Analysis by: Mio Fidel Villena
ALIASES:

Trojan.GenericKD.12642724 (BITDEFENDER); Trojan:Win32/Tiggre!rfn (MICROSOFT)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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

It encrypts files with specific file extensions. It encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size: 2,061,955 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 01 Dec 2017
Payload: Connects to URLs/IPs, Drops files, Encrypts files, Displays windows

Arrival Details

This Ransomware 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 Ransomware drops the following files:

  • %System Root%\krecik\testtest.txt.txt
  • %System Root%\krecik\sandblast.pdf
  • %System Root%\krecik\READMYFIRST.info
  • %System Root%\krecik\bbb.vbs
  • %System Root%\krecik\aaa.vbs
  • %System Root%\krecik\aaa.png
  • %System Root%\krecik\Clicocryptor.jar
  • %System Root%\ClicoCrypter\encryption.key

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It adds the following processes:

  • cmd.exe /c "REG add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run" /t REG_SZ /d "abc.exe" /f /v ccrpt"
  • cmd.exe /c "taskkill.exe /f /im Microsoft.Exchange.*"
  • cmd.exe /c "taskkill.exe /f /im MsExchange*"
  • cmd.exe /c "taskkill.exe /f /im sqlserver.exe"
  • cmd.exe /c "taskkill.exe /f /im sqlwriter.exe"
  • cmd.exe /c "taskkill.exe /f /im mysqld.exe"
  • cmd.exe /c "vssadmin Delete Shadows /ALL /quiet"
  • cmd.exe /c "wmic shadowcopy delete"
  • cmd.exe /c "bcdedit.exe /set recoveryenabled no"
  • cmd.exe /c "REG add "HKEY_CURRENT_USER\Control Panel\Desktop" /t REG_SZ /d "%System Root%\ClicoCrypter\aaa.bmp" /f /v Wallpaper"
  • cmd.exe /c "reg add "HKEY_CURRENT_USER\Control Panel\Desktop" /v WallpaperStyle /f /t REG_SZ /d 10"
  • cmd.exe /c "RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters "

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It creates the following folders:

  • %System Root%\ClicoCrypter\
  • %System Root%\krecik\

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ccrpt = "abc.exe"

Other System Modifications

This Ransomware changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "C:\ClicoCrypter\aaa.bmp"

Other Details

This Ransomware does the following:

  • Requires Java Runtime Environment
  • This ransomware is possibly a research-type ransomware.
  • C:\ClicoCrypter\READMYFIRST.info contains:
  • It shows following windows after execution:


  • It connects to the following URL after encryption:
    • http://www.{BLOCKED}o.{BLOCKED}l
    • http://www.{BLOCKED}g.{BLOCKED}g.pl/cryptor.php
    • http://{BLOCKED}sdkljfksjd.{BLOCKED}n
    • http://{BLOCKED}sdkjfkdjsf.{BLOCKED}n
    • http://{BLOCKED}sdnfoeitpfsdfsd.{BLOCKED}n
    • http://{BLOCKED}sdkjfsjdkfjksdiewjrjkfjsdkfjd.{BLOCKED}g.pl
    • http://{BLOCKED}f.{BLOCKED}ermaps.com/h/m/a/0/ff0000/128/0/5izjy9fggg1.png

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .der
  • .pfx
  • .crt
  • .csr
  • .pem
  • .odt
  • .ott
  • .sxw
  • .stw
  • .uot
  • .max
  • .ods
  • .ots
  • .sxc
  • .stc
  • .dif
  • .slk
  • .odp
  • .otp
  • .sxd
  • .std
  • .uop
  • .odg
  • .otg
  • .sxm
  • .mml
  • .lay
  • .lay6
  • .asc
  • .sqlite3
  • .sqlitedb
  • .sql
  • .accdb
  • .mdb
  • .dbf
  • .odb
  • .frm
  • .myd
  • .myi
  • .ibd
  • .mdf
  • .ldf
  • .sln
  • .suo
  • .cpp
  • .pas
  • .asm
  • .cmd
  • .bat
  • .vbs
  • .dip
  • .dch
  • .sch
  • .brd
  • .jsp
  • .php
  • .asp
  • .class
  • .wav
  • .swf
  • .fla
  • .wmv
  • .mpg
  • .vob
  • .mpeg
  • .asf
  • .avi
  • .mov
  • .mkv
  • .flv
  • .wma
  • .mid
  • .djvu
  • .svg
  • .psd
  • .nef
  • .tiff
  • .tif
  • .cgm
  • .raw
  • .gif
  • .bmp
  • .jpg
  • .jpeg
  • .vcd
  • .iso
  • .backup
  • .zip
  • .rar
  • .tgz
  • .tar
  • .bak
  • .tbk
  • .PAQ
  • .ARC
  • .aes
  • .gpg
  • .vmx
  • .vmdk
  • .vdi
  • .sldm
  • .sldx
  • .sti
  • .sxi
  • .hwp
  • .snt
  • .onetoc2
  • .dwg
  • .pdf
  • .wks
  • .rtf
  • .csv
  • .txt
  • .vsdx
  • .vsd
  • .edb
  • .eml
  • .msg
  • .ost
  • .pst
  • .potm
  • .potx
  • .ppam
  • .ppsx
  • .ppsm
  • .pps
  • .pot
  • .pptm
  • .pptx
  • .ppt
  • .xltm
  • .xltx
  • .xlc
  • .xlm
  • .xlt
  • .xlw
  • .xlsb
  • .xlsm
  • .xlsx
  • .xls
  • .dotx
  • .dotm
  • .dot
  • .docm
  • .docb
  • .docx
  • .doc

It encrypts files found in the following folders:

  • %System Root%\

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.828.06
FIRST VSAPI PATTERN DATE: 07 Dec 2017
VSAPI OPR PATTERN File: 13.829.00
VSAPI OPR PATTERN Date: 08 Dec 2017

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

Delete this registry value

[ Learn More ]

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
    • ccrpt = "abc.exe"

Step 4

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\ClicoCrypter\
  • %System Root%\krecik\

Step 5

Scan your computer with your Trend Micro product to delete files detected as RANSOM_CLICOCRYP.B. 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 the following Trend Micro Support pages for more information:

Step 6

Reset your Desktop properties

[ Learn More ]


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