Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6492d1f5298582ac…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:46 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: 865d965713bc85e813a67413d45dbae2 SHA-1: 46b21fde9952f8fdb38b8d07b106a17d7a123bbf SHA-256: 6492d1f5298582ac866563ef596d867a195babb5657012568a7f9e32b0132f2f
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 function, which is a known method for executing malicious code upon opening the document. The critical heuristics indicate the presence of dangerous formula APIs within the XLM macro sheet, suggesting it's designed to run arbitrary commands. No specific family could be identified, but the technique is common for initial 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) 6597 bytes
SHA-256: 2866123f9519fd766bf2b06ffbdeac8f6991a8be317f2ae11f9e99a9dcf66166
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 -  AhOyS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C155 
' 0018     21 LABEL : Cell Value, String Constant - cLXJWC len=0 
' 0018     22 LABEL : Cell Value, String Constant - eegKEmB len=0 
' 0018     22 LABEL : Cell Value, String Constant - ePQnlYy len=0 
' 0018     24 LABEL : Cell Value, String Constant - ffjaJlSPH len=0 
' 0018     22 LABEL : Cell Value, String Constant - guFdVMq len=0 
' 0018     23 LABEL : Cell Value, String Constant - HhJUkyJE len=0 
' 0018     21 LABEL : Cell Value, String Constant - iSeomQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - iTyJChJZgB len=0 
' 0018     21 LABEL : Cell Value, String Constant - JZVTkl len=0 
' 0018     25 LABEL : Cell Value, String Constant - kacWnvUqcF len=0 
' 0018     22 LABEL : Cell Value, String Constant - KPoFttf len=0 
' 0018     21 LABEL : Cell Value, String Constant - LkgDhX len=0 
' 0018     22 LABEL : Cell Value, String Constant - ohPBkis len=0 
' 0018     26 LABEL : Cell Value, String Constant - QkdVRYLEhBw len=0 
' 0018     22 LABEL : Cell Value, String Constant - SwiLyGX len=0 
' 0018     27 LABEL : Cell Value, String Constant - uCCSVGHjdRoz len=0 
' 0018     27 LABEL : Cell Value, String Constant - uDBcVWLaMKmb len=0 
' 0018     22 LABEL : Cell Value, String Constant - uPqszne len=0 
' 0018     26 LABEL : Cell Value, String Constant - vKJDTWXXLcW len=0 
' 0018     20 LABEL : Cell Value, String Constant - zOmtv 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 LABELS
... (truncated)

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