Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ec46da532627262…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:33:13 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: a8d5bae78592e0cb4d62ea92b258b752 SHA-1: 00c0e68dc991d7ad63f112c389c09837d7fda874 SHA-256: 6ec46da532627262ea4c8502b761a0b79381b9aeeea233f60db4074d87addd07
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet is designed to automatically execute upon opening, likely to download and run a secondary payload.

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) 6469 bytes
SHA-256: 681f26ef404e07ae1aae9b814e55ff1fcae39f6a95684072ca6f2aa0191983f0
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 -  dfgESt
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G145 
' 0018     27 LABEL : Cell Value, String Constant - bZzpENUZkcFK len=0 
' 0018     23 LABEL : Cell Value, String Constant - DCrUhhnk len=0 
' 0018     20 LABEL : Cell Value, String Constant - dfzJw len=0 
' 0018     24 LABEL : Cell Value, String Constant - eZKLoDwvQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - fqOgsw len=0 
' 0018     26 LABEL : Cell Value, String Constant - gKCcpgvFjuc len=0 
' 0018     27 LABEL : Cell Value, String Constant - gqvzyCRmVPQu len=0 
' 0018     27 LABEL : Cell Value, String Constant - jOMqBeIuaQPg len=0 
' 0018     21 LABEL : Cell Value, String Constant - jZgqLF len=0 
' 0018     23 LABEL : Cell Value, String Constant - mpbYBHri len=0 
' 0018     25 LABEL : Cell Value, String Constant - NEDnyZWpBl len=0 
' 0018     26 LABEL : Cell Value, String Constant - ngmaZaMIDMA len=0 
' 0018     22 LABEL : Cell Value, String Constant - nyPxJlC len=0 
' 0018     25 LABEL : Cell Value, String Constant - pfzJMwjuZB len=0 
' 0018     20 LABEL : Cell Value, String Constant - PMrNP len=0 
' 0018     22 LABEL : Cell Value, String Constant - qWSHKzb len=0 
' 0018     27 LABEL : Cell Value, String Constant - sHiygCezwOmI len=0 
' 0018     20 LABEL : Cell Value, String Constant - vTzAR len=0 
' 0018     21 LABEL : Cell Value, String Constant - WLfBgi len=0 
' 0018     22 LABEL : Cell Value, String Constant - zZhrrSL 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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