Office (OLE) / .XLS malware analysis — malicious · 3d63a03b43b3325c

MALICIOUS

Office (OLE) / .XLS

41.5 KB Created: 2020-11-13 11:00:09 Authoring application: Microsoft Excel

MD5: 9f6dbf4a8872376eb579cfa419eb1b7c SHA-1: 5ad5cc43943231f272bb689e6595566bfe4b0a27 SHA-256: 3d63a03b43b3325c9628b6c3e6afcbf80f735a47e33fd326659edb3bda344fd6

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical heuristic firings indicate the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open defined name that utilizes dangerous formula APIs like RUN. This suggests the macro is designed to execute arbitrary commands upon opening the spreadsheet. While the specific command or payload is not directly visible due to truncation, the presence of the RUN function points to a downloader or initial execution stage.

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` `f9e83d5707492b85e193b49265effa6dde8047de3a0fbfa61e026ad5267981bf`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	9457 bytes

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