WORM_CONUSTR.AK
W32/Worm-FUY!725979AE4F71 (McAfee); W32/Conustr-A (Sophos AV);
Windows
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
139,264 bytes
EXE
02 Aug 2014
Arrival Details
This Worm 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 Worm drops the following copies of itself into the affected system:
- %User Temp%\conhost.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 creates the following folders:
- %User Temp%\WPDNSE
- {Removable Drive Letter}:\RECYCLER
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)
Other System Modifications
This Worm adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
exefile
NeverShowExt = " "
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Temp%\conhost.exe"
Propagation
This Worm drops the following copies of itself in all physical and removable drives:
- {Removable Drive Letter}:\RECYCLER\Dcfly.exe
- {Removable Drive Letter}:\{Folder Name}.exe
Dropping Routine
This Worm drops the following files:
- {Removable Drive Letter}:\RECYCLER\{random filename}.NLS
- %User Temp%\WPDNSE\{random filename}.NLS
- %User Temp%\ppxxxx
- %User Temp%\winword4.doc
- %User Temp%\must.bat
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)