Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 027aa60f7a84edbc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:32:43 Authoring application: Microsoft Excel
MD5: 073c8022d9dae74a53d0d22a98e6dde2 SHA-1: 3b29a7aad440aaedf22cb16e00d4c2f4afd7c73d SHA-256: 027aa60f7a84edbc4145215660fa99642fa7714d548918bff175011aea8688e3
140 Risk Score

Malware Insights

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

The file is identified as malicious due to the presence of Excel 4.0 (XLM) macros. Specifically, the Auto_Open defined name and the use of dangerous formula APIs like RUN indicate that the macro is designed to execute arbitrary code upon opening. This is a common technique for delivering secondary payloads.

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
e05c3b21f203f88ef1b91819f6c13dd167ff7facb90df6aa7d4a3507afd7c53e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6652 bytes

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