
(Note: %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.)
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{C8B0FB29-AD41-AD40-5C09-405F58D6634D} = "%User Profile%\Zaatfo\xudiu.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Kiirsu
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\Wab File Name
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Kiirsu
1a274g = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Kiirsu
4jae832 = "5e5a57f2"
HKEY_CURRENT_USER\Software\Microsoft\
Kiirsu
4jae832 = "5e5a57f3"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
19651:UDP = "19651:UDP:*:Enabled:UDP 19651"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
26022:TCP = "26022:TCP:*:Enabled:TCP 26022"
HKEY_CURRENT_USER\Software\Microsoft\
Kiirsu
23e1ghai = "IRtaXvVIxjhm+TQf?_CHAR(0x05)_lF?t?tame"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Server ID = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Server ID = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Server ID = "2"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Server ID = "3"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts
PreConfigVer = "4"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts
PreConfigVerNTDS = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
Account Name = "Active Directory"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Server = "NULL"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Search Return = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Timeout = "3c"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Authentication = "2"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Simple Search = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Bind DN = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Port = "cc4"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Resolve Flag = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Secure Connection = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP User Name = "NULL"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Active Directory GC
LDAP Search Base = "NULL"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
Account Name = "Bigfoot Internet Directory Service"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Server = "ldap.bigfoot.com"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP URL = "http://www.{BLOCKED}t.com"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Search Return = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Timeout = "3c"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Authentication = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Simple Search = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\Bigfoot
LDAP Logo = "%ProgramFiles%\Common Files\Services\bigfoot.bmp"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
Account Name = "VeriSign Internet Directory Service"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Server = "directory.verisign.com"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP URL = "http://www.{BLOCKED}gn.com"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Search Return = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Timeout = "3c"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Authentication = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Search Base = "NULL"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Simple Search = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\VeriSign
LDAP Logo = "%ProgramFiles%\Common Files\Services\verisign.bmp"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
Account Name = "WhoWhere Internet Directory Service"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Server = "ldap.whowhere.com"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP URL = "http://www.{BLOCKED}re.com"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Search Return = "64"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Timeout = "3c"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Authentication = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Simple Search = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts\WhoWhere
LDAP Logo = "%ProgramFiles%\Common Files\Services\whowhere.bmp"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Default LDAP Account = "Active Directory GC"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"
HKEY_CURRENT_USER\Identities\{8A24C031-62FE-4BF5-94F0-BFD4FBCD674B}
Identity Ordinal = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Kiirsu
4jae832 = "s1daXg==?? "
It modifies the following registry entries:
HKEY_CURRENT_USER\Identities
Identity Ordinal = "2"
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This spyware drops the following files:
- %User Profile%\Application Data\Zaatfo
- %User Profile%\Zaatfo\xudiu.exe
- %Application Data%\beti.vyi
- %User Profile%\Address Book\Wilbert.wab
(Note: %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.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Other Details
This spyware deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Delete this registry key
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_CURRENT_USER\Software\Microsoft
- Kiirsu
- In HKEY_CURRENT_USER\Software\Microsoft
- Internet Account Manager
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Accounts
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- Active Directory GC
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- Bigfoot
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- VeriSign
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- WhoWhere
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- Wab File Name
Step 4
Delete this 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {C8B0FB29-AD41-AD40-5C09-405F58D6634D} = "%User Profile%\Zaatfo\xudiu.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Kiirsu
- 1a274g = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Kiirsu
- 4jae832 = "5e5a57f2"
- In HKEY_CURRENT_USER\Software\Microsoft\Kiirsu
- 4jae832 = "5e5a57f3"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- 19651:UDP = "19651:UDP:*:Enabled:UDP 19651"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- 26022:TCP = "26022:TCP:*:Enabled:TCP 26022"
- In HKEY_CURRENT_USER\Software\Microsoft\Kiirsu
- 23e1ghai = "IRtaXvVIxjhm+TQf?_CHAR(0x05)_lF?t?tame"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Server ID = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Server ID = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Server ID = "2"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Server ID = "3"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Server ID = "4"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- PreConfigVer = "4"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- PreConfigVerNTDS = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- Account Name = "Active Directory"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Server = "NULL"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Search Return = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Timeout = "3c"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Authentication = "2"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Simple Search = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Bind DN = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Port = "cc4"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Resolve Flag = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Secure Connection = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP User Name = "NULL"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
- LDAP Search Base = "NULL"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- Account Name = "Bigfoot Internet Directory Service"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Server = "ldap.bigfoot.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP URL = "http://www.{BLOCKED}t.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Search Return = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Timeout = "3c"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Authentication = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Simple Search = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
- LDAP Logo = "%ProgramFiles%\Common Files\Services\bigfoot.bmp"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- Account Name = "VeriSign Internet Directory Service"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Server = "directory.verisign.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP URL = "http://www.{BLOCKED}gn.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Search Return = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Timeout = "3c"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Authentication = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Search Base = "NULL"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Simple Search = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
- LDAP Logo = "%ProgramFiles%\Common Files\Services\verisign.bmp"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- Account Name = "WhoWhere Internet Directory Service"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Server = "ldap.whowhere.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP URL = "http://www.{BLOCKED}re.com"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Search Return = "64"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Timeout = "3c"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Authentication = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Simple Search = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
- LDAP Logo = "%ProgramFiles%\Common Files\Services\whowhere.bmp"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Default LDAP Account = "Active Directory GC"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- OlkContactRefresh = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- OlkFolderRefresh = "0"
- In HKEY_CURRENT_USER\Identities\{8A24C031-62FE-4BF5-94F0-BFD4FBCD674B}
- Identity Ordinal = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Kiirsu
- 4jae832 = "s1daXg==?? "
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Identities
- From: Identity Ordinal = "2"
To: Identity Ordinal = ""1""
- From: Identity Ordinal = "2"
Step 6
Search and delete these components
- %User Profile%\Application Data\Zaatfo
- %User Profile%\Zaatfo\xudiu.exe
- %Application Data%\beti.vyi
- %User Profile%\Address Book\Wilbert.wab
Step 7
Search and delete these folders
- %User Profile%\Application Data\Zaatfo
- %User Profile%\Microsoft\Address Book
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_TEPFER.AMN. 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.
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