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

Static analysis result for SHA-256 1d9ace126ddd51f3…

MALICIOUS

Office (OLE) / .XLS

164.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bcd6f978f83b1f6e0041767d01b0a774 SHA-1: b1e9bbe7f60ac9a120bc22e72c85e4b74abebb91 SHA-256: 1d9ace126ddd51f337a0c34ea38bcbfa6e9512e71b221f2fa1575e7ce675f23b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that contains an Auto_Open function. This function is designed to execute a command that downloads a payload from the URL 'http://uqw16atsxge03cbwwx.com/summer.'. The presence of the 'SE_ENABLE_LURE' heuristic indicates that the document likely prompts the user to enable macros, facilitating the execution of the malicious macro code.

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.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
43b02397b518204b274a3f75e90a39e7fc229a6f2140fc448755b8ad5376463e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6866 bytes

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