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

Static analysis result for SHA-256 d3345db33851543b…

MALICIOUS

Office (OLE) / .XLS

56.5 KB Created: 2020-09-20 21:17:44
MD5: 9e227b07643afd3444c4d30f0c47c3cf SHA-1: 22df9b7496903bdb3f8325c2c95aadff01773672 SHA-256: d3345db33851543b968f728d2a342c49dc72b0dc633da851518d8585e53af3ce
140 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros that are configured to execute automatically. The macros use PowerShell to download a file from 'https://tinyurl.com/y3psaqmm' into the user's AppData directory as 're.exe', and then execute it. This indicates a downloader or droppper functionality.

Heuristics 5

  • XLM Auto_Open with dangerous formula APIs high 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://tinyurl.com/y3psaqmm

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
64b868182c0236aec656718e20ab972a9b0c23bf16e042f8bfe64e4fdbf1a46d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 680 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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