Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c269ff31b0808dba…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:56 Authoring application: Microsoft Excel First seen: 2026-06-05
MD5: ba24aa24e3bcf5648e6ce0f03e6f9236 SHA-1: 937479e82c0021840c3f16cba1c95f929b309e11 SHA-256: c269ff31b0808dbac71053e72125dc7969a8f3cc4d632a2910ce2f65f54b4f89
140 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 automatic execution upon opening. The critical heuristic firings confirm the presence of dangerous formula APIs like RUN=0, suggesting the macro is designed to execute arbitrary commands. This is a common technique for downloading and executing further malicious content.

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) 6468 bytes
SHA-256: 861a4b39483e471143423f04b3d06a56dd6417ba2b517a21e846094606d2f23d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GdIJ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F180 
' 0018     22 LABEL : Cell Value, String Constant - bZQILxu len=0 
' 0018     24 LABEL : Cell Value, String Constant - gwANeQwaC len=0 
' 0018     21 LABEL : Cell Value, String Constant - HWmHoc len=0 
' 0018     25 LABEL : Cell Value, String Constant - IvykgvVWgY len=0 
' 0018     20 LABEL : Cell Value, String Constant - JrOqn len=0 
' 0018     22 LABEL : Cell Value, String Constant - lYWXige len=0 
' 0018     21 LABEL : Cell Value, String Constant - MjRfxm len=0 
' 0018     22 LABEL : Cell Value, String Constant - oJstikD len=0 
' 0018     26 LABEL : Cell Value, String Constant - pjCIKsJJDQe len=0 
' 0018     23 LABEL : Cell Value, String Constant - qsavlYlU len=0 
' 0018     21 LABEL : Cell Value, String Constant - rAnyLV len=0 
' 0018     25 LABEL : Cell Value, String Constant - rcyOdeRzFV len=0 
' 0018     27 LABEL : Cell Value, String Constant - rtLoUlSKZxSF len=0 
' 0018     24 LABEL : Cell Value, String Constant - SgWabuUxw len=0 
' 0018     22 LABEL : Cell Value, String Constant - swYBewq len=0 
' 0018     27 LABEL : Cell Value, String Constant - SYSFaAkomZnN len=0 
' 0018     20 LABEL : Cell Value, String Constant - VoZXo len=0 
' 0018     27 LABEL : Cell Value, String Constant - wQHveUlEYpiC len=0 
' 0018     25 LABEL : Cell Value, String Constant - yFDGUXaxJu len=0 
' 0018     27 LABEL : Cell Value, String Constant - zJKcNYhHDQLm 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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