Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2973dd01db4c6323…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:43:41 Authoring application: Microsoft Excel First seen: 2021-09-22
MD5: 091ad8c410ae3f1c1f0aeec098f2c396 SHA-1: 0107fbdb66a003ae6919a302958d1d75c94ea126 SHA-256: 2973dd01db4c632304d27fd46cd65697873723e2dbd454c91bd98439c97c0ecb
140 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The macros utilize dangerous formula APIs, including the RUN function, suggesting an intent to execute arbitrary commands. This is a common technique for downloading and executing further malicious payloads.

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) 6413 bytes
SHA-256: 73be936d6860c42e9e61d9767b36576b3d214964312f5a59d4f1db97f3b3f827
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 -  qLM
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C152 
' 0018     23 LABEL : Cell Value, String Constant - cfFTJuLF len=0 
' 0018     22 LABEL : Cell Value, String Constant - dBudbmR len=0 
' 0018     26 LABEL : Cell Value, String Constant - eAmPirnHZVb len=0 
' 0018     20 LABEL : Cell Value, String Constant - EavpP len=0 
' 0018     24 LABEL : Cell Value, String Constant - GazJYRfzr len=0 
' 0018     21 LABEL : Cell Value, String Constant - GqEaDE len=0 
' 0018     22 LABEL : Cell Value, String Constant - HIZwypE len=0 
' 0018     23 LABEL : Cell Value, String Constant - hLXvgQQZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - HyahkWOQN len=0 
' 0018     27 LABEL : Cell Value, String Constant - IOMTTWeMKotW len=0 
' 0018     26 LABEL : Cell Value, String Constant - LVbKLMdomGR len=0 
' 0018     26 LABEL : Cell Value, String Constant - NEtbUEuuKHm len=0 
' 0018     22 LABEL : Cell Value, String Constant - NIGSBAm len=0 
' 0018     20 LABEL : Cell Value, String Constant - nwHSC len=0 
' 0018     20 LABEL : Cell Value, String Constant - oCjCh len=0 
' 0018     26 LABEL : Cell Value, String Constant - ptRcIhCNafl len=0 
' 0018     24 LABEL : Cell Value, String Constant - UAWDYLMOO len=0 
' 0018     22 LABEL : Cell Value, String Constant - UHDetFX len=0 
' 0018     24 LABEL : Cell Value, String Constant - WtUOiFQet len=0 
' 0018     20 LABEL : Cell Value, String Constant - YHtGu 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 LABELSS
... (truncated)

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