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Alex NightWatcher: Solved! (5 / 5)

Downloader.NSIS.a also known as OutBrowse (fs), a variant of Win32/OutBrowse.D potentially unwanted, PUA/Outbrowse.Gen.

Malware Analysis of Downloader.NSIS.a – BUTTERFLYSCR.EXE

Created files:

%WINDIR%\TEMP\CR_472CB.TMP\SETUP.EXE
%WINDIR%\TEMP\CR_472CB.TMP\SETUP_PATCH.PACKED.7Z
%WINDIR%\BUTTERFLYSCR.EXE
%WINDIR%\SPRING\1.JPG
%WINDIR%\SPRING\10.JPG

Autostart registry keys:

HKLM\SOFTWARE\CLASSES\CLSID\{D3388703-5092-487C-8217-11ADA1CA68B5}\LOCALSERVER32\: “”%TEMP%\DOWNLOADMANAGER.EXE””
HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\{521ED2FA-5A27-242A-A349-901E43D6CC31}\UninstallString: “”%Program Files%\InstallShield Installation Information\{521ED2FA-5A27-242A-A349-901E43D6CC31}\setup.exe” -runfromtemp -l0x0009 -removeonly”
HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\{521ED2FA-5A27-242A-A349-901E43D6CC31}\DisplayName: “Free Spring Screensaver”

Detected by UnHackMe:

BUTTERFLYSCR.EXE
Default location: %WinDir%\BUTTERFLYSCR.EXE

Dropper hash(md5): 596c2ef53d812d94bbdda2661a944651

Written by NightWatcher

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