MALICIOUS
182
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
T1105 Ingress Tool Transfer
The file contains Excel 4.0 macros, identified by the OOXML_XLM_MACROSHEET heuristic. These macros utilize WinAPI functions such as URLDownloadToFileA and ShellExecuteA, as indicated by the OOXML_XLM_BINARY_WINAPI_STRINGS heuristic. The primary intent appears to be downloading and executing a second-stage payload from the reconstructed URL http://jdsofttech.com/ds/3.gif, which is also identified by the OOXML_XLM_CELL_ARRAY_URL heuristic. This suggests a downloader or droppper functionality.
Heuristics 4
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Excel 4.0 macro sheet (1 sheet(s)) critical 2 related findings OOXML_XLM_MACROSHEETSpreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.
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Binary XLM macro sheet with WinAPI/download strings critical OOXML_XLM_BINARY_WINAPI_STRINGSExcel 4.0 macro sheet is stored as BIFF12/XLSB binary data and contains Win32 download or process-execution API strings such as URLDownloadToFileA, ShellExecuteA, or CreateDirectoryA. These strings are high-signal in XLM macro sheets and catch payload-download macros that XML-formula scanners cannot parse.
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URL reconstructed from XLM cell array (1 URL) critical OOXML_XLM_CELL_ARRAY_URLExcel 4.0 macro sheet stages its payload URL across individual numeric cells (one ASCII charcode per cell) or inside an embedded HTA that uses VBScript Chr()/&-concat obfuscation. 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 BIFF12 record stream of every worksheet and macrosheet part and decoding RK/inline-string cells in both row-major and column-major order.
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Embedded URL info EMBEDDED_URLOne 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 http://jdsofttech.com/ds/3.gif Referenced by macro
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin353cb9e320e769bd0172c949754a12b71aae8fc508fdcdd3a2c593938b07a06a |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 200427 bytes |
Preview scriptFirst 1,000 lines of the extracted script
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% �� & % �� & % �� &
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... (truncated)
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