Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 38767d122e7bfab0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:45 Authoring application: Microsoft Excel
MD5: ed4af0e515a83f5f3dd7f25779ba5015 SHA-1: eaba08e79cf93c65edd35383ab1570972080ea89 SHA-256: 38767d122e7bfab038a1b1115f8350d5975b3f4c88b60dd46204c0aa82581d9d
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 an Auto_Open function, which is a known technique for executing malicious code. The critical heuristic firings indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it is designed to run arbitrary commands. No specific malware family is identifiable from the provided evidence.

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
f1b7b7fe38ca91cee58674cd7c67c6f5396557cec35f49c3b00b87f408d9ac17		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6631 bytes

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