Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4469722ffe50ba9f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:35 Authoring application: Microsoft Excel
MD5: 211e43afb5afe37b014fa49d2e11bae7 SHA-1: e96f2b0411b873e7d26ba8387c3dc39cce326aa8 SHA-256: 4469722ffe50ba9f80b1c1585e661516af65a2a753449ab384a7fce35067d72d
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing arbitrary code. The macro sheet contains a call to the RUN function, suggesting it is designed to launch a payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content.

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
49f2ea7a78500d0be98960b2d93970af987e961fbd25177b34a3fe5fb17a0f98		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6534 bytes

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