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Trojan.DownLoader46.25979
Added to the Dr.Web virus database:
2023-10-24
Virus description added:
2024-03-29
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'SysHelper' = '"%LOCALAPPDATA%\78ce57ff-4713-4a19-844d-fa756e2129b7\49FA.exe" --AutoStart'
Creates or modifies the following files
<SYSTEM32>\tasks\firefox default browser agent 1f24aa65a9795ced
<SYSTEM32>\tasks\time trigger task
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion:
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' Add-MpPreference -ExclusionPath @($env:UserProfile, $env:ProgramFiles) -Force
Executes the following
'<SYSTEM32>\netsh.exe' advfirewall firewall add rule name="csrss" dir=in action=allow program="%WINDIR%\rss\csrss.exe" enable=yes
Injects code into
the following system processes:
%WINDIR%\microsoft.net\framework\v4.0.30319\applaunch.exe
Searches for windows to
detect analytical utilities:
ClassName: 'OLLYDBG', WindowName: ''
ClassName: 'GBDYLLO', WindowName: ''
ClassName: 'pediy06', WindowName: ''
ClassName: 'RegmonClass', WindowName: ''
ClassName: 'FilemonClass', WindowName: ''
ClassName: '', WindowName: 'File Monitor - Sysinternals: www.sysinternals.com'
ClassName: 'PROCMON_WINDOW_CLASS', WindowName: ''
ClassName: '', WindowName: 'Process Monitor - Sysinternals: www.sysinternals.com'
Modifies file system
Creates the following files
%APPDATA%\thwubui
%APPDATA%\bwcerrg
%TEMP%\49fa.exe
%TEMP%\51b8.exe
%TEMP%\7aeb.exe
%TEMP%\kvsekvtmjkzriyh.data
%TEMP%\827b.dll
%LOCALAPPDATA%\78ce57ff-4713-4a19-844d-fa756e2129b7\49fa.exe
%TEMP%\iwfmuerjwfewpav.data
%TEMP%\5244.tmp-shm
%TEMP%\6ac8.tmp-shm
Sets the 'hidden' attribute to the following files
%APPDATA%\thwubui
%APPDATA%\bwcerrg
Deletes the following files
%TEMP%\kvsekvtmjkzriyh.data
%TEMP%\iwfmuerjwfewpav.data
<SYSTEM32>\tasks\time trigger task
%TEMP%\5244.tmp-shm
%TEMP%\6ac8.tmp-shm
Deletes itself.
Network activity
Connects to
'su####lituyo.org':80
'sn####ukeutit.org':80
'li#####insteniki.org':80
'li####oumumy.org':80
'st#####luyastrelia.net':80
'ap#.2ip.ua':443
'pk#.goog':80
'79.##7.192.18':80
'ze##q.com':80
'co###umy.com':80
TCP
HTTP GET requests
http://pk#.goog/gsr1/gsr1.crt
http://79.##7.192.18/newmar.exe
http://co###umy.com/dl/build2.exe
http://ze##q.com/raud/get.php?pi#############################################
http://ze##q.com/files/1/build3.exe
HTTP POST requests
http://su####lituyo.org/
http://sn####ukeutit.org/
http://li#####insteniki.org/
http://li####oumumy.org/
http://st#####luyastrelia.net/
Other
UDP
DNS ASK on###ituyrs.org
DNS ASK su####lituyo.org
DNS ASK sn####ukeutit.org
DNS ASK li#####insteniki.org
DNS ASK li####oumumy.org
DNS ASK st#####luyastrelia.net
DNS ASK ap#.2ip.ua
DNS ASK pk#.goog
DNS ASK ze##q.com
DNS ASK co###umy.com
Miscellaneous
Searches for the following windows
ClassName: 'Registry Monitor - Sysinternals: www.sysinternals.com' WindowName: ''
