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

Static analysis result for SHA-256 0f09c7aeb9f39540…

MALICIOUS

Office (OLE) / .XLS

70.0 KB Created: 2020-09-20 21:17:44
MD5: e979f2a4a626eda0521ed5e63195d7bf SHA-1: a8fc04bbcf7d9038852acef0d824ec5cdc72bf84 SHA-256: 0f09c7aeb9f395407dc199397216cf35e055f0461114c2f35071e1f7b6a5bc24
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains Excel 4.0 macros that are configured to automatically execute upon opening. These macros construct and execute PowerShell commands to download a file named 'pd.bat' from the URL 'https://cutt.ly/jhUMUGI' into the temporary directory. Subsequent commands attempt to move, hide, and then execute the downloaded batch file, indicating a downloader or dropper functionality.

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
a6a7e3bb0b070581e3173ebc7f32fd1b5b0d6a73955d8d138ea355a97dcd4b4d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1634 bytes

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