Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b95074a96e712459…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:52 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 9ed665778cdef4fc7f831d18b5fc601c SHA-1: ad3c1e9c19a051327dafe2d9f8b0f3688cfde075 SHA-256: b95074a96e7124595dd9f3307ddb514f8e7392b0dfaa5115dd1b07f5de0d4b8e
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 for arbitrary code execution. The presence of dangerous formula APIs like RUN further supports this. The macro sheet likely contains obfuscated code designed to download and execute a secondary payload, a common technique for initial access and further compromise.

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) 6702 bytes
SHA-256: 59285990efedc86c2cc158327d62da3b36e6ba133d7a70cdb29c156be9acd1e5
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 -  afDnecXzDIm
' 0018     20 LABEL : Cell Value, String Constant - aGiOX len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G133 
' 0018     25 LABEL : Cell Value, String Constant - aYXimNJpsS len=0 
' 0018     22 LABEL : Cell Value, String Constant - bbaVRuX len=0 
' 0018     24 LABEL : Cell Value, String Constant - bffyyeRcd len=0 
' 0018     25 LABEL : Cell Value, String Constant - EoMOmcVqYB len=0 
' 0018     23 LABEL : Cell Value, String Constant - fExdpflu len=0 
' 0018     21 LABEL : Cell Value, String Constant - fZJJcZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - gGaBdmd len=0 
' 0018     20 LABEL : Cell Value, String Constant - HJFSB len=0 
' 0018     25 LABEL : Cell Value, String Constant - IjouLMzdEZ len=0 
' 0018     26 LABEL : Cell Value, String Constant - JvzxDheWqUO len=0 
' 0018     21 LABEL : Cell Value, String Constant - kBjPqZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - MMhMb len=0 
' 0018     22 LABEL : Cell Value, String Constant - NRMODtL len=0 
' 0018     23 LABEL : Cell Value, String Constant - OHuABgRs len=0 
' 0018     20 LABEL : Cell Value, String Constant - PueFY len=0 
' 0018     22 LABEL : Cell Value, String Constant - qScLCRH len=0 
' 0018     22 LABEL : Cell Value, String Constant - rLrIdDh len=0 
' 0018     25 LABEL : Cell Value, String Constant - rTgsLfrtPE len=0 
' 0018     26 LABEL : Cell Value, String Constant - xcxpAMDICVj 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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