WORM_CRIDEX.SS

This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It executes commands from a remote malicious user, effectively compromising the affected system.

It deletes the initially executed copy of itself.

Arrival Details

This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This worm drops the following copies of itself into the affected system:

• %User Profile%\Application Data\KB{random number}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It creates the following folders:

• %User Profile%\Application Data\{random folder}

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• Local\XME{random}
• Local\XMM{random}
• Local\XMI{random}
• Local\XMS{random}
• Local\XMF{random}
• Local\XMR{random}

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
KB{random number}.exe = "%User Profile%\Application Data\KB{random number}.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{random}

Propagation

This worm creates the following folders in all removable drives:

• {random folder}

It drops the following copy(ies) of itself in all removable drives:

• {random folder}\{random file name}.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
open={random folder}\{random file name}.exe
shell\Open\Command={random folder}\{random file name}.exe
shell\Open\Default=1
shell\Explore\Command={random folder}\{random file name}.exe
shell\Autoplay\command={random folder}\{random file name}.exe

Backdoor Routine

This worm executes the following commands from a remote malicious user:

• Download and execute additional files
• Download other files
• Monitors cookies
• Steal login credentials
• Update itself
• Upload collected certificates and credentials

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://{BLOCKED}0.108:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.150.72:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.5.140:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.17.180:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}2.202:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}87.72:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.102.95:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}1.59:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}7.9:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.189.180:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.82:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}1.6:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.238.18:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.216.70:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.57.208:8080/cyACODAA/6OXs4B/movUWBAAAA/
• http://{BLOCKED}.221.186:8080/cyACODAA/6OXs4B/movUWBAAAA/

Dropping Routine

This worm drops the following files:

• %User Temp\exp70.tmp.exe - detected as TROJ_KRYPTIK.S

Information Theft

This worm monitors the Internet Explorer (IE) activities of the affected system, specifically the address bar or title bar. It recreates a legitimate website with a spoofed login page if a user visits banking sites with the following strings in the address bar or title bar:

