Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9201a49eecc0f195…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:55 Authoring application: Microsoft Excel
MD5: f594577db3f217f7de74461ad9c25b40 SHA-1: 3a79d0885a8a16a4cbb0c1ac8e34cc54869e5cca SHA-256: 9201a49eecc0f1952f68c9baf03f228f8ea9bc0b081765b75973ceed5fb1cdc8
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 finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is likely designed to execute arbitrary commands upon opening the document, leading to further compromise.

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
3a85bfda1f3aa71146acf1f51300116eea611a837ac6a3aa39acda33dcd5050f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6788 bytes

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