Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d52bfa77f84e27e8…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:33:33 Authoring application: Microsoft Excel
MD5: a983fbec6490ccabbf7acf8583b07ea2 SHA-1: 5c689c44a85e379f53b18e002c95a56e7b4a9c07 SHA-256: d52bfa77f84e27e8ba7b75a91db0d05506968a8084dad0414324439e69303ebd
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 indicator of malicious intent. This technique is often used to execute arbitrary code upon opening the document. The presence of the `RUN` function within the macro formulas strongly suggests the execution of a secondary payload, likely downloaded from an external source.

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
e51ca383d992a6db85a430da609013b0d4c5c1d62e165dd5e2106b6f9dcff919		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6571 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.