Executive Summary
Summary | |
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Title | Indicators Associated With WannaCry Ransomware |
Informations | |||
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Name | TA17-132A | First vendor Publication | 2017-05-12 |
Vendor | US-CERT | Last vendor Modification | 2017-05-16 |
Severity (Vendor) | N/A | Revision | N/A |
Security-Database Scoring CVSS v3
Cvss vector : N/A | |||
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Overall CVSS Score | NA | ||
Base Score | NA | Environmental Score | NA |
impact SubScore | NA | Temporal Score | NA |
Exploitabality Sub Score | NA | ||
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : | |||
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Cvss Base Score | N/A | Attack Range | N/A |
Cvss Impact Score | N/A | Attack Complexity | N/A |
Cvss Expoit Score | N/A | Authentication | N/A |
Calculate full CVSS 2.0 Vectors scores |
Detail
According to numerous open-source reports, a widespread ransomware campaign is affecting various organizations with reports of tens of thousands of infections in over 150 countries, including the United States, United Kingdom, Spain, Russia, Taiwan, France, and Japan. The software can run in as many as 27 different languages. The latest version of this ransomware variant, known as WannaCry, WCry, or Wanna Decryptor, was discovered the morning of May 12, 2017, by an independent security researcher and has spread rapidly over several hours, with initial reports beginning around 4:00 AM EDT, May 12, 2017. Open-source reporting indicates a requested ransom of .1781 bitcoins, roughly $300 U.S. This Alert is the result of efforts between the Department of Homeland Security (DHS) National Cybersecurity and Communications Integration Center (NCCIC) and the Federal Bureau of Investigation (FBI) to highlight known cyber threats. DHS and the FBI continue to pursue related information of threats to federal, state, and local government systems and as such, further releases of technical information may be forthcoming. Description Initial reports indicate the hacker or hacking group behind the WannaCry campaign is gaining access to enterprise servers through the exploitation of a critical Windows SMB vulnerability. Microsoft released a security update for the MS17-010 [ https://technet.microsoft.com/en-us/library/security/ms17-010.aspx ] vulnerability on March 14, 2017. Additionally, Microsoft released patches for Windows XP, Windows 8, and Windows Server 2003 [ http://www.catalog.update.microsoft.com/Search.aspx?q=KB4012598 ] operating systems on May 13, 2017. According to open sources, one possible infection vectormay be throughphishing. Technical Details "Indicators of Compromise (IOC)" IOCs are provided within the accompanying .xlsx [ https://www.us-cert.gov/sites/default/files/ALERT_TA17-132A.xlsx ] file of this report. IOCs were developed based on analysis of the malware and can be found in STIX [ https://www.us-cert.gov/sites/default/files/publications/TA17-132A_stix.xml ] format. "Analysis" Three files were submitted to US-CERT for analysis. All files are confirmed as components of a ransomware campaign identified as "WannaCry", a.k.a "WannaCrypt" or ".wnCry". The first file is a dropper, which contains and runs the ransomware, propagating via the MS17-010/EternalBlue SMBv1.0 exploit. The remaining two files are ransomware components containing encrypted plug-ins responsible for encrypting the victim users files. For a list of IOCs found during analysis, see the STIX [ https://www.us-cert.gov/sites/default/files/publications/TA17-132A_stix.xml ] file. Displayed beloware YARA signatures that can be used to detect the ransomware: "Yara Signatures" rule Wanna_Cry_Ransomware_Generic { meta: description = "Detects WannaCry Ransomware on Disk and in Virtual Page" author = "US-CERT Code Analysis Team" reference = "not set" date = "2017/05/12" hash0 = "4DA1F312A214C07143ABEEAFB695D904" strings: $s0 = {410044004D0049004E0024} $s1 = "WannaDecryptor" $s2 = "WANNACRY" $s3 = "Microsoft Enhanced RSA and AES Cryptographic" $s4 = "PKS" $s5 = "StartTask" $s6 = "wcry@123" $s7 = {2F6600002F72} $s8 = "unzip 0.15 Copyrigh" $s9 = "Global\WINDOWS_TASKOSHT_MUTEX" $s10 = "Global\WINDOWS_TASKCST_MUTEX" $s11 = {7461736B736368652E657865000000005461736B5374617274000000742E776E7279000069636163} $s12 = {6C73202E202F6772616E742045766572796F6E653A46202F54202F43202F5100617474726962202B68} $s13 = "WNcry@2ol7" $s14 = "wcry@123" $s15 = "Global\MsWinZonesCacheCounterMutexA" condition: $s0 and $s1 and $s2 and $s3 or $s4 and $s5 and $s6 and $s7 or $s8 and $s9 and $s10 or $s11 and $s12 or $s13 or $s14 or $s15 } /*The following Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as long as you use it under this license.