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If the user does enable macros, they save and run a binary file that downloads the actual encryption Trojan, which will encrypt all files that match particular extensions. Filenames are converted to a unique 16 letter and number combination. Initially, only the .locky file extension was used for these encrypted files.
The file is a text file of between 68 and 128 bytes [6] that is a legitimate .com executable file (plain x86 machine code) that can be run by MS-DOS, some work-alikes, and its successors OS/2 and Windows (except for 64-bit due to 16-bit limitations). The EICAR test file will print "EICAR-STANDARD-ANTIVIRUS-TEST-FILE!" when executed and then ...
On the local system, the WannaCry executable file extracts and installs binary and configuration files from its resource section. It also hides the extracted directory, modifies security descriptors, creates an encryption key, deletes shadow copies, and so on.
Static malware analysis: Static or Code Analysis is usually performed by dissecting the different resources of the binary file without executing it and studying each component. The binary file can also be disassembled (or reverse engineered) using a disassembler such as IDA or Ghidra. The machine code can sometimes be translated into assembly ...
The malicious mechanism consists of two compressed test files that contain the malicious binary code. These files are available in the git repository, but remain dormant unless extracted and injected into the program. [4] The code uses the glibc IFUNC mechanism to replace an existing function in OpenSSH called RSA_public_decrypt with a ...
It loops through code hundreds of millions of times to delay execution, and checks for file names and user names used by Malware Analysis Sandboxes. If Rombertik detects a modification in the compile time or binary resource in memory, it attempts to overwrite the Master Boot Record (MBR) on the primary hard drive. [2]
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