WORM_CONUS.B
Worm:Win32/Conustr.A (Microsoft); RDN/Generic.dx!dd3 (McAfee); Trojan.Win32.Vague.bn (Kaspersky); Troj/Zusy-W (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic36.AFEJ (AVG)
Windows
![](/vinfo/imgFiles/legend.jpg)
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
No
12 Jul 2015
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 creates the following folders:
- %User Temp%\WPDNSE
(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 modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"
(Note: The default value data of the said registry entry is 3a98.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Temp%\conhost.exe"
Dropping Routine
This worm drops the following files:
- %User Temp%\ppxxxx
- %User Temp%\~tmpx5.tmp
- %User Temp%\conhost.exe
- %User Temp%\winword4.doc
(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.)
This report is generated via an automated analysis system.
SOLUTION
9.750
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
To: TrapPollTimeMilliSecs = ""3a98""
- From: TrapPollTimeMilliSecs = "3a98"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- Load = "%User Temp%\conhost.exe"
Step 3
Search and delete these components
- %User Temp%\ppxxxx
- %User Temp%\~tmpx5.tmp
- %User Temp%\conhost.exe
- %User Temp%\winword4.doc
Step 4
Search and delete this folder
- %User Temp%\WPDNSE
Step 5
Scan your computer with your Trend Micro product to delete files detected as WORM_CONUS.B. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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