Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fbaa920a4d0ffd34…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:16 Authoring application: Microsoft Excel
MD5: d29dc118e59a0000c0a999a183fbb21f SHA-1: cebcf3c0addcf5262a9469aab1c2b735a1b2d475 SHA-256: fbaa920a4d0ffd34c90b6e442c2ca8fdfc8ffa051018977a511cd255cceb11b5
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled document. Heuristics indicate the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro likely attempts to download and execute a second-stage payload, although the specific URLs or commands are not directly visible in the provided evidence.

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
817e3a94a32ee11469cb526f4d37c4b0ddfe7a906b9df0b06cb6ea926ec3f4c2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6713 bytes

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