Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9013842ca04048a6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:25 Authoring application: Microsoft Excel First seen: 2021-06-04
MD5: e31e11561acbeaa5847cb1c2a4cda826 SHA-1: 3a05d435df8882046e216911aa0531c5e5bac8d0 SHA-256: 9013842ca04048a63b71418a9c229021dfff8279c82c82f9551d5b878eeeb159
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, which is a common technique for executing malicious code upon opening the document. The macro sheet contains references to dangerous functions, including 'RUN', suggesting it is designed to launch an external payload. The specific nature of the payload cannot be determined from the provided evidence.

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) 6549 bytes
SHA-256: 7ec8f554ef7e6160d57ba6b97ebe586277f1e35c1918e0b07b73e2f96ae83d0f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  zOAG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E158 
' 0018     23 LABEL : Cell Value, String Constant - bHGWriWs len=0 
' 0018     20 LABEL : Cell Value, String Constant - CvOsl len=0 
' 0018     20 LABEL : Cell Value, String Constant - DzdSw len=0 
' 0018     26 LABEL : Cell Value, String Constant - geccZIuaMxG len=0 
' 0018     21 LABEL : Cell Value, String Constant - GeEKUk len=0 
' 0018     22 LABEL : Cell Value, String Constant - GorUXmT len=0 
' 0018     26 LABEL : Cell Value, String Constant - hscTJepzRmE len=0 
' 0018     21 LABEL : Cell Value, String Constant - oNaYQF len=0 
' 0018     25 LABEL : Cell Value, String Constant - orMuGJVdBL len=0 
' 0018     22 LABEL : Cell Value, String Constant - pyzLrBh len=0 
' 0018     20 LABEL : Cell Value, String Constant - qikHS len=0 
' 0018     27 LABEL : Cell Value, String Constant - QvwpmXRhIzPZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - qXmHrVzntD len=0 
' 0018     22 LABEL : Cell Value, String Constant - TTCrYML len=0 
' 0018     22 LABEL : Cell Value, String Constant - TuWNifh len=0 
' 0018     24 LABEL : Cell Value, String Constant - TWLOHIfwB len=0 
' 0018     20 LABEL : Cell Value, String Constant - VlhgP len=0 
' 0018     23 LABEL : Cell Value, String Constant - vWcFtQvs len=0 
' 0018     24 LABEL : Cell Value, String Constant - yLtlHkksv len=0 
' 0018     23 LABEL : Cell Value, String Constant - yPEndaMM 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 LABELSST : C
... (truncated)

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