Backdoor.Win32.Kelihos_d5d04d36f3

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

d5d04d36f396c1717f8f3fda030008fa.exe:516

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

temp33.exe:1756

File activity

The process temp33.exe:1756 makes changes in a file system.

The Backdoor deletes the following file(s):

%WinDir%\Temp\tmp.exe (0 bytes)

The process d5d04d36f396c1717f8f3fda030008fa.exe:516 makes changes in a file system.

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

%WinDir%\Temp\temp33.exe (7386 bytes)

Registry activity

The process temp33.exe:1756 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "DA CE DE FE 7E 3F 86 4A B9 3C 59 CF 80 C8 0D D4"

[HKCU\Software\Microsoft\Notepad]
"sizeCompletedValid" = "DAn5xMmp1u6 H9l8kaaItj/Rvf47i7rzJD44l4U//0QhwpCjvYnbedHLFxn/uyFvEA=="

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

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

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

[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" = "E9 80 F9 7F 7A B9 74 F5 18 16 59 7D 7E C0 C4 30"

[HKCU\Software\Sysinternals\Process Monitor]
"DefaultCompressedRecord" = "E9 80 F9 7F 73 BA 89 75 5A D4 A2 53 6D B7 A3 38"

[HKCU\Software\Microsoft\Notepad]
"activeModifiedTheme" = "E9 80 F9 7F 87 E3 FD 05 74 8F E1 94 7B 2B AD 09"

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

[HKCU\Software\Sysinternals\Process Monitor]
"RecordModifiedMax" = "DAn5xMmp1u6 H9l8kaaItj/Rvf47i7rzJD44l4U//0QhwpCjvYnbedHLFxn/uyFvEA=="

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

[HKCU\Software\Microsoft\Internet Explorer\Main]
"LineLoadedQuick" = "DAn5xMmp1u6 H9l8kaaItj/Rvf47i7rzJD44l4U//0QhwpCjvYnbedHLFxn/uyFvEA=="

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]
"NetworkSaver" = "%WinDir%\Temp\temp33.exe"

The process d5d04d36f396c1717f8f3fda030008fa.exe:516 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "3D 0A B2 DD AD 5E 78 BE 9C 7F 0F 31 4F BF 76 5B"

Network activity (URLs)

URL	IP
hxxp://178.172.224.9/welcome.htm
hxxp://178.172.224.9/index.htm
hxxp://54.247.125.32/EVGFYF

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):

   d5d04d36f396c1717f8f3fda030008fa.exe:516

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

   %WinDir%\Temp\temp33.exe (7386 bytes)

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

   [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   "NetworkSaver" = "%WinDir%\Temp\temp33.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