Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 59272566f36e4765…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:38 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 8305f7eb53bcfe2375a6fcd4c6e88cea SHA-1: 26148c9c2297f0d5f8e8023df2b79e4a53a210b5 SHA-256: 59272566f36e47653d0214d1b9ae89f8184fdc5848f7cf0de213a03aaff0ac59
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-enabled workbook. Static analysis detected an Auto_Open defined name, indicating that malicious code will execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is designed to download and execute a secondary payload. No specific family could be identified.

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) 6507 bytes
SHA-256: 28b2cd634cbb8e07f20f7cb0e64a068220ad1669d463634f7f8eb750220ff27f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  xWQ
' 0018     20 LABEL : Cell Value, String Constant - AmduH len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A169 
' 0018     23 LABEL : Cell Value, String Constant - cDJxhEWo len=0 
' 0018     20 LABEL : Cell Value, String Constant - CpyNQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - dPJSNo len=0 
' 0018     20 LABEL : Cell Value, String Constant - EgFtl len=0 
' 0018     22 LABEL : Cell Value, String Constant - hHXRDUx len=0 
' 0018     27 LABEL : Cell Value, String Constant - hvyTBRUXpQVu len=0 
' 0018     25 LABEL : Cell Value, String Constant - JrFncSxkOe len=0 
' 0018     24 LABEL : Cell Value, String Constant - jvYTSTMIY len=0 
' 0018     27 LABEL : Cell Value, String Constant - MjiBhaGMkJSL len=0 
' 0018     23 LABEL : Cell Value, String Constant - NeMfpLyK len=0 
' 0018     27 LABEL : Cell Value, String Constant - nEUMwoVgTHda len=0 
' 0018     26 LABEL : Cell Value, String Constant - nQdLjllCbHV len=0 
' 0018     21 LABEL : Cell Value, String Constant - PPmGCm len=0 
' 0018     20 LABEL : Cell Value, String Constant - qwcUv len=0 
' 0018     21 LABEL : Cell Value, String Constant - repNls len=0 
' 0018     20 LABEL : Cell Value, String Constant - sHPfI len=0 
' 0018     24 LABEL : Cell Value, String Constant - SMZgjNcuF len=0 
' 0018     20 LABEL : Cell Value, String Constant - SuuMk len=0 
' 0018     23 LABEL : Cell Value, String Constant - WNoelBiS 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
... (truncated)

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