Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 50796c15a6842002…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:53 Authoring application: Microsoft Excel
MD5: 15d9ba5e7683415bd5d4369b36ca6d05 SHA-1: 60ab79df6bd41a32124855c04182fef52dd7e16d SHA-256: 50796c15a68420029f38bed0677ca00ce4e174112221404f549b61cd458ec21b
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. This indicates an attempt to automatically execute code upon opening the document. The presence of dangerous formula APIs further suggests malicious intent, likely to download and execute a second-stage payload.

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
246b6436e6941165daada4c8393ee6ae45928bd48b88a1119e9642d56ffcfa4f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6589 bytes

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