Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 59471ede5b99902f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:16 Authoring application: Microsoft Excel
MD5: f188aeff03b3f7058cd988564f15e280 SHA-1: bdb5b379186863a2fcf962a886b4447b2bac58ec SHA-256: 59471ede5b99902ff19bf1f7ffc5d709ad7cc2653fc7d9d770e8c7592c63e191
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 workbook. Static analysis detected the presence of an Auto_Open macro, which is configured to execute dangerous formula APIs. This indicates the workbook is designed to run arbitrary code when opened, likely to download and execute a second-stage payload.

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
be5673f81d3e1f90cb6463357b5367405cb095bd9b6b86e5951a4e47005a5c0c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6558 bytes

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