Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d1dbd8e314509ad8…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:21 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 527e30e7c0b304e4c9ca6c2a4284ec35 SHA-1: 89ff12dab6a4f9f57c3d266042c66905b48ff9d9 SHA-256: d1dbd8e314509ad8050b62eb9ea2aec62142f83a34457ed56df9eb0697ddd37c
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-enabled workbook containing an Auto_Open function, which is a common technique for executing malicious code upon opening. The critical heuristics indicate the presence of dangerous formula APIs within the XLM macro, suggesting it's designed to perform harmful actions. The macro sheet itself is named 'usilHswj', and the document body contains obfuscated text, further indicating malicious intent.

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) 6694 bytes
SHA-256: 2fc22d33f676b91b908bd09933d3ba8536a855ee924ed2ca21a0116aa76c3b85
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  usilHswj
' 0018     21 LABEL : Cell Value, String Constant - anyQZu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H176 
' 0018     23 LABEL : Cell Value, String Constant - BdNYkNIx len=0 
' 0018     27 LABEL : Cell Value, String Constant - cSHdKYoThMGs len=0 
' 0018     27 LABEL : Cell Value, String Constant - dafVbfpmkWWb len=0 
' 0018     25 LABEL : Cell Value, String Constant - IpvptuctGi len=0 
' 0018     22 LABEL : Cell Value, String Constant - JDSNeBS len=0 
' 0018     20 LABEL : Cell Value, String Constant - NwnCU len=0 
' 0018     27 LABEL : Cell Value, String Constant - OawcxBXYeDhh len=0 
' 0018     26 LABEL : Cell Value, String Constant - oZXavxiuUxl len=0 
' 0018     27 LABEL : Cell Value, String Constant - RGVWimthLGiY len=0 
' 0018     25 LABEL : Cell Value, String Constant - RiKwHtWEla len=0 
' 0018     23 LABEL : Cell Value, String Constant - RUvnJpKk len=0 
' 0018     24 LABEL : Cell Value, String Constant - ScsNinntg len=0 
' 0018     24 LABEL : Cell Value, String Constant - SpHYsIXeV len=0 
' 0018     23 LABEL : Cell Value, String Constant - sQbVQvKO len=0 
' 0018     22 LABEL : Cell Value, String Constant - tAZSNQu len=0 
' 0018     25 LABEL : Cell Value, String Constant - UrlizGVxZh len=0 
' 0018     23 LABEL : Cell Value, String Constant - wQHBSgqe len=0 
' 0018     22 LABEL : Cell Value, String Constant - yogfWOY len=0 
' 0018     27 LABEL : Cell Value, String Constant - YPtsfFlfNGhC 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/
... (truncated)

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