RANSOM_CRYPCORE
Ransom:Win32/Pagongcrypt.A (Microsoft); a variant of MSIL/Filecoder.TrueCrypter.A (ESET);
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
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
Varies
EXE
No
23 Apr 2016
Encrypts files, Displays graphics/image
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 files:
- %Application Data%\Microsoft\TrueCrypter\TrueCrypter.xml
(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 copies of itself into the affected system:
- %Application Data%\Microsoft\TrueCrypter\TrueCrypter.exe
(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 creates the following folders:
- %Application Data%\Microsoft\TrueCrypter\
(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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
TrueCrypter = "%Application Data%\Microsoft\TrueCrypter\TrueCrypter.exe"
Process Termination
This Trojan terminates the following processes if found running in the affected system's memory:
- antilogger
- wireshark
- charles
- fiddler
- netmon
- reflector
- sbiectrl
- taskmgr
Other Details
This Trojan connects to the following website to send and receive information:
- sysroot.{BLOCKED}ista.org/Settings.txt
It encrypts files with the following extensions:
- .7z
- .7zip
- .arw
- .as
- .asm
- .asp
- .aspx
- .au3
- .bash
- .bat
- .bmp
- .bsh
- .c
- .cbr
- .cc
- .cer
- .cfm
- .class
- .cmd
- .config
- .cpp
- .cr2
- .crw
- .cs
- .csh
- .csproj
- .csr
- .css
- .csv
- .cxx
- .d
- .dcr
- .dds
- .deb
- .dib
- .dng
- .doc
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .dtd
- .eps
- .fla
- .fpx
- .gif
- .gz
- .gzip
- .h
- .hpp
- .hta
- .htm
- .html
- .hxx
- .ico
- .inc
- .ini
- .jad
- .java
- .jfif
- .jpe
- .jpeg
- .jpg
- .js
- .jsm
- .json
- .jsp
- .jss
- .jsx
- .kix
- .lex
- .litcofee
- .lpr
- .lua
- .m
- .mrw
- .msg
- .mx
- .nef
- .ods
- .odt
- .org
- .p
- .pages
- .pas
- .pcd
- .pdn
- .php
- .php3
- .php4
- .php5
- .phps
- .phpt
- .phtml
- .pkg
- .pl
- .pm
- .pmx
- .png
- .pot
- .potm
- .potx
- .pp
- .ppam
- .ppsm
- .ppsx
- .pptm
- .pptx
- .prproj
- .ps
- .ps1
- .psd
- .psm1
- .ptx
- .pwi
- .py
- .pyc
- .pyw
- .r
- .raf
- .rar
- .raw
- .rb
- .rbw
- .rc
- .reg
- .resx
- .rpm
- .rss
- .rtf
- .rw2
- .s
- .scpt
- .sh
- .shtml
- .sitx
- .sldm
- .sldx
- .sln
- .splus
- .src
- .swift
- .sxc
- .tar
- .tga
- .thmx
- .tif
- .tiff
- .ts
- .tsv
- .tsx
- .txt
- .vb
- .vbs
- .vcxproj
- .wpd
- .wps
- .xcodeproj
- .xht
- .xhtm
- .xhtml
- .xls
- .xlsx
- .zip
- .zipx
- pps
- ppt
- xlam
- xlsb
- xlsm
- xltm
- xltx
It does the following:
- It executes the following command to delete shadow copies:
vssadmin delete shadows /all /quiet
SOLUTION
9.800
12.490.09
26 Apr 2016
12.491.00
27 Apr 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
Search and delete these folders
- %Application Data%\Microsoft\TrueCrypter\
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
- TrueCrypter = "%Application Data%\Microsoft\TrueCrypter\TrueCrypter.exe"
- TrueCrypter = "%Application Data%\Microsoft\TrueCrypter\TrueCrypter.exe"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_CRYPCORE. 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.
Step 7
Restore encrypted files from backup.
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