Backdoor.Win32.Kelihos_375788305c

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

dwwin.exe:360
%original file name%.exe:1096

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

temp3303302130.exe:1220
temp2279324397.exe:184

File activity

The process dwwin.exe:360 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\A60AD.dmp (50612 bytes)

The process temp3303302130.exe:1220 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\5a33_appcompat.txt (1943 bytes)

The process temp2279324397.exe:184 makes changes in the file system.

The Backdoor deletes the following file(s):

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

The process %original file name%.exe:1096 makes changes in the file system.

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

%Documents and Settings%\%current user%\Local Settings\Temp\temp3303302130.exe (3914 bytes)
%Documents and Settings%\%current user%\Local Settings\Temp\temp2279324397.exe (3914 bytes)

Registry activity

The process dwwin.exe:360 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "89 12 13 16 6E E1 2B B7 AF B6 D0 D0 0E 6C 11 21"

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

[HKLM\System\CurrentControlSet\Hardware Profiles\0001\Software\Microsoft\windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache2"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CacheLimit" = "65452"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"MigrateProxy" = "1"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path1]
"CacheLimit" = "65452"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Directory" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5"

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

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path4]
"CacheLimit" = "65452"
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache4"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path3]
"CachePath" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files\Content.IE5\Cache3"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths]
"Paths" = "4"

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections]
"SavedLegacySettings" = "3C 00 00 00 14 00 00 00 01 00 00 00 00 00 00 00"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Cache" = "%Documents and Settings%\%current user%\Local Settings\Temporary Internet Files"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Cache\Paths\path2]
"CacheLimit" = "65452"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders]
"Personal" = "%Documents and Settings%\%current user%\My Documents"

Proxy settings are disabled:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"ProxyEnable" = "0"

The Backdoor deletes the following value(s) in system registry:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"AutoConfigURL"
"ProxyServer"
"ProxyOverride"

The process temp3303302130.exe:1220 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "7B F5 CD E4 2A C0 54 80 9F 61 66 4D 32 31 41 6F"

[HKLM\SOFTWARE\Microsoft\Direct3D\MostRecentApplication]
"Name" = "temp3303302130.exe"

The Backdoor deletes the following registry key(s):

[HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]

The Backdoor deletes the following value(s) in system registry:

[HKLM\SOFTWARE\Microsoft\PCHealth\ErrorReporting\DW]
"DWFileTreeRoot"

The process temp2279324397.exe:184 makes changes in the system registry.

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

[HKCU\Software\Microsoft\Notepad]
"infoPlayedCurrent" = "00 00 00 00 00 00 00 00"
"styleModifiedPrev" = "80"

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

[HKCU\Software\Microsoft\Internet Explorer\Main]
"PersistentLocalizedName" = "24 80 F9 7F 7A 8E 04 CA 2B FB 1B 7B BB 57 98 A9"
"LineLoadedQuick" = "DBmcPcMQWFhgY rGYk4QzHBeF2fxbre7VIIUcoKG7DXliQpuWQPp6tr2lCnhY0ZDPg=="

[HKCU\Software\Microsoft\Notepad]
"sizeCompletedValid" = "DBmcPcMQWFhgY rGYk4QzHBeF2fxbre7VIIUcoKG7DXliQpuWQPp6tr2lCnhY0ZDPg=="

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

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

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

[HKCU\Software\Microsoft\Internet Explorer\Main]
"DBSavedUse" = "A2 49 4D F3 D9 1E 9F 88 01 01 08 6A 00 03 E9 03"

[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"
"RecordModifiedMax" = "DBmcPcMQWFhgY rGYk4QzHBeF2fxbre7VIIUcoKG7DXliQpuWQPp6tr2lCnhY0ZDPg=="

[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"ComputerName" = "XP6"

"UserName" = "%CurrentUserName%"

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "80 D8 7F 71 AD 09 0C 16 81 F7 CA D0 70 CB 18 A9"

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

[HKLM\SOFTWARE\Microsoft\Direct3D\MostRecentApplication]
"Name" = "temp2279324397.exe"

[HKCU\Software\Microsoft\Notepad]
"activeModifiedTheme" = "24 80 F9 7F 87 48 7F 4D 60 4D 24 7E 64 71 50 1B"

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

[HKCU\Software\Sysinternals\Process Monitor]
"DefaultCompressedRecord" = "24 80 F9 7F 73 9C 24 6E 63 05 7A C5 7D E4 61 17"

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]
"NetworkChecker" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\temp2279324397.exe"

The process %original file name%.exe:1096 makes changes in the system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "72 59 34 6F C5 5D 44 73 86 79 8C 87 8C 6D FA D8"

[HKLM\SOFTWARE\Microsoft\Direct3D\MostRecentApplication]
"Name" = "%original file name%.exe"

Network activity (URLs)

URL	IP
hxxp://123.240.9.110/mod2/tayran1.exe (Malicious)
hxxp://126.117.193.122/mod1/tayran1.exe (ET POLICY PE EXE or DLL Windows file download , Malicious)

HOSTS file anomalies

No changes have been detected.

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):

   dwwin.exe:360
   %original file name%.exe:1096

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\A60AD.dmp (50612 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\5a33_appcompat.txt (1943 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\temp3303302130.exe (3914 bytes)
   %Documents and Settings%\%current user%\Local Settings\Temp\temp2279324397.exe (3914 bytes)

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

   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "NetworkChecker" = "C:\DOCUME~1\"%CurrentUserName%"\LOCALS~1\Temp\temp2279324397.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