Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f0b390ceb437768a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:36:31 Authoring application: Microsoft Excel
MD5: 4800075e3c6f88eaf6e2e0570d981376 SHA-1: 753d5f5529c5c193f8c8cc452de63c0e7b345f4e SHA-256: f0b390ceb437768af8ff2d7dc7f1d3112462c10ae3553980d836c3290b19322d
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open function. This function is designed to automatically execute when the workbook is opened, indicating a likely attempt to download and execute a secondary payload. The presence of dangerous formula APIs further supports this malicious intent.

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
0b102f60194d97f5ada6d1cfcddd430b1feb8916b51e8280660d2ba7ad57cb3e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6566 bytes

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