Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 68fc49319c545a03…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:47 Authoring application: Microsoft Excel First seen: 2021-05-26
MD5: 67d6d93a99c42270a128c18f46241b4e SHA-1: 355083f57abf0e26be1eb4b87ef998caa136519e SHA-256: 68fc49319c545a03500af0aa6896127ab3d74de876591c6af33afaa14bd45241
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 defined name, which is a critical finding indicating potential malicious execution. The presence of dangerous formula APIs further supports this. The macro sheet itself is identified as a macro sheet, confirming the use of XLM macros for execution.

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) 6846 bytes
SHA-256: a87f836686cee8f26edc44c9542ca628b7b32adfc6e421a8e6254b5380efa795
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GhlfzeCdpVM
' 0018     24 LABEL : Cell Value, String Constant - aaVLIARPL len=0 
' 0018     25 LABEL : Cell Value, String Constant - agiIwWQHCm len=0 
' 0018     23 LABEL : Cell Value, String Constant - aKnTjOQj len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D183 
' 0018     25 LABEL : Cell Value, String Constant - bRuTujfeQl len=0 
' 0018     23 LABEL : Cell Value, String Constant - duUxOOLR len=0 
' 0018     24 LABEL : Cell Value, String Constant - FSPPDYojH len=0 
' 0018     21 LABEL : Cell Value, String Constant - HDAEmD len=0 
' 0018     21 LABEL : Cell Value, String Constant - hfWTzi len=0 
' 0018     20 LABEL : Cell Value, String Constant - JqQxS len=0 
' 0018     25 LABEL : Cell Value, String Constant - LSvXjSDnyI len=0 
' 0018     26 LABEL : Cell Value, String Constant - MqeruApyhGL len=0 
' 0018     20 LABEL : Cell Value, String Constant - mSAtf len=0 
' 0018     24 LABEL : Cell Value, String Constant - NCcglBWMw len=0 
' 0018     21 LABEL : Cell Value, String Constant - QZUXDU len=0 
' 0018     23 LABEL : Cell Value, String Constant - rNtLucLQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - soMBnFcuBuq len=0 
' 0018     20 LABEL : Cell Value, String Constant - vOFTn len=0 
' 0018     24 LABEL : Cell Value, String Constant - VsHQnpUbF len=0 
' 0018     27 LABEL : Cell Value, String Constant - WOagpiDiCAIw len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZAvvtREN 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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