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

Static analysis result for SHA-256 62d2599ad7f4062b…

MALICIOUS

Office (OLE) / .XLSX

44.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 085cd127b5aa4ecb0f1e108001fbfa08 SHA-1: a5ba75a49ab1d14e3023c7b0ccb90ec9c8cb1b3e SHA-256: 62d2599ad7f4062b84a3a8fd982b504b5b75f4843818dd10fac0badc3af8fcbe
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1564.002 Hide Artifacts: Directory Tampering T1203 Exploitation for Client Execution

This Excel file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a known technique for executing malicious code. The heuristics indicate the use of dangerous formula APIs and environment evasion, suggesting an attempt to execute a payload or perform malicious actions while evading detection. The presence of an Auto_Open entry directly points to an automated execution upon opening the document.

Heuristics 4

  • 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.
  • XLM Auto_Open environment-evasion HALT gate high OLE_XLM_ENVIRONMENT_EVASION_HALT
    Excel 4.0 macro sheet auto-executes multiple GET.WORKSPACE / GET.WINDOW environment checks and halts execution when the host does not match the expected user environment. This is a common sandbox-evasion pattern in XLM malware and is stronger than a bare XLM macro-sheet indicator.
  • 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
cff4dbd15f5e7c1a32cd13e982ad09f0b55661246a44015a0d1bea4468f01ad8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 13426 bytes

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