*/ rule MS17_010_WanaCry_worm { meta: description = "Worm exploiting MS17-010 and dropping WannaCry Ransomware" author = "Felipe Molina (@felmoltor)" reference = "https://www.exploit-db.com/exploits/41987/" date = "2017/05/12" strings: $ms17010_str1="PC NETWORK PROGRAM 1.0" $ms17010_str2="LANMAN1.0" $ms17010_str3="Windows for Workgroups 3.1a" $ms17010_str4="__TREEID__PLACEHOLDER__" $ms17010_str5="__USERID__PLACEHOLDER__" $wannacry_payload_substr1 = "h6agLCqPqVyXi2VSQ8O6Yb9ijBX54j" $wannacry_payload_substr2 = "h54WfF9cGigWFEx92bzmOd0UOaZlM" $wannacry_payload_substr3 = "tpGFEoLOU6+5I78Toh/nHs/RAP" condition: all of them } "Dropper" This artifact (5bef35496fcbdbe841c82f4d1ab8b7c2) is a malicious PE32 executable that has been identified as a WannaCry ransomware dropper. Upon execution, the dropper attempts to connect to the following hard-coded URI: http[:]//www[.]iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.com. Displayed below is a sample request observed: --Begin request GET / HTTP/1.1 --End request-- If a connection is established, the dropper will terminate execution. If the connection fails, the dropper will infect the system with ransomware. --Begin service-- ServiceName = "mssecsvc2.0" --End service-- Once the malware starts as a service named mssecsvc2.0, the dropper attempts to create and scan a list of IP ranges on the local network and attempts to connect using UDP ports 137, 138 and TCP ports 139, 445. If a connection to port 445 is successful, it creates an additional thread to propigate by exploiting the SMBv1 vulnerability documented by Microsoft Security bulliten MS17-010. The malware then extracts & --Begin command-- "C:\WINDOWS\tasksche.exe /i" --End command Note: Impact Ransomware not only targets home users; businesses can also become infected with ransomware, leading to negative consequences, including * temporary or permanent loss of sensitive or proprietary information, Paying the ransom does not guarantee the encrypted files will be released; it only guarantees that the malicious actors receive the victims money, and in some cases, their banking information. In addition, decrypting files does not mean the malware infection itself has been removed. Solution *_Recommended Steps for Prevention _* * Apply the Microsoft patch for the MS17-010 SMB vulnerability dated March 14, 2017. *_Recommendations for Network Protection_* Apply the patch (MS17-010). If the patch cannot be applied, consider: * Disabling SMBv1 and "*Note:* disabling or blocking SMB may create problems by obstructing access to shared files, data, or devices. The benefits of mitigation should be weighed against potential disruptions to users." Review US-CERTs Alert on The Increasing Threat to Network Infrastructure Devices and Recommended Mitigations [ https://www.us-cert.gov/ncas/alerts/TA16-250A ] and consider implementing the following best practices: * Segregate networks and functions. *_Recommended Steps for Remediation_* * Contact law enforcement. We strongly encourage you to contact a local FBI field office upon discovery to report an intrusion and request assistance. Maintain and provide relevant logs. *_Defending Against Ransomware Generally_* Precautionary measures to mitigate ransomware threats include: * Ensure anti-virus software is up-to-date. *_Report Notice_* DHS and FBI encourages recipients who identify the use of tool(s) or techniques discussed in this document to report information to DHS or law enforcement immediately. We encourage you to contact DHSs National Cybersecurity and Communications Integration Center (NCCIC) (NCCICcustomerservice@hq.dhs.gov [ https://www.us-cert.govmailto:NCCICCustomerService@hq.dhs.gov ] or 888-282-0870), or the FBI through a local field office or the FBIs Cyber Division (CyWatch@ic.fbi.gov [ https://www.us-cert.govmailto:CyWatch@ic.fbi.gov ]or 855-292-3937) to report an intrusion and to request incident response resources or technical assistance. |
Original Source
Url : http://www.us-cert.gov/ncas/alerts/TA17-132A |
Alert History
Date | Informations |
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2017-05-17 05:23:55 |
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2017-05-15 09:23:39 |
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2017-05-13 21:22:03 |
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