TROJ_FAKEAV.LKV
PWS:Win32/Zbot.gen!AM (Microsoft); Packed.Generic.402 (Symantec); Trojan.Win32.Winwebsec.mdc (v) (Sunbelt); Cryptic (AVG)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan 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
Arrival Details
This Trojan 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 Trojan creates the following folders:
- %User Profile%\Application Data\Bike
(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 Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Bike\ubob.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = "1"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
329fa8i3 = "f13fd3bf"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
365bc06d = "r9Nl8RIKvzh3+PTcmWM=?_CHAR(0x06)_?"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
329fa8i3 = "/tM/8Q==?_CHAR(0x03)_ r?S?Ss reserved."
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
14881:UDP = "14881:UDP:*:Enabled:UDP 14881"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
18534:TCP = "18534:TCP:*:Enabled:TCP 18534"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
13cc18j3 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
2e523i7a = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
1eceh966 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
1eceh966 = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
2e523i7a = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
3017fg1j = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
10f1i0bg = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
34hihj15 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Nyowlu
329fa8i3 = "/9M/8Q==Í_CHAR(0x03)_?"
It modifies the following registry entries:
HKEY_CURRENT_USER\Identities
Last Username = "Main Identity"
(Note: The default value data of the said registry entry is Main Identity.)
HKEY_CURRENT_USER\Identities
Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
(Note: The default value data of the said registry entry is {C0FE0177-5693-4537-9331-A7402AD82D40}.)
HKEY_CURRENT_USER\Identities
Identity Login = "9853"
(Note: The default value data of the said registry entry is 98053.)
HKEY_CURRENT_USER\Identities
Identity Ordinal = "2"
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\Bike
- %User Profile%\Bike\ubob.exe
- %Application Data%\ipjee.ciu
(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 Trojan deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
- Nyowlu
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
- {58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Bike\ubob.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Server ID = "4"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- FirstRun = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- OlkContactRefresh = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- OlkFolderRefresh = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 329fa8i3 = "f13fd3bf"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 365bc06d = "r9Nl8RIKvzh3+PTcmWM=?_CHAR(0x06)_?"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 329fa8i3 = "/tM/8Q==?_CHAR(0x03)_ r?S?Ss reserved."
- 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
- 14881:UDP = "14881:UDP:*:Enabled:UDP 14881"
- 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
- 18534:TCP = "18534:TCP:*:Enabled:TCP 18534"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 13cc18j3 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 2e523i7a = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 1eceh966 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 1eceh966 = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 2e523i7a = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 3017fg1j = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 10f1i0bg = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 34hihj15 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Nyowlu
- 329fa8i3 = "/9M/8Q==Í_CHAR(0x03)_?"
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: Last Username = "Main Identity"
To: Last Username = ""Main Identity""
- From: Last Username = "Main Identity"
- In HKEY_CURRENT_USER\Identities
- From: Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
To: Last User ID = ""{C0FE0177-5693-4537-9331-A7402AD82D40}""
- From: Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
- In HKEY_CURRENT_USER\Identities
- From: Identity Login = "9853"
To: Identity Login = ""98053""
- From: Identity Login = "9853"
- 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\Bike
- %User Profile%\Bike\ubob.exe
- %Application Data%\ipjee.ciu
Step 7
Search and delete this folder
- %User Profile%\Application Data\Bike
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.LKV. 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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