시스코 탈로스는 사용자 자격 증명 및 기타 중요한 정보를 도용하기위한 악의적 인 캠페인을 논의. 그들은 에이전트 테슬라 infostealer가 특이한 점 적기을 한 것으로보고.티그는 맬웨어, 그의 공격은 월 시작, 감염된 시스템에서 합법적 인 프로세스에 해당 코드 바이 패스 안티 바이러스 보호 및 분사 원래의 부트 로더를 사용합니다. 페이로드는 에이전트 테슬라입니다, a well-known infostealer that can steal credentials from browsers, email clients, and FTP applications.
“The adversaries use custom droppers, which inject the final malware into common processes on the victim machine. Once infected, the malware can steal information from many popular pieces of software, including the Google Chrome, Safari and Firefox web browsers”, - 보고서 Cisco Talos specialists.
The uniqueness of the identified campaign lies in the methods used by cybercriminals to bypass security systems. The malware is delivered to the target device using a spam email, to which an archive with the ARJ extension is attached. The use of a popular packer in the 90s is dictated by the desire to make it difficult to detect malicious content – cybercriminals hope that email verification systems will not be able to process the outdated format.
The malware archive contains one executable file, which is an obfuscated Autoit script. After starting, it checks the presence of a virtual machine using a short list of processes and, if it is absent, extracts it in parts and generates a payload.
“The malware performs all operations in the device’s memory without leaving any traces on the hard disk, which makes it even more difficult to detect”, – say Cisco Talos researchers.
The installer code contains several functions that are not used in current attacks. 예를 들면, a script is able to download additional files from the Internet, as well as to work with the command line.
At the final stage of the installation, the malware decodes the shell code, which is encrypted using the RC4 stream algorithm, and selects one of the legitimate processes for introducing the payload. This is the obfuscated version of the Agent Tesla malware that can extract information from browsers and other software.
Infostealer is well known to information security specialists. Agent Tesla has been seen more than once during BEC campaigns. 작년, 그만큼 Gold Galleon group used targeted mailings and social engineering methods to deliver malware to shipping companies’ 컴퓨터. Targeted attacks using data theft programs allowed attackers to steal about $4 백만 from transport operators with a low level of information security in six months.