BKDR_POISON.BUM
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
TECHNICAL DETAILS
98,304 bytes
EXE
Yes
02 Sep 2013
Arrival Details
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This backdoor drops the following copies of itself into the affected system:
- %Windows%\mschitshell.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications
HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
PJM
HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
PJM\Recent File List
HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
PJM\Settings
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{random}
StubPath = "%Windows%\mschitshell.exe"
Other Details
This backdoor connects to the following possibly malicious URL:
- {BLOCKED}e.{BLOCKED}view.com
SOLUTION
9.300
10.256.05
03 Sep 2013
10.257.00
04 Sep 2013
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
Restart in Safe Mode
Step 3
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software
- Local AppWizard-Generated Applications
- Local AppWizard-Generated Applications
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- {random}
- {random}
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_POISON.BUM. 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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