Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b740697d98c083fa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:53 Authoring application: Microsoft Excel
MD5: c019789a57765e508da97e1e760b8072 SHA-1: 2cad2eee0dc0ffd1be5c61fd9feba046c82680c8 SHA-256: b740697d98c083fa3ae097de011c4640a3aaa0b081f9d3389a7d9c9deab90faa
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN further confirms its malicious intent to execute arbitrary commands.

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
c42b4f44a5cf908e05591f1ab4e723536bc32b4c3cedbe71c9a179d41a783920		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6655 bytes

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