Trojan.DownLoader25.22977

Technical Information

Malicious functions:

Creates and executes the following:

'%TEMP%\MakerPanda\dpinst-x86.exe' /sw

Modifies file system:

Creates the following files:

%APPDATA%\Microsoft\CryptnetUrlCache\Content\696F3DE637E6DE85B458996D49D759AD
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\696F3DE637E6DE85B458996D49D759AD
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\E48DDEA3BF68DF580551FA0F27950B54
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\F90F18257CBB4D84216AC1E1F3BB2C76
%APPDATA%\Microsoft\CryptnetUrlCache\Content\E48DDEA3BF68DF580551FA0F27950B54
%APPDATA%\Microsoft\CryptnetUrlCache\Content\A6D8662C7600817D67B3C1A03BC53A1B
%APPDATA%\Microsoft\CryptnetUrlCache\Content\C8E7EC0C85688F4738F3BE49B104BA67
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\C8E7EC0C85688F4738F3BE49B104BA67
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\8A9510437CB4EEB09F4B3AC2BC980E19
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\A6D8662C7600817D67B3C1A03BC53A1B
%APPDATA%\Microsoft\CryptnetUrlCache\Content\8A9510437CB4EEB09F4B3AC2BC980E19
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\CH341PT.DLL
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\CH341SER.VXD
<SYSTEM32>\CatRoot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\oem3.CAT
%WINDIR%\inf\oem3.PNF
%WINDIR%\inf\oem3.inf
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\CH341S98.SYS
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\ch341ser.inf
%APPDATA%\Microsoft\CryptnetUrlCache\Content\F90F18257CBB4D84216AC1E1F3BB2C76
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\CH341SER.CAT
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\CH341S64.SYS
<SYSTEM32>\DRVSTORE\ch341ser_A3AA17C2BAE326ECBD19B4969FD36724299D5ABD\CH341SER.SYS
%TEMP%\MakerPanda\arduino.cat
%TEMP%\MakerPanda\CH341SER.VXD
%TEMP%\MakerPanda\ch341SER.CAT
%TEMP%\MakerPanda\CH341PT.DLL
%TEMP%\MakerPanda\dpinst-amd64.exe
%TEMP%\MakerPanda\CH341SER.SYS
%TEMP%\MakerPanda\arduino.inf
<DRIVERS>\usbser.sys
%TEMP%\MakerPanda\Arduino.cer
%TEMP%\MakerPanda\CH341S98.SYS
%TEMP%\MakerPanda\CH341SER.INF
%APPDATA%\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
<SYSTEM32>\dllcache\usbser.sys.new
%APPDATA%\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
<DRIVERS>\SET4.tmp
%TEMP%\MakerPanda\dpinst-x86.exe
%TEMP%\MakerPanda\CH341S64.SYS
%WINDIR%\DPINST.LOG
%WINDIR%\LastGood\TMP2.tmp
<DRIVERS>\SET1.tmp

Sets the 'hidden' attribute to the following files:

<SYSTEM32>\CatRoot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\oem3.CAT

Deletes the following files:

%TEMP%\Cab21.tmp
%TEMP%\Cab23.tmp
%TEMP%\Cab25.tmp
%TEMP%\Cab1B.tmp
%TEMP%\Cab1D.tmp
%TEMP%\Cab1F.tmp
%TEMP%\Cab2D.tmp
%TEMP%\Cab2F.tmp
%TEMP%\Cab31.tmp
%TEMP%\Cab27.tmp
%TEMP%\Cab29.tmp
%TEMP%\Cab2B.tmp
%TEMP%\Cab9.tmp
%TEMP%\CabB.tmp
%TEMP%\CabD.tmp
<DRIVERS>\SET1.tmp
%TEMP%\Cab5.tmp
%TEMP%\Cab7.tmp
%TEMP%\Cab15.tmp
%TEMP%\Cab17.tmp
%TEMP%\Cab19.tmp
%TEMP%\CabF.tmp
%TEMP%\Cab11.tmp
%TEMP%\Cab13.tmp

Moves the following files:

from <DRIVERS>\usbser.sys to <DRIVERS>\OLD3.tmp
from %WINDIR%\LastGood\TMP2.tmp to %WINDIR%\LastGood\system32\drivers\usbser.sys

Substitutes the following files:

<DRIVERS>\usbser.sys

Network activity:

Connects to:

'cr#.##obalsign.com':80
'20#.#6.232.182':80
'cr#.##obalsign.net':80
'wp#d':80
'www.download.windowsupdate.com':80

TCP:

HTTP GET requests:

http://crl.microsoft.com/pki/crl/products/microsoftrootcert.crl via 20#.#6.232.182
http://cr#.##obalsign.com/gs/gstimestampingg2.crl
http://crl.microsoft.com/pki/crl/products/MicrosoftTimeStampPCA.crl via 20#.#6.232.182
http://www.microsoft.com/pki/CRL/products/Microsoft%20Windows%20Hardware%20Compatibility%20PCA(1).crl via 20#.#6.232.182
http://cr#.##obalsign.com/gs/gscodesigng2.crl
http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt
http://11#.#11.111.1/wpad.dat via wp#d
http://cr#.##obalsign.net/root.crl
http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab

UDP: