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

Static analysis result for SHA-256 c9d9905a183a3cd1…

MALICIOUS

Office (OLE) / .XLS

126.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 9336f4bbc0e3cc8c13a1232a94f131ad SHA-1: 25d8596788d72e6c1b9b7b9bfc523e42c0a9d33c SHA-256: c9d9905a183a3cd19f9adf19a8dfdb902a58fae5a6a82cb1e0cf4a4816dff1b9
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File Execution: Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a strong indicator of malicious intent. The macros reconstruct and execute URLs to download a second-stage payload. The ClamAV detection as 'Doc.Downloader.Qbot12212-9916031-0' further supports this. The reconstructed URLs are: https://arancal.com/HgLCgCS3m/be.html https://iperdesk.com/JWqj8R2nt/be.html https://grandthum.co.in/9Z6DH5h5g/be.html

Heuristics 6

  • 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.
  • URL reconstructed from XLM cell array (3 URLs) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime) or across individual numeric cells (one ASCII charcode per cell). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries plus LABELSST/RK/NUMBER cells.
  • ClamAV: Doc.Downloader.Qbot12212-9916031-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Qbot12212-9916031-0
  • 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://arancal.com/HgLCgCS3m/be.html
    • https://iperdesk.com/JWqj8R2nt/be.html
    • https://grandthum.co.in/9Z6DH5h5g/be.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
f59398a4a2df98896b6d5ba540db29aaf2ed7157d4ee9fb32ab5115fad781f6a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 12393 bytes

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