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

Static analysis result for SHA-256 cce27e98342a6be8…

MALICIOUS

Office (OLE) / .XLS

80.5 KB Created: 2020-10-25 18:24:14 Authoring application: Microsoft Excel
MD5: e6f099b51a7f71f074ac6b546e3beb75 SHA-1: 4fe5aa180a0d4ec5b5b5904ebfe4bab7cf31cb99 SHA-256: cce27e98342a6be85a3371576ccf49839f18cc2ee496814f005059e979a190b5
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro designed to execute code. The XLM macro explicitly reconstructs and executes a PowerShell command to download a file named 'do.exe' from 'https://tinyurl.com/y5n5y9zr' and then moves it to the temp directory. This indicates the sample is a downloader for a second-stage payload.

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
38c1b2d14fc7ae098a2cedeeda56b7f2c670ed48045971a76faf2af3642b70a1		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1826 bytes
macros.bas
8bed49825dc7fe67a44a1e268cf275fafb14b7b63a2f9dbfc287bca4aaad1cab		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 640 bytes

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