MALICIOUS
120
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, indicated by the OOXML_XLM_MACROSHEET heuristic. The OOXML_XLM_BINARY_WINAPI_STRINGS heuristic further reveals that these macros contain WinAPI calls such as URLDownloadToFileA, DownloadToFileA, and ShellExecuteA, suggesting an intent to download and execute a second-stage payload. The presence of these WinAPI strings and the overall structure strongly indicate a macro-based downloader. The specific IOCs are the WinAPI functions themselves, as no URLs or executable paths were explicitly reconstructed from the truncated script.
Heuristics 2
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Excel 4.0 macro sheet (1 sheet(s)) critical 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.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin99a6a52acb8f5c734f6d86faf89e0637a94ac99f953aa583d2658b47d2e1f9b9 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 194023 bytes |
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