Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fc53b8c15b9306fd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:17 Authoring application: Microsoft Excel
MD5: 74f6764dcfaf9ce6c8b0240489f7af1f SHA-1: abe5316a7658622a927d87feb57992bc562405bb SHA-256: fc53b8c15b9306fdeabdbb543e7d5b454f0e23fe7dbb4c07aa881d1bd82cbc4f
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 method for executing malicious code upon opening the document. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. While no specific URLs or hashes were extracted, the technique itself is highly indicative of a downloader or initial execution stage.

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
6a7abb5b31c21f66ba9a2ea06bfd8342db709882cbd6d1f8e3443e68f493a783		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6769 bytes

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