MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The sample is identified as a malicious Excel 5 macro-virus, specifically the Laroux family, indicated by critical heuristic firings. The presence of 'laroux' and 'auto_open' markers suggests the macro executes automatically. The embedded OLE structure also shows suspicious findings, further supporting its malicious nature.
Heuristics 3
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Excel 5 Laroux/Larou-CV macro-virus marker cluster critical OLE_XLS5_LAROUX_MACRO_VIRUSLegacy Excel workbook contains a Laroux/Larou-CV macro-virus marker cluster including auto_open execution and workbook/module replication strings. This is a narrow indicator for an infected legacy Excel macro workbook.
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Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGEA CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
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CFB header with no readable streams medium OLE_PARSE_EMPTY_STREAMSThe file begins with a valid OLE2/CFB header but exposes no directory streams. A non-empty compound document with an unreadable directory is anomalous — it is seen with truncated/corrupt files and, more importantly, with content deliberately shifted off byte boundaries to defeat parsers while the host application still recovers the object.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
embedded_office_off0000661e.ole |
embedded-office | Embedded OLE/CFB Office body inside ole container at offset 0x661E | 5090 bytes |
SHA-256: 0b10584b57b492b6034bba21e32fc869b912fe2d6102cd129d2610e9d182f7e9 |
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