New Ransomware Variant Nyetya Compromises Systems Worldwide. Note This blog post discusses active research by Talos into a new threat. This information should be considered preliminary and will be updated as research continues. Update 2. 01. 7 0. EDT Updated to explain the modified Double. Pulsar backdoor. Since the Sam. Sam attacks that targeted US healthcare entities in March 2. Talos has been concerned about the proliferation of malware via unpatched network vulnerabilities. In May 2. 01. 7, Wanna. Cry ransomware took advantage of a vulnerability in SMBv. Internet. Today a new malware variant has surfaced that is distinct enough from Petya that people have referred to it by various names such as Petrwrap and Golden. I/51jPG9AhckL.jpg' alt='Lexmark 4550 Installation Disk' title='Lexmark 4550 Installation Disk' />Eye. Talos is identifying this new malware variant as Nyetya. The sample leverages Eternal. Blue, Eternal. Romance, WMI, and Ps. Exec for lateral movement inside an affected network. This behavior is detailed later in the blog under Malware Functionality. Unlike Wanna. Cry, Nyetya does not appear to contain an external scanning component. The identification of the initial vector is still under investigation. We have observed no use of email or Office documents as a delivery mechanism for this malware. We believe that infections are associated with software update systems for a Ukrainian tax accounting package called Me. Doc. Talos is investigating this currently. Given the circumstances of this attack, Talos assesses with high confidence that the intent of the actor behind Nyetya was destructive in nature and not economically motivated. Talos strongly recommends users and organizations decline to pay the ransom. Any attempts to obtain a decryption key will be fruitless as the associated mailbox used for payment verification and decryption key sharing has been shut down by the posteo. 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This renders any successful payment as useless as there is no method of communication available for this actor to use to verify payments from victims or distribute decryption keys once ransom payments have been received. There is also no method used by the malware to directly connect to command and control for remote unlocking. Recovery of User Credentials. Download Movies To Ipad. Nyetya requires user credentials to spread itself laterally via the Ps. Exec and WMI vectors which are detailed in the Malware Functionality section. Talos has identified three ways Nyetya can obtain these credentials. First, credentials can be manually passed in via a command line argument. Here is the syntax rundll. C Windowsperfc. A second method consists to use the Cred. Enumerate. W Windows API. Finally, Perfc. dat contains three embedded executables in its resource section which are compressed with zlib. Two of the executables are used to recover user credentials 3. Ps. Exec binary. The executables related to credential recovery are dropped as a temporary files in the users TEMP folder and run with a named pipe parameter containing a GUID. The main executable communicates with the dropped executable using this named pipe. For example C WINDOWSTEMP5. D. tmp,. pipeC1. F0. BF2. D 8. C1. AF5. A 6. 5A2. 2C6. C. The dropped. Mimikatz, a popular open source tool used for recovery of user credentials from computer memory using several different techniques. However, Talos has confirmed that the executable is not specifically the Mimikatz tool. The recovered credentials are then used for launching malware on the remote system using WMIC and Ps. Exec. This is detailed below. Malware Functionality. Perfc. dat contains the functionality needed to further compromise the system and contains a single unnamed export function referred to as 1. As part of the propagation process, the malware enumerates all visible machines on the network via the Net. Server. Enum API call and then scans for an open TCP 1. This is done to compile a list of devices that expose this port and may possibly be susceptible to compromise. Nyetya has several mechanisms that are used to propagate once a device is infected. Eternal. Blue the same exploit used by Wanna. Cry. Eternal. Romance an SMBv. Shadow. Brokers. Ps. Exec a legitimate Windows administration tool. WMI Windows Management Instrumentation, a legitimate Windows component. These mechanisms are used to attempt installation and execution of perfc. For systems that have not had MS1. Eternal. Blue and Eternal. Romance exploits are leveraged to compromise systems. The exploit launched against the victim system depends on the operating system of the intended target. Eternal. Blue. Windows Server 2. R2. Windows Server 2. Windows 7. Eternal. Romance. Windows XPWindows Server 2. Windows Vista. The two exploits drop a modified version of Double. Pulsar which is a persistent backdoor running in kernel space of the compromised system. The developer modified only few bytes from the original version but this modification allowed it to evade network detection and the open source Double. Pulsar scanning tools available on the Internet. The modification can be divided in 3 parts The attacker modified the command codes Original Command Code. Nyetya Command Code. Purpose. 0x. 23. 0x. F0. PING0x. 77. 0x. F1. KILL0x. C8. 0x. F2. EXECThe attacker modified the response codes Original Response Code. Nyetya Response Code. Purpose. 0x. 10. 0x. OK0x. 20. 0x. 21. CMDINVALID0x. 30. ALLOCATIONFAILUREThe attacker modified where the response code is stored in the SMB response packet. In the original version of Douple. Pulsar, the code was stored in the Multiplex. ID field offset 0x. E. In the Nyetya version, the response code is stored in a reserved field offset 0x. We implemented a specific NGIPS Snort rule to detect this Double. Pulsar variant 4. Ps. Exec is used to execute the following instruction where w. IP address using the current users windows token from the Recovery of User Credentials section above to install the malware on the networked device. C WINDOWSdllhost. C WindowsSystem. C Windowsperfc. WMI is used to execute the following command which performs the same function as above, but using the current users username and password as username and password, retrieved from the Recovery of User Credentials section above. Wbemwmic. exe node w. C WindowsSystem. C Windowsperfc. Once a system is successfully compromised, the malware encrypts files on the host using 2. RSA encryption. Additionally, the malware cleans event logs on the compromised device using the following command wevtutil cl Setup wevtutil cl System wevtutil cl Security wevtutil cl Application fsutil usn deletejournal D c. Nytetya attempts to obtain administrative privileges Se. Shutdow. Privilege and Se. Debug. Privilege for the current user through the Windows API Adjust. Token. Privileges. If successful, Nyetya overwrites the boot sector on Physical. Drive. 0 without first saving a copy. If overwriting the boot sector fails, Nyetya instead wipes the first ten sectors of the disk drive. Additionally, if Nyetya finds a process file name hash of 2. E2. 14. B4. 4 on the system, it will also wipe the first ten sectors of the disk drive. Talos has identified that this hash is referring to avp. Kaspersky Anti virus. Systems that have the boot sector overwritten will see this message when restarting their systems. Note that regardless of whether Nyetya is successful in overwriting the boot sector or not, it will proceed to create a scheduled task via schtasks to reboot the system one hour after infection. Without analyzing the key generation or key storage components, Talos believes that the actors behind Nyetya did not intended for the boot sector or the ten sectors that are wiped to be restorable. Thus, Nyetya is intended to be destructive rather than as a tool for financial gain. Mitigation and Prevention. There are several ways customers can mitigate and prevent Nyetya from impacting your environment. First and foremost, we strongly recommend that customers who have NOT yet already applied MS1.