BKDR_CRIDEX.RY
Infostealer (Symantec)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system and executes them:
- %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 name}
(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{8 random characters}
- Local\XMI{8 random characters}
- Local\XMM{8 random characters}
- Local\XMS{8 random characters}
- Local\XMF{8 random characters}
- Local\XMR{8 random characters}
- Local\XMQ{8 random characters}
- Local\XMB{8 random characters}
It injects codes into the following process(es):
- explorer.exe
Autostart Technique
This backdoor 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 backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{random value 1}
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{random value 2}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Monitor browser cookies
- Download and execute arbitrary files
- Upload stolen information
- Download configuration files
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}.{BLOCKED}.100.108:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.150.72:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.5.140:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.17.180:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.172.202:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.187.72:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.102.95:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.61.59:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.237.9:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.189.180:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.89.82:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.221.6:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.238.18:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.216.70:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.57.208:8080/jsbqmCA/hCpyb/Cnw/ED/
- http://{BLOCKED}.{BLOCKED}.221.186:8080/jsbqmCA/hCpyb/Cnw/ED/
Information Theft
This backdoor monitors the Internet Explorer (IE) activities of the affected system, specifically the address 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 and/or title bar:
- \.com/k1/
- /ach/
- /authentication/zbf/k/
- /bb/logon/
- chase\.com
- /cashman/
- /cashplus/
- /clkccm/
- /cmmain\.cfm
- /cmserver/
- /cmwire
- achredirect\.aspx
- cbonline
- /ebc_ebc1961/
- /ibs\.
- /ibws/
- /icm/
- /icm2/
- /inets/
- /livewire/
- /loginolb/loginolb
- /netbnx/
- /olbb/
- /phcp
- /sbuser/
- /smallbiz/
- /wcmpw/
- /webcm/
- /wire/
- /wires/
- 2checkout\.com
- ablv\.com
- access\.jpmorgan\.com
- access\.usbank\.com
- accessbankplc\.com
- accountoverview\.aspx
- accurint\.com
- achieveaccess\.citizensbank\.com
- achpayment
- 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
- accurint\.com
- plainscapital\.gfxwebwire\.com
- sterlingpayment\.com
- rbsm\.com
- business\.swedbank\.lv
- secure\.accesshorizon\.com
- myonline\.bankbv\.com
- cencorpcu\.com/
- banknet\.lv
- 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_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
- bankofamerica\.com
- cashproweb\.com/cpwportal
- cbbusinessonline\.com
- cencorpcu\.com
- cfgbusinessaccess\.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
- fir
Other Details
This backdoor deletes the initially executed copy of itself
NOTES:
It monitors the following browsers:
- chrome.exe
- firefox.exe
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Scan your computer with your Trend Micro product and note files detected as BKDR_CRIDEX.RY
Step 3
Restart in Safe Mode
Step 4
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT
- {random value 1}
- {random value 1}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT
- {random value 2}
- {random value 2}
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- KB{random number}.exe = "%User Profile%\Application Data\KB{random number}.exe"
- KB{random number}.exe = "%User Profile%\Application Data\KB{random number}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- GlobalUserOffline = "0"
- GlobalUserOffline = "0"
Step 6
Search and delete this folder
- %User Profile%\Application Data\{random folder name}
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_CRIDEX.RY. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
NOTES:
The created registry keys HKEY_CURRENT_USER\Software\Microsoft\Windows NT\{random value 1} and HKEY_CURRENT_USER\Software\Microsoft\Windows NT\{random value 2} cannot be identified by the users since there are no reference values in the created keys. The only way these keys can be identified is by comparing the present keys with a backup if the users have one. Note that these keys need not be deleted since it won't cause the user system any harm
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