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Published Nov 06, 2016
|
Updated Sep 15, 2017
TrojanDropper:Win32/Randrew.A!bit
What to do now
Use the following free Microsoft software to detect and remove this threat:
You should also run a full scan. A full scan might find hidden malware.
Use cloud protection
Use cloud protection to help guard against the latest malware threats. It’s turned on by default for Microsoft Security Essentials and Windows Defender for Windows 10.
Go to All settings > Update & security > Windows Defender and make sure that your Cloud-based Protection settings is turned On .
Get more help
You can also see our advanced troubleshooting page for more help or search the Microsoft virus and malware community for more help.
If you’re using Windows XP , see our Windows XP end of support page .
Technical information
Threat behavior
Installation
This threat can create files on your PC, including:
It modifies the registry so that it runs each time you start your PC. For example:
In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "
ebgatees "
With data: "
%APPDATA% \ brigteton\gebnw.exe "
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "
ebgatees "
With data: "
%APPDATA% \ brigteton\gebnw.exe "
The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.
Payload
Installs malware or unwanted software
This trojan can install other malware or unwanted software onto your PC.
Connects to a remote host
We have seen this threat connect to a remote host, including:
lumyyyy.hopto.org using port 53
Malware can connect to a remote host to do any of the following:
Check for an Internet connection
Download and run files (including updates or other malware)
Report a new infection to its author
Receive configuration or other data
Receive instructions from a malicious hacker
Search for your PC location
Upload information taken from your PC
Validate a digital certificate
Additional information
Creates a mutex
This threat can create one or more mutexes on your PC. For example:
31c2462bcc268ed9fa78cd425e6d5fa3f7438780
eed3bd3a-a1ad-4e99-987b-d7cb3fcfa7f0 - S-1-5-21-3383749062-2246846829-375697490-500
It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.
This malware description was published using automated analysis of file SHA1 18457481ae720866945a17e73431ab6f3cc500b4 .
Prevention
Symptoms
The following can indicate that you have this threat on your PC:
You see a file similar to:
You see registry modifications such as:
In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run Sets value: "ebgatees " With data: "%APPDATA% \ brigteton\gebnw.exe "
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run Sets value: "ebgatees " With data: "%APPDATA% \ brigteton\gebnw.exe "
You see the following mutex:
31c2462bcc268ed9fa78cd425e6d5fa3f7438780
eed3bd3a-a1ad-4e99-987b-d7cb3fcfa7f0 - S-1-5-21-3383749062-2246846829-375697490-500
Debug Version = 1.0.0.0;