Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d6d89def75c2c852…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:59 Authoring application: Microsoft Excel
MD5: ddc6a0d1c72c3640bea540e6452ab0a5 SHA-1: 6f2d71270f6dfa6a2f3e09b5c0583e79e242d986 SHA-256: d6d89def75c2c852e2841d1ea56f0e5e7c2dc40364bffca36e499654bd6f0fba
140 Risk Score

Malware Insights

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

The critical heuristic firings indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code upon opening the document. The macro sheet contains a reference to a dangerous formula API, suggesting it is designed to run arbitrary commands. The presence of an Auto_Open function strongly implies the intent to execute a second-stage 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
53466bb0b311e09dec2553f0f8ec165a6581b29f005c3c6f1ff781cb4b2f3cf2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6893 bytes

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