Trojan-Dropper:W32/Ambler.D, Trojan-Dropper:W32/Ambler.D, Trojan-Dropper.Win32.Agent.absn, TrojanDropper:Win32/Ambler.A (Microsoft)


This type of trojan contains one or more malicious programs, which it will secretly install and execute.


Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

This malware drops a malicious file that steals credentials from Internet banking websites.


The following component is injected into the iexplorer.exe process:

  • %windir%\system32\svchstb.dll

The injected code is registered as an Internet Explorer Browser Helper Object (BHO). This injected code is the main component file that allows the malware to steal passwords from Internet Explorer's auto-complete passwords cache.The malware also attempts to connect to a remote server and download files:


File System Changes

Creates these files:

  • %windir%\system32\edl.dat
  • %windir%\system32\svchstb.dll
  • %windir%\system32\bb1.dat
  • %windir%\system32\rc.dat
  • %windir%\system32\ps1.dat
  • %windir%\system32\alog.txt

Modified these files:

  • %windir%\system32\alog.txt

Registry Modifications

Sets these values:

  • [HKLM\Software\MRSoft] LN = X]HCX_IOGG
  • [HKLM\Software\MRSoft] CODIGO = lVUVST' T:...':#'"v:VV%#:%T%'.U"'VR .j
  • [HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}] @ = Rmn plugin
  • [HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}\TypeLib] @ = {0017825A-A697-488f-84AA-b7CEE2A02333}
  • [HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}\ProgID] @ = RITLAB.1
  • [HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}\InprocServer32] @ = svchstb.dll
  • [HKLM\Software\MRSoft\P] N = [random_number]
  • [HKCU\Software\Microsoft\Internet Explorer\Main] Enable Browser Extensions = yes

Creates these keys:

  • HKLM\Software\MRSoft
  • HKLM\Software\MRSoft\P
  • HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}
  • HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}\InprocServer32
  • HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}\ProgID
  • HKLM\Software\Classes\CLSID\{ABADC07C-9990-405a-AA24-2C209B50AE79}\TypeLib
  • HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{ABADC07C-9990-405a-AA24-2C209B50AE79}
  • HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\{ABADC07C-9990-405A-AA24-2C209B50AE79}
  • HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\{ABADC07C-9990-405A-AA24-2C209B50AE79}\iexplore

Date Created: -

Date Last Modified: -