XLM Auto_Open environment-evasion close gate

OLE_XLM_ENVIRONMENT_EVASION_CLOSE

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critical OLE_XLM_ENVIRONMENT_EVASION_CLOSE

What it means

XLM Auto_Open macro runs host-environment checks before showing a fake error and closing.

Why it fires

Malicious Excel 4.0 macros often abort when the workbook appears to be opened in a sandbox, non-Windows host, or reduced UI environment. The detector requires an XLM macro sheet with Auto_Open plus multiple GET.WORKSPACE/GET.WINDOW checks and an ALERT()/CLOSE(FALSE) decoy such as a fake corrupted workbook message. That combination is intentionally narrow and is not normal spreadsheet automation.

Other Office heuristics

OLE_VBA_AFFINE_MSI_DOWNLOADER OLE_VBA_AUTOEXEC_FRAGMENTED_SHELL OLE_VBA_DESTRUCTIVE_WORKBOOK_SHUTDOWN OLE_VBA_BIDIRECTIONAL_MACROCOPY_REPLICATION OOXML_BRAND_LINK_MISMATCH_LURE CVE_2016_7262 POLYGLOT_OOXML_REL_COMMAND OLE_RAW_PCODE_CROSS_DOCUMENT_REPLICATION OLE_VBA_CROSS_WORKBOOK_REPLICATION OOXML_XLM_DANGEROUS_FN OFFICE_DEFAULT_PASSWORD_VBA_DROP_EXEC OFFICE_EMBEDDED_SWF EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE OFFICE_EMBEDDED_MACRO_OBJECT OLE_EMBEDDED_EXE OLE_VBA_EMBEDDED_PE_DROPPER OLE_ENCRYPTED_AND_MALFORMED CVE_2017_11882_EQUATION_NATIVE_CMD_RELATED CVE_2017_11882 OLE_EQUATION_OLE10NATIVE_DOWNLOADER OLE_MTEF_NATIVE_CODE_STUB OLE_EQUATION_OLE10NATIVE_SHELLCODE OOXML_XLM_MACRO_IN_WORKSHEET OLE_XLS5_LAROUX_MACRO_VIRUS