Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ad75d4729ff06894…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:40:37 Authoring application: Microsoft Excel
MD5: 4f61ceef949d48bf04ac669361646bbd SHA-1: 32c418626f34702dbd6b6a8bbc017dce9a1757cf SHA-256: ad75d4729ff06894f11887c3aeaa0555be4b93ac11af16eedf8b4ecf599c3724
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macro sheets, specifically triggering an Auto_Open defined name. Heuristics indicate the use of dangerous formula APIs, suggesting the macro is designed to execute arbitrary code or commands. The presence of an Auto_Open entry strongly implies an attempt to automatically run malicious code upon opening the workbook.

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
a169f13a0494bd6c6f8652f0aafb0cf907d6a47606ed4402813789cca787f597		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6751 bytes

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