Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b430e2ce1743aa38…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:40:52 Authoring application: Microsoft Excel
MD5: 94d037a3592b80541c1ac14804ace430 SHA-1: 80e65d16286bb33e0f32d2a864a62ae163751272 SHA-256: b430e2ce1743aa386e9db846bd5ed4f23776ca8f0db787d798a3cf093b740787
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 known technique for executing malicious code upon opening the workbook. The heuristics indicate the use of dangerous formula APIs within the XLM macro, suggesting an attempt to execute arbitrary code. This points to a macro-based downloader or dropper.

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
1a6b1f3fbe5e881b4e6b1bba4bc8316addda7a52f3a190d404354dbce0f1a32d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6926 bytes

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