Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ddff29c46762db16…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:28:00 Authoring application: Microsoft Excel First seen: 2021-06-30
MD5: 96b3fb9c9dca85f590bb3cf99bab1cae SHA-1: 50511312a95790f5ff79f0ca23763c78775c27bc SHA-256: ddff29c46762db16225a886c8845579246df6d7dd7983c77c90c37df3606b701
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 defined name, which is a common technique for executing malicious code upon opening. The presence of dangerous formula APIs like RUN indicates the macro is designed to execute arbitrary commands. While the specific payload is not visible, the pattern strongly suggests it acts as a downloader 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) 6607 bytes
SHA-256: 07f76ba132c594509a89391992df655829fa77a38b21ba5bf7e96cc55b0a2bd8
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  HqgfVddNy
' 0018     20 LABEL : Cell Value, String Constant - aCVQM len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B197 
' 0018     26 LABEL : Cell Value, String Constant - CZnHxjnvrUB len=0 
' 0018     24 LABEL : Cell Value, String Constant - dSRMMlZvu len=0 
' 0018     23 LABEL : Cell Value, String Constant - eYbmocTe len=0 
' 0018     27 LABEL : Cell Value, String Constant - FlFvkZTNfPOS len=0 
' 0018     27 LABEL : Cell Value, String Constant - IbzQRmCxytQD len=0 
' 0018     27 LABEL : Cell Value, String Constant - JlEOfTJHOwRm len=0 
' 0018     25 LABEL : Cell Value, String Constant - kAURDjRYQT len=0 
' 0018     27 LABEL : Cell Value, String Constant - KkPZiDMdXyYK len=0 
' 0018     25 LABEL : Cell Value, String Constant - kMIaZQHODP len=0 
' 0018     20 LABEL : Cell Value, String Constant - kQVRM len=0 
' 0018     22 LABEL : Cell Value, String Constant - pXgtyMp len=0 
' 0018     21 LABEL : Cell Value, String Constant - qGdcAU len=0 
' 0018     22 LABEL : Cell Value, String Constant - rbYzXPF len=0 
' 0018     24 LABEL : Cell Value, String Constant - RMupjtBcq len=0 
' 0018     26 LABEL : Cell Value, String Constant - sMpVUYPLJaT len=0 
' 0018     20 LABEL : Cell Value, String Constant - TTqud len=0 
' 0018     22 LABEL : Cell Value, String Constant - TYsIpaK len=0 
' 0018     26 LABEL : Cell Value, String Constant - WpdmodxWWOl len=0 
' 0018     24 LABEL : Cell Value, String Constant - yWUuVuuwl 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
... (truncated)

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