Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c5869d4b9edac52…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:20 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: dce485998972bb6edefbb2fa3b4f8496 SHA-1: 01bc01902cb5d5f2478dd5644b29218e9c3be520 SHA-256: 6c5869d4b9edac52f8ba12834ef18ee1552725b9f7a68e75a9ce65152b684bb2
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, indicated by multiple critical heuristic firings including OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The presence of an Auto_Open macro suggests an intent to automatically execute code upon opening the document. This mechanism is commonly used to download and execute further malicious payloads.

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) 6542 bytes
SHA-256: a15d56ac3bb3b454dc07d5cecb3c6a61ef9cf4a76ed6904808a692f02b0300d4
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 -  DyvaJF
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C165 
' 0018     27 LABEL : Cell Value, String Constant - AZAmpPROuQwE len=0 
' 0018     27 LABEL : Cell Value, String Constant - bAIDClYPLTRZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - BppwsUN len=0 
' 0018     23 LABEL : Cell Value, String Constant - bPteoGiN len=0 
' 0018     27 LABEL : Cell Value, String Constant - cRlRbsGqFvqX len=0 
' 0018     25 LABEL : Cell Value, String Constant - DVayvrcdAS len=0 
' 0018     22 LABEL : Cell Value, String Constant - eMDaUEr len=0 
' 0018     26 LABEL : Cell Value, String Constant - fRgzqrHdyVZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - jUDFy len=0 
' 0018     25 LABEL : Cell Value, String Constant - lDUvyjBBwa len=0 
' 0018     23 LABEL : Cell Value, String Constant - lFKUwrMX len=0 
' 0018     20 LABEL : Cell Value, String Constant - LIxOJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - PpgldUhozSQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - RbXvj len=0 
' 0018     26 LABEL : Cell Value, String Constant - rpkQHzyvJOX len=0 
' 0018     24 LABEL : Cell Value, String Constant - vbRxkXrIg len=0 
' 0018     24 LABEL : Cell Value, String Constant - vVcSsrTIr len=0 
' 0018     21 LABEL : Cell Value, String Constant - VxRcLZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZqFROhHfS len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZzbUR 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  
... (truncated)

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