Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b0f29a7249c05bfa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:45 Authoring application: Microsoft Excel First seen: 2021-06-20
MD5: 57862cc811034f002416b66905869470 SHA-1: e6bc35e37796349ba8ff729c39494523970c8306 SHA-256: b0f29a7249c05bfaf1c58ff2055eebeac936fbe3cbf321d06aa63b19dff406ae
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 upon opening the document. The use of dangerous formula APIs like RUN further suggests malicious intent. Without further script content, the exact payload and execution chain remain unclear, leading to an unknown family classification.

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) 6473 bytes
SHA-256: 721cb92c78e3a02b3c9d253bdcb65d36901028d10dee57c1f86fd18d5daa9f01
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  PjqXAo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F155 
' 0018     26 LABEL : Cell Value, String Constant - cryzAawWnQK len=0 
' 0018     24 LABEL : Cell Value, String Constant - ddQNuQKsE len=0 
' 0018     24 LABEL : Cell Value, String Constant - dYYjrmxAS len=0 
' 0018     20 LABEL : Cell Value, String Constant - fFHnF len=0 
' 0018     25 LABEL : Cell Value, String Constant - fLzkfRXaNa len=0 
' 0018     24 LABEL : Cell Value, String Constant - HkHZxTQeK len=0 
' 0018     25 LABEL : Cell Value, String Constant - HVixCAtjXz len=0 
' 0018     21 LABEL : Cell Value, String Constant - InMMCa len=0 
' 0018     25 LABEL : Cell Value, String Constant - jGIjyKmRWb len=0 
' 0018     25 LABEL : Cell Value, String Constant - jrtTLOBJzu len=0 
' 0018     21 LABEL : Cell Value, String Constant - kCnhNR len=0 
' 0018     27 LABEL : Cell Value, String Constant - kdDebfzlrbom len=0 
' 0018     21 LABEL : Cell Value, String Constant - kekDOs len=0 
' 0018     21 LABEL : Cell Value, String Constant - RAYByp len=0 
' 0018     24 LABEL : Cell Value, String Constant - rChGalCak len=0 
' 0018     26 LABEL : Cell Value, String Constant - SgWIzqeYnFl len=0 
' 0018     24 LABEL : Cell Value, String Constant - tUZibCDnq len=0 
' 0018     24 LABEL : Cell Value, String Constant - ufuExlptZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - WpXXlDSKre len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZbuXPaODp 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
' 00
... (truncated)

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