BKDR_INVADER.B
W32/Invader.U!tr (Fortinet); HEUR:Trojan.Win32.Invader (Kaspersky); Trojan.Invader! (Agnitum)
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 executes commands from a remote malicious user, effectively compromising the affected system.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
254,464 bytes
EXE
Yes
16 Apr 2015
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 and executes them:
- %Program Files%\Windows NT\Accessories\nt\GoogleUpdate.exe (If affected user is administrator)
- %User Profile%\Applications\GoogleUpdate.exe (Otherwise)
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %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.)
Autostart Technique
This backdoor registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SENSS
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download and execute files
- Capture screenshots
- Log mouse and keyboard actions
- Update itself
- Open a remote shell
- Terminate processes
- Enumerate network shares
- Enumerate drives
- Uninstall itself
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- bbs.{BLOCKED}es.com:80
- img.{BLOCKED}lves.com:8080
- domain.{BLOCKED}es.com:443
Other Details
This backdoor deletes the initially executed copy of itself
SOLUTION
9.750
11.710.06
16 Apr 2015
11.711.00
17 Apr 2015
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
Restart in Safe Mode
Step 4
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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SENSS
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_INVADER.B. 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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