Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e7a1e60c52a02548…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:02 Authoring application: Microsoft Excel First seen: 2021-07-02
MD5: 8ae39304c04d709bbb99abefe39d7178 SHA-1: cf569be08d36e899db635d5971d80ca4db242dda SHA-256: e7a1e60c52a0254851156a4bd2121d5fb91f4e558a0c724242b9591bcaed2dff
140 Risk Score

Malware Insights

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

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 formulas that call dangerous API functions, including 'RUN', suggesting an attempt to execute arbitrary code. While no specific URLs or further payloads were extracted, the Auto_Open macro is designed to run automatically, indicating a high likelihood of malicious intent.

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) 6761 bytes
SHA-256: b6430fe881ca0e9fb10533e65d5f4511bcac230e328bf98cf68acfd9f5c46afb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uHZdJYNw
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H156 
' 0018     27 LABEL : Cell Value, String Constant - CXtFWeSNYmCn len=0 
' 0018     24 LABEL : Cell Value, String Constant - dRyHaUbEZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - FeafLqwQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - fflELds len=0 
' 0018     23 LABEL : Cell Value, String Constant - fybmttCx len=0 
' 0018     24 LABEL : Cell Value, String Constant - GGfnAZUTd len=0 
' 0018     22 LABEL : Cell Value, String Constant - HkemMja len=0 
' 0018     24 LABEL : Cell Value, String Constant - ihOlmkOVi len=0 
' 0018     25 LABEL : Cell Value, String Constant - IllzubQLcP len=0 
' 0018     25 LABEL : Cell Value, String Constant - jijpanhSFo len=0 
' 0018     20 LABEL : Cell Value, String Constant - jNVgU len=0 
' 0018     20 LABEL : Cell Value, String Constant - lJMLM len=0 
' 0018     27 LABEL : Cell Value, String Constant - mIaIEBGgRVsC len=0 
' 0018     23 LABEL : Cell Value, String Constant - NkBEHugY len=0 
' 0018     25 LABEL : Cell Value, String Constant - oUzmytpKST len=0 
' 0018     26 LABEL : Cell Value, String Constant - pUHfVSyxLRg len=0 
' 0018     20 LABEL : Cell Value, String Constant - QpUsL len=0 
' 0018     27 LABEL : Cell Value, String Constant - RpcNgiFGXALj len=0 
' 0018     24 LABEL : Cell Value, String Constant - uFlSCowhz len=0 
' 0018     25 LABEL : Cell Value, String Constant - WgTITlXbYk 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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