閉める
閉める
明日に向けたネットワーク
明日に向けたネットワーク
サポートするアプリケーションとユーザー向けに設計された、より高速で、より安全で、回復力のあるネットワークへの道を計画します。
          Netskopeを体験しませんか?
          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.
            SSEのリーダー。 現在、シングルベンダーSASEのリーダーです。
            SSEのリーダー。 現在、シングルベンダーSASEのリーダーです。
            Netskope、2024年Gartner®社のシングルベンダーSASEのマジック・クアドラントでリーダーの1社の位置付けと評価された理由をご確認ください。
              ダミーのためのジェネレーティブAIの保護
              ダミーのためのジェネレーティブAIの保護
              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
                最新の情報漏えい対策(DLP)for Dummies
                Get tips and tricks for transitioning to a cloud-delivered DLP.
                  SASEダミーのための最新のSD-WAN ブック
                  Modern SD-WAN for SASE Dummies
                  遊ぶのをやめる ネットワークアーキテクチャに追いつく
                    リスクがどこにあるかを理解する
                    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.
                        レガシーVPNを完全に置き換えるための6つの最も説得力のあるユースケース
                        レガシーVPNを完全に置き換えるための6つの最も説得力のあるユースケース
                        Netskope One Private Access is the only solution that allows you to retire your VPN for good.
                          Colgate-Palmoliveは、スマートで適応性のあるデータ保護により「知的財産」を保護します
                          Colgate-Palmoliveは、スマートで適応性のあるデータ保護により「知的財産」を保護します
                            Netskope GovCloud
                            NetskopeがFedRAMPの高認証を達成
                            政府機関の変革を加速するには、Netskope GovCloud を選択してください。
                              Let's Do Great Things Together
                              Netskopeのパートナー中心の市場開拓戦略により、パートナーは企業のセキュリティを変革しながら、成長と収益性を最大化できます。
                                Netskopeソリューション
                                Netskope Cloud Exchange
                                Netskope Cloud Exchange (CE) provides customers with powerful integration tools to leverage investments across their security posture.
                                  Netskopeテクニカルサポート
                                  Netskopeテクニカルサポート
                                  クラウドセキュリティ、ネットワーキング、仮想化、コンテンツ配信、ソフトウェア開発など、多様なバックグラウンドを持つ全世界にいる有資格のサポートエンジニアが、タイムリーで質の高い技術支援を行っています。
                                    Netskopeの動画
                                    Netskopeトレーニング
                                    Netskopeのトレーニングは、クラウドセキュリティのエキスパートになるためのステップアップに活用できます。Netskopeは、お客様のデジタルトランスフォーメーションの取り組みにおける安全確保、そしてクラウド、Web、プライベートアプリケーションを最大限に活用するためのお手伝いをいたします。

                                      Netskope Threat Labs Stats for February 2023

                                      Mar 21 2023

                                      Netskope Threat Labs publishes a monthly summary blog post of the top threats we are tracking on the Netskope platform. The purpose of this post is to provide strategic, actionable intelligence on active threats against enterprise users worldwide.

                                      Summary

                                      • Attackers continue to attempt to fly under the radar by using cloud apps to deliver malware, with 61% of all malware downloads in February originating from 161 cloud apps, both six-month highs.
                                      • Malicious plain text files, especially malicious LNK and PowerShell files, are on the rise and accounted for 12% of malware downloads in February, a six-month high.
                                      • Trojans continue to represent the majority of malware downloads, used to deliver payloads such as the infostealers AgentTesla and ClipBanker, and the backdoors Zusy and Farfli.

                                      Cloud Malware Delivery

                                      Attackers attempt to fly under the radar by delivering malicious content via popular cloud apps. Abusing cloud apps for malware delivery enables attackers to evade security controls that rely primarily on domain block lists and URL filtering, or that do not inspect cloud traffic. In February 2023, 61% of all HTTP/HTTPS malware downloads originated from popular cloud apps, increasing for the fourth consecutive month.

                                      Bar graph of malware delivery for cloud vs. web

                                      The increase in cloud malware downloads is driven partially by an increase in the number of distinct cloud apps from which malware are being downloaded. In February 2023, Netskope detected malware downloads from 161 distinct cloud apps, increasing for the second consecutive month.

                                      Bar graph showing number of apps with malware downloads

                                      Attackers achieve the most success reaching enterprise users when they abuse cloud apps that are already popular in the enterprise. Microsoft OneDrive, the most popular enterprise cloud app, has held the top spot for the most cloud malware downloads for more than six months. The other top apps for malware downloads include collaboration apps (Sharepoint), cloud storage apps (Amazon S3, Box, Azure Blob Storage, Google Drive, DropBox), free web hosting services (Weebly), and free software hosting sites (GitHub, SourceForge).

                                      Microsoft Sharepoint continues an upward trajectory, hitting a six-month high of 16% in February. The top ten apps accounted for 78% of cloud malware downloads in February, also a six-month high. While the number of apps with malware downloads continues to increase, the downloads are becoming increasingly concentrated in the most popular apps. For the first time in six months, no webmail apps appeared in the top ten list. The top ten list is a reflection of attacker tactics, user behavior, and company policy.

