Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5018013063afa7e2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:27 Authoring application: Microsoft Excel
MD5: 3ddee8f59a43404f6beaf10e749a977a SHA-1: d1b1be71afddbf801479a061b4ccd634f2a65ab1 SHA-256: 5018013063afa7e292d4870bf0ee14a728e1aa89643b7928068e6bb3cdd885a1
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically triggering an Auto_Open function. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute a second-stage payload, although the specific payload or its destination could not be determined from 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
20761b294c0a3f524cbdb0f3769c50ca301fdad77a6896ccadda755f41ab6808		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6722 bytes

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