Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 7a572153d24eb8d9…

MALICIOUS

Office (OLE) / .XLS

111.0 KB Created: 2008-11-27 00:53:59 Authoring application: Microsoft Excel
MD5: 91c45af56444245ad23b06325a0e7335 SHA-1: b1afafe10ba2093db1e1392d6edead41a6735ecf SHA-256: 7a572153d24eb8d908881d0f5fc699db5c7618a07a56f248e9cfa9586c0b3e39
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The document body displays a deceptive message prompting the user to enable content, which would likely trigger the macro execution.

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.

FilenameKindSourceSize
xlm_macros.txt
47b738ef07518de2f0a2d3eda90e65902715b428cdae86499cb297dadefdd644		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 59398 bytes

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