Office (OLE) / .XLS malware analysis — malicious · 31d22dc2d95d1581

MALICIOUS

Office (OLE) / .XLS

205.0 KB Created: 2020-02-27 10:23:09 Authoring application: Microsoft Excel

MD5: c0f6bef6b23a3c03c1a350d5f4ea5df5 SHA-1: 75dcd671c1aafb8bc879aacd58c36d2b91c46c60 SHA-256: 31d22dc2d95d1581210f46c52d21d22b04f660cc210160cafd38abd9fea0cc63

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The presence of the RUN function within the XLM macro sheet suggests the execution of arbitrary commands. While no specific URLs or hashes were extracted, the macro's ability to run commands points to a downloader or initial execution stage.

Heuristics 3

XLM Auto_Open with dangerous formula APIs high 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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/officeDocument/2006/customXml
- http://schemas.microsoft.com/DataMashup

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `6ec04487afbf7857f7a8f5ccb40dacf87b51da901c0df8e79c817d9f950b904e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	39856 bytes

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