Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e08292c4581e2d17…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:14 Authoring application: Microsoft Excel
MD5: 4e82632a8720d833c60e38fa6682d082 SHA-1: f913bfacc8e986661060fa48cd2ef8e9dada7103 SHA-256: e08292c4581e2d179b1e6e4f710b994a6305851d7fd4edacb4e44351b25dd555
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 potential for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet likely contains code to download and execute a secondary payload, although the specific URLs or commands are not directly visible in the provided excerpt.

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
1ee624ed79669453fec60ccf9ca32d191eab22ce1f07cf07248828df167b6ab7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6479 bytes

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