Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2c19c4f9647032b7…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:59 Authoring application: Microsoft Excel First seen: 2021-07-13
MD5: af7ce8288a80798e041a11a9085fce86 SHA-1: 5f525f28d34d6aba2bbf9d9deae3b7b79ac52625 SHA-256: 2c19c4f9647032b7001a2c93c17cc183ee997e68e9fc6198304728341f4baaec
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 automatic execution upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute commands or download additional content. While no specific URLs or hashes were extracted, the technique strongly implies a downloader or initial execution stage for further malicious activity.

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) 6374 bytes
SHA-256: e1225fcc4f6e76863d3563adb237ba628c4b8fb3c156797b9c5014694cb7e227
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  XXhqW
' 0018     20 LABEL : Cell Value, String Constant - aEdgM len=0 
' 0018     22 LABEL : Cell Value, String Constant - aPIiHEP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B182 
' 0018     25 LABEL : Cell Value, String Constant - bWnuRWXOdR len=0 
' 0018     21 LABEL : Cell Value, String Constant - cSUhRu len=0 
' 0018     20 LABEL : Cell Value, String Constant - DvWGk len=0 
' 0018     24 LABEL : Cell Value, String Constant - DxdPXzDPC len=0 
' 0018     20 LABEL : Cell Value, String Constant - HvWqv len=0 
' 0018     22 LABEL : Cell Value, String Constant - hYVrSuu len=0 
' 0018     20 LABEL : Cell Value, String Constant - LgJLh len=0 
' 0018     24 LABEL : Cell Value, String Constant - LhedxQvcg len=0 
' 0018     26 LABEL : Cell Value, String Constant - mZCOrvlOFGe len=0 
' 0018     20 LABEL : Cell Value, String Constant - NpioY len=0 
' 0018     21 LABEL : Cell Value, String Constant - ohzdCg len=0 
' 0018     27 LABEL : Cell Value, String Constant - pZUNTIgyzuJc len=0 
' 0018     20 LABEL : Cell Value, String Constant - rZNWU len=0 
' 0018     26 LABEL : Cell Value, String Constant - tVsPuVQASTb len=0 
' 0018     22 LABEL : Cell Value, String Constant - UKhZOlF len=0 
' 0018     20 LABEL : Cell Value, String Constant - wdHUI len=0 
' 0018     22 LABEL : Cell Value, String Constant - wTFXymG len=0 
' 0018     25 LABEL : Cell Value, String Constant - wYIVXlYyGf 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     10 LABELSST : Cell Valu
... (truncated)

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