Xls.Downloader.TrGreenDoc021121-9911900-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 2902000d5c8c7d57…

MALICIOUS

Office (OLE) / .XLS

303.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 7a19fad88c1adfd5edbca687098bf65a SHA-1: 6a16139a3cbaf82bf39f6b06f3c46502ca9c32d8 SHA-256: 2902000d5c8c7d579e47baebb921c5a49719061c0c6f57f768d1f6a126927753
262 Risk Score

Malware Insights

Xls.Downloader.TrGreenDoc021121-9911900-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 macro-enabled spreadsheet that utilizes an Auto_Open function to execute. The macro reconstructs and attempts to download a payload from one of three embedded URLs. The ClamAV detection name 'Xls.Downloader.TrGreenDoc021121-9911900-0' further supports its function as a downloader.

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: Xls.Downloader.TrGreenDoc021121-9911900-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.TrGreenDoc021121-9911900-0
  • 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://imperialmm.com/423QuvpC/fe.html
    • https://nimixtutorials.ir/Spi1mddp6iW2/fe.html
    • https://technozone.az/Z4fMF8i72l7E/fe.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
4aef308d866a76cc8980db17fb7f066796c815f3ab8fbaeb740b93f43e38e1d9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 11289 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.