fermer
fermer
Le réseau de demain
Le réseau de demain
Planifiez votre chemin vers un réseau plus rapide, plus sûr et plus résilient, conçu pour les applications et les utilisateurs que vous prenez en charge.
          Essayez Netskope
          Get Hands-on With the Netskope Platform
          Here's your chance to experience the Netskope One single-cloud platform first-hand. Sign up for self-paced, hands-on labs, join us for monthly live product demos, take a free test drive of Netskope Private Access, or join us for a live, instructor-led workshops.
            Un leader sur SSE. Désormais leader en matière de SASE à fournisseur unique.
            Un leader sur SSE. Désormais leader en matière de SASE à fournisseur unique.
            Netskope fait ses débuts en tant que leader dans le Magic Quadrant™ de Gartner® pour le SASE à fournisseur unique.
              Sécuriser l’IA générative pour les nuls
              Sécuriser l’IA générative pour les nuls
              Learn how your organization can balance the innovative potential of generative AI with robust data security practices.
                Modern data loss prevention (DLP) for Dummies eBook
                La prévention moderne des pertes de données (DLP) pour les Nuls
                Get tips and tricks for transitioning to a cloud-delivered DLP.
                  Réseau SD-WAN moderne avec SASE pour les nuls
                  Modern SD-WAN for SASE Dummies
                  Cessez de rattraper votre retard en matière d'architecture de réseau
                    Identification des risques
                    Advanced Analytics transforms the way security operations teams apply data-driven insights to implement better policies. With Advanced Analytics, you can identify trends, zero in on areas of concern and use the data to take action.
                        Les 6 cas d'utilisation les plus convaincants pour le remplacement complet des anciens VPN
                        Les 6 cas d'utilisation les plus convaincants pour le remplacement complet des anciens VPN
                        Netskope One Private Access is the only solution that allows you to retire your VPN for good.
                          Colgate-Palmolive protège sa "propriété intellectuelle" "grâce à une protection des données intelligente et adaptable
                          Colgate-Palmolive protège sa "propriété intellectuelle" "grâce à une protection des données intelligente et adaptable
                            Netskope GovCloud
                            Netskope obtient l'autorisation FedRAMP High Authorization
                            Choisissez Netskope GovCloud pour accélérer la transformation de votre agence.
                              Let's Do Great Things Together
                              La stratégie de commercialisation de Netskope privilégie ses partenaires, ce qui leur permet de maximiser leur croissance et leur rentabilité, tout en transformant la sécurité des entreprises.
                                Solutions Netskope
                                Netskope Cloud Exchange
                                Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.
                                  Support technique de Netskope
                                  Support technique de Netskope
                                  Nos ingénieurs d'assistance qualifiés sont répartis dans le monde entier et possèdent des expériences diverses dans les domaines de la sécurité du cloud, des réseaux, de la virtualisation, de la diffusion de contenu et du développement de logiciels, afin de garantir une assistance technique rapide et de qualité
                                    Vidéo Netskope
                                    Formation Netskope
                                    Grâce à Netskope, devenez un expert de la sécurité du cloud. Nous sommes là pour vous aider à achever votre transformation digitale en toute sécurité, pour que vous puissiez profiter pleinement de vos applications cloud, Web et privées.

                                      Netskope Threat Coverage: Night Sky

                                      Jan 11 2022

                                      Summary

                                      Naming themselves Night Sky, a new ransomware family was spotted on the first day of 2022, by the MalwareHunterTeam. They appear to work in the RaaS (Ransomware-as-a-Service) model, similar to other ransomware groups like REvil, LockBit, and Hive, publishing stolen data exfiltrated throughout the attack in a deep web site if the ransom is not paid by the victim.

                                      Example of Night Sky ransomware message in their deep web site.
                                      Night Sky ransomware message in their deep web site.

                                      Currently, there are two companies listed on their deep web site, where the group has published the victim’s allegedly stolen data.

                                      Screenshot of the two victim’s listed on the Night Sky website.
                                      Two victim’s listed on the Night Sky website.

                                      Night Sky publishes a list of everything they claim to have stolen.

                                      Screenshot of list of allegedly stolen data by Night Sky group.
                                      List of allegedly stolen data by Night Sky group.

                                      Aside from this list, there are also screenshots of the stolen files and data. The group demands the victim to contact them within a week after the attack, claiming that the contact website will be disabled after this period, eliminating the chances of recovery through payment.

                                      Screenshot of Night Sky’s details on their website.
                                      Night Sky’s details on their website.

