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Backdoor:Win32/Mosucker.AA

First posted on 15 February 2019.
Source: Microsoft

Aliases :

Backdoor:Win32/Mosucker.AA is also known as BackDoor-EE!a, BKDR_MOSUCKER.AL, Backdoor.Win32.MoSucker.30.az.

Explanation :

Backdoor:Win32/Mosucker.AA allows unauthorized access and control of an affected computer. Installation When executed, Backdoor:Win32/Mosucker.AA copies itself to updater.exe.
Note: refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:WinntSystem32; and for XP, Vista, and 7 is C:WindowsSystem32.
The malware modifies the following registry entries to ensure that its copy executes at each Windows start:

Adds value: "Windows Update"
With data: "c:windowssystem32updater.exe"
To subkey: HKCUSoftwareMicrosoftwindowscurrentversion
un
The malware creates the following files on an affected computer:
mswinsck.ocx
The malware registers the file mswinsck.ocx, using the Windows utility regsvr32.exe with the /s parameter. Regsvr32.exe is a program that is used to register or unregister a COM (Component Object Model) DLL (dynamic link library). The /s parameter allows regsvr32 to run silently without displaying any messages. This action may result in the following registry modifications:

Adds value:"(default)"
With data: "microsoft winsock control, version 6.0"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}
Adds value:"(default)"
With data: "c:windowssystem32mswinsck.ocx"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}InprocServer32
Adds value:"(default)"
With data: "{248dd896-bb45-11cf-9abc-0080c7e7b78d}"
To subkey: HKLMSOFTWAREClassesMSWinsock.WinsockCLSID
Adds value:"(default)"
With data: "{248dd896-bb45-11cf-9abc-0080c7e7b78d}"
To subkey: HKLMSOFTWAREClassesMSWinsock.Winsock.1CLSID
Adds value:"(default)"
With data: "mswinsock.winsock"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}VersionIndependentProgID
Adds value:"(default)"
With data: "mswinsock.winsock.1"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}ProgID
Adds value:"(default)"
With data: "{248dd890-bb45-11cf-9abc-0080c7e7b78d}"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}TypeLib
Adds value:"(default)"
With data: "1.0"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}Version
Adds value:"(default)"
With data: "0"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}MiscStatus
Adds value:"(default)"
With data: "132497"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}MiscStatus1
Adds value:"(default)"
With data: "c:windowssystem32mswinsck.ocx, 1"
To subkey: HKLMSOFTWAREClassesCLSID{248DD896-BB45-11CF-9ABC-0080C7E7B78D}ToolboxBitmap32 Payload Allows backdoor access and control Backdoor:Win32/Mosucker.AA allows unauthorized access and control of an affected computer. An attacker can perform any number of different actions on an affected computer using Backdoor:Win32/Mosucker.AA. This could include, but is not limited to, the following actions:
Download and execute arbitrary files Upload files Spread to other computers using various methods of propagation Log keystrokes or steal sensitive data Modify system settings Run or terminate applications Delete files
This malware description was produced and published using our automated analysis system's examination of file SHA1 d379b0607f741f0138a9d628b5148514654f3643.

Last update 15 February 2019

 

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