MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Service Execution
T1204.002 Malicious File: User Execution: Malicious File
T1105 Ingress Tool Transfer: Ingress Tool Transfer
The file contains an Excel 4.0 macro sheet, identified by the OOXML_XLM_MACROSHEET heuristic. This macro sheet includes strings indicative of WinAPI calls for downloading and executing files, such as URLDownloadToFileA, DownloadToFileA, and ShellExecuteA. The presence of these strings suggests the macro's intent is to download and execute a second-stage payload from a remote source. The OOXML_XLM_BINARY_WINAPI_STRINGS heuristic further confirms the presence of these potentially malicious WinAPI calls within the binary macro sheet.
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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