Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 22690e9fe3097920…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:43:58 Authoring application: Microsoft Excel First seen: 2021-09-17
MD5: 03f4a21c6ec05968d867bac3fc380151 SHA-1: a7d8eef6a0771583337e7f606fac6a04f29b5748 SHA-256: 22690e9fe3097920a10115b9544bf684d25bde07aa7d2495c7f95a910ce38819
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document. The presence of dangerous formula APIs further supports this, suggesting the macro is designed to download and execute a secondary payload.

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) 6544 bytes
SHA-256: 49bfdd42c7b3b29fdb0cfe28adcc0c2e432fc048b030590ac4da33e5d0948f17
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VIhKoL
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D168 
' 0018     21 LABEL : Cell Value, String Constant - cDcoUE len=0 
' 0018     23 LABEL : Cell Value, String Constant - DKjdgvPX len=0 
' 0018     21 LABEL : Cell Value, String Constant - FAewii len=0 
' 0018     26 LABEL : Cell Value, String Constant - FlPFypAxDlj len=0 
' 0018     26 LABEL : Cell Value, String Constant - gYEnXlTVvEs len=0 
' 0018     25 LABEL : Cell Value, String Constant - hjgqVghOYt len=0 
' 0018     22 LABEL : Cell Value, String Constant - jsyVIgI len=0 
' 0018     23 LABEL : Cell Value, String Constant - JXsoHMju len=0 
' 0018     22 LABEL : Cell Value, String Constant - mLgOZuj len=0 
' 0018     20 LABEL : Cell Value, String Constant - mODxX len=0 
' 0018     20 LABEL : Cell Value, String Constant - pkkQc len=0 
' 0018     26 LABEL : Cell Value, String Constant - PrdnnFkogxM len=0 
' 0018     25 LABEL : Cell Value, String Constant - QAdYjudfDh len=0 
' 0018     26 LABEL : Cell Value, String Constant - rvbwLqrCplq len=0 
' 0018     24 LABEL : Cell Value, String Constant - seFuVaJVC len=0 
' 0018     24 LABEL : Cell Value, String Constant - WnCcQTLvB len=0 
' 0018     22 LABEL : Cell Value, String Constant - WNPaUFz len=0 
' 0018     26 LABEL : Cell Value, String Constant - xBZroRgSaLS len=0 
' 0018     27 LABEL : Cell Value, String Constant - xtoiRFUYLzyH len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZuQvMvrqABmh 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
' 00
... (truncated)

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