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

Static analysis result for SHA-256 0a1e5efce0cc6042…

MALICIOUS

Office (OLE) / .XLS

70.0 KB Created: 2020-09-20 21:17:44
MD5: 1f849a7cf8dd228d0adc960e95c074a5 SHA-1: fea838fecb16a23717429f25967b5d9f21b9b5f8 SHA-256: 0a1e5efce0cc604290c614b1b4e3f6828942c3516dc230c23e4d6aadcd6591b8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The Excel 4.0 macro sheet contains an Auto_Open macro that executes a PowerShell command. This command is obfuscated but reconstructs to download and execute a batch file named 'pd.bat' from the provided shortened URL. The macro also attempts to move and hide the batch file in the temporary directory.

Heuristics 5

  • 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 workbook contains URL shortener medium OLE_XLM_URL_SHORTENER
    Workbook contains an Excel 4.0 macro-sheet marker and visible URL-shortener targets in the OLE bytes. This is a common XLM downloader shape even when formula recovery is incomplete.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cutt.ly/khWJjnw

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9e470068d1278fa7bd6bd01bc1670f20edba73f696f765d290a50d5d5271a193		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1947 bytes

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