Massive wave of ransomware ongoing

Massive wave of ransomware ongoing
For an updated summary, see: WannaCry/WannaCrypt Ransomware Summary For a few hours, bad news are spreading quickly about a massive wave of infections by a new ransomware called "WannaCry". We are still trying to collect more information about it. It seems that 45K attacks were detected from 74 differents countries: (Source: MalwareTech) Big targets have been telecom operators (ex: Telefonica in Spain) and hospitals in UK. Once the malware has infected a computer, it spreads across the network looking for new victims using the SMB protocol. The ransomware uses the Microsoft vulnerability MS17-10[1]. (This vulnerability was used by ETERNALBLUE[2]) Here are some IOC's that we already collected: SHA256: 09a46b3e1be080745a6d8d88d6b5bd351b1c7586ae0dc94d0c238ee36421cafa 24d004a104d4d54034dbcffc2a4b19a11f39008a575aa614ea04703480b1022c 2584e1521065e45ec3c17767c065429038fc6291c091097ea8b22c8a502c41dd 2ca2d550e603d74dedda03156023135b38da3630cb014e3d00b1263358c5f00d 4a468603fdcb7a2eb5770705898cf9ef37aade532a7964642ecd705a74794b79 SHA1: 45356a9dd616ed7161a3b9192e2f318d0ab5ad10 51e4307093f8ca8854359c0ac882ddca427a813c MD5: 509c41ec97bb81b0567b059aa2f50fe8 7bf2b57f2a205768755c07f238fb32cc 7f7ccaa16fb15eb1c7399d422f8363e8 File extension: .wncry Ransomware notification: @Please_Read_Me@.txt Emerging threats has an IDS rule that catches the ransomware activity: (ID: 2024218) 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;) Until now, the best protection is of course to patch your systems as soon as possible and keep your users aware of the new ransomware campaign to preven them to open suspicious emails/files. [1] https://technet.microsoft.com/en-us/library/security/ms17-010.aspx [2] https://isc.sans.edu/forums/diary/ETERNALBLUE+Windows+SMBv1+Exploit+Patched/22304/ We will update this diary with more information if available. Xavier Mertens (@xme) ISC Handler - Freelance Security Consultant PGP Key I will be teaching next: Reverse-Engineering Malware: Malware Analysis Tools and Techniques - SANS Paris March 2021	Xme 581 Posts ISC Handler May 15th 2017
Thread locked Subscribe	May 15th 2017 3 years ago
The ET rule includes this: flowbits:isset,ETPRO.ETERNALBLUE; Do you have the other rule that sets the ETERNALBLUE flowbit?	John 88 Posts
Quote	May 12th 2017 3 years ago
That would be 2024220. I currently do not have access the actual content of the signature.	Anonymous
Quote	May 12th 2017 3 years ago
alert smb any any -> $HOME_NET any (msg:"ET EXPLOIT Possible ETERNALBLUE MS17-010 Heap Spray"; flow:to_server,established; content:"\|ff\|SMB\|33 00 00 00 00 18 07 c0 00 00 00 00 00 00 00 00 00 00 00 00 00\|"; offset:4; depth:25; content:"\|08 ff fe 00 08 41 00 09 00 00 00 10\|"; within:12; fast_pattern; content:"\|00 00 00 00 00 00 00 10\|"; within:8; content:"\|00 00 00 10\|"; distance:4; within:4; pcre:"/^[a-zA-Z0-9+/]{1000,}/R"; threshold: type threshold, track by_src, count 12, seconds 1; classtype:trojan-activity; sid:2024217; rev:1;) 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;)	Xme 581 Posts ISC Handler
Quote	May 12th 2017 3 years ago
Here are some IOCs that allegedly hit a telecom company https://www.hybrid-analysis.com/sample/ed01ebfbc9eb5bbea545af4d01bf5f1071661840480439c6e5babe8e080e41aa?environmentId=100	Anonymous
Quote	May 13th 2017 3 years ago
open the domain Open this domain, www.iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea.com It is a killswitch for the worm. If the malware finds it, is shuts down. Malwarebytes figured it out and bought the name and setup the site. Expect a new variant yet this weekend, that bypasses this flaw.	Anonymous
Quote	May 13th 2017 3 years ago
Legacy (XP, etc.) systems patch is out: https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/	daem0n647 6 Posts
Quote	May 13th 2017 3 years ago
A killswitch has been activated stopping the spread of the virus.... https://www.theguardian.com/technology/2017/may/13/accidental-hero-finds-kill-switch-to-stop-spread-of-ransomware-cyber-attack?CMP=fb_gu	Anonymous
Quote	May 13th 2017 3 years ago
This Google search: intitle:"Index of" "WNCRY" returns a couple of dozen systems, some that are displaying things like: 404.html.bak.WNCRY, 2017-03-18 23:19, 616. [TXT], @Please_Read_Me@.txt, 2017-05-12 22:52, 933. [ ], @WanaDecryptor@.exe, 2017-05-12 02:22, 240K. I haven't been brave enough to actually click any of the links, though...	Anonymous
Quote	May 13th 2017 3 years ago
Quote:Until now, the best protection is of course to patch your systems as soon as possible and keep your users aware of the new ransomware campaign to preven them to open suspicious emails/files. In addition to this: use Software Restriction Policies to stop the PRIMARY attack vector, i.e. deny execution of anything your users can write/create (unless installed into a safe directory where only an administrator can write).	Anonymous
Quote	May 13th 2017 3 years ago
WannaCrypt Emergency Patch for pre-Windows 10 computers targeted http://www.catalog.update.microsoft.com/Search.aspx?q=KB4012598 (Microsoft) Customer Guidance for WannaCrypt attacks https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/ We are working with customers to provide additional assistance as this situation evolves, and will update this blog with details as appropriate. Phillip Misner, Principal Security Group Manager Microsoft Security Response Center Further resources: Download English language security updates: Windows Server 2003 SP2 x64, Windows Server 2003 SP2 x86, Windows XP SP2 x64,Windows XP SP3 x86, Windows XP Embedded SP3 x86, Windows 8 x86, Windows 8 x64 Download localized language security updates: Windows Server 2003 SP2 x64, Windows Server 2003 SP2 x86, Windows XP SP2 x64,Windows XP SP3 x86, Windows XP Embedded SP3 x86, Windows 8 x86, Windows 8 x64 General information on ransomware: https://www.microsoft.com/en-us/security/portal/mmpc/shared/ransomware.aspx MS17-010 Security Update: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx MS17-010: Security update for Windows SMB Server: March 14, 2017 Including Windows 10 https://support.microsoft.com/en-us/help/4013389/title http://www.trymytools.com/how-to-remove-wannacryptor-ransomware-and-decrypt-files/	Anonymous
Quote	Jun 8th 2017 3 years ago