BKDR_HUPIGON.FOU
Backdoor:Win32/Hupigon.WN (Microsoft); BackDoor-AWQ.b (McAfee); Backdoor.Graybird!Gen (Symantec); Backdoor.Win32.Hupigon.exa, Backdoor.Win32.Hupigon.abcu, Backdoor.Win32.Hupigon.abcu, Backdoor.Win32 (Kaspersky); BehavesLike.Win32.Malware.bsf (vs) (Sunbelt); Backdoor.Graybird.CCF (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
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 drops the following copies of itself into the affected system:
- %Program Files%\Common Files\Microsoft Shared\MSINFO\rejoice51.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
Dropping Routine
This backdoor drops the following files:
- %Program Files%\Common Files\Microsoft Shared\MSINFO\paramstr.txt
- %System%\_rejoice51.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}.64.6:8181/mars.txt
This report is generated via an automated analysis system.
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
Search and delete these files
- %Program Files%\Common Files\Microsoft Shared\MSINFO\paramstr.txt
- %System%\_rejoice51.exe
Step 3
Scan your computer with your Trend Micro product to delete files detected as BKDR_HUPIGON.FOU. 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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