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

Static analysis result for SHA-256 5e5f369f3b7d53a3…

MALICIOUS

Office (OLE) / .XLS

24.5 KB Created: 2020-09-20 21:17:44
MD5: d8e6d83ef891aff113da2bd4e5f5a6ab SHA-1: c3b19195228f75b437a9c5b3df2028df1b1cbdc5 SHA-256: 5e5f369f3b7d53a3717b0f4b713d84aa1fd353f78944a753a73484afc39b1274
162 Risk Score

Malware Insights

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

The Excel 4.0 macro sheet contains an Auto_Open macro that uses a series of EXEC calls to construct and execute a PowerShell command. This command downloads a file named 'pd.bat' from the URL https://cutt.ly/VhWMygb into the temporary directory and then executes it. The use of CHAR() functions to obfuscate the command is noted.

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/VhWMygb

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
941021830f5d17c741191af34073e359bb4a586e7b7373ef1e402f8e2cd5d47b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1599 bytes

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