                                      Graph showing top apps for malware downloads in February 2023
                                      Line graph showing the six-month trend of top apps for malware downloads

                                      Top Malware File Types

                                      By file type, Microsoft Windows Portable Executable files (EXE/DLL) accounted for the plurality of malware downloads in February, as they have for at least the past six months. Delivering malware in archive files, particularly ZIP files, had been gradually increasing but appears to have plateaued in February. PDF files have been exhibiting the opposite trend, gradually decreasing and hitting a six-month low in February. Malicious Plain Text files, particularly malicious PowerShell scripts and LNK files, hit a six-month high in February. The popularity of other file types remains largely unchanged, as attackers continue to use a wide variety of file types to target their victims.

                                      Graph showing top malware file types in February 2023
                                      Line graph showing six-month trend for malware file types

                                      Top Malware Families

                                      Attackers are constantly creating new malware families and new variants of existing families, either as an attempt to bypass security solutions or to update their malware’s capabilities. In February 2023, 67% of all malware downloads detected by Netskope were either new families or new variants that had not been observed in the preceding six months. The other 33% were samples that had been previously observed during the preceding six months and are still circulating in the wild.

                                      By volume, Netskope blocks more Trojans than any other malware type. Trojans are commonly used by attackers to gain an initial foothold and to deliver other types of malware, such as infostealers, Remote Access Trojans (RATs), backdoors, and ransomware. Other top malware types include phishing lures (typically PDF files designed to lure victims into phishing scams), infostealers whose primary purpose is stealing information (especially passwords, tokens, and cookies), backdoors that provide clandestine remote access, and file-based exploits.

                                      Bar graph showing top malware types for February 2023

                                      The following list contains the top malware and ransomware families blocked by Netskope in February 2023:

                                      • Backdoor.Farfli (a.k.a Gh0st RAT, PCRat) is an old remote access tool associated with multiple APT groups that continues to be modified by APT groups for use in new attacks. Details
                                      • Backdoor.Zusy (a.k.a. TinyBanker) is a banking Trojan based on the source code of Zeus, aiming to steal personal information via code injection into websites. Details
                                      • Infostealer.AgentTesla is a .NET-based Remote Access Trojan with many capabilities, such as stealing browsers’ passwords, capturing keystrokes, clipboard, etc. Details
                                      • Infostealer.ClipBanker is an infostealer that steals banking information among other data and is typically spread via emails and social media Details
                                      • Infostealer.Fareit (a.k.a Siplog, Pony) is both an infostealer and botnet, stealing credentials from VPNs, browsers, and more. Details
                                      • Phishing.PhishingX is a malicious PDF file used as part of a phishing campaign to redirect victims to a phishing page.
                                      • Ransomware.DarkBit is a ransomware variant first discovered in early 2023 targeting organizations in Israel. Details
                                      • Trojan.Razy is a Trojan typically distributed via malicious ads disguised as legitimate software, often used to steal cryptocurrency data. Details
                                      • Trojan.Ursnif (a.k.a. Gozi) is a banking Trojan and backdoor, which had its source code leaked on GitHub in 2005, allowing attackers to create and distribute many variants. Details
                                      • Trojan.Valyria (a.k.a. POWERSTATS) is a family of malicious Microsoft Office Documents that contain embedded malicious VBScripts usually to deliver other malicious payloads. Details

                                      Recommendations

                                      Attackers have always sought to evade detection and avoid suspicion in delivering malware. Two strategies that attackers have been using increasingly in the past six months are to deliver malware by abusing cloud apps and to package malware in ZIP files. Netskope Threat Labs recommends that you review your security posture to ensure that you are adequately protected against both of these trends:

                                      • Inspect all HTTP and HTTPS downloads, including all web and cloud traffic, to prevent malware from infiltrating your network. Netskope customers can configure their Netskope NG-SWG with a Threat Protection policy that applies to downloads from all categories and applies to all file types.
                                      • Ensure that your security controls recursively inspect the content of popular archive files such as ZIP files for malicious content. Netskope Advanced Threat Protection recursively inspects the content of archives, including ISO, TAR, RAR, 7Z, and ZIP.
                                      • Ensure that high-risk file types like executables and archives are thoroughly inspected using a combination of static and dynamic analysis before being downloaded. Netskope Advanced Threat Protection customers can use a Patient Zero Prevention Policy to hold downloads until they have been fully inspected.
                                      • Configure policies to block downloads from apps that are not used in your organization to reduce your risk surface to only those apps and instances that are necessary for the business.
                                      • Block downloads of all risky file types from newly registered domains and newly observed domains.

                                      In addition to recommendations above, Remote Browser Isolation (RBI) technology can provide additional protection when there is a need to visit websites that fall in categories that can present higher risk, like Newly Observed and Newly Registered Domains.

                                      About This Report

                                      Netskope provides threat and data protection to millions of users worldwide. Information presented in this report is based on anonymized usage data collected by the Netskope Security Cloud platform relating to a subset of Netskope customers with prior authorization. This report contains information about detections raised by Netskope’s Next Generation Secure Web Gateway (SWG), not considering the significance of the impact of each individual threat. Stats in this report are based on the period starting August 1, 2022 through February 28, 2023. Stats are reflection of attacker tactics, user behavior, and organization policy.

                                      author image
                                      Ray Canzanese
                                      Ray is the Director of Netskope Threat Labs, which specializes in cloud-focused threat research. His background is in software anti-tamper, malware detection and classification, cloud security, sequential detection, and machine learning.
                                      Ray is the Director of Netskope Threat Labs, which specializes in cloud-focused threat research. His background is in software anti-tamper, malware detection and classification, cloud security, sequential detection, and machine learning.

                                      Stay informed!

                                      Subscribe for the latest from the Netskope Blog