hai guys
sorry for the delay post
there is new type of virus called WANNA CRY which released from north krea according to indians ,but according to the russaians due to the american agency NSA million of data bytes are stole from them and it id used to create this type of worm.
what is RANSOMWARE ?
according to wikipedia
Ransomware is a type of malicious software that carries out the cryptoviral extortion attack from cryptovirology that blocks access to data until a ransom is paid and displays a message requesting payment to unlock it.
How to get your data back without paying the ransom
There hundreds of types of ransomware out there, but cyber security researchers are working around the clock to break the encryption that at least some of them use. Unfortunately, the most notorious families have proven to be unbreakable so far. In spite of this, there are many other cryptoware strains that are not that well coded and which specialists were able to crack.
We recommend you read about how these tools work beforehand so that you’re sure that this is the best solution for your case.
Do keep in mind that decryptors could become obsolete because of constant updates and new, enhanced versions released by cyber criminals. It’s a never-ending battle, which is why we urge you to focus on prevention and having multiple backups for your data.
the attack with this ransomware is massive and it uses the unsecured a patch file definition in the windows xp
most of the world level organisation uses windows xp .but the microsoft has officially closed the update still they pass many organisation to keep their data secured .
TO PREVENT THE WANNACRY
for the prevention of the wannacry virus we have to keep update of the syatem
windows xp user please update your firewall and keep your antivirus updated
It also drops a file named !Please Read Me!.txt which contains the text explaining what has happened and how to pay the ransom.
Source: Symantec
WannaCry encrypts files with the following extensions, appending .WCRY to the end of the file name:
- .lay6
- .sqlite3
- .sqlitedb
- .accdb
- .java
- .class
- .mpeg
- .djvu
- .tiff
- .backup
- .vmdk
- .sldm
- .sldx
- .potm
- .potx
- .ppam
- .ppsx
- .ppsm
- .pptm
- .xltm
- .xltx
- .xlsb
- .xlsm
- .dotx
- .dotm
- .docm
- .docb
- .jpeg
- .onetoc2
- .vsdx
- .pptx
- .xlsx
- .docx
The file extensions that the malware is targeting contain certain clusters of formats including:
- Commonly used office file extensions (.ppt, .doc, .docx, .xlsx, .sxi).
- Less common and nation-specific office formats (.sxw, .odt, .hwp).
- Archives, media files (.zip, .rar, .tar, .bz2, .mp4, .mkv)
- Emails and email databases (.eml, .msg, .ost, .pst, .edb).
- Database files (.sql, .accdb, .mdb, .dbf, .odb, .myd).
- Developers' sourcecode and project files (.php, .java, .cpp, .pas, .asm).
- Encryption keys and certificates (.key, .pfx, .pem, .p12, .csr, .gpg, .aes).
- Graphic designers, artists and photographers files (.vsd, .odg, .raw, .nef, .svg, .psd).
- Virtual machine files (.vmx, .vmdk, .vdi).
Indicators of compromise:
Ransomware is writing itself into a random character folder in the 'ProgramData' folder with the file name of "tasksche.exe" or in 'C:\Windows\' folder with the file-name "mssecsvc.exe" and "tasksche.exe".
