Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 37e50421382fea64…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:06 Authoring application: Microsoft Excel
MD5: b09a5a83e731cfa16e0b57ce483b70f3 SHA-1: 7534d5b8b8f40e3c0d055deb0a3986c231b2dbc2 SHA-256: 37e50421382fea64a07a1f403ade92494256aa70289545359df3f41dff4fa7ac
140 Risk Score

Malware Insights

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

The file is an Excel macro-enabled document containing Excel 4.0 (XLM) macros. The presence of an Auto_Open defined name and the use of dangerous formula APIs like RUN indicate an attempt to automatically execute 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
96bdcec44a6fff03a552f18e2ca6c6232d04542a1994195afb1d52aa57dd0a87		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6667 bytes

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