Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 30a502cc637cd317…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:17 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: bf8a3635943fa77663ab331ae63f67ea SHA-1: a7d6fc0ed444e6af9bbb5928307c50f68489acd9 SHA-256: 30a502cc637cd317ef7bbdeb93d3967a364f6dced10c56bce99d37d65beb4e9b
140 Risk Score

Malware Insights

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

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry that utilizes dangerous functions. This strongly suggests the file is designed to execute arbitrary code when opened, likely leading to further malicious activity. No specific IOCs were extracted from the macro content itself.

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) 6668 bytes
SHA-256: 5363c46d06daf7a4392cbe9185ffa8ac32beb2650917e1efe95bb2eda239634a
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 -  tNzNv
' 0018     25 LABEL : Cell Value, String Constant - asiGyEYiUy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A151 
' 0018     22 LABEL : Cell Value, String Constant - bggbdxS len=0 
' 0018     25 LABEL : Cell Value, String Constant - KvmjJzMFqc len=0 
' 0018     27 LABEL : Cell Value, String Constant - kzyAVzLCeUGF len=0 
' 0018     21 LABEL : Cell Value, String Constant - mjjdZy len=0 
' 0018     26 LABEL : Cell Value, String Constant - pxJJuZQVLyk len=0 
' 0018     23 LABEL : Cell Value, String Constant - QYtaKDQY len=0 
' 0018     25 LABEL : Cell Value, String Constant - rcwUGmENqy len=0 
' 0018     25 LABEL : Cell Value, String Constant - rjPZafommK len=0 
' 0018     26 LABEL : Cell Value, String Constant - rpLWaMfRJrY len=0 
' 0018     23 LABEL : Cell Value, String Constant - rvWgBjWp len=0 
' 0018     25 LABEL : Cell Value, String Constant - sosCsaOEFc len=0 
' 0018     24 LABEL : Cell Value, String Constant - TfqaQncwn len=0 
' 0018     20 LABEL : Cell Value, String Constant - UAuag len=0 
' 0018     22 LABEL : Cell Value, String Constant - ubgMIdK len=0 
' 0018     24 LABEL : Cell Value, String Constant - wAjwmyeay len=0 
' 0018     24 LABEL : Cell Value, String Constant - WfKAZuacv len=0 
' 0018     26 LABEL : Cell Value, String Constant - WqbwqFyGrLF len=0 
' 0018     26 LABEL : Cell Value, String Constant - xHDAKdygGTV len=0 
' 0018     25 LABEL : Cell Value, String Constant - yzlQeWSYkr 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/ S
... (truncated)

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