Ransomware is granting full access to all files by using the command:
Icacls . /grant Everyone:F /T /C /Q
Using a batch script for operations:
176641494574290.bat
hashes for WANNACRY ransomware:
5bef35496fcbdbe841c82f4d1ab8b7c2
775a0631fb8229b2aa3d7621427085ad
7bf2b57f2a205768755c07f238fb32cc
7f7ccaa16fb15eb1c7399d422f8363e8
8495400f199ac77853c53b5a3f278f3e
84c82835a5d21bbcf75a61706d8ab549
86721e64ffbd69aa6944b9672bcabb6d
8dd63adb68ef053e044a5a2f46e0d2cd
b0ad5902366f860f85b892867e5b1e87
d6114ba5f10ad67a4131ab72531f02da
db349b97c37d22f5ea1d1841e3c89eb4
e372d07207b4da75b3434584cd9f3450
f529f4556a5126bba499c26d67892240
- use endpoint protection/antivirus solutions to detect these files and remove the same
Network Connections
The malware use TOR hidden services for command and control. The list of .onion domains inside is as following:
- gx7ekbenv2riucmf.onion
- 57g7spgrzlojinas.onion
- Xxlvbrloxvriy2c5.onion
- 76jdd2ir2embyv47.onion
- cwwnhwhlz52maqm7.onion
- sqjolphimrr7jqw6.onion
Note: For update on latest Indicators of Compromises, please see references to security vendors given in references section
Specific Countermeasures to prevent Wannacry/WannaCrypt Ransomware:
Users and administrators are advised to take the following preventive measures to protect their computer networks from ransomware infection/ attacks:
In order to prevent infection users and organizations are advised to apply patches to Windows systems as mentioned in Microsoft Security Bulletin MS17-010
-
To prevent data loss Users & Organisations are advised to take backup of Critical Data
Block SMB ports on Enterprise Edge/perimeter network devices [UDP 137, 138 and TCP 139, 445] or Disable SMBv1. https://support.microsoft.com/en-us/help/2696547
- Apply following signatures/rules at IDS/IPS
alert tcp $HOME_NET 445 -> any any (msg:"ET EXPLOIT Possible ETERNALBLUE MS17-010 Echo Response"; flow:from_server,established; content:"|00 00 00 31 ff|SMB|2b 00 00 00 00 98 07 c0|"; depth:16; fast_pattern; content:"|4a 6c 4a 6d 49 68 43 6c 42 73 72 00|"; distance:0; flowbits:isset,ETPRO.ETERNALBLUE; classtype:trojan-activity; sid:2024218; rev:2;)
(http://docs.emergingthreats.net/bin/view/Main/2024218)
alert smb any any -> $HOME_NET any (msg:"ET EXPLOIT Possible ETERNALBLUE MS17-010 Echo Request (set)"; flow:to_server,established; content:"|00 00 00 31 ff|SMB|2b 00 00 00 00 18 07 c0|"; depth:16; fast_pattern; content:"|4a 6c 4a 6d 49 68 43 6c 42 73 72 00|"; distance:0; flowbits:set,ETPRO.ETERNALBLUE; flowbits:noalert; classtype:trojan-activity; sid:2024220; rev:1;)
alert smb $HOME_NET any -> any any (msg:"ET EXPLOIT Possible ETERNALBLUE MS17-010 Echo Response"; flow:from_server,established; content:"|00 00 00 31 ff|SMB|2b 00 00 00 00 98 07 c0|"; depth:16; fast_pattern; content:"|4a 6c 4a 6d 49 68 43 6c 42 73 72 00|"; distance:0; flowbits:isset,ETPRO.ETERNALBLUE; classtype:trojan-activity; sid:2024218; rev:1;)
- Yara:
rule wannacry_1 : ransom
{
meta:
author = "Joshua Cannell"
description = "WannaCry Ransomware strings"
weight = 100
date = "2017-05-12"
Strings:
$s1 = "Ooops, your files have been encrypted!" wide ascii nocase
$s2 = "Wanna Decryptor" wide ascii nocase
$s3 = ".wcry" wide ascii nocase
$s4 = "WANNACRY" wide ascii nocase
$s5 = "WANACRY!" wide ascii nocase
$s7 = "icacls . /grant Everyone:F /T /C /Q" wide ascii nocase
Condition:
any of them
}
rule wannacry_2{
meta:
author = "Harold Ogden"
description = "WannaCry Ransomware Strings"
date = "2017-05-12"
weight = 100
strings:
$string1 = "msg/m_bulgarian.wnry"
$string2 = "msg/m_chinese (simplified).wnry"
$string3 = "msg/m_chinese (traditional).wnry"
$string4 = "msg/m_croatian.wnry"
$string5 = "msg/m_czech.wnry"
$string6 = "msg/m_danish.wnry"
$string7 = "msg/m_dutch.wnry"
$string8 = "msg/m_english.wnry"
$string9 = "msg/m_filipino.wnry"
$string10 = "msg/m_finnish.wnry"
$string11 = "msg/m_french.wnry"
$string12 = "msg/m_german.wnry"
$string13 = "msg/m_greek.wnry"
$string14 = "msg/m_indonesian.wnry"
$string15 = "msg/m_italian.wnry"
$string16 = "msg/m_japanese.wnry"
$string17 = "msg/m_korean.wnry"
$string18 = "msg/m_latvian.wnry"
$string19 = "msg/m_norwegian.wnry"
$string20 = "msg/m_polish.wnry"
$string21 = "msg/m_portuguese.wnry"
$string22 = "msg/m_romanian.wnry"
$string23 = "msg/m_russian.wnry"
$string24 = "msg/m_slovak.wnry"
$string25 = "msg/m_spanish.wnry"
$string26 = "msg/m_swedish.wnry"
$string27 = "msg/m_turkish.wnry"
$string28 = "msg/m_vietnamese.wnry"
condition:
any of ($string*)
}
Best practices to prevent ransomware attacks:
- Perform regular backups of all critical information to limit the impact of data or system loss and to help expedite the recovery process. Ideally, this data should be kept on a separate device, and backups should be stored offline.
