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

Static analysis result for SHA-256 102f7d81e2f1522a…

MALICIOUS

Office (OLE) / .XLS

168.0 KB Created: 2011-10-26 08:48:00 Authoring application: Microsoft Excel
MD5: 319793d9e19b3b7a7d2a7d96577cb377 SHA-1: 460186d49b1ec0faabc126d32d09e01412538aae SHA-256: 102f7d81e2f1522a40f83c6520147dd657a3a2ccce2ddc29865ad203e7af4668
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically triggering the Auto_Open function, which is known to be used for malicious purposes. The macros utilize dangerous formula APIs, indicating an attempt to execute arbitrary code. The presence of the Auto_Open defined name and the use of risky formula APIs strongly suggest an exploit execution attempt.

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
b1357e6ac252687e0341695b2aa39795e2283c0d1aceb6daa840a42506fdbf47		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 81754 bytes

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