ClassName: '18467-41' WindowName: ''
Creates and executes the following
'%TEMP%\49fa.exe'
'%TEMP%\51b8.exe'
'%TEMP%\7aeb.exe'
'%TEMP%\49fa.exe' --Admin IsNotAutoStart IsNotTask
'%APPDATA%\thwubui'
'%WINDIR%\syswow64\icacls.exe' "%LOCALAPPDATA%\78ce57ff-4713-4a19-844d-fa756e2129b7" /deny *S-1-1-0:(OI)(CI)(DE,DC)' (with hidden window)
'<SYSTEM32>\cmd.exe' /C "netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="%WINDIR%\rss\csrss.exe" enable=yes"' (with hidden window)
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\12E.bat" "' (with hidden window)
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\831.bat" "' (with hidden window)
'%APPDATA%\uuwubui' ' (with hidden window)
'%APPDATA%\thwubui' ' (with hidden window)
Executes the following
'<SYSTEM32>\regsvr32.exe' /s %TEMP%\827B.dll
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\831.bat" "
'<SYSTEM32>\reg.exe' add "HKEY_CURRENT_USER\Software\clicker\key" /v primary /t REG_DWORD /d 1
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\12E.bat" "
'<SYSTEM32>\cmd.exe' /C "netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="%WINDIR%\rss\csrss.exe" enable=yes"
'<SYSTEM32>\schtasks.exe' /run /tn "GoogleUpdateTaskMachineQC"
'<SYSTEM32>\powercfg.exe' /x -standby-timeout-dc 0
'<SYSTEM32>\schtasks.exe' /create /f /sc onlogon /rl highest /ru System /tn GoogleUpdateTaskMachineQC /tr "'%ProgramFiles%\Google\Chrome\updater.exe'"
'<SYSTEM32>\powercfg.exe' /x -standby-timeout-ac 0
'<SYSTEM32>\powercfg.exe' /x -hibernate-timeout-dc 0
'<SYSTEM32>\powercfg.exe' /x -hibernate-timeout-ac 0
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' <#nvjdnn#> IF([System.Environment]::OSVersion.Version -lt [System.Version]"6.2") { schtasks /create /f /sc onlogon /rl highest /ru 'System' /tn 'GoogleUpdateTaskMachineQC' /tr '''%ProgramFiles%...
'<SYSTEM32>\taskeng.exe' {C2B21F1F-2A0E-469B-A6C8-0F1E93A395CD} S-1-5-21-3150914307-1777937420-491476919-1000:rphtqmpejiqh\user:Interactive:[1]
'<SYSTEM32>\cmd.exe' /c powercfg /x -hibernate-timeout-ac 0 & powercfg /x -hibernate-timeout-dc 0 & powercfg /x -standby-timeout-ac 0 & powercfg /x -standby-timeout-dc 0
'<SYSTEM32>\sc.exe' stop bits
'<SYSTEM32>\sc.exe' stop wuauserv
'<SYSTEM32>\sc.exe' stop WaaSMedicSvc
'<SYSTEM32>\sc.exe' stop UsoSvc
'<SYSTEM32>\cmd.exe' /c sc stop UsoSvc & sc stop WaaSMedicSvc & sc stop wuauserv & sc stop bits & sc stop dosvc
'%WINDIR%\explorer.exe'
'%WINDIR%\syswow64\explorer.exe'
'%WINDIR%\syswow64\net1.exe' helpmsg 20
'%WINDIR%\syswow64\net.exe' helpmsg 20
'%WINDIR%\microsoft.net\framework\v4.0.30319\applaunch.exe'
'%WINDIR%\syswow64\icacls.exe' "%LOCALAPPDATA%\78ce57ff-4713-4a19-844d-fa756e2129b7" /deny *S-1-1-0:(OI)(CI)(DE,DC)
'<SYSTEM32>\sc.exe' stop dosvc
'%WINDIR%\syswow64\schtasks.exe' /Query
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
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