Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6bdb45ce5d22cd74…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:54 Authoring application: Microsoft Excel
MD5: b312c485ad77650452a732960292dfca SHA-1: bc2573feb94bda7cb2b6dabf13939904e3c247c9 SHA-256: 6bdb45ce5d22cd74b5335edeaa887b1723799667c1bb931901e9169adbc590fd
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 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 suggests malicious intent. The macro sheet itself contains obfuscated strings and potentially executable code, though the exact payload is not discernible 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
ebc500e6ad992da64afa31266c13f6e74aa7d18c4bdad60f7319928aff199f58		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6949 bytes

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