Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c4a061ff7d452e49…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:42:23 Authoring application: Microsoft Excel
MD5: 470797f554b24714d4eda48fc23b7863 SHA-1: 3ff236e09f78c9962fb803542f6ba67e775b4975 SHA-256: c4a061ff7d452e496a02ab215815093643f41f468c73f6e1c9d0445f982b059d
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 sheet, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The presence of an Auto_Open defined name suggests that the macro will execute automatically upon opening the workbook. The dangerous formula APIs used in the macro indicate it is designed to perform malicious actions, such as downloading and executing a 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
de1801d5de3f1049b5c7210ddb8ba4475cf45163a49f596072770da5bd6e1d0e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6559 bytes

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