BKDR_PUSHDO.J
TR/AD.Cutwail.aqcph (Avira); TrojanDropper:Win32/Cutwail (Microsoft); TrojanDropper.Cutwail (CAT-QuickHeal)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This backdoor may be downloaded by other malware/grayware from remote sites.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.
TECHNICAL DETAILS
246,272 bytes
EXE
Yes
17 Nov 2016
Connects to URLs/IPs, Compromises system security
Arrival Details
This backdoor may be downloaded by the following malware/grayware from remote sites:
Installation
This backdoor drops the following copies of itself into the affected system:
- %User Profile%\femjannacafe.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- femjannacafe
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
femjannacafe = %User Profile%\femjannacafe.exe
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\{random}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\{random}
{random 1} = {Hex Values}
HKEY_CURRENT_USER\Software\{random}
femjannacafe{random 2} = {Hex Values}
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Download and execute arbitrary files
- Retrieve Spam Configuration/Content
- Get OS Version
- Get System Information
- Get Network Information
It connects to the following websites to send and receive information:
- http://www.{BLOCKED}s.com
Other Details
This backdoor does the following:
- Perform spam-bot routine based from SPAM configuration received from C&C communication
- create svchost.exe process
- inject code and configuration to created svchost.exe
- It performs random POST Request connection to the following URLs to mask network traffic and hide the C&C communication.
- kernsafe.com
- ottospm.com
- ex-olive.com
- jroy.net
- iamdirt.com
- stnic.co.uk
- depalo.com
- sclover3.com
- x0c.com
- netcr.com
- dgmna.com
- mobilnic.net
- pwd.org
- cel-cpa.com
- dayvo.com
- medisa.info
- koz1.net
- vexcom.com
- yoruksut.com
- spanesi.com
- jenco.co.uk
- speelhal.net
- valselit.com
- t-tre.com
- transsib.com
- cokocoko.com
- otena.com
- owsports.ca
- yocinc.org
- tvtools.fi
- snugpak.com
- ora.ecnet.jp
- nelipak.nl
- h-f.net
- baijaku.com
- wkhk.net
- pb-games.com
- nunomira.com
- edimart.hu
- fcwcvt.org
- c9dd.com
- 2print.com
- wifi4all.nl
- elpro.si
- gpthink.com
- stajum.com
- valdal.com
- naoi-a.com
- pcgrate.com
- tc17.com
- crcsi.org
- maktraxx.com
- yumgiskor.kz
- olras.com
- myropcb.com
- waldi.pl
- abart.pl
- ftchat.com
- pohlfood.com
- ka-mo-me.com
- 11tochi.net
- rs-ag.com
- item-pr.com
- jacomfg.com
- medius.si
- photo4b.com
- findbc.com
- fnw.us
- abdg.com
- railbook.net
- reglera.com
- udesign.biz
- domon.com
- alteor.cl
- pupi.cz
- usadig.com
- sjbs.org
- petsfan.com
- fnsds.org
- quadlock.com
- jchysk.com
- fink.com
- tyrns.com
- vazir.se
- synetik.net
- hummer.hu
- credo.edu.pl
- aevga.com
- pdqhomes.com
- wnsavoy.com
- ora-ito.com
- evcpa.com
- pr-park.com
- fe-bauer.de
- holleman.us
- xaicom.es
- nqks.com
- mqs.com.br
- lrsuk.com
- {BLOCKED}du.com
NOTES:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.800
12.930.01
29 Nov 2016
12.931.00
30 Nov 2016
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
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
- femjannacafe = "%User Profile%\femjannacafe.exe"
- femjannacafe = "%User Profile%\femjannacafe.exe"
Step 5
The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.
- HKEY_CURRENT_USER\Software\{random}
- HKEY_CURRENT_USER\Software\{random}
- {random 1} = {Hex Values}
- HKEY_CURRENT_USER\Software\{random}
- femjannacafe{random 2} = {Hex Values}
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PUSHDO.J. 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.
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