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

Static analysis result for SHA-256 e98e15ea657cdf44…

MALICIOUS

Office (OLE) / .XLSX

469.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 7a4f8a8f08517669df1c5757f4504290 SHA-1: cb204de43f5d566aea2c57d9516cf203ddf0d58c SHA-256: e98e15ea657cdf448599aa9600815d30984705e92f82fbd2aa30648c8323d760
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristic firings. The Auto_Open macro is configured to execute automatically. The extracted document body and macro content suggest the macro's purpose is to download a payload from the URL 'http://starwineiro.ch/casrtnoar/count.php'.

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
877b24336da75137a3a99cda7752c4a2d3bef2725374cfe3b531d5b368960619		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 14228 bytes

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