RANSOM_CRYPWALL.AGS

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It modifies the Internet Explorer Zone Settings.

It deletes the initially executed copy of itself.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

• %Application Data%\{random characters}\{random characters}.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

• %User Startup%\HELP_YOUR_FILES.TXT
• %User Startup%\HELP_YOUR_FILES.PNG
• %User Startup%\HELP_YOUR_FILES.HTML

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

It drops and executes the following files:

• %Desktop%\HELP_YOUR_FILES.TXT
• %Desktop%\HELP_YOUR_FILES.PNG
• %Desktop%\HELP_YOUR_FILES.HTML

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = "%Application Data%\{random characters}\{random characters}.exe"

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "1"

(Note: The default value data of the said registry entry is 0.)

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Other Details

This Trojan connects to the following possibly malicious URL:

• {BLOCKED}en-handbags.com/X1rZYp.php?{random letter}={random values}
• {BLOCKED}rpaintbody.com/lrQ2bG.php?{random letter}={random values}
• {BLOCKED}mission.org/VImTSM.php?{random letter}={random values}
• {BLOCKED}sun.eu/4BKEt7.php?{random letter}={random values}
• {BLOCKED}.pl/WBxm6M.php?{random letter}={random values}
• {BLOCKED}anykaprun.cz/LV6Egb.php?{random letter}={random values}
• {BLOCKED}pl/93_7ja.php?{random letter}={random values}
• {BLOCKED}a-meble.pl/Q0bAHK.php?{random letter}={random values}
• {BLOCKED}.ca/IlDH1J.php?{random letter}={random values}
• {BLOCKED}iomariocervo.it/3lV_m5.php?{random letter}={random values}
• {BLOCKED}ay.sk/mE8MKJ.php?{random letter}={random values}
• {BLOCKED}fullofcarrots.ch/OIP7rk.php?{random letter}={random values}
• {BLOCKED}om.au/rxo5Zp.php?{random letter}={random values}
• {BLOCKED}s-krombach.de/F74yDk.php?{random letter}={random values}
• {BLOCKED}us-iffland.com/1G7MQi.php?{random letter}={random values}
• {BLOCKED}.com/mshUtH.php?{random letter}={random values}
• {BLOCKED}kdental.com/GMu28q.php?{random letter}={random values}
• {BLOCKED}consulting.com/1r432c.php?{random letter}={random values}
• {BLOCKED}ugema.com/fgr5nw.php?{random letter}={random values}
• {BLOCKED}derappeschoenlapper.nl/RA4BLM.php?{random letter}={random values}
• {BLOCKED}ijwegerif.nl/52Qwds.php?{random letter}={random values}
• {BLOCKED}preescolar.com/_bfSj7.php?{random letter}={random values}
• {BLOCKED}ballvideobwsl.net/jN3vUi.php?{random letter}={random values}
• {BLOCKED}andblings.com/RWH6sC.php?{random letter}={random values}
• {BLOCKED}.kz/Ov8_qV.php?{random letter}={random values}
• {BLOCKED}intoys.az/v6a8Ls.php?{random letter}={random values}
• {BLOCKED}seltimes.com/5X1Wb3.php?{random letter}={random values}
• {BLOCKED}iogene-atmosphere.com/ixcnYt.php?{random letter}={random values}
• {BLOCKED}mode.nl/DaZjW7.php?{random letter}={random values}
• {BLOCKED}ngandentering-movie.com/rXUaE8.php?{random letter}={random values}
• {BLOCKED}bookkeeping.co.uk/WnsB6l.php?{random letter}={random values}
• {BLOCKED}.com/VWuyK4.php?{random letter}={random values}
• {BLOCKED}.com/_AcyQv.php?{random letter}={random values}
• {BLOCKED}eing.com/G5JmvW.php?{random letter}={random values}
• {BLOCKED}to90210.altervista.org/bJT1VS.php?{random letter}={random values}
• {BLOCKED}al-club-boeckels.de/kiCsmO.php?{random letter}={random values}
• {BLOCKED}kazamkowa.pl/WGr_xJ.php?{random letter}={random values}
• {BLOCKED}tive.ml/0FeLA2.php?{random letter}={random values}
• {BLOCKED}urquest.com/nCHOvM.php?{random letter}={random values}

It does the following:

• Capable of encrypting files on the affected system
• Drops HELP_YOUR_FILES.PNG to all folders where the files are encrypted

It deletes the initially executed copy of itself