Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dc8f6428e204b69b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:47 Authoring application: Microsoft Excel First seen: 2021-06-28
MD5: 43b4ea399b7090dd53325649ffefce5c SHA-1: d03d7fe8681470c349493fd8eea9444a2b45de6d SHA-256: dc8f6428e204b69be6ad60a2ec98365ba047a7edb9782f719b82f660b0918b47
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry point, which is a common technique for executing malicious code. The macro sheet contains a defined name 'Auto_Open' and uses dangerous formula APIs, suggesting it's designed to run automatically. While no specific URLs or further payloads were extracted, the Auto_Open function strongly implies an intent to execute arbitrary code, likely as part of a phishing 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) 6713 bytes
SHA-256: 2c120ccc1d12aef34faded85444856d17ae6749b4bb1730a51c54e391181bec7
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 -  fYBqLZv
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E194 
' 0018     20 LABEL : Cell Value, String Constant - CGxju len=0 
' 0018     21 LABEL : Cell Value, String Constant - CHMEwT len=0 
' 0018     24 LABEL : Cell Value, String Constant - ctUtEqBcT len=0 
' 0018     26 LABEL : Cell Value, String Constant - fgFWxuMRRPW len=0 
' 0018     24 LABEL : Cell Value, String Constant - fOmJFSvbM len=0 
' 0018     26 LABEL : Cell Value, String Constant - gjaaKEMrzld len=0 
' 0018     27 LABEL : Cell Value, String Constant - IykoXalmkgRy len=0 
' 0018     27 LABEL : Cell Value, String Constant - jbqoVtISGUKV len=0 
' 0018     20 LABEL : Cell Value, String Constant - kbbNE len=0 
' 0018     22 LABEL : Cell Value, String Constant - lqhYbgC len=0 
' 0018     21 LABEL : Cell Value, String Constant - nammkR len=0 
' 0018     27 LABEL : Cell Value, String Constant - NlTXHDZyJueN len=0 
' 0018     20 LABEL : Cell Value, String Constant - OUVTK len=0 
' 0018     22 LABEL : Cell Value, String Constant - OXbQtal len=0 
' 0018     22 LABEL : Cell Value, String Constant - qjTwafI len=0 
' 0018     23 LABEL : Cell Value, String Constant - QXzzIAiO len=0 
' 0018     27 LABEL : Cell Value, String Constant - WSFHhGQAWqXR len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZBUBMKvrZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - zotQBsqc len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZzViTaWXftO 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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