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<blockquote data-quote="Andy Ful" data-source="post: 974122" data-attributes="member: 32260"><p><strong><span style="font-size: 18px">SWH vs. BazarLoader/BazarBackdoor phishing campaign</span></strong></p><p><span style="font-size: 15px">[URL unfurl="true"]https://www.bleepingcomputer.com/news/security/malicious-csv-text-files-used-to-install-bazarbackdoor-malware/[/URL]</span></p><p></p><p>It is interesting how motivated can be the people to be fooled by this infection vector. The user can see two alerts:</p><p></p><p>[ATTACH]264003[/ATTACH]</p><p></p><p>Both alerts have default actions that can stop the attack. So, the user has to twice choose a non-default action to be infected. Anyway, some users still were infected. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite132" alt=":unsure:" title="Unsure :unsure:" loading="lazy" data-shortname=":unsure:" /></p><p></p><p><strong>The infection vector starts with email </strong>(delivery stage in blue):</p><p><strong><span style="color: rgb(41, 105, 176)">email with URL ---></span></strong><span style="color: rgb(41, 105, 176)"> <strong>.csv document downloaded from URL ---> user opens document ---> Excel (DDE, wmic.exe) ---> execute PS CmdLine ---> Download/execute another PS CmdLine ---></strong></span><span style="color: rgb(184, 49, 47)"><strong> Download/execute malicious DLL via RunDll32</strong></span></p><p></p><p>The attack vector via CSV files is blocked by default with SWH ver. 1.1.1.1. SWH ver. 2.0.0.0 can block such attacks in Recommended Settings (including the DocumentsAntiExploit tool).</p><p>The SWH ver. prior to 1.1.1.1 could block this attack only when the "Paranoid Extensions" were applied. If not, then the malware could bypass SWH settings despite the restrictions for PowerShell scripts (not used in the attack) and Constrained Language Mode (malware uses only simple functions).</p><p></p><p>So, how this attack can be prevented by the H_C_Hardening tools?</p><ul> <li data-xf-list-type="ul">ConfigureDefender HIGH settings - Wmic will be blocked by the ASR rule as a child process of Excel.</li> <li data-xf-list-type="ul">FirewallHardening - PowerShell will be prevented from accessing the CmdLine from a remote URL.</li> <li data-xf-list-type="ul">DocumentsAntiExploit tool - DDE alert will not be shown and Wmic execution will be prevented.</li> </ul><p><strong><span style="color: rgb(0, 168, 133)">Post updated to include the info related to SWH ver. 1.1.1.1</span></strong></p></blockquote><p></p>
[QUOTE="Andy Ful, post: 974122, member: 32260"] [B][SIZE=5]SWH vs. BazarLoader/BazarBackdoor phishing campaign[/SIZE][/B] [SIZE=4][URL unfurl="true"]https://www.bleepingcomputer.com/news/security/malicious-csv-text-files-used-to-install-bazarbackdoor-malware/[/URL][/SIZE] It is interesting how motivated can be the people to be fooled by this infection vector. The user can see two alerts: [ATTACH alt="1643840164675.png"]264003[/ATTACH] Both alerts have default actions that can stop the attack. So, the user has to twice choose a non-default action to be infected. Anyway, some users still were infected. :unsure: [B]The infection vector starts with email [/B](delivery stage in blue): [B][COLOR=rgb(41, 105, 176)]email with URL --->[/COLOR][/B][COLOR=rgb(41, 105, 176)] [B].csv document downloaded from URL ---> user opens document ---> Excel (DDE, wmic.exe) ---> execute PS CmdLine ---> Download/execute another PS CmdLine --->[/B][/COLOR][COLOR=rgb(184, 49, 47)][B] Download/execute malicious DLL via RunDll32[/B][/COLOR] The attack vector via CSV files is blocked by default with SWH ver. 1.1.1.1. SWH ver. 2.0.0.0 can block such attacks in Recommended Settings (including the DocumentsAntiExploit tool). The SWH ver. prior to 1.1.1.1 could block this attack only when the "Paranoid Extensions" were applied. If not, then the malware could bypass SWH settings despite the restrictions for PowerShell scripts (not used in the attack) and Constrained Language Mode (malware uses only simple functions). So, how this attack can be prevented by the H_C_Hardening tools? [LIST] [*]ConfigureDefender HIGH settings - Wmic will be blocked by the ASR rule as a child process of Excel. [*]FirewallHardening - PowerShell will be prevented from accessing the CmdLine from a remote URL. [*]DocumentsAntiExploit tool - DDE alert will not be shown and Wmic execution will be prevented. [/LIST] [B][COLOR=rgb(0, 168, 133)]Post updated to include the info related to SWH ver. 1.1.1.1[/COLOR][/B] [/QUOTE]
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