QiAnXin Threat Intelligence Center and Falcon Operations Team observed in their daily operations that in June 2024, several foreign counterparts reported in-the-wild attacks related to the new attack technique GrimResource.
QiAnXin Threat Intelligence Center and Falcon Operations Team promptly conducted research on this technique and have been continuously monitoring it. In mid-July 2024, they discovered the first attack incident in government and enterprise terminals, and the researchers classified the nature of the attack as black industry. The GrimResource technique exploits the XSS vulnerability in mmc system files to execute JS code and uses DotNetToJScript to load arbitrary .NET programs into memory. This not only bypasses ActiveX control warnings but also enables fileless payload execution.
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Source: QiAnXin Threat Intelligence Center/Falcon Operations Team
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