Prevx Research Division
COMBOFIX.EXE
Suspicious SoftwareIt is possible that your PC could be infected. The file name COMBOFIX.EXE is used by both safe and unsafe programs.
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File Behavior
COMBOFIX.EXE has been seen to perform the following behavior:
- The Process is packed and/or encrypted using a software packing process
- This process creates other processes on disk
- Executes a Process
- This Process Deletes Other Processes From Disk
- Adds products to the system registry
- Writes to another Process's Virtual Memory (Process Hijacking)
- Creates system tray popups, messages, errors and security warnings
- Opens browser pop ups
- Creates new folders on the system
- Injects code into other processes
- Found on infected systems and resists interrogation by security products
- Uses low level functions to hide itself from the user and from system/security processes
COMBOFIX.EXE has been the subject of the following behavior:
- Created as a process on disk
- Executed as a Process
- Executed by Internet Explorer
- Has code inserted into its Virtual Memory space by other programs
- Deleted as a process from disk
- Terminated as a Process
- Created by processes which appear to be checking for interception by security products
Country Of Origin
The filename COMBOFIX.EXE was first seen on May 31 2007 in the following geographical regions of the Webroot community:
- The United States on May 31 2007
- Morocco on May 31 2007
- Spain on Nov 7 2007
- on Nov 7 2007
- Italy on Jun 9 2008
- Lithuania on Jun 9 2008
- Europe on Nov 7 2008
- Turkey on May 20 2013
File Name Aliases
COMBOFIX.EXE can also use the following file names:
- COMBOFIX[1].EXE
- YJ9CO10I.EXE
- COMBOFIX(2).EXE
- COIX.EXE
- ABCDEFG.EXE
- COMBOFIX(1).EXE
- COMBOFIX.EXE.EXE
- COMBO-FIX.EXE
- PROVA.EXE.EXE
- ABC.EXE
- FIX.EXE
- COMBOFFIX.EXE
- COMBOF2.EXE
- COMBOFIX (1).EXE
- COMFI.EXE
- DES.EXE
- COMBOFIX[n].EXE
- COMBOFIX(n).EXE
- KKOMBOFIX.EXE
- CBFIX.EXE
- COMBOFIX (ANTI-HIJACKER).EXE
- TDYTD.EXE
- COMBOFIX3.EXE
- SFSDTDGDG.EXE
- V.EXE
- JO.EXE
- CX.EXE
- DC1.EXE
- DF1.EXE
- 4UCAVCGA.EXE
- DG29.EXE
- DE2.EXE
- COMBOFIX.EXE.PART
- C2152591D01
- DC2.EXE
- DC5.EXE
- 31061483.EXE
- 48557729.EXE
Filesizes
The following file size has been seen:
- 1,539,258 bytes
- 848,702 bytes
- 26,112 bytes
- 1,088,077 bytes
- 1,959,843 bytes
- 5,067,850 bytes
- 3,043,976 bytes
File Type
The filename COMBOFIX.EXE is used by multiple object types including self extracting compressed files,objects,executable programs.
File Activity
One or more files with the name COMBOFIX.EXE creates, deletes, copies or moves the following files and folders:
- Deletes c:\327882r2fwjfw\temp00.bat
- Copies filec:\windows\system32\findstr.exe to findstr.cfe
- Copies filec:\windows\system32\attrib.exe to attrib.cfe
- Copies filec:\windows\system32\cmd.exe to c:\windows\system32\CF17490.exe
- Deletes c:\327882r2fwjfw\NirCmd.inf
- Deletes c:\327882r2fwjfw\FileName
- Deletes c:\327882r2fwjfw\DIRNAM~1
- Deletes c:\Start_.cmd
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