Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 e970b64164a4bdb3…

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-25 10:39:51 Authoring application: Microsoft Excel
MD5: b4520d394b80e14d300bdf89688aa40c SHA-1: 709c0462fd4c002f0b10b80e7956ff0ca7b8e3bd SHA-256: e970b64164a4bdb34c178384703f5ecebbfee3125ba2167cbce4b59df001a207
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical indicator of malicious intent. The presence of the RUN function within these macros suggests the capability to execute arbitrary commands. While the specific commands or payloads are not fully detailed in the provided evidence, the mechanism points to a downloader or executioner.

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
2742592b4b185bb083583e338a77fc47abe9d3f0f64e3ffc606ca96cac5ef24c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6458 bytes

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