Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dae589d0b87578f2…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:44:24 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 0d65c47e116f9e75077b29898770c0a5 SHA-1: dd4c13f369a77429b7f0ca0743967ed70f22a6c6 SHA-256: dae589d0b87578f20caa42228f3702a6c4d620ebb5cd16f1eafccd0cbcc68c55
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 function, which is a known method for executing malicious code. The `RUN` formula API was identified, suggesting the macro attempts to execute an external command or payload. The presence of an Auto_Open entry points to an attempt at automatic execution upon file opening.

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) 6838 bytes
SHA-256: 2fc5ca9003cc593a9504dac4aa7938aff98f3a0e492e2d40e1b093cd8bc44662
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  AYdCJjC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G133 
' 0018     22 LABEL : Cell Value, String Constant - BoJSvuN len=0 
' 0018     24 LABEL : Cell Value, String Constant - BspsSeLqx len=0 
' 0018     21 LABEL : Cell Value, String Constant - CgFoYa len=0 
' 0018     21 LABEL : Cell Value, String Constant - CWGoiS len=0 
' 0018     21 LABEL : Cell Value, String Constant - GySCeM len=0 
' 0018     22 LABEL : Cell Value, String Constant - HtegowU len=0 
' 0018     21 LABEL : Cell Value, String Constant - huUGjZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - jFlcjMRg len=0 
' 0018     24 LABEL : Cell Value, String Constant - knDmiVNMX len=0 
' 0018     26 LABEL : Cell Value, String Constant - mzDspbQHREE len=0 
' 0018     25 LABEL : Cell Value, String Constant - oMntWWyZSw len=0 
' 0018     27 LABEL : Cell Value, String Constant - qaXnNcEKZkYb len=0 
' 0018     22 LABEL : Cell Value, String Constant - qEcphtc len=0 
' 0018     26 LABEL : Cell Value, String Constant - uhOxQTwzKsn len=0 
' 0018     23 LABEL : Cell Value, String Constant - URENUmVJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - WOsFcEZYVbN len=0 
' 0018     27 LABEL : Cell Value, String Constant - wQDSlWWurIeU len=0 
' 0018     27 LABEL : Cell Value, String Constant - WyHCmclMeUuJ len=0 
' 0018     27 LABEL : Cell Value, String Constant - YNSttmcWGpRj len=0 
' 0018     22 LABEL : Cell Value, String Constant - yukhMoj 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
' 
... (truncated)

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