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Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system. Adversaries may use the information from File and Directory Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
admin@338 actors used the following commands after exploiting a machine with LOWBALL malware to obtain information about files and directories: dir c:\ >> %temp%\download dir "c:\Documents and Settings" >> %temp%\download dir "c:\Program Files\" >> %temp%\download dir d:\ >> %temp%\download[5]
Backdoor.Oldrea collects information about available drives, default browser, desktop file list, My Documents, Internet history, program files, and root of available drives. It also searches for ICS-related software files.[32]
DustySky scans the victim for files that contain certain keywords and document types including PDF, DOC, DOCX, XLS, and XLSX, from a list that is obtained from the C2 as a text file. It can also identify logical drives for the infected machine.[102][103]
Gamaredon Group macros can scan for Microsoft Word and Excel files to inject with additional malicious macros. Gamaredon Group has also used its backdoors to automatically list interesting files (such as Office documents) found on a system.[122][123]
GeminiDuke collects information from the victim, including installed drivers, programs previously executed by users, programs and services configured to automatically run at startup, files and folders present in any user's home folder, files and folders present in any user's My Documents, programs installed to the Program Files folder, and recently accessed files, folders, and programs.[125]
Several Lazarus Group has conducted word searches on compromised machines to identify specific documents of interest. Lazarus Group malware can use a common function to identify target files by their extension, and some also enumerate files and directories, including a Destover-like variant that lists files and gathers information for all drives.[163][164][165][166][167]
NETEAGLE allows adversaries to enumerate and modify the infected host's file system. It supports searching for directories, creating directories, listing directory contents, reading and writing to files, retrieving file attributes, and retrieving volume information.[33]
Rising Sun can enumerate information about files from the infected system, including file size, attributes, creation time, last access time, and write time. Rising Sun can enumerate the compilation timestamp of Windows executable files.[243]
Turla surveys a system upon check-in to discover files in specific locations on the hard disk %TEMP% directory, the current user's desktop, the Program Files directory, and Recent.[109][288] Turla RPC backdoors have also searched for files matching the lPH*.dll pattern.[289]
WannaCry searches for variety of user files by file extension before encrypting them using RSA and AES, including Office, PDF, image, audio, video, source code, archive/compression format, and key and certificate files.[295][296]
Zebrocy searches for files that are 60mb and less and contain the following extensions: .doc, .docx, .xls, .xlsx, .ppt, .pptx, .exe, .zip, and .rar. Zebrocy also runs the echo %APPDATA% command to list the contents of the directory.[312][313][314] Zebrocy can obtain the current execution path as well as perform drive enumeration.[315][316]
Monitor executed commands and arguments that may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system. For network devices, monitor executed commands in AAA logs, especially those run by unexpected or unauthorized users.
Audio Data is very similar to graphics data in that it is understood in pieces. Instead of using pixels, however, audio data uses samples. Audio data is usually recorded with an input device such as a microphone or a MIDI controller. Samples are then taken from the recording thousands of times every second and when they are played back in the same order, they create the original audio file. Because there are so many samples within each sound file, files are often compressed into formats such as MP3 or MP4 so that they take up less storage space. This makes them easier to download, send over the internet, or even store on your MP3 player.
Video data is also similar to graphic and audio data, but instead of using pixels or samples, video data is recorded with the use of frames. Frames are still images that are taken numerous times per second and that when played simultaneously, create a video (most films are recorded using twenty-four frames per second).[7] Similar to audio data, because video data contains so much information, the files can be compressed, making it possible for full length movies containing thousands of frames to be stored on optical discs.
Since solid-state drives (SSDs) are hard drives that use flash memory technology instead of hard disk platters they have no moving parts. They also no longer make noise, consume less power thus generating less heat, and are much faster than hard drives. Since they are much faster than hard drives, the performance of the computer would also be improved. Running programs, opening files, saving things to the disk, even browsing the web will be much faster. Also with a mechanical hard drive, physical heads have to move around to read data from the disk while in a solid-state drive data can be read and written on any location thus there is no penalty in performance. Not only are solid-state drives faster but they have also become less expensive that upgrading to them is much more affordable and reasonable. Even further, installing solid-state drives is not too difficult or complex. It is basically the same as installing regular hard drives. Also if the decision of upgrading to solid-state drives seems a little too final, it is possible to just add a solid-state drive alongside the hard drive. Thus not only having more space, but also having the ability to keep the old mechanical drive.[29]
Temporary files (e.g. from web browsers and installation programs) can take up valuable storage space if they are not removed after extended periods of times. Also, users should be aware of the programs they are installing and decide which specific programs are to run at startup. Too many programs can slow down the initial startup time of the computer because it must launch program after program. Only those programs that are necessary should be included, and to check for this, click Start (in the lower-left Windows icon) and enter the command msconfig in the search tab. This will open the System Configuration window. Programs that run at startup are listed under the Startup tab. Here the user can enable or disable programs, which can affect startup time.
Another important factor in determining system performance is the corruption of system files by malware. Viruses, worms, trojans, spyware, and other forms of malware can infect a system by various means, so it is important for the user to be aware and defensive. Anti-virus programs and other security software provide protection from malware, so it is recommended that a user has some sort of program installed and regularly scans the system for any traces.
As the demand for technology and technology itself continues to excel throughout history, so does user's wants and needs. The user's lifestyle pertaining to computers may revolve around publishing documents, creating presentations, media management, networking on the internet, and much more. In correlation with their wants and needs, there's the need to be able to have access to storage of the data being produced. Storage is also referred to as 'memory', as it can be any type of hardware that's functionality includes, storing data, maintaining downloaded files along with extracting files as well. This can be performed through both permanent and temporary storage along with being internal to a device, or external.
Hard drives are used as primary storage units to store most data and computer programs to operate on a computer. The two types of hard drives available for purchase are: internal hard drives, and external hard drives. There are many things to consider if you are a consumer seeking these storage devices. The internal hard drive, which can be included in the computer before purchase, is directly connected to the motherboard, (A.K.A the brain of the computer), as well as other components inside the tower or casing of the computer/laptop. An external hard drive is commonly used among users who are either portably transporting data/programs from device to device, or seeking extra storage space for their files. External hard drives can be very small, and convenient for traveling with data. There are multiple different options to explore while considering a hard drive: speed, consistency, and durability. The types of hard drives offered include either of the following: magnetic storage, optical storage, and electrons which use flash memory media.[6]
Cloud storage, also referred to as "The Cloud", is simply the use of a remote storage device that is accessed by means of the internet. Cloud storage has seen a massive increase in popularity over the last few years, and the industry for it has grown substantially to the point where there are now hundreds of companies that offer a variety of cloud storage services. More specifically, some cloud services focus only on digital pictures or email messages, while other systems store all kinds of digital data. Some services, like Google Drive, allow users to save their files in one of many massive data centers Google operates where, for instance, multiple users can collaborate on projects by having access to the same file.[10]
USB drives are the perfect devices for transporting data and files. They are easy to use and their portability makes them incredibly convenient. In addition to storing files, they can also be used to run portable apps. Certain applications can be turned into portable versions of themselves. You can have access to various software applications to use on any computer. Free programs exist to convert applications to portable ones to, in essence, create a portable PC on a thumb drive. USB drives range in storage capacity from 2 GB to 4 TB. With 4 TB of storage in such a portable size, the limits to their use are virtually endless. 2b1af7f3a8