MALICIOUS
244
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 that are reassembled from CHAR() and split formulas. These macros utilize WinAPI functions such as URLDownloadToFileA and ShellExecuteA to download a payload from the URL https://grupo-gw.com/21.psd and execute it. The ClamAV detection name 'Xls.Dropper.QbotDocu12020-9818439-0' strongly suggests the Qbot family.
Heuristics 6
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ClamAV: Xls.Dropper.QbotDocu12020-9818439-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Dropper.QbotDocu12020-9818439-0
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Excel 4.0 macro sheet (1 sheet(s)) critical 3 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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XLM payload reassembled from CHAR()/split formulas critical OOXML_XLM_REASSEMBLED_PAYLOADAn Excel 4.0 macro sheet builds its payload inside the formula token stream by concatenating per-character CHAR() calls and string fragments, so no WinAPI name, shell command, or URL is ever contiguous in the .bin for a literal-bytes scan to find. Reassembling the formulas recovered download/execute API names, LOLBin commands (regsvr32/rundll32/mshta/wmic/powershell), or a payload URL — the de-obfuscated download-and-run kill chain.
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XLM payload URL string (1 URL) info OOXML_XLM_PAYLOAD_URLAn Excel 4.0 (XLM) macro-sheet workbook with download/execute evidence carries a literal http(s) URL stored as a (often UTF-16) string in the shared-string table or a cell. This is the next-stage payload host referenced by the macro download chain (URLDownloadToFile/ShellExecute); surfaced as an IOC.
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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 https://grupo-gw.com/21.psd Referenced by macro
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin3fd5d57a928c8ba818db7c001502d9473d992f17b434009561c9d63b9b02fe10 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.bin | 22574 bytes |
Preview scriptFirst 1,000 lines of the extracted script
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Y@% �� & A
W@% �� & B
@V@% �� & C
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N@% �� & E
T@% �� & F
Y@% �� & G
4@% �� & H
Y@% �� & I
�V@% �� & J
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D@% �� & Q
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1@% �� & R
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2W o DW X�DW Y� DW Z� Ao X �? Y �? Z �? \ % �� & X
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I@ \ % �� & [
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0@ \ % �� & \
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... (truncated)
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