Backdoor.Win32.Kelihos_4e10989848

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

4e10989848ab77730e0b495d429adfbc.exe:1676

The Backdoor injects its code into the following process(es):

temp178934759.exe:420

File activity

The process 4e10989848ab77730e0b495d429adfbc.exe:1676 makes changes in a file system.

The Backdoor creates and/or writes to the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\temp178934759.exe (3901 bytes)

The process temp178934759.exe:420 makes changes in a file system.

The Backdoor deletes the following file(s):

%Documents and Settings%\%current user%\Local Settings\Temp\tmp.exe (0 bytes)

Registry activity

The process 4e10989848ab77730e0b495d429adfbc.exe:1676 makes changes in a system registry.

The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "BD F0 07 9D D2 55 4C 89 94 66 A7 56 4C 5F AB F4"

[HKLM\SOFTWARE\Microsoft\Direct3D\MostRecentApplication]
"Name" = "4e10989848ab77730e0b495d429adfbc.exe"

The process temp178934759.exe:420 makes changes in a system registry.

The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "9E C6 D6 A5 C9 F4 F3 2C FE A2 98 F0 91 8A C6 1F"

[HKCU\Software\Microsoft\Notepad]
"sizeCompletedValid" = "DJhMyb3kmYyLRWYd4u9APXTr6nzz6/SwrmfnNnnhOufW73kxkpdVZhe5D4uDla3Cnw=="

[HKCU\Software\Sysinternals\Process Monitor]
"UrlEnabledUse" = "80"

[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"EnableStationQueries" = "1"

[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"ComputerName" = "XP10"

[HKCU\Software\Microsoft\Notepad]
"infoPlayedCurrent" = "00 00 00 00 00 00 00 00"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Local AppData" = "%Documents and Settings%\%current user%\Local Settings\Application Data"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"DBSavedUse" = "A2 49 4D F3 D9 1E 9F 88 01 01 08 61 00 02 01 10"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Common AppData" = "%Documents and Settings%\All Users\Application Data"

[HKCU\Software\Sysinternals\Process Monitor]
"FlagsModifiedValid" = "00 00 00 00 00 00 00 00"

[HKCU\Software\Microsoft\Notepad]
"styleModifiedPrev" = "80"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"AppData" = "%Documents and Settings%\%current user%\Application Data"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"PlatformCompressedValid" = "00 00 00 00 00 00 00 00"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"PersistentLocalizedName" = "D5 80 F9 7F 7A F6 33 7C E4 4B 42 21 12 05 A5 B9"

[HKCU\Software\Sysinternals\Process Monitor]
"DefaultCompressedRecord" = "D5 80 F9 7F 73 12 09 0D 9F 66 E3 5E EE C6 92 9F"

[HKCU\Software\Microsoft\Notepad]
"activeModifiedTheme" = "D5 80 F9 7F 87 DF D4 9D CA 38 10 D6 4A AD 37 33"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"RecordEnabledCheck" = "80"

[HKCU\Software\Sysinternals\Process Monitor]
"RecordModifiedMax" = "DJhMyb3kmYyLRWYd4u9APXTr6nzz6/SwrmfnNnnhOufW73kxkpdVZhe5D4uDla3Cnw=="

[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"UserName" = "%CurrentUserName%"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"LineLoadedQuick" = "DJhMyb3kmYyLRWYd4u9APXTr6nzz6/SwrmfnNnnhOufW73kxkpdVZhe5D4uDla3Cnw=="

To automatically run itself each time Windows is booted, the Backdoor adds the following link to its file to the system registry autorun key:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"NetworkUpdater" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\temp178934759.exe"

Network activity (URLs)

URL	IP
hxxp://222.230.176.97/dun0005.exe (Malicious)

Rootkit activity

No anomalies have been detected.

Propagation

Removals

Remove it with Ad-Aware

1. Click (here) to download and install Ad-Aware Free Antivirus.
2. Update the definition files.
3. Run a full scan of your computer.

Manual removal*

1. Terminate malicious process(es) (How to End a Process With the Task Manager):

   4e10989848ab77730e0b495d429adfbc.exe:1676
   

2. Delete the original Backdoor file.
   
3. Delete or disinfect the following files created/modified by the Backdoor:

   %Documents and Settings%\%current user%\Local Settings\Temp\temp178934759.exe (3901 bytes)

4. Delete the following value(s) in the autorun key (How to Work with System Registry):

   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "NetworkUpdater" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\temp178934759.exe"

5. Clean the Temporary Internet Files folder, which may contain infected files (How to clean Temporary Internet Files folder).
   
6. Reboot the computer.
   

*Manual removal may cause unexpected system behaviour and should be performed at your own risk.

Static Analysis

Network Activity

Map

Strings from Dumps