Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 de5e42f0c5374d1b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:24 Authoring application: Microsoft Excel
MD5: e0737cb34542d35f09e6bb895f235983 SHA-1: 1640cd98b3dabebcf0e025402501d0442c8f4ed7 SHA-256: de5e42f0c5374d1bf105bb3093b02a3cdd29db4272af73efb832d7507e826e1f
140 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is designed to execute arbitrary code, indicated by the 'RUN=0' formula API usage. The presence of an Auto_Open macro strongly suggests the intent to download and execute a secondary payload upon opening the document.

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
81368c9b20a216817439c513028033dd01e49d384cefa42137713390f067742d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6539 bytes

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