Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a2fa6de1f4e1dfc3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:22 Authoring application: Microsoft Excel
MD5: 6c77df5e0c7dff5f2d6f72890657fb75 SHA-1: 41b4065656a2e897e5f0ce8b2e60628f9927a29b SHA-256: a2fa6de1f4e1dfc339ef00eedc45df0d73d8c6da8b59931f73c11e8d99193f80
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 function, which is a known technique for executing malicious code within spreadsheets. The presence of dangerous formula APIs in the Auto_Open macro suggests an intent to run arbitrary commands or exploit vulnerabilities. The document body contains heavily obfuscated text, likely intended to evade detection or mislead analysis.

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
fc129cc007178a37c1060953d0d5b665f7e4de850dcd491797548f4cda1a2843		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6551 bytes

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