MALICIOUS
184
Risk Score
Heuristics 5
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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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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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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 http://rmska.net/r/.end Referenced by macro
- http://rmska.net/r/log.sdReferenced by macro
- http://rmska.net/r/Referenced 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/sheet1.bin | 728723 bytes |
SHA-256: 6bebdb8d98256b8219ed84bf01e10192122ea817860996308ff038aeaa017c03 |
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Preview scriptFirst 1,000 lines of the extracted script
� � � @ �������� � � 6 � � � @ d � $ � � % �� & � � , � < �? � � � % �� & , 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� &
, 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� &
, 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ! , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & " , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & # , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & $ , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & % , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & & , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ' , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ( , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ) , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & * , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & + , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & , , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & - , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & . , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & / , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 0 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 1 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 2 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 3 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 4 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 5 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 6 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 7 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 8 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & 9 , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & : , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ; , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & < , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & = , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & > , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ? , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & @ , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & A , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & B , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & C , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & D , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & E , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & F , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & G , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & H , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & I , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & J , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & K , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & L , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & M , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & N , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & O , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & P , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & Q , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & R , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & S , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & T , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & U , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & V , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & W , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & X , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & Y , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & Z , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & [ , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & \ , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ] , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ^ , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & _ , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & ` , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & a , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & b , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & c , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & d , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & e , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & f , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & g , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & h , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & i , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & j , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & k , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & l , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & m , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & n , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & o , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & p , 6
! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 % �� & q , 6
... (truncated)
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