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

Static analysis result for SHA-256 076c11df218d9fd8…

MALICIOUS

Office (OLE) / .XLS

80.0 KB Created: 2020-10-25 18:24:14 Authoring application: Microsoft Excel
MD5: bfa6b801f26f67cc2231d4191a2486e5 SHA-1: d6c3fe24036c6b402eeb80e065a11280aa236625 SHA-256: 076c11df218d9fd86a809bb3e3b4a9c2211caad31e630d731d64592bee49eec4
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros that are configured to auto-execute. The macro uses the EXEC function to run a PowerShell command that downloads a second-stage payload from a tinyurl.com URL and saves it as 'ay.exe' in the temporary directory. This indicates a downloader or droppper functionality.

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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
352edf7ff9a339b2edaec5732617d4d10b0cfc7cac82f59d360e5622b3cdec22		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1797 bytes
macros.bas
8bed49825dc7fe67a44a1e268cf275fafb14b7b63a2f9dbfc287bca4aaad1cab		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 640 bytes

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