Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0ce66f80f82cbc9e…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:44:04 Authoring application: Microsoft Excel First seen: 2021-10-14
MD5: 1f34bcf77b339bd5aebcd2aff25391b8 SHA-1: b8b0f3c1db61e68aa73cbf025c71080fb512578a SHA-256: 0ce66f80f82cbc9e5cec9347cf6b211401ced54fcf7594546a7e13e044749b38
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. The macro sheet contains a reference to 'Auto_Open', suggesting an attempt to automatically run code when the workbook is opened. This points to a macro-based execution attack.

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) 6738 bytes
SHA-256: 57924ea33a7ac9d2cea2da3eccc8c5c9058099bc6ac3b83dd29ae2425c3f52b6
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 -  kWzezLH
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C137 
' 0018     25 LABEL : Cell Value, String Constant - BlkLuXszrs len=0 
' 0018     24 LABEL : Cell Value, String Constant - DRvNnALxt len=0 
' 0018     22 LABEL : Cell Value, String Constant - FJjBqIp len=0 
' 0018     24 LABEL : Cell Value, String Constant - fmAktuEUe len=0 
' 0018     24 LABEL : Cell Value, String Constant - fVpzFqNgN len=0 
' 0018     22 LABEL : Cell Value, String Constant - GbFFFOI len=0 
' 0018     21 LABEL : Cell Value, String Constant - hOOpmN len=0 
' 0018     21 LABEL : Cell Value, String Constant - hSVSQl len=0 
' 0018     26 LABEL : Cell Value, String Constant - jcgbMdobdXc len=0 
' 0018     24 LABEL : Cell Value, String Constant - JHqHdBgsG len=0 
' 0018     20 LABEL : Cell Value, String Constant - KYquA len=0 
' 0018     25 LABEL : Cell Value, String Constant - OjYrsXXVnJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - owMTwkJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - PlJxQadgtsz len=0 
' 0018     21 LABEL : Cell Value, String Constant - pyZFoX len=0 
' 0018     27 LABEL : Cell Value, String Constant - qLeQQummdaBA len=0 
' 0018     26 LABEL : Cell Value, String Constant - rNpRdLsCyPR len=0 
' 0018     23 LABEL : Cell Value, String Constant - sTSFLLpF len=0 
' 0018     20 LABEL : Cell Value, String Constant - tWgbi len=0 
' 0018     20 LABEL : Cell Value, String Constant - XdilP 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 LA
... (truncated)

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