One Article Review
| Source |  Fortinet ThreatSignal |
|---|---|
| Identifiant | 5595941 |
| Date de publication | 2022-07-07 08:10:19 (vue: 2022-07-07 16:05:31) |
| Titre | Alert (AA22-181A) #StopRansomware: MedusaLocker |
| Texte | FortiGuard Labs is aware that a joint Cybersecurity Advisory (CSA) on MedusaLocker ransomware was released by the Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Security Agency (CISA), the Department of the Treasury, and the Financial Crimes Enforcement Network (FinCEN). MedusaLocker infection typically occurs through Remote Desktop Protocol (RDP) compromise, propagates MedusaLocker throughout the network, and uses AES-256 encryption to encrypt files.Why is this Significant?This is significant as the joint Cybersecurity Advisory (CSA) is the latest #StopRansomware advisory released by the Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Security Agency (CISA), the Department of the Treasury, and the Financial Crimes Enforcement Network (FinCEN), which provides observed tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to help organizations protect against ransomware.What is MedusaLocker Ransomware?MedusaLocker is a ransomware that encrypts files in the compromised machines with the AES-256 encryption algorithm and demands victims to pay a ransom in order to recover the affected files. According to the advisory, MedusaLocker primarily takes advantage of an insecure RDP configuration as an initial infection vector, however email spam and malicious attachments are also used.The advisory also states that MedusaLocker ransomware uses multiple infection processes:Uses a batch file to execute PowerShell script, which propagates the ransomware throughout the network. Restarts the LanmanWorkstation service, which allows registry edits to take effect. Kills the processes belonging to well-known security, accounting, and forensic software. Restarts the machine in safe mode.Encrypts files in the compromised machines with the AES-256 encryption algorithmRuns every 60 seconds, encrypting all files except those critical to the functionality of the victim's machine and those that have the designated encrypted file extension. Establishes persistence by copying an executable (svhost.exe or svhostt.exe) to the %APPDATA%\Roaming directory and scheduling a task to run the ransomware every 15 minutes. Attempts to prevent standard recovery techniques by deleting local backups, disabling startup recovery options, and deleting shadow copies.Leaves a ransom note into every folder containing instruction on how to reach out to the attacker either via MedusaLocker's Tor sites or emails.The following is a list of known file extensions that MedusaLocker adds to the encrypts files:.1btc.bec.cn.datalock.deadfilesgr.decrypme.encrypted.faratak.FartingGiraffeAttacks.fileslock.fileslocked.jpz.nz.key1.lock.lockdata7.lockfiles.lockfilesUS.marlock01.marlock02.marlock08.marlock11.marlock13.marlock25.marlock6.marlock011.matlock20.mylock.newware.NET1.NZ.perfection.Readinstruction.READINSTRUCTION.ReadInstructions.readinstructions.rs.skynet.stopflies.tyco.tyco.uslockhh.uslockhh.zoomzoomn.exent_lock20.networkmaze.VinDizelPux.EG.support.deadfiles.readtheinstructions.lr.divsouth.lockfilesCO.lockfilesKR.EMPg296LCKThe following is a list of known MedusaLocker's ransom notes:! _HOW_RECOVERY_FILES _!. HTML!!!HOW_TO_DECRYPT!!!how_to_ recover_data.html HOW_TO_OPEN_FILES.htmlHOW_TO_RECOVER_DATA.htmlhow_to_recover_data.html.marlock01How_to_recovery.txtinstructions.html READINSTRUCTION.html readinstructions.html readme_to_recover_filesrecovery_instruction.htmlrecovery_instructions.html What is the Status of Coverage?FortiGuard Labs provides the following AV coverage against known samples of MedusaLocker ransomware:W32/MedusaLocker.0FEB!trW32/MedusaLocker.9106!tr.ransomW32/MedusaLocker.C!tr.ransomW32/Ransom_Win32_MEDUSALOCKER.SMTHW32/Ransom_Win32_MEDUSALOCKER.SMTH!trW32/Ransom_Win32_MEDUSALOCKER.SMTH!tr.ransomW32/DelShad.BMQ!tr.ransomW32/Filecoder.FV!trW32/Filecoder.NSF!tr.ransomW32/Filecoder.NYA!tr.ransomW32/Generic.AC.171!trW32/Generik.DGWKQJO!trW32/Kryptik.HFBI!trW32/PossibleThreatW32/Ransomware.GUN!trW32/Zudochka.VHO!tr.ransomW64/Filecoder.DF!tr.ransomPossibleThreat.FAIRiskware/DelShad |
| Envoyé | Oui |
| Condensat | #stopransomware #stopransomware: 0feb 171 181a 1btc 256 9106 aa22 according accounting adds advantage advisory aes affected against agency alert algorithm algorithmruns all allows also appdata are attachments attacker attempts aware backups batch bec belonging bmq bureau cisa compromise compromised configuration containing copies copying coverage crimes critical csa cybersecurity data datalock deadfiles deadfilesgr decrypme decrypt deleting demands department designated desktop dgwkqjo directory disabling divsouth edits effect either email emails empg296lckthe encrypt encrypted encrypting encryption encrypts enforcement establishes every except exe executable execute exent extension extensions fairiskware/delshad faratak fartinggiraffeattacks fbi federal file files files: fileslock fileslocked filesrecovery financial fincen folder following forensic fortiguard functionality gun have help hfbi how however html htmlhow htmlrecovery indicators infection infrastructure initial insecure instruction instructions investigation iocs joint jpz key1 kills known labs lanmanworkstation latest leaves list local lock lock20 lockdata7 lockfiles lockfilesco lockfileskr lockfilesus machine machines malicious marlock01 marlock011 marlock01how marlock02 marlock08 marlock11 marlock13 marlock25 marlock6 matlock20 medusalocker minutes mode multiple mylock net1 network networkmaze newware note notes: nsf nya observed occurs open options order organizations out pay perfection persistence powershell prevent primarily procedures processes processes:uses propagates protect protocol provides ransom ransompossiblethreat ransomw32/delshad ransomw32/filecoder ransomw32/generic ransomw32/medusalocker ransomw32/ransom ransomw64/filecoder ransomware ransomware:w32/medusalocker rdp reach readinstruction readinstructions readme readtheinstructions recover recovery registry released remote restarts roaming run safe samples scheduling script seconds security service shadow significant sites skynet smth smthw32/ransom software spam standard startup states status stopflies support svhost svhostt tactics take takes task techniques those through throughout tor treasury trw32/filecoder trw32/generik trw32/kryptik trw32/medusalocker trw32/possiblethreatw32/ransomware trw32/ransom trw32/zudochka ttps txtinstructions tyco typically used uses uslockhh vector vho victim victims vindizelpux well what which why win32 zoomzoomn |
| Tags | Ransomware Spam |
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