BKDR_FLAWEDAMMYY.D
Trojan:Win32/Ammyrat.A (MICROSOFT), Trojan.Win32.Ammyrat (IKARUS)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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. However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
669,472 bytes
EXE
Yes
17 Jul 2018
Compromises system security, Steals information
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 terminates itself if it finds the following processes in the affected system's memory:
- BULLGUARDTRAY.EXE
- CIS.EXE
- CMDAGENT.EXE
- DWARKDAEMON.EXE
- DWENGINE.EXE
- QHACTIVEDEFENSE.EXE
- QHSAFETRAY.EXE
- QHWATCHDOG.EXE
- SPIDERAGENT.EXE
- V3LITE.EXE
- V3MAIN.EXE
- V3SP.EXE
Other System Modifications
This Backdoor adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services
netsxuid = {victim id (8 random digits)}
Backdoor Routine
This Backdoor executes the following commands from a remote malicious user:
- File Manager
- View Screen
- Remote Control
- Audio Chat
- RDP Sessions
- Service - Install/Start/Stop/Remove
- Disable desktop background
- Disable desktop composition
- Disable visual effects
- Show tooltip - mouse cursor blinking cause
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}.{BLOCKED}.132.119
However, as of this writing, the said sites are inaccessible.
Information Theft
This Backdoor gathers the following data:
- Victim ID
- OS
- Privilege
- Username
- Computer name
- Antivirus product name obtained via WMI query
- 1 if a usable smart-card is inserted into a reader, 0 otherwise
- Malware build time
Other Details
This Backdoor accepts the following parameters:
- -service
SOLUTION
9.850
14.404.04
26 Jul 2018
14.405.00
27 Jul 2018
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 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_LOCAL_MACHINE\SYSTEM\ControlSet001\services
- netsxuid = {victim id (8 random digits)}
- netsxuid = {victim id (8 random digits)}
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_FLAWEDAMMYY.D. 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.
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_FLAWEDAMMYY.D. 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 the following Trend Micro Support pages for more information:
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