TROJ_CRYPLOCK.M
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It connects to certain websites to send and receive information.
TECHNICAL DETAILS
270,336 bytes
EXE
Yes
11 Sep 2014
Encrypts files, Connects to URLs/IPs, Displays message/message boxes
Arrival Details
This Trojan 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 Trojan drops the following copies of itself into the affected system:
- %ProgramData%\{random characters 1}.exe
- %ProgramData%\{random characters 2}\01000000
- %System Root%\Users\All Users\{random characters 1}.exe
- %System Root%\Users\All Users\{random characters 2}\01000000
(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This is usually C:\ProgramData in Windows Vista and 7, or C:\Program Files on Windows 2000, XP (32-bit), and Server 2003, or C:\Program Files (x86) on Windows XP (64-bit).. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It adds the following processes:
- explorer.exe
It injects itself into the following processes as part of its memory residency routine:
- explorer.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random name} = "%ProgramData%\{random characters 1}.exe"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\{random characters}
02000000 = "%ProgramData%\{random characters 1}.exe"
HKEY_CURRENT_USER\Software\{random characters}
01000000 = "{binary copy of itself}"
Information Theft
This Trojan gathers the following data:
- Machine GUID
- Computer name
Other Details
This Trojan connects to the following website to send and receive information:
- http://{BLOCKED}npride.net:443
NOTES:
This Trojan connects to the URL above to download the key used in encrypting the files.
It encrypts the following files and appends .encrypted to them:
- 3ds
- 3fr
- 3pr
- 7z
- ab4
- ac2
- accdb
- accde
- accdr
- accdt
- acr
- adb
- agd1
- ai
- ait
- al
- apj
- arw
- asm
- asp
- awg
- backup
- backupdb
- bak
- bdb
- bgt
- bik
- bkp
- blend
- bpw
- cdf
- cdr
- cdr3
- cdr4
- cdr5
- cdr6
- cdrw
- cdx
- ce1
- ce2
- cer
- cfp
- cgm
- cib
- cls
- cmt
- cpi
- cpp
- cr2
- craw
- crt
- crw
- csh
- csl
- css
- csv
- dac
- db
- db-journal
- db3
- dbf
- dc2
- dcr
- dcs
- ddd
- ddoc
- ddrw
- der
- design
- dgc
- djvu
- dng
- doc
- docm
- docx
- dot
- dotm
- dotx
- drf
- drw
- dwg
- dxb
- erbsql
- erf
- exf
- fdb
- ffd
- fff
- fh
- fhd
- fpx
- fxg
- gray
- grey
- gry
- hbk
- hpp
- ibank
- ibd
- ibz
- idx
- iiq
- incpas
- jpeg
- jpg
- js
- kc2
- kdbx
- kdc
- kpdx
- lua
- mdb
- mdc
- mef
- mfw
- mmw
- moneywell
- mos
- mpg
- mrw
- myd
- ndd
- nef
- nop
- nrw
- ns2
- ns3
- ns4
- nsd
- nsf
- nsg
- nsh
- nwb
- nx1
- nx2
- nyf
- odb
- odf
- odg
- odm
- odp
- ods
- odt
- orf
- otg
- oth
- otp
- ots
- ott
- p12
- p7b
- p7c
- pat
- pcd
- pef
- pem
- pfx
- php
- pl
- pot
- potm
- potx
- ppam
- pps
- ppsm
- ppsx
- ppt
- pptm
- pptx
- ps
- psafe3
- psd
- ptx
- py
- ra2
- raf
- rar
- raw
- rdb
- rtf
- rw2
- rwl
- rwz
- s3db
- sas7bdat
- sav
- sd0
- sd1
- sda
- sdf
- sldm
- sldx
- sql
- sqlite
- sqlite3
- sqlitedb
- sr2
- srf
- srw
- st4
- st5
- st6
- st7
- st8
- stc
- std
- sti
- stw
- stx
- sxc
- sxd
- sxg
- sxi
- sxm
- sxw
- txt
- wb2
- x3f
- xla
- xlam
- xll
- xlm
- xls
- xlsb
- xlsm
- xlsx
- xlt
- xltm
- xltx
- xlw
- xml
- ycbcra
- zip
After successfully encrypting user's files, it drops the ransom note DECRYPT_INSTRUCTIONS.html.
It deletes shadow copies by executing the following command:
- vssadmin.exe Delete Shadows /All /Quiet
It displays the following ransom message:
SOLUTION
9.700
10.996.07
20 Aug 2014
10.997.00
20 Aug 2014
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
Scan your computer with your Trend Micro product and note files detected as TROJ_CRYPLOCK.M
Step 4
Restart in Safe Mode
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random name} = "%ProgramData%\{random characters 1}.exe"
- {random name} = "%ProgramData%\{random characters 1}.exe"
- In HKEY_CURRENT_USER\Software\{random characters}
- 02000000 = "%ProgramData%\{random characters 1}.exe"
- 02000000 = "%ProgramData%\{random characters 1}.exe"
- In HKEY_CURRENT_USER\Software\{random characters}
- 01000000 = "{binary copy of itself}"
- 01000000 = "{binary copy of itself}"
Step 6
Search and delete these files
- DECRYPT_INSTRUCTIONS.html
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CRYPLOCK.M. 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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