MALICIOUS
240
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open macro. Heuristics indicate it belongs to the legacy XLM macro-virus family, specifically XL4Poppy. The macro sheet contains formulas that execute dangerous APIs, including the RUN function, suggesting it's designed to download and execute a second-stage payload. The document body contains Vietnamese text related to a party invitation, likely a lure.
Heuristics 4
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Excel 4.0 (XLM) Auto_Open + macro sheet critical OLE_XLM_AUTOOPENWorkbook contains an Auto_Open / Auto_Close defined name together with an Excel 4.0 macro sheet — the canonical XLM auto-execution shape used by malware families such as Emotet and QakBot.
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
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XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FNExcel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
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Legacy XLM macro-virus family marker critical OLE_XLM_LEGACY_MACRO_VIRUSWorkbook contains an Excel 4.0 macro Auto_Open chain and legacy macro-virus family strings. This is a narrow indicator for infected XLM workbooks rather than ordinary formula use.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt09c28f99b357cf2af9853a5cc51587e524dbe1fdc85999b8fb4e202d1f18cb0a |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 158744 bytes |
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