Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c57c92a13837943c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:24 Authoring application: Microsoft Excel
MD5: d17b4d9d61128ccc3f1be5d741c23bfb SHA-1: 1d4a49a7d6b0b5b0da31dd5577b08b1420cb346c SHA-256: c57c92a13837943ce4855702c30ed77537b12a83b811ce21d11be63d354fed84
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled document containing an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands. While no specific URLs or hashes were extracted, the primary function appears to be executing a payload via the Auto_Open macro.

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
9d150e91d4210b3a9711588271e6c599f910cb4482318d84f1d81a7c8f725b54		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6502 bytes

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