Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b40188148ee297b2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:53 Authoring application: Microsoft Excel
MD5: 1b0422499a493cac7eda369319717260 SHA-1: 9df4342852cf2c171f524205205dd8baaea76177 SHA-256: b40188148ee297b2c8e2b185f977c04b52d4067f3650fda72c2327241f072e0e
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 workbook containing an Auto_Open function. This function is designed to execute automatically when the workbook is opened, indicating an attempt to run malicious code. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload.

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
236c24a734c0e0363e023d617a1af9cfab22399b5530b23da9bb65d68c4a5ffe		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6618 bytes

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