Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 582e85de64a97093…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:06 Authoring application: Microsoft Excel First seen: 2021-06-13
MD5: 3ca4027227ee6a71cf21c80acc9d99d3 SHA-1: c6931ea10effea4b7cae0eb32c028318abab6685 SHA-256: 582e85de64a970934cbaa2d97b22241c56c3a433b288bbfa0c5413b7acccee67
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 macro, which is a critical finding. This indicates the file is designed to automatically execute code upon opening. The presence of dangerous formula APIs like RUN suggests the macro is intended to download and execute a secondary payload, a common technique for malware delivery.

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) 6516 bytes
SHA-256: a435f505f29aa3ba62dd59769a08351a7c6ae6fff633f841eb94bce159fd963f
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 -  EzQxUO
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A150 
' 0018     25 LABEL : Cell Value, String Constant - bnelFLERFJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - BOvQASLetx len=0 
' 0018     20 LABEL : Cell Value, String Constant - bPpNn len=0 
' 0018     21 LABEL : Cell Value, String Constant - dOqVQc len=0 
' 0018     24 LABEL : Cell Value, String Constant - FJxKfKnjX len=0 
' 0018     27 LABEL : Cell Value, String Constant - FzlUuFrQLqOI len=0 
' 0018     25 LABEL : Cell Value, String Constant - GBlPRzKNGj len=0 
' 0018     20 LABEL : Cell Value, String Constant - HrHFE len=0 
' 0018     22 LABEL : Cell Value, String Constant - lVCWWXn len=0 
' 0018     25 LABEL : Cell Value, String Constant - MflTUXCUfW len=0 
' 0018     22 LABEL : Cell Value, String Constant - MMNxcTu len=0 
' 0018     20 LABEL : Cell Value, String Constant - mogPT len=0 
' 0018     27 LABEL : Cell Value, String Constant - mtqSekqjkdQu len=0 
' 0018     24 LABEL : Cell Value, String Constant - namvAqmLl len=0 
' 0018     23 LABEL : Cell Value, String Constant - SNLpIrnB len=0 
' 0018     27 LABEL : Cell Value, String Constant - sOYVNyIIXIHy len=0 
' 0018     22 LABEL : Cell Value, String Constant - tDACFjb len=0 
' 0018     24 LABEL : Cell Value, String Constant - TugLUxgzv len=0 
' 0018     22 LABEL : Cell Value, String Constant - xQwxJIP len=0 
' 0018     26 LABEL : Cell Value, String Constant - YWXgSlsbQoS 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   
... (truncated)

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