Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1713e9c364d3f15c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:16 Authoring application: Microsoft Excel First seen: 2021-10-12
MD5: 09719d845f7a687c0d3dd99410d1bde8 SHA-1: b4de4faf0e21c67d126add5a410a8a14a20835b2 SHA-256: 1713e9c364d3f15c069b619389e7a775ef3e28c68ef25d8ec621433c37924a98
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel file containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The presence of an Auto_Open defined name suggests that the macro is designed to execute automatically when the workbook is opened. The specific dangerous function identified is 'RUN', which is commonly used to launch external executables or scripts. This indicates a likely attack pattern of a macro-based downloader.

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) 6693 bytes
SHA-256: 10a1d318508573a35e7c389e62941fad9e4db3e8e1c77819d64b0b37abc37dea
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 -  cKhzZGUYotn
' 0018     20 LABEL : Cell Value, String Constant - AEsnB len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A175 
' 0018     24 LABEL : Cell Value, String Constant - DajDWSxMi len=0 
' 0018     26 LABEL : Cell Value, String Constant - ebAKweIdoeD len=0 
' 0018     23 LABEL : Cell Value, String Constant - foSVumbQ len=0 
' 0018     20 LABEL : Cell Value, String Constant - ftknE len=0 
' 0018     22 LABEL : Cell Value, String Constant - gxEmeFW len=0 
' 0018     22 LABEL : Cell Value, String Constant - HaMLQGh len=0 
' 0018     25 LABEL : Cell Value, String Constant - IBRmiKUOqG len=0 
' 0018     26 LABEL : Cell Value, String Constant - KAiPOFLxjBR len=0 
' 0018     26 LABEL : Cell Value, String Constant - mdhEVKHzLHl len=0 
' 0018     24 LABEL : Cell Value, String Constant - mUuabQDLe len=0 
' 0018     25 LABEL : Cell Value, String Constant - MzGRBFIktj len=0 
' 0018     22 LABEL : Cell Value, String Constant - ObDfqkl len=0 
' 0018     22 LABEL : Cell Value, String Constant - OqYyGkn len=0 
' 0018     26 LABEL : Cell Value, String Constant - QQpeaToQJFU len=0 
' 0018     20 LABEL : Cell Value, String Constant - Uyuhs len=0 
' 0018     21 LABEL : Cell Value, String Constant - wsmpEQ len=0 
' 0018     26 LABEL : Cell Value, String Constant - XJRiHYLlKbB len=0 
' 0018     23 LABEL : Cell Value, String Constant - yAoAzleg len=0 
' 0018     25 LABEL : Cell Value, String Constant - zyciezHQvt 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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