Masquerading: Использование символа RLO
Other sub-techniques of Masquerading (7)
Adversaries may abuse the right-to-left override (RTLO or RLO) character (U+202E) to disguise a string and/or file name to make it appear benign. RTLO is a non-printing Unicode character that causes the text that follows it to be displayed in reverse. For example, a Windows screensaver executable named March 25 \u202Excod.scr will display as March 25 rcs.docx. A JavaScript file named photo_high_re\u202Egnp.js will be displayed as photo_high_resj.png.(Citation: Infosecinstitute RTLO Technique)
Adversaries may abuse the RTLO character as a means of tricking a user into executing what they think is a benign file type. A common use of this technique is with Spearphishing Attachment/Malicious File since it can trick both end users and defenders if they are not aware of how their tools display and render the RTLO character. Use of the RTLO character has been seen in many targeted intrusion attempts and criminal activity.(Citation: Trend Micro PLEAD RTLO)(Citation: Kaspersky RTLO Cyber Crime) RTLO can be used in the Windows Registry as well, where regedit.exe displays the reversed characters but the command line tool reg.exe does not by default.
Примеры процедур |
|
| Название | Описание |
|---|---|
| Ferocious Kitten |
Ferocious Kitten has used right-to-left override to reverse executables’ names to make them appear to have different file extensions, rather than their real ones.(Citation: Kaspersky Ferocious Kitten Jun 2021) |
| BlackTech |
BlackTech has used right-to-left-override to obfuscate the filenames of malicious e-mail attachments.(Citation: TrendMicro BlackTech June 2017) |
| Ke3chang |
Ke3chang has used the right-to-left override character in spearphishing attachment names to trick targets into executing .scr and .exe files.(Citation: Mandiant Operation Ke3chang November 2014) |
| Scarlet Mimic |
Scarlet Mimic has used the left-to-right override character in self-extracting RAR archive spearphishing attachment file names.(Citation: Scarlet Mimic Jan 2016) |
| BRONZE BUTLER |
BRONZE BUTLER has used Right-to-Left Override to deceive victims into executing several strains of malware.(Citation: Trend Micro Tick November 2019) |
Обнаружение
Detection methods should include looking for common formats of RTLO characters within filenames such as \u202E, [U+202E], and %E2%80%AE. Defenders should also check their analysis tools to ensure they do not interpret the RTLO character and instead print the true name of the file containing it.
Ссылки
- Firsh, A.. (2018, February 13). Zero-day vulnerability in Telegram - Cybercriminals exploited Telegram flaw to launch multipurpose attacks. Retrieved April 22, 2019.
- Alintanahin, K.. (2014, May 23). PLEAD Targeted Attacks Against Taiwanese Government Agencies. Retrieved April 22, 2019.
- Security Ninja. (2015, April 16). Spoof Using Right to Left Override (RTLO) Technique. Retrieved April 22, 2019.
- Falcone, R. and Miller-Osborn, J.. (2016, January 24). Scarlet Mimic: Years-Long Espionage Campaign Targets Minority Activists. Retrieved February 10, 2016.
- Bermejo, L., et al. (2017, June 22). Following the Trail of BlackTech’s Cyber Espionage Campaigns. Retrieved May 5, 2020.
- GReAT. (2021, June 16). Ferocious Kitten: 6 Years of Covert Surveillance in Iran. Retrieved September 22, 2021.
- Villeneuve, N., Bennett, J. T., Moran, N., Haq, T., Scott, M., & Geers, K. (2014). OPERATION “KE3CHANG”: Targeted Attacks Against Ministries of Foreign Affairs. Retrieved November 12, 2014.
- Chen, J. et al. (2019, November). Operation ENDTRADE: TICK’s Multi-Stage Backdoors for Attacking Industries and Stealing Classified Data. Retrieved June 9, 2020.
Связанные риски
Каталоги
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