                                      Researchers have found that the Night Sky ransomware group was using the Log4Shell vulnerability (CVE-2021-44228) to successfully infect their targets as early as January 4, 2022. It’s not the first time a ransomware family has been found utilizing this vulnerability either, as Khonsari was using it in December 2021.

                                      Furthermore, similarities between Night Sky and Rook ransomware were found by comparing their binaries, containing only a few differences in the encryption algorithm. However, at this point it’s unclear if this is the same threat group or a code reuse.

                                      Threat

                                      Only two samples of Night Sky were found in the wild so far, being both 64-bit executables using VMProtect software, which adds a strong protection against analysis and reverse engineering.

                                      Example of Night Sky using VMProtect.
                                      Night Sky using VMProtect.

                                      Before encrypting the files, Night Sky uses a hardcoded mutex to verify if another instance of the ransomware is already running.

                                      Example of Night Sky checking / creating the mutex.
                                      Night Sky checking / creating the mutex.

                                      We created a small code that creates the same mutex and we confirmed that the ransomware skips the encryption if the object already exists. 

                                      Once running, Night Sky starts listing all directories, skipping the following folders and files:

                                      • #recycle
                                      • $Recycle.Bin
                                      • All Users
                                      • AppData
                                      • autorun.inf
                                      • Boot
                                      • boot.ini
                                      • bootfont.bin
                                      • bootmgfw.efi
                                      • bootmgr
                                      • bootmgr.efi
                                      • bootsect.bak
                                      • desktop.ini
                                      • Google
                                      • iconcache.db
                                      • Internet Explorer
                                      • Mozilla
                                      • Mozilla Firefox
                                      • ntldr
                                      • ntuser.dat
                                      • ntuser.dat.log
                                      • ntuser.ini
                                      • Opera
                                      • Opera Software
                                      • Program Files
                                      • Program Files (x86)
                                      • ProgramData
                                      • thumbs.db
                                      • Tor Browser
                                      • Windows
                                      • Windows.old
                                      Screenshot of list of folders and files Night Sky skips the encryption
                                      List of folders and files Night Sky skips the encryption.

                                      NightSky also skips files with the extensions “.exe”, “.dll”, and “.nightsky”.

                                      Screenshot of Night Sky won’t encrypt files with these extensions.
                                      Night Sky won’t encrypt files with these extensions.

                                      If the file doesn’t match the criteria above, Night Sky adds the “.nightsky” extension and starts the encryption routine.

                                      Example of ransomware adding the “.nightsky” extension to encrypted files.
                                      Ransomware adding the “.nightsky” extension to encrypted files.

                                      Night Sky uses the Mbed TLS library functions during the encryption.

                                      Screenshot of Mbed TLS library found in Night Sky Ransomware.
                                      Mbed TLS library found in Night Sky Ransomware.

                                      Throughout the encryption process, Night Sky uses a combination of AES-128-CBC for file encryption, and a combination of RSA to encrypt the keys, which is appended to the file. This page contains more detailed information about Night Sky encryption processes, as well as similarities between Rook ransomware.

                                      Example of Night Sky attacker’s public RSA (2048 bit) key used in the encryption process
                                      Night Sky attacker’s public RSA (2048 bit) key used in the encryption process

                                      The ransomware creates the ransom note in HTA format in every single directory, named “NightSkyReadMe.hta”.

                                      Screenshot of Night Sky encrypted files along with the ransom note.
                                      Night Sky encrypted files along with the ransom note.

                                      The ransom note contains some of the information that is also published on the deep web site, along with the URL and contact information.

                                      Example of Night Sky ransom note.
                                      Night Sky ransom note.

                                      Protection

                                      Netskope Threat Labs is actively monitoring this campaign and has ensured coverage for all known threat indicators and payloads. 

                                      • Netskope Threat Protection
                                        • Win64.Ransomware.NightSky
                                      • Netskope Advanced Threat Protection provides proactive coverage against this threat.
                                        • Gen.Malware.Detect.By.StHeur indicates a sample that was detected using static analysis
                                        • Gen.Malware.Detect.By.Sandbox indicates a sample that was detected by our cloud sandbox

                                      IOCs

                                      A full list of IOCs and a Yara rule are all available in our Git repo.

                                      author image
                                      Gustavo Palazolo
                                      Gustavo Palazolo is an expert in malware analysis, reverse engineering and security research, working many years in projects related to electronic fraud protection.
                                      Gustavo Palazolo is an expert in malware analysis, reverse engineering and security research, working many years in projects related to electronic fraud protection.

                                      Restez informé !

                                      Abonnez-vous pour recevoir les dernières nouvelles du blog de Netskope