Office (OLE) / .XLS malware analysis — malicious · a692a48f41233ee6

MALICIOUS

Office (OLE) / .XLS

41.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 9bc5d31bb3c5d021acc5e2da9b6cba94 SHA-1: 32518b9c94b4a8cbf93d642ccb37fc5f1cbe9f5e SHA-256: a692a48f41233ee6982a06ce2798b0c12bbf14fc304d08007872fd00e8067bd6

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.001 PowerShell

This XLS file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical indicator of malicious intent. The macros are designed to execute dangerous functions, including the RUN function, suggesting the file is intended to download and execute a second-stage payload. The presence of the Auto_Open defined name and the use of dangerous formula APIs strongly indicate a malicious macro-based attack.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools 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_FN

Excel 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_AUTOOPEN

Workbook 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.txt` `e94b8e447c4640213a77767ffc37e3db5d7b2782235cf8ddb7e5ef7e2f706e2e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	7752 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.