Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0bf1172522c59215…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:31 Authoring application: Microsoft Excel
MD5: daca3ab0275b50489defe6569f96520b SHA-1: 56431eda49ede431b694953015dd7b27fa189a4b SHA-256: 0bf1172522c592153746ac785b9e87036acdc038a9b69cdda9eec7540dae8006
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 method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs in the Auto_Open macro indicates an intent to run arbitrary commands. While the exact payload is not discernible from the provided evidence, the mechanism strongly suggests a downloader or initial execution stage.

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
bdf0d6c12f202f25f1afe7702eab8d7905f18834a1b74f158a52d9aeefa276ba		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6442 bytes

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