Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3c9cfa8c2dca7b7b…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:43:04 Authoring application: Microsoft Excel
MD5: be71d94d126375a23c2175401aefa2d9 SHA-1: a1a28e55e494703abd0f33a12f9ab2289c243c8f SHA-256: 3c9cfa8c2dca7b7b92f330fcb72e3f3eb7088630a5226e950d64953b9d4821c7
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 an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary code. The macro sheet itself contains obfuscated data that likely serves as a payload or further instructions.

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
d93572d626fa1b4e00cadf7841ec5f050342d14ed87794db823b14f68e4a1d01		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6600 bytes

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