Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5ecae0d4c6f9ce23…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:40 Authoring application: Microsoft Excel First seen: 2021-07-07
MD5: 954c3a065e6b702e9824bca55d406545 SHA-1: e95ea9869783689dc9ee0f0b097c2ab099800877 SHA-256: 5ecae0d4c6f9ce23bf5e8a1d0fec0210f2958e851e89357eea4e3a49fda82c48
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known method for executing malicious code. The macro sheet contains a reference to a dangerous formula API, specifically 'RUN', suggesting it is designed to execute an external payload. No specific URLs or further script content were extracted to identify the payload or family.

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) 6548 bytes
SHA-256: 2c20324cc98828ece2662b948247b3bde9bb8317fab5ebcba5d4d20b4a852d5a
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 -  iZfsr
' 0018     27 LABEL : Cell Value, String Constant - AUKqvXWJLdlM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G137 
' 0018     23 LABEL : Cell Value, String Constant - eyUOqIzA len=0 
' 0018     26 LABEL : Cell Value, String Constant - FKSCEfctmsG len=0 
' 0018     22 LABEL : Cell Value, String Constant - ftWByCd len=0 
' 0018     22 LABEL : Cell Value, String Constant - GnpCxqh len=0 
' 0018     25 LABEL : Cell Value, String Constant - JKLEoNOTBC len=0 
' 0018     23 LABEL : Cell Value, String Constant - MRuSOfJW len=0 
' 0018     21 LABEL : Cell Value, String Constant - MSvCEm len=0 
' 0018     24 LABEL : Cell Value, String Constant - nfXLQStlN len=0 
' 0018     27 LABEL : Cell Value, String Constant - NmSzKgzcBFLd len=0 
' 0018     23 LABEL : Cell Value, String Constant - OVeGssrM len=0 
' 0018     20 LABEL : Cell Value, String Constant - oycvw len=0 
' 0018     27 LABEL : Cell Value, String Constant - qTKlYAeJlPil len=0 
' 0018     23 LABEL : Cell Value, String Constant - rorPrkmN len=0 
' 0018     27 LABEL : Cell Value, String Constant - VErmmhAXGnOc len=0 
' 0018     26 LABEL : Cell Value, String Constant - vihajuuHsuu len=0 
' 0018     23 LABEL : Cell Value, String Constant - wfSFiDOU len=0 
' 0018     27 LABEL : Cell Value, String Constant - yKlIIWeJQNif len=0 
' 0018     27 LABEL : Cell Value, String Constant - YkTvAGFzHJzZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZBVyQuNMI 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
... (truncated)

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