Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2f4d6bd8ba7af8cb…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:40:30 Authoring application: Microsoft Excel
MD5: cc142f0ec1c4bea906ad42e77f6686c5 SHA-1: bad23fecefa12403654ce9c98878176ce76c3bc4 SHA-256: 2f4d6bd8ba7af8cbe375220ac1aab14bda766d4c77e70eb4f1a1e43191c39aa8
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 finding. This indicates the macro sheet is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN further suggests the intent to execute arbitrary commands, likely to download and run 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
7707f036f690b69b4282a982c56cfff767cbc5dfb5b66ac75ec0c0a31cf5a12b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6398 bytes

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