Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 34d7c28d654c9856…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:08 Authoring application: Microsoft Excel
MD5: 54870881afd3c6637871675748ff5097 SHA-1: 066dfe14a8250f5bb81f265eae805b6fedd164c3 SHA-256: 34d7c28d654c98560dda7d8c7ff7e271464c70f1ae8f80e1434cdf5f45f5fe8c
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. The heuristics indicate the presence of dangerous formula APIs within the macro, suggesting it's designed to run arbitrary commands. The macro sheet itself is heavily obfuscated, but the Auto_Open entry points to a downloader or initial execution vector.

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
7602de2aa4302044d159df9b4da0fb57d87c25138c32b32eecd9e3beadef12f9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6406 bytes

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