BKDR_BIFROSE.WINN
Backdoor.Win32.Bifrose.fpi (Kaspersky), Backdoor:Win32/Bifrose.gen!E (Microsoft)
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 deletes the initially executed copy of itself.
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 a copy of itself in the following folders using different file names:
- %User Profile%\Local Settings\wminsts.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It adds the following processes:
- iexplorer.exe
Other System Modifications
This backdoor adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{UID}
HKEY_LOCAL_MACHINE\SOFTWARE\SKav
HKEY_CURRENT_USER\Software\SKav
It adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{UID}
stubpath = "%User Profile%\Local Settings\wminsts.exe s"
HKEY_LOCAL_MACHINE\SOFTWARE\SKav
nck = "{hex values}"
HKEY_CURRENT_USER\Software\SKav
klg = "00"
Other Details
This backdoor connects to the following possibly malicious URL:
- securitybbs.{BLOCKED}s.info
- release2002.{BLOCKED}ame.org
It deletes the initially executed copy of itself