Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9e0949171b4644d0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:36 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 1d8f6d3f148b5c975f41057f5aabaf9a SHA-1: 278c8cd119848bee872922ca2a623b07d486c5ea SHA-256: 9e0949171b4644d0c93aba08bdd0928e62fed12ee3b34ea5716b026978b490de
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 defined name, which is a common technique for executing malicious code. The `RUN` function API is also present, suggesting the macro attempts to execute a command or payload. The document body contains obfuscated text, likely intended to hide malicious content or commands.

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) 6574 bytes
SHA-256: 16fe6438ed71cefe7b9b3cd81c734f21e800551416506d716bc1f995a3121031
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NaCSHFxjuGh
' 0018     21 LABEL : Cell Value, String Constant - aePeKT len=0 
' 0018     23 LABEL : Cell Value, String Constant - aKsuzqes len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H177 
' 0018     20 LABEL : Cell Value, String Constant - azXFb len=0 
' 0018     21 LABEL : Cell Value, String Constant - bVUFGy len=0 
' 0018     22 LABEL : Cell Value, String Constant - CulspTz len=0 
' 0018     20 LABEL : Cell Value, String Constant - DIkjZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - FJpLB len=0 
' 0018     24 LABEL : Cell Value, String Constant - fJZiUdIbM len=0 
' 0018     26 LABEL : Cell Value, String Constant - FnxiCqwMVDZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - hkwAPRzNjIT len=0 
' 0018     24 LABEL : Cell Value, String Constant - iKMjEtXsc len=0 
' 0018     24 LABEL : Cell Value, String Constant - KururgkCF len=0 
' 0018     20 LABEL : Cell Value, String Constant - mFLGO len=0 
' 0018     20 LABEL : Cell Value, String Constant - PfQUW len=0 
' 0018     21 LABEL : Cell Value, String Constant - SnHBHb len=0 
' 0018     25 LABEL : Cell Value, String Constant - uTTHADhBkW len=0 
' 0018     20 LABEL : Cell Value, String Constant - VLPak len=0 
' 0018     20 LABEL : Cell Value, String Constant - WkAuq len=0 
' 0018     27 LABEL : Cell Value, String Constant - YAiaUPcFnLZh len=0 
' 0018     20 LABEL : Cell Value, String Constant - ygnVn 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 V
... (truncated)

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