MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1059.001 PowerShell
The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is designed to execute dangerous functions, including the RUN function, which allows for arbitrary command execution. The presence of the Auto_Open entry and the use of dangerous functions strongly indicate malicious intent, likely to download and execute a secondary payload. No specific family could be identified, but the technique is common for initial access.
Heuristics 3
-
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.
-
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.
-
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txtf7728cfe89ddf2b3c69fe71ff6977c540fcf56e7548cce556619ef5301cec309 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 6607 bytes |
Open this report in the interactive analyzer, or submit your own file for analysis.