• /ach/
• /authentication/zbf/k/
• /bb/logon/
• /cashman/
• /cashplus/
• /clkccm/
• /cmmain\.cfm
• /cmserver/
• /cmwire
• /ebc_ebc1961/
• /ibs\.
• /ibws/
• /icm/
• /icm2/
• /inets/
• /livewire/
• /loginolb/loginolb
• /netbnx/
• /olbb/
• /phcp
• /sbuser/
• /smallbiz/
• /wcmpw/
• /webcm/
• /wire/
• /wires/
• 2checkout\.com
• \.com/k1/
• ablv\.com
• access\.jpmorgan\.com
• access\.usbank\.com
• accessbankplc\.com
• accountoverview\.aspx
• accurint\.com
• achieveaccess\.citizensbank\.com
• achpayment
• achredirect\.aspx
• achweb\.unionbank\.com
• achworks\.com
• alltimetreasury\.pacificcapitalbank\.com
• alphabank\.com
• amegybank\.com/
• anb\.portalvault\.com
• atbonlinebusiness\.com
• auth\.umb\.com
• authmaster\.nationalcity\.com
• baltikums\.com
• baltikums\.eu
• banesco\.com\.pa
• bankbyweb
• bankfirst\.com
• banking\.calbanktrust\.com
• banking\.firsttennessee\.biz
• banknet\.lv
• bankofamerica\.com
• bankofbermuda\.com
• bankofcyprus\.com
• bankonline\.sboff\.com
• bankonline\.umpquabank\.com
• bbo\.1stsource\.com
• bib\.lv
• billauth
• billmenu
• bizcurrency\.com
• blilk
• bmo\.com/
• bmoharrisprivatebankingonline\.com
• bmomutualfunds\.com
• bnycash\.bankofny\.com
• bob\-w\.
• bob\.sovereignbank\.com
• bolb\-east\.associatedbank\.com
• bolb\-west\.associatedbank\.com
• bolb\.
• boveda\.banamex\.com\.mx
• bscincky\.com
• business\.macu\.com
• business\.netbankerplus\.com
• business\.swedbank\.lv
• business_solutions
• businessaccess\.citibank\.citigroup\.com
• businessappshome
• businessbanking\.cibc\.com
• businessclassonline\.compassbank\.com
• businesslogin
• businessmanager\.com
• businessonline
• businessportal\.mibank\.com
• butterfieldonline\.ky
• bxs\.com
• cashanalyzer\.com
• cashmanager\.mizuhoe\-treasurer\.com
• cashmgmt
• cashmgt
• cashproonline\.bankofamerica\.com
• cashproweb\.com/cpwportal
• cbbusinessonline\.com
• cbonline
• cencorpcu\.com
• cencorpcu\.com/
• cfgbusinessaccess\.com
• chase\.com
• checkgateway
• checkout\.com/va/login
• cib\.bankofthewest
• cibconline\.cibc\.com
• cimbanque\.net
• citizensbankmoneymanagergps\.com
• cmachm\.w
• cmbmnt\.w
• cmol\.bbt\.com/auth
• cmwirp\.w
• cnbsec1\.
• colb\.
• comerica\.com
• commercebusinessdirect\.com
• commercial\.wachovia\.com
• commercialservices
• connect\.bankcolonial\.com
• connect\.colonialbank\.com
• constitutioncorp\.org
• corpach
• corporate\.epfc\.com
• corporateaccounts
• corporatebankingweb
• corporateconnect\.net
• corpower\.coop
• createcorpwire
• createwire
• cu\.com
• cu\.org
• danskebanka\.lv
• db\-direct\.db\.com
• directline4biz\.com
• directnet\.com
• e\-moneyger
• e\-norvik\.lv
• easywebcpo\.td\.com/waw/idp
• ebanking\-services
• ebemo\.bemobank\.com
• ebill\.highmark\.com
• ecash\.
• ecm\-transfers\.unionbank\.com
• ecms\.unionbank\.com
• efirstbank\.com
• ekp\.lv
• enternetbank\.com
• enterprise2\.openbank\.com
• epd\.uscentral\.org
• eurobankefg\.com
• exact4web
• exness\.com
• express\.53\.com
• expressdeposit\.colonialbank\.com
• fbmedirect\.com
• ffinonline\.com
• ffrontier\.com
• firstbancorp\.com
• firstbanks\.com
• firstcitizens\.com
• fnfgbusinessonline\.enterprisebanker\.com
• fxpayments\.americanexpress\.com
• geonline\.lv
• global1\.onlinebank\.com
• global\-ebanking\.com
• globalink\.leumiusa\.com
• goldleaf
• guard\.scotiabank\.com
• handelsbanken\.lv
• hbcash\.exe
• hblibank\.com
• hbproxy\.exe
• hellenicnetbanking\.com
• hillsbank\.com
• hiponet\.lv
• hkbea
• hsbc\.com\.mx
• https://(.+\.web\-access|webinfocus\.mandtbank)\.com/
• https://(\w+\.)?aol.com
• https://(\w+\.)?facebook.com/
• https://(\w+\.)?google
• https://(\w+\.)?live.com
• https://(\w+\.)?twitter.com
• https://(\w+\.)?vk.com
• https://(\w+\.)?yahoo
• https://(\w+\.)?youtube.com
• https://(bolb\-(west|east)|www)\.associatedbank\.com/
• https://(ecash\.|.+/cashman/)
• https://(www\.|)cashanalyzer\.com/
• https://(www\.|)efirstbank\.com/
• https://(www\.|)enternetbank\.com/
• https://(www\.|)nashvillecitizensbank\.com/
• https://(www\.|)sterlingwires\.com/
• https://(www\.|)svbconnect\.com/
• https://(www\.|)treasury\.pncbank\.com/
• https://.*businessmanager\.com/
• https://.*citizensbank\.com/
• https://.*ebanking-services\.com/
• https://.*firstcitizens\.com/
• https://.*secure\.fundsxpress\.com/
• https://.+.tdcommercialbanking\.com/
• https://.+/(wcmfd/wcmpw|phcp/servlet)/
• https://.+/Common/SignOn/
• https://.+/cmserver/
• https://.+/ebc_ebc1961/
• https://.+/onlineserv/CM/
• https://.+\.53\.com/
• https://.+\.blilk\.com/
• https://.+\.ffinonline\.com/
• https://.+\.ffrontier\.com/
• https://.+\.firstmerit
• https://.+\.jpmorgan\.com/
• https://.+\.rbsm\.com/
• https://.+\.tdcommercialbanking\.com/
• https://.+\.unionbank\.com/
• https://accounts.google.com/ServiceLogin
• https://aol.com/.*/login/
• https://banking\.calbanktrust\.com/
• https://banking\.firsttennessee\.biz/
• https://bnycash\.bankofny\.com/
• https://business-eb\.ibanking-services\.com/
• https://businessaccess\.citibank\.citigroup\.com/
• https://businessonline\.huntington\.com/
• https://businessonline\.tdbank\.com
• https://businessonline\.tdbank\.com/
• https://businessportal\.mibank\.com
• https://cashmanager\.mizuhoe-treasurer.com/
• https://cib\.bankofthewest\.com/
• https://commercial\.wachovia\.com/Online/Financial/Business/
• https://direct.53.com/
• https://ifxmanager\.bnymellon\.com/
• https://login.live.com/
• https://login.yahoo.com/
• https://securentrycorp\.
• https://server\d+\.cey-ebanking\.com/CLKCCM/
• https://singlepoint\.usbank\.com/
• https://treas-mgt\.frostbank\.com/
• https://trz\.tranzact\.org/
• https://usgateway\d*\.rbs\.com/
• https://webbankingforbusiness\.mandtbank\.com/
• https://webcmpr\.bancopopular\.com/K1/
• https://wellsoffice\.wellsfargo\.com/
• https://www8\.comerica\.com/
• https?://(www\.|)ffbtexas\.com/
• https?://(www\d*\.|)(ntrs|northerntrust)\.com/
• https?://.+\.bancosabadellmiami\.com/
• i\-linija\.lt
• ib\.dnb\.lv
• ibanking\-services\.com
• ibbpl2\.com
• ibbpowerlink\.com
• ibbusinessnet\.com
• ibcbankonline\.ibc\.com
• ifxmanager\.bankofny\.com
• ifxmanager\.bnymellon\.com
• inetbanker
• injectreceiver
• internationalbanking\.
• internationalpayments\.
• internet\-ebanking\.com
• internetbanker\.cc
• itinternet\.net
• itreasury\.amsouth\.com
• ktt\.key\.com
• lakelandbank\.com
• libertymutualbusinessdirect\.com
• lionbank\.com
• login_business\.asp
• logincm
• loyalbank\.com
• lv\.unicreditbanking\.net
• marfinbank\.com\.cy
• mbachexpress\.com
• mcb\-home\.com/online
• memberach
• metrobankdirect\.com
• midatlanticcorp\.org
• moneymanagergps\.com
• multinetbank\.eu
• my\.statestreet\.com
• mycorporate\.org
• myonline\.bankbv\.com
• myonlineservices\.cbolobank\.com
• nashvillecitizensbank\.com
• nationalcity\.com/consultnc
• nbarizona\.com/login_business\.jsp
• nbb\.controlsecure\.com
• ncms\-inc\.com
• netteller
• nfbconnect\.com
• northbaybancorp\.com
• northerntrust\.com
• norvik\.lv
• nsbank\.com
• ntrs\.com
• nubi
• olb\.
• olb\.ent\.com/business/
• online\-offshore\.lloydstsb\.com
• online\.1stnb\.com
• online\.alphabank\.com
• online\.citadele\.lv
• online\.dollarbank\.com
• online\.ibl\.com\.lb
• online\.lkb\.lv
• online\.ovcb\.com
• online\.usb\.com\.cy
• online\.wilberbank\.com
• onlineaccess1\.com
• onlinebank\.wesbanco\.com
• onlinebanker
• onlinebanking\.1stunitedbankfl\.com
• onlinebanking\.banksterling\.com
• onlinencr\.com
• onlineserv/cm/
• otm\.suntrust\.com
• pacificenterprisebank\.com
• parex\.lv
• passport\.texascapitalbank\.com
• pastabanka\.lv
• paylinks\.cunet\.org
• payroll\.faces
• phcp/servlet
• piraeusbank\.com
• plainscapital\.gfxwebwire\.com
• portfolioonline\.metavante\.com
• premierview\.membersunited\.org
• pres_wa_wires
• privatbank\.lv
• pub/html
• rbs\.com/wps/portal/
• rbs_commercial
• rbscoutts\.com
• rbsidigital\.com
• rbsiibanking\.com
• rbsm\.com
• rbworld\.lv
• rcbcy\.com
• rietumu\.lv
• royalbank\.com/cgi\-bin/rbaccess
• rsagoidauthentication
• s2b\.
• sampopank
• sandyspringbank\.com
• scotiaconnect\.scotiabank\.com
• scottvalleybank\.com
• seb\.ee
• seb\.lt
• seb\.lv
• secure2\.umb\.com
• secure\-banking
• secure\-eccu\.org
• secure\-nvboh\.com/
• secure\.1stfedbank\.com
• secure\.accesshorizon\.com
• secure\.ally\.com
• secure\.bancinternetgroup\.com
• secure\.currency\.lloydstsb\-offshore\.com
• secure\.dalhartfederal\.com
• secure\.fnbhutch\.com
• secure\.fsbperkasie\.com
• secure\.fundsxpress\.com
• secure\.ltbbank\.com
• secure\.ltblv\.com
• securebanking\.cbtks\.com
• securentry
• secureport\.texascapitalbank\.com
• server14\.cey\-ebanking\.com
• servlet/teller
• singlepoint\.usbank\.com
• site\-secure\.com/tekportfolio
• snoras\.com
• solutions\-corporate\.com
• springbankconnect\.com/views/login/
• ssl\.selectpayment\.com/mp
• sso\.uboc
• sso\.unionbank\.com
• statebanktx\.com/cgi\-bin/prosperity\.asp
• sterlingpayment\.com
• sterlingwires\.com
• suntrust\.omniasp\.com
• svbconnect
• swedbank\.lv
• swifttransfer
• tabbank\.com
• tbb\.ee
• tdcommercialbanking
• telepc\.net
• top\.capitalonebank\.com
• towernet\.capitalonebank\.com
• trast\.net
• trastnet\.tkb\.com\.cy
• treas\-mgt\.frostbank\.com
• treasury\.pncbank\.com
• treasury\.wamu\.com
• treasurydirect\.tdbank\.com
• treasurylinkweb\.com
• treasurypathways\.com
• treasuryservices\.banknow\.texascapitalbank\.com
• trustmark\.openbank\.com
• trustweb\.com
• trz\.tranzact\.org
• ub\.lt
• unitedbankwi\.com
• usgateway2\.rbs\.com
• valartis\.at
• valartis\.li
• vectrabank\.com/busi_bank_00\.jsp
• vpbank\.com
• vpn1\.
• wblnk\.
• wcma\.businesscenter\.ml\.com
• wcmfd/wcmpw
• web\-access
• web\.accessor\.com
• webbankingforbusiness\.mandtbank\.com
• webcash
• webcashmgmt\.com
• webexpress
• webinfocus\.mandtbank\.com
• weblink\.websterbank\.com
• wellsoffice\.wellsfargo\.com
• westernbankcash\.com
• westernetbank\.com
• westfield\.accounts\-in\-view\.com
• wiretransfer
• wtdirect\.com

Other Details

This worm deletes the initially executed copy of itself

NOTES:

This backdoor collects configuration data and stores the collected data in the following registry entry:

HKEY_CURRENT_USER\Software\Microsoft\Windows NT\{random}
{default} = "{config file}"

It monitors the following browsers:

• chrome.exe
• firefox.exe
• explorer.exe

It uses a domain generation algorithm to generate random domains.