Backdoor.MSIL.REMCOS.ANS
HEUR:Trojan-Dropper.MSIL.Scrop.gen (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
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.
TECHNICAL DETAILS
1,245,184 bytes
ISO
02 Sep 2019
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:
- %Application Data%\Boot\dxdiag.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It creates the following folders:
- %Application Data%\Logs
- %Application Data%\Boot
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Autostart Technique
This Backdoor drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\ap2tECng.url
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Other System Modifications
This Backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Newpeople-XAURAL
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Newpeople-XAURAL
exepath = "{random characters}"
HKEY_CURRENT_USER\Software\Newpeople-XAURAL
licence = "0FD660964BEBCF03EE1AEC625EBDD980"
Dropping Routine
This Backdoor drops the following files:
- %Application Data%\Boot\By9D0A7g.vbs
- %System Root%\BVTBin\Tests\installpackage\csilogfile.log
- %Application Data%\Logs\loggs.dat
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other Details
This Backdoor connects to the following possibly malicious URL:
- http://rownip.{BLOCKED}s.net
- http://rownip.{BLOCKED}ties.com
SOLUTION
9.850
15.342.04
03 Sep 2019
15.343.00
04 Sep 2019
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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_CURRENT_USER\Software\Newpeople-XAURAL
- exepath = {random characters}
- In HKEY_CURRENT_USER\Software\Newpeople-XAURAL
- licence = 0FD660964BEBCF03EE1AEC625EBDD980
Step 5
Search and delete these components
- %Application Data%\Boot\By9D0A7g.vbs
- %System Root%\BVTBin\Tests\installpackage\csilogfile.log
- %Application Data%\Logs\loggs.dat
Step 6
Search and delete these folders
- %Application Data%\Logs
- %Application Data%\Boot
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.MSIL.REMCOS.ANS. 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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