MALICIOUS
182
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
T1566.001 Spearphishing Attachment
The file contains Excel 4.0 macros, which are known to be used for malicious purposes. These macros reconstruct and execute URLs pointing to external resources, likely for downloading and executing a secondary payload. The presence of these macros and the embedded URLs strongly suggests a malicious document intended for initial compromise via spearphishing.
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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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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URL reconstructed from XLM cell array (2 URLs) critical OOXML_XLM_CELL_ARRAY_URLExcel 4.0 macro sheet stages its payload URL across individual numeric cells (one ASCII charcode per cell), inside an embedded HTA that uses VBScript Chr()/&-concat obfuscation, or split across multi-char fragment cells a download formula concatenates by reference (=A1&A2&… / CONCATENATE(...)). 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/shared-string cells in row-major and column-major order plus FORMULA cell-reference concatenation in token 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 https://ssmdevelopers.in/4RaxIGAPtfPM/yu.html Referenced by macro
- https://ramblerimport.com/hz4UhluT5au/yu.htmlReferenced by macro
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 114422 bytes |
SHA-256: 75671d724d6899f82f10be918456f4b8569f54253b0a4110770ac348ebb331f6 |
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Preview scriptFirst 1,000 lines of the extracted script
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! " # % �� & , 6
! " # % �� & , 6
% �� & , 6
4 % �� & , 6
4 % �� & , 6
6 % �� & , 6
� 4 - h t t p s : / / s s m d e v e l o p e r s . i n / 4 R a x I G A P t f P M / y u . h t m l ] - h t t p s : / / s s m d e v e l o p e r s . i n / 4 R a x I G A P t f P M / y u . h t m l % �� & , 6
� 4 - h t t p s : / / r a m b l e r i m p o r t . c o m / h z 4 U h l u T 5 a u / y u . h t m l ] - h t t p s : / / r a m b l e r i m p o r t . c o m / h z 4 U h l u T 5 a u / y u . h t m l % �� & , 6
... (truncated)
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