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

Static analysis result for SHA-256 155d8f8b492c78b2…

MALICIOUS

Office (OLE) / .XLS

260.0 KB Created: 2020-07-17 10:47:44 Authoring application: Microsoft Excel
MD5: e3de6ae15a70264ec5565d8b99072795 SHA-1: 384eaee61044f1863ba9f89de4713685fb89f5be SHA-256: 155d8f8b492c78b2509574aa4b22e6f93fc44ac2b6237b11f9f10fb90af4fb1f
140 Risk Score

Malware Insights

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

The sample is an Excel 4.0 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's text is a lure to enable macros, claiming the content is encrypted and requires enabling editing and content.

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
fb4419ea284bb3a91c2b826486d84bb7536b27a1ae55c7702c5e3a897c01e65f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 269025 bytes

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