Backdoor.Win32.Kelihos_d90df0da5c

by malwarelabrobot on August 28th, 2013 in Malware Descriptions.

Backdoor.Win32.Kelihos.FD, (Lavasoft MAS)
Behaviour: Backdoor


The description has been automatically generated by Lavasoft Malware Analysis System and it may contain incomplete or inaccurate information.

Summary
Technical Details
Removal Recommendations

MD5: d90df0da5c1c512fd375df3ebe017c52
SHA1: 735ba41234e6f17e64c73c99710a7468eff360f1
SHA256: 533ab4d598ffd87636a0348d808a6e04fe1f6addc116ae506928535e239d69e1
SSDeep: 24576:J oeYiXobL7xz8eYrP6ZHYVNaGBCQyvZ ow9/YAiKU7vsXgq2:AoBbL7xzRmCZSoACrNK2KSUF2
Size: 1138309 bytes
File type: EXE
Platform: WIN32
Entropy: Packed
PEID:
Company: no certificate found
Created at: 2005-05-01 17:11:13


Summary:

Backdoor. Malware that enables a remote control of victim's machine.

Payload

No specific payload has been found.

Process activity

The Backdoor creates the following process(es):

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

d90df0da5c1c512fd375df3ebe017c52.exe:1940

File activity

The process d90df0da5c1c512fd375df3ebe017c52.exe:1940 makes changes in a file system.
The Backdoor deletes the following file(s):

C:\tmp.exe (0 bytes)

Registry activity

The process d90df0da5c1c512fd375df3ebe017c52.exe:1940 makes changes in a system registry.
The Backdoor creates and/or sets the following values in system registry:

[HKLM\SOFTWARE\Microsoft\Cryptography\RNG]
"Seed" = "45 60 C5 91 94 C9 E1 2C 5C 86 D7 10 58 89 36 AF"

[HKCU\Software\Microsoft\Notepad]
"sizeCompletedValid" = "DPhL6rOutghGGRlV1dq d0XYcGjiunf3hHQ5 Gj5faRfJv3OEmXDTSICfJZaQyvipg=="

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"RecordModifiedMax" = "DPhL6rOutghGGRlV1dq d0XYcGjiunf3hHQ5 Gj5faRfJv3OEmXDTSICfJZaQyvipg=="

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"UrlEnabledUse" = "80"

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"FlagsModifiedValid" = "00 00 00 00 00 00 00 00"

[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\System\CurrentControlSet\Services\nm\Parameters]
"ComputerName" = "MAS1"

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

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

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

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

[HKCU\Software\Microsoft\Internet Explorer\Main]
"PersistentLocalizedName" = "0F 80 F9 7F 7A B2 BD 0D A3 38 47 06 38 F0 4F F4"

[HKCU\Software\Microsoft\Internet Explorer\Main]
"LineLoadedQuick" = "DPhL6rOutghGGRlV1dq d0XYcGjiunf3hHQ5 Gj5faRfJv3OEmXDTSICfJZaQyvipg=="

[HKCU\Software\Microsoft\Notepad]
"activeModifiedTheme" = "0F 80 F9 7F 87 BB 00 BC E0 34 C6 AA 51 C3 8C 97"

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
"DefaultCompressedRecord" = "0F 80 F9 7F 73 34 3E B9 C1 DE FB CE 5C F6 AA E8"

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]
"NetworkVerifyer" = "c:\d90df0da5c1c512fd375df3ebe017c52.exe"

Network activity (URLs)

URL IP
hxxp://109.227.91.72/index.htm (Malicious)
hxxp://109.227.91.72/start.htm (Malicious)
hxxp://54.247.125.32/OFEBIB
hxxp://103.31.186.89/OFEBIB


Rootkit activity

No anomalies have been detected.

Propagation


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 the original Backdoor's process (How to End a Process With the Task Manager).
  2. Delete the original Backdoor file.
  3. Delete the following value(s) in the autorun key (How to Work with System Registry):

    [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
    "NetworkVerifyer" = "c:\d90df0da5c1c512fd375df3ebe017c52.exe"

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

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