TROJ_FAKR.BC
ERROR (Sunbelt); Adware.Kraddare.CQ (FSecure)
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:
- %Application Data%\rolypop
(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.)
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
rolypopv3 = "%Application Data%\rolypop\rolypops.exe"
It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\explorer\
Browser Helper Objects\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
Other System Modifications
This Trojan deletes the following files:
- %Application Data%\rolypop\tmp1.tmp
- %User Temp%\DZ_2.tmp
(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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
rolypop
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\App Management\
ARPCache\rolypop
HKEY_CURRENT_USER\Software\rolypoppp
HKEY_CLASSES_ROOT\CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
HKEY_CLASSES_ROOT\CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}\
InprocServer32
HKEY_CLASSES_ROOT\rolypop.P
HKEY_CLASSES_ROOT\rolypop.P\Clsid
HKEY_CLASSES_ROOT\CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}\
ProgID
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
rolypop
DisplayName = "Win Search for rolypop"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
rolypop
UninstallString = "%Application Data%\rolypop\uninstall.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\App Management\
ARPCache\rolypop
Changed = "{random values}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\App Management\
ARPCache\rolypop
SlowInfoCache = "{random values}"
HKEY_CURRENT_USER\Software\rolypoppp
pid = "p1"
HKEY_CURRENT_USER\Software\rolypoppp
ver = "1.0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
NoExplorer = "1"
Dropping Routine
This Trojan drops the following files:
- %System%\sircheckfile.dat
- %System%\rolypop.ppp
- %User Temp%\DZ_2.dll
- %Application Data%\rolypop\rolypop.dll
- %Application Data%\rolypop\evdat2.dmc
- %Application Data%\rolypop\rolypops.exe
- %Application Data%\rolypop\uninstall.exe
- %Application Data%\rolypop\updata.ini
- %System Root%\123.bat
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Other Details
This Trojan deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Close all opened browser windows
Step 4
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
- rolypop
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Management\ARPCache
- rolypop
- In HKEY_CURRENT_USER\Software
- rolypoppp
- In HKEY_CLASSES_ROOT\CLSID
- {556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
- In HKEY_CLASSES_ROOT\CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
- InprocServer32
- In HKEY_CLASSES_ROOT
- rolypop.P
- In HKEY_CLASSES_ROOT\rolypop.P
- Clsid
- In HKEY_CLASSES_ROOT\CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
- ProgID
Step 5
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
- rolypopv3 = "%Application Data%\rolypop\rolypops.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\rolypop
- DisplayName = "Win Search for rolypop"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\rolypop
- UninstallString = "%Application Data%\rolypop\uninstall.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Management\ARPCache\rolypop
- Changed = "{random values}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Management\ARPCache\rolypop
- SlowInfoCache = "{random values}"
- In HKEY_CURRENT_USER\Software\rolypoppp
- pid = "p1"
- In HKEY_CURRENT_USER\Software\rolypoppp
- ver = "1.0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{556F50CF-FDBD-41B0-BA02-E4AF2F9385EC}
- NoExplorer = "1"
Step 6
Search and delete these files
- %System%\sircheckfile.dat
- %System%\rolypop.ppp
- %User Temp%\DZ_2.dll
- %Application Data%\rolypop\rolypop.dll
- %Application Data%\rolypop\evdat2.dmc
- %Application Data%\rolypop\rolypops.exe
- %Application Data%\rolypop\uninstall.exe
- %Application Data%\rolypop\updata.ini
- %System Root%\123.bat
Step 7
Search and delete this folder
- %Application Data%\rolypop
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKR.BC. 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 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %Application Data%\rolypop\tmp1.tmp
- %User Temp%\DZ_2.tmp
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