Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 302bdbd03d3cd9e7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:42 Authoring application: Microsoft Excel First seen: 2021-09-27
MD5: 59d3c3957dd792a2826645729e92cde4 SHA-1: cd76c8f0f81cd3d7bb6d5a4550af833dee6da2cf SHA-256: 302bdbd03d3cd9e7c826ad922e0b54e54e7c7b48e9b36984ed8a2cbf329e46d8
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro sheet containing an Auto_Open entry, which is a known technique for executing malicious code upon opening the workbook. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands. No specific family could be identified, but the execution method is clear.

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) 6502 bytes
SHA-256: 7ec1616b05b5367956e65d7edf7b2432eb0141e88e84d3108562c4e31105b2ec
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 -  TEzqjs
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F123 
' 0018     20 LABEL : Cell Value, String Constant - Bjotz len=0 
' 0018     24 LABEL : Cell Value, String Constant - bLYAQVdZk len=0 
' 0018     24 LABEL : Cell Value, String Constant - CmiGOJukb len=0 
' 0018     25 LABEL : Cell Value, String Constant - CVfXNTxWxf len=0 
' 0018     24 LABEL : Cell Value, String Constant - cVJvAmCqq len=0 
' 0018     24 LABEL : Cell Value, String Constant - CzMEuqmRO len=0 
' 0018     23 LABEL : Cell Value, String Constant - dGoxheVT len=0 
' 0018     25 LABEL : Cell Value, String Constant - dtjzXPfyIf len=0 
' 0018     23 LABEL : Cell Value, String Constant - hSuJEiBO len=0 
' 0018     27 LABEL : Cell Value, String Constant - ihojxRnwBYhT len=0 
' 0018     20 LABEL : Cell Value, String Constant - imgnD len=0 
' 0018     21 LABEL : Cell Value, String Constant - JMvPrf len=0 
' 0018     23 LABEL : Cell Value, String Constant - kznkWtgW len=0 
' 0018     27 LABEL : Cell Value, String Constant - lEWFVEeRtsgL len=0 
' 0018     27 LABEL : Cell Value, String Constant - PEcGsymOStZc len=0 
' 0018     26 LABEL : Cell Value, String Constant - sraQyHtCclv len=0 
' 0018     24 LABEL : Cell Value, String Constant - tmpKeLbYi len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZFryJbuK len=0 
' 0018     26 LABEL : Cell Value, String Constant - zKOmvULvNbA len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZwdWWriDB 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

... (truncated)

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