TROJ_CRYPTOX.SM
Windows

Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
This Trojan connects to certain websites to send and receive information.
TECHNICAL DETAILS
2,453,504 bytes
EXE
Yes
27 May 2015
Modifies files, Connects to URLs/IPs
Arrival Details
This Trojan may be downloaded from the following remote sites:
- {BLOCKED}la7qwv37qj.onion
- {BLOCKED}la7qwv37qj.tor2web.org
Installation
This Trojan drops the following files:
- %Application Data%\tox.log - list of encrypted files.
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following non-malicious files:
- %User Startup%\tox.html - Ransom Note
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
It creates the following folders:
- %Application Data%\tox_tor
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- toxcrypt
Autostart Technique
This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\Tox.exe - copy of itself.
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Download Routine
This Trojan connects to the following URL(s) to download its component file(s):
- http://www.{BLOCKED}l.com/open_source/?download=curl_742_1.zip
- http://{BLOCKED}t.{BLOCKED}ject.org/torbrowser/4.5.1/tor-win32-0.2.6.7.zip
Other Details
This Trojan connects to the following website to send and receive information:
- http://{BLOCKED}nkssujglja.onion
- http://{BLOCKED}xg64t5wnt.onion
- http://{BLOCKED}6jut2rupu4.onion
It encrypts files with the following extensions:
- .txt
- .odt
- .ods
- .odp
- .odm
- .odb
- .doc
- .docx
- .docm
- .wps
- .xls
- .xlsx
- .xlsm
- .xlsb
- .xlk
- .ppt
- .pptx
- .pptm
- .mdb
- .accdb
- .pst
- .dwg
- .dxf
- .dxg
- .wpd
- .indd
- .cdr
- .jpg
- .jpe
- .jpeg
- .dng
- .arw
- .mef
- .mrw
- .nef
- .nrw
- .orf
- .raf
- .raw
- .rwl
- .ptx
- .pef
- .srw
- .der
- .cer
- .rtf
- .mdf
- .dbf
- .psd
- .pdd
- .eps
- .crt
- .pem
- .pfx
- .odc
- .srf
- .bay
- .crw
- .dcr
- .kdc
- .erf
- .png
- .xml
- .sql
- .php
- .asp
- .aspx
- .css
- .cpp
- .hpp
- .java
- .class
- .veg
- .aep
- .aepx
- .blend
- .prproj
- .cad
- .tif
- .sitx
- .sit
- .rmvb
- .bmp
- .pps
- .pub
- .qbb
- .swf
- .asf
- .dss
- .qxd
- .cdl
- .mswmm
- .eml
- .csv
It renames encrypted files using the following names:
- {original filename and extension}.toxcrypt
SOLUTION
9.750
11.694.09
27 May 2015
11.695.00
27 May 2015
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
Identify and terminate files detected as TROJ_CRYPTOX.SM
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Search and delete these folders
Step 4
Search and delete this file
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_CRYPTOX.SM. 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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