Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9819f3ab566d1c8f…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:17 Authoring application: Microsoft Excel First seen: 2021-10-16
MD5: 10451d4303cc7d259a41c245ed8bce12 SHA-1: ba0a78ea15e1d981bd91f3413f7049dcb9b2e8ec SHA-256: 9819f3ab566d1c8fbeea16be5b5b2c81cb3522e70621d5ec93cbc8c5e8dfd8ac
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. The presence of dangerous formula APIs like RUN indicates that the macro is designed to execute arbitrary commands. The document body contains obfuscated text, likely part of the macro's execution flow or 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) 6479 bytes
SHA-256: 6fb626d71ab29063af7edf39359453f9e1da371e34163d43b3af822f5dd2fa85
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 -  AWEBI
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I145 
' 0018     24 LABEL : Cell Value, String Constant - GbrcXsxxo len=0 
' 0018     22 LABEL : Cell Value, String Constant - GlunXrl len=0 
' 0018     21 LABEL : Cell Value, String Constant - GrSYkZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - IcNQnCVhAIv len=0 
' 0018     25 LABEL : Cell Value, String Constant - IdJxmCOXpk len=0 
' 0018     26 LABEL : Cell Value, String Constant - KCAttmAxmOx len=0 
' 0018     21 LABEL : Cell Value, String Constant - kUsimD len=0 
' 0018     27 LABEL : Cell Value, String Constant - KvhjRXPIdBfE len=0 
' 0018     20 LABEL : Cell Value, String Constant - Musjg len=0 
' 0018     23 LABEL : Cell Value, String Constant - nrlSRIue len=0 
' 0018     27 LABEL : Cell Value, String Constant - OjOHhdqceEqT len=0 
' 0018     24 LABEL : Cell Value, String Constant - QntsqMSmK len=0 
' 0018     21 LABEL : Cell Value, String Constant - RAmFoF len=0 
' 0018     23 LABEL : Cell Value, String Constant - SGalYLeA len=0 
' 0018     27 LABEL : Cell Value, String Constant - SPCJVtwvBCpn len=0 
' 0018     27 LABEL : Cell Value, String Constant - SSpUMiJWoYhO len=0 
' 0018     25 LABEL : Cell Value, String Constant - UwzqszGsuh len=0 
' 0018     24 LABEL : Cell Value, String Constant - WyDLnafsd len=0 
' 0018     24 LABEL : Cell Value, String Constant - yXdFfPiOp len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZKuXZofNDDPR 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/ S
... (truncated)

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