BKDR_SPAMMY.WCF
Spammer:Win32/Sality.A (MICROSOFT), a variant of Win32/SpamTool.Agent.NET trojan (NOD32)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk. It connects to a website to send and receive information.
TECHNICAL DETAILS
49,834 bytes
EXE
Yes
22 Jul 2014
Connects to URLs/IPs
Arrival Details
This backdoor 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 backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:
- sobakavolos33919
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\{Key based on username}
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name:*:Enabled:ipsec}"
Backdoor Routine
This backdoor executes the following command(s) from a remote malicious user:
- Spam email
- Download and execute arbitrary file
It connects to the following websites to send and receive information:
- {BLOCKED}.{BLOCKED}.142.216:3143
As of this writing, the said servers are currently inaccessible.
NOTES:
It gathers email addresses from the Windows Address Book (WAB) as part of its backdoor routine.
It downloads from the following sites as part of its backdoor routine:
- http://{BLOCKED}.{BLOCKED}.101.202/pstats/gg2.php
- http://{BLOCKED}.{BLOCKED}.71.71/images2.php
SOLUTION
9.700
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
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
- {Generated Key based on username}
- {Generated Key based on username}
Step 4
Delete this registry value
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_LOCAL_MACHINE\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path and file name} = "{malware path and file name:*:Enabled:ipsec}"
- {malware path and file name} = "{malware path and file name:*:Enabled:ipsec}"
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_SPAMMY.WCF. 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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