Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 258546822705c730…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:02 Authoring application: Microsoft Excel
MD5: 5f9adf2326b51ecc1e87e14bbada8840 SHA-1: 3daca7f24d6a6f0246ae5b839cadc658e79e0fb5 SHA-256: 258546822705c730a18d8fedcb97f7d1e5e7726b13cd6c84a58187c1828d6a6c
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 indicator of malicious intent. This technique allows for the execution of arbitrary code upon opening the document. The presence of dangerous formula APIs further supports the malicious nature of the macro. No specific family could be identified, and no external IOCs were extracted.

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
cc5864a66cce46da0f2e10d5f4d27f46940251ae3a37d7ed8c2e18c7e3f7242c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6574 bytes

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