Backdoor.Win32.Kelihos_dbd2f07a60

Dynamic Analysis

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

dbd2f07a60392d2d3ed68c368212ecd4.exe:1792

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

temp63.exe:1040

File activity

The process dbd2f07a60392d2d3ed68c368212ecd4.exe:1792 makes changes in a file system.

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

%WinDir%\Temp\temp63.exe (6407 bytes)

The process temp63.exe:1040 makes changes in a file system.

The Backdoor deletes the following file(s):

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

Registry activity

The process dbd2f07a60392d2d3ed68c368212ecd4.exe:1792 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "8A 41 60 35 91 9B 7A 42 57 2A C5 2E B7 57 8C 1F"

The process temp63.exe:1040 makes changes in a system registry.

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

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "78 07 83 95 31 85 3C 11 0A 62 05 E9 16 7D 34 32"

[HKCU\Software\Microsoft\Notepad]
"sizeCompletedValid" = "DHglXAk0FP7 zBsLPnMqgLpA0Vh0QYNgzDTIztrJbrnFYBlg9F56Dkak8RumGB9qow=="

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

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

[HKLM\System\CurrentControlSet\Services\nm\Parameters]
"ComputerName" = "XP9"

[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 3F BA 73 A5 39 CE 22 25 D9 24 6D"

[HKCU\Software\Sysinternals\Process Monitor]
"DefaultCompressedRecord" = "E9 80 F9 7F 73 7F 53 9B 3A B4 BF 13 A8 71 62 9D"

[HKCU\Software\Microsoft\Notepad]
"activeModifiedTheme" = "E9 80 F9 7F 87 A0 C2 60 53 50 2E 02 89 0E 8A 3F"

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

[HKCU\Software\Sysinternals\Process Monitor]
"RecordModifiedMax" = "DHglXAk0FP7 zBsLPnMqgLpA0Vh0QYNgzDTIztrJbrnFYBlg9F56Dkak8RumGB9qow=="

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

[HKCU\Software\Microsoft\Internet Explorer\Main]
"LineLoadedQuick" = "DHglXAk0FP7 zBsLPnMqgLpA0Vh0QYNgzDTIztrJbrnFYBlg9F56Dkak8RumGB9qow=="

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\temp63.exe"

Network activity (URLs)

URL	IP
hxxp://ditojtap.ru/moon004.exe (Malicious)
hxxp://116.83.30.109/login.htm
hxxp://116.83.30.109/main.htm
hxxp://54.228.197.200/

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):

   dbd2f07a60392d2d3ed68c368212ecd4.exe:1792
   

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

   %WinDir%\Temp\temp63.exe (6407 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\temp63.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