PHP_PBOT.MS
Backdoor:PHP/Hiebot.E (Microsoft); PHP/IRCBOT.FP (AntiVir); Backdoor.PHP.Pbot.A (BitDefender); PHP/Pbot.B!tr (Fortinet); Backdoor.PHP.Pbot (Ikarus)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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 may be hosted on a website and run when a user accesses the said website.
It requires its main component to successfully perform its intended routine. This is the Trend Micro detection for files that exhibit certain behaviors. However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
22,095 bytes
Script
No
24 Oct 2014
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.
It may be hosted on a website and run when a user accesses the said website.
Download Routine
This backdoor saves the files it downloads using the following names:
- {malware path}/var/tmp/lol.txt
- {malware path}/tmp/lol.txt
- {malware path}/tmp.txt
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}a.com//ams/ambroll/lol.txt
It requires its main component to successfully perform its intended routine.
This is the Trend Micro detection for:
- PHP scripts in compromised Web servers that wait for a connection from a remote host. Backdoor commands are passed as parameters to HTTP requests.
However, as of this writing, the said sites are inaccessible.
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
Close all opened browser windows
Step 4
Search and delete these files
- {malware path}/var/tmp/lol.txt
- {malware path}/tmp/lol.txt
- {malware path}/tmp.txt
Step 5
Scan your computer with your Trend Micro product to delete files detected as PHP_PBOT.MS. 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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