MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file is an Excel document containing Excel 4.0 macros, which are known to be used for malicious purposes. The heuristic 'XLM payload reassembled from CHAR()/split formulas' indicates that the macros are likely constructing and executing a payload, potentially downloading it from the embedded URL. The specific URL 'https://' is incomplete but suggests a network connection for payload retrieval.
Heuristics 2
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Excel 4.0 macro sheet (3 sheet(s)) critical 1 related finding 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.
Extracted artifacts 3
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 | 5899 bytes |
SHA-256: a5a5a283f44af341ea536e79ac8abfdec4535cd26259fee4aaeddf6922c005d4 |
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Preview scriptFirst 1,000 lines of the extracted script
� � � @ �������� � � F � % �� & � � @ d � $ � � % �� & � m , � < 8 m < 9 9 I < : B m < C �? m � � % �� & , : C : < = > ? @ B % �� & , : C : < = > ? @ B % �� & , : C : < = > ? @ B % �� & , : C : < = > ? @ A B C % �� & , : C : < =
> ? @ A B C % �� & , : F : < = > ? @ A B C D E F % �� & ! , : F :
< = > ? A B C D E F % �� & " , : F : < = > ? @ A B C D E F % �� & # , : F : < = > ? @ A B C D E F % �� & $ , : F : = > ? @ A B C D E F % �� & % , : F : = > ? @ A B C D E F % �� & & , : F : = > ? @ A B C D E F % �� & ' , : F > ? @ A B C D E F % �� & ( , : F =
A FB L . L d e c v s b g v r s x L x r g x g B s C D E F % �� & ) , : F : = A B C D E F % �� & * , : F : = A B C D E F % �� & + , : F : = A B C D E F % �� & , , : F = A B C D E F % �� & - , : F A B C D E F % �� & . , : F A B C D E F % �� & / , : F A B C D E F % �� & 0 , 5 F A B C D E F % �� & 1 , 5 F 5 A B C D E F % �� & 2 , 5 F A B C D E F % �� & 3 , 5 F A B C D E F % �� & 4 , 5 F A B C D E F % �� & 5 , 5 F A B C D E F % �� & 6 , 5 F A B C D E F % �� & 7 , 5 F B % �� & 8 , 5 F B % �� & 9 , 5 F B % �� & ; ,
... (truncated)
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xlm_sheet_01.bin |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 1158 bytes |
SHA-256: b503ede42cdf904e2af5c974f8dc360e708418fa45acca6ff4722bf393f0454f |
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Preview scriptFirst 1,000 lines of the extracted script
� � � @ �������� � & 4 � % �� & � � @ d � $ � � % �� & � m , � < 0 4 m � � % �� & , & 2 & % �� & , & 2 & 2 % �� &
, & 2 2 % �� & , & 2 2 % �� & , & 2 2 % �� &
, & 2 / 2 % �� & , & 2 / 0 % �� & , & 2 / 0 2 % �� & , 0 3 0 % �� & , 0 3 0 % �� & , 0 3
0 B 6 % �� & , 0 3 0 1 3 % �� & , 0 3 0 1 3 � � B � Ѓ� 0ffffff�?ffffff�? �? �?333333�?333333�?% �� & �
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xlm_sheet_02.bin |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.bin | 6203 bytes |
SHA-256: d31123f9a07e81ccf791dca8e5e37ecc4c2d30b43e94ccbd560bc857c4b313d4 |
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Preview scriptFirst 1,000 lines of the extracted script
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0�B `� % �� &
, 5 ;
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... (truncated)
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