- Establish a Sender Policy Framework (SPF),Domain Message Authentication Reporting and Conformance (DMARC), and DomainKeys Identified Mail (DKIM) for your domain, which is an email validation system designed to prevent spam by detecting email spoofing by which most of the ransomware samples successfully reaches the corporate email boxes.
- Don't open attachments in unsolicited e-mails, even if they come from people in your contact list, and never click on a URL contained in an unsolicited e-mail, even if the link seems benign. In cases of genuine URLs close out the e-mail and go to the organization's website directly through browser
- Restrict execution of powershell /WSCRIPT in enterprise environment Ensure installation and use of the latest version (currently v5.0) of PowerShell, with enhanced logging enabled. script block logging, and transcription enabled. Send the associated logs to a centralized log repository for monitoring and analysis.
- Application whitelisting/Strict implementation of Software Restriction Policies (SRP) to block binaries running from %APPDATA%, %PROGRAMDATA% and %TEMP% paths. Ransomware sample drops and executes generally from these locations. Enforce application whitelisting on all endpoint workstations.
- Deploy web and email filters on the network. Configure these devices to scan for known bad domains, sources, and addresses; block these before receiving and downloading messages. Scan all emails, attachments, and downloads both on the host and at the mail gateway with a reputable antivirus solution.
- Disable macros in Microsoft Office products. Some Office products allow for the disabling of macros that originate from outside of an organization and can provide a hybrid approach when the organization depends on the legitimate use of macros. For Windows, specific settings can block macros originating from the Internet from running.
- Configure access controls including file, directory, and network share permissions with least privilege in mind. If a user only needs to read specific files, they should not have write access to those files, directories, or shares.
- Maintain updated Antivirus software on all systems
- Consider installing Enhanced Mitigation Experience Toolkit, or similar host-level anti-exploitation tools.
- Block the attachments of file types, exe|pif|tmp|url|vb|vbe|scr|reg|cer|pst|cmd|com|bat|dll|dat|hlp|hta|js|wsf
- Regularly check the contents of backup files of databases for any unauthorized encrypted contents of data records or external elements, (backdoors /malicious scripts.)
- Keep the operating system third party applications (MS office, browsers, browser Plugins) up-to-date with the latest patches.
- Follow safe practices when browsing the web. Ensure the web browsers are secured enough with appropriate content controls.
- Network segmentation and segregation into security zones - help protect sensitive information and critical services. Separate administrative network from business processes with physical controls and Virtual Local Area Networks.
- Disable remote Desktop Connections, employ least-privileged accounts.
- Ensure integrity of the codes /scripts being used in database, authentication and sensitive systems, Check regularly for the integrity of the information stored in the databases.
- Restrict users' abilities (permissions) to install and run unwanted software applications.
- Enable personal firewalls on workstations.
- Implement strict External Device (USB drive) usage policy.
- Employ data-at-rest and data-in-transit encryption.
- Carry out vulnerability Assessment and Penetration Testing (VAPT) and information security audit of critical networks/systems, especially database servers from CERT-IN empaneled auditors. Repeat audits at regular intervals.
- Individuals or organizations are not encouraged to pay the ransom, as this does not guarantee files will be released. Report such instances of fraud to CERT-In and Law Enforcement agencies
Generic Prevention Tools:
References
