Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 17fdcd60a7cbb4f9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:11 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 6dee90f9ac3ec0e35f9175429de5528a SHA-1: b5b75e392117e724b2c90aaec86651f39b50a6b2 SHA-256: 17fdcd60a7cbb4f98cc887a214f62e6eeb1e13fb7bb5a29b53eb89e773833d20
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 external code. While the exact payload is not visible, 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) 6765 bytes
SHA-256: da24bb8690aac55a5d1db9ec5fa6ceb293eb174c705b7e4ac52a983e3fad9f6e
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 -  gJIQEHKA
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G188 
' 0018     22 LABEL : Cell Value, String Constant - awcHpHq len=0 
' 0018     23 LABEL : Cell Value, String Constant - DLuOXyqs len=0 
' 0018     25 LABEL : Cell Value, String Constant - dlupvvQHwp len=0 
' 0018     25 LABEL : Cell Value, String Constant - FeJtZuouJr len=0 
' 0018     26 LABEL : Cell Value, String Constant - FGikFCqlnXy len=0 
' 0018     22 LABEL : Cell Value, String Constant - hoxOvjE len=0 
' 0018     25 LABEL : Cell Value, String Constant - IPcjvMMaXf len=0 
' 0018     26 LABEL : Cell Value, String Constant - jXBqAHsmBAb len=0 
' 0018     22 LABEL : Cell Value, String Constant - KaOCfDm len=0 
' 0018     24 LABEL : Cell Value, String Constant - krXAkiXSY len=0 
' 0018     25 LABEL : Cell Value, String Constant - NueAumTsoh len=0 
' 0018     22 LABEL : Cell Value, String Constant - RRFgEIz len=0 
' 0018     20 LABEL : Cell Value, String Constant - sEUYG len=0 
' 0018     20 LABEL : Cell Value, String Constant - TJMtz len=0 
' 0018     23 LABEL : Cell Value, String Constant - vyZLvgOE len=0 
' 0018     27 LABEL : Cell Value, String Constant - yqKVokIbZrha len=0 
' 0018     27 LABEL : Cell Value, String Constant - YzKvBdnEBAoD len=0 
' 0018     22 LABEL : Cell Value, String Constant - zBJGMAN len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZbMIwfvDI len=0 
' 0018     21 LABEL : Cell Value, String Constant - zpZtzz 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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