Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 263309f0099d10f4…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:10 Authoring application: Microsoft Excel
MD5: 2de71b3d7afc078391c23fbe8ed88cc7 SHA-1: 923b6f16ed3047c58d771c1d334e08c2edbbd3fd SHA-256: 263309f0099d10f470df2b1fa2aa8502f8892d965927e7b63b684463b90c19b5
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary commands or download further payloads. Without a specific URL or command, the exact payload remains unknown, but the execution mechanism is clear.

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
f454102e402b54cb4c193c1d5f1131c75b52ecabc1503ffe81747c3fac67004f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6577 bytes

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