BKDR_CAPHAW.AM
Gen:Variant.Graftor.15280 [FSecure]; Backdoor.Win32.Caphaw [Ikarus]; Trojan-Dropper.Win32.Injector.cruw [Kaspersky]; Backdoor:Win32/Caphaw.A [Microsoft];
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
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 connects to a website to send and receive information.
TECHNICAL DETAILS
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:
- {random}_MASTER
It injects itself into the following processes as part of its memory residency routine:
- maxthon.exe
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random CLSID} = %Application Data%\{random folder found}\{filename found in %System%}
Backdoor Routine
This backdoor connects to the following websites to send and receive information:
- {BLOCKED}ings.cc
- {BLOCKED}protect.cc
NOTES:
It drops a copy of itself in random folders or subfolders found in the %Application Data% folder. It uses the file name of a file found in the %System% folder. (eg: %Application Data%\Microsoft\fontview.exe)
Backdoor routines
- Download or upload files
- Monitor keystrokes and steal information
- Modify system settings
- Terminate process
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Delete the registry entry with an unknown data 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random CLSID} = %Application Data%\{random folder found}\{filename found in %System%}
- {random CLSID} = %Application Data%\{random folder found}\{filename found in %System%}
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_CAPHAW